Google Guava 库用法整理
This commit is contained in:
sxyx2008
@@ -78,5 +78,13 @@
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<artifactId>junit</artifactId>
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<version>4.11</version>
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</dependency>
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<!-- google guava库介绍 -->
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<dependency>
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<groupId>com.google.guava</groupId>
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<artifactId>guava</artifactId>
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<version>17.0</version>
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</dependency>
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</dependencies>
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</project>
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@@ -0,0 +1,533 @@
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package org.javase.tutorials.guava;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileReader;
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import java.io.FileWriter;
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import java.io.IOException;
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import java.io.StringWriter;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import org.junit.Test;
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import com.google.common.base.CharMatcher;
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import com.google.common.base.Charsets;
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import com.google.common.base.Joiner;
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import com.google.common.base.Splitter;
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import com.google.common.collect.ImmutableList;
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import com.google.common.collect.ImmutableMap;
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import com.google.common.collect.ImmutableSet;
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import com.google.common.collect.Lists;
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import com.google.common.collect.MapDifference;
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import com.google.common.collect.MapDifference.ValueDifference;
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import com.google.common.collect.Maps;
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import com.google.common.collect.Sets;
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import com.google.common.collect.Sets.SetView;
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import com.google.common.io.ByteStreams;
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import com.google.common.io.CharStreams;
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import com.google.common.io.Files;
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import com.google.common.io.LineReader;
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import com.google.common.primitives.Ints;
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/**
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* Google Guava工具类
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*
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* @author 冯靖
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*
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*/
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public class GuavaTutorial {
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@Test
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public void example1() {
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// Map<String, Map<Long, List<String>>> map1 = new HashMap<String,
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// Map<Long,List<String>>>();
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ImmutableList<String> list = ImmutableList.of("小米2", "小米2S", "小米2A",
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"小米3");
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// 声明Map<String, Map<Long, List<String>>>
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// Map<String, Map<Long, List<String>>> map2 = Maps.newHashMap();
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// 赋值
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ImmutableMap<Long, List<String>> mp = ImmutableMap.of(1999l,
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(List<String>) list);
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System.out
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.println("-----------Map<String, Map<Long, List<String>>>---------");
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Set<Long> keySet = mp.keySet();
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for (Long log : keySet) {
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System.out.println("key:" + log);
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List<String> lt = mp.get(log);
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for (String string : lt) {
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System.out.println(string);
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}
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}
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// 声明List<Map<Long, List<String>>>
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// List<Map<Long, List<String>>> list = Lists.newArrayList();
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// 赋值
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ImmutableList<Map<Long, List<String>>> lst = ImmutableList
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.of((Map<Long, List<String>>) mp);
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System.out.println("-----------List<Map<Long, List<String>>>---------");
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for (Map<Long, List<String>> map : lst) {
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Set<Long> key = map.keySet();
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for (Long log : key) {
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System.out.println("key:" + log);
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List<String> lt = map.get(log);
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for (String string : lt) {
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System.out.println(string);
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}
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}
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}
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// 声明Set<Map<Long, List<String>>>
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// Set<Map<Long, List<String>>> sets = Sets.newHashSet();
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// 赋值
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ImmutableSet<Map<Long, List<String>>> st = ImmutableSet
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.of((Map<Long, List<String>>) mp);
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System.out.println("-----------Set<Map<Long, List<String>>>---------");
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for (Map<Long, List<String>> map : st) {
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Set<Long> key = map.keySet();
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for (Long log : key) {
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System.out.println("key:" + log);
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List<String> lt = map.get(log);
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for (String string : lt) {
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System.out.println(string);
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}
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}
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}
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}
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@Test
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public void example2() {
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List<String> list = new ArrayList<String>();
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list.add("a");
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list.add("b");
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list.add("c");
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list.add("d");
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// 直接为List赋值
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ImmutableList<String> of = ImmutableList.of("a", "b", "c", "d");
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for (String string : of) {
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System.out.println(string);
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}
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// 直接为Map赋值
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ImmutableMap<String, String> map = ImmutableMap.of("key1", "value1",
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"key2", "value2");
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System.out.println("-----------------------------------");
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ImmutableSet<String> keySet = map.keySet();
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for (String string : keySet) {
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System.out.println(string + ":" + map.get(string));
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}
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// 直接为Set赋值
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ImmutableSet<String> set = ImmutableSet.of("a", "b", "c", "d");
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System.out.println("-----------------------------------");
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for (String string : set) {
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System.out.println(string);
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}
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}
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@Test
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public void example3() {
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File file = new File("src/main/resources/sample.txt");
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List<String> lines = null;
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try {
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lines = Files.readLines(file, Charsets.UTF_8);
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for (String string : lines) {
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System.out.println(string);
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}
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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@Test
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public void example4() throws Exception{
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File file = new File("src/main/resources/sample.txt");
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List<String> lines = CharStreams.readLines(new FileReader(file));
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for (String string : lines) {
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System.out.println(string);
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}
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}
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@Test
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public void example5() throws Exception{
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File file = new File("src/main/resources/sample.txt");
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//读取内容到字符串中
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String string = CharStreams.toString(new FileReader(file));
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System.out.println(string);
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}
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/**
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* 使用LineReader
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* @throws Exception
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*/
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@Test
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public void example6() throws Exception{
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File file = new File("src/main/resources/sample.txt");
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LineReader lineReader = new LineReader(new FileReader(file));
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for(String line = lineReader.readLine();line!=null;line=lineReader.readLine()){
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System.out.println(line);
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}
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}
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/**
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* 将读取的内容拷贝到一个writer中去
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* @throws Exception
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*/
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@Test
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public void example7() throws Exception{
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File file = new File("src/main/resources/sample.txt");
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StringWriter writer = new StringWriter();
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FileWriter fileWriter = new FileWriter(new File("src/main/resources/sample-copy.txt"));
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CharStreams.copy(new FileReader(file), fileWriter);//写文件
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fileWriter.flush();
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fileWriter.close();
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System.out.println(writer.toString());
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}
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@Test
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public void example8() throws Exception{
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File file = new File("src/main/resources/sample.txt");
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String string = new String(ByteStreams.toByteArray(new FileInputStream(file)));
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System.out.println(string);
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}
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@Test
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public void example9() throws Exception{
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File file = new File("src/main/resources/sample.txt");
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//将文件输入流拷贝到PrintStream输出
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ByteStreams.copy(new FileInputStream(file), System.out);
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}
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/**
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* 基本数据类型大小比较
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*/
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@Test
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public void example10(){
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int compare = Ints.compare(10, 59);// (a < b) ? -1 : ((a > b) ? 1 : 0)
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System.out.println(compare);
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}
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/**
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* 将List<Integer>转化为int[]
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*/
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@Test
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public void example11(){
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List<Integer> list = Lists.newArrayList(1, 2, 3, 4);
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int[] is = Ints.toArray(list);
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for (int i : is) {
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System.out.println(i);
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}
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}
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@Test
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public void example12() throws Exception{
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File file = new File("src/main/resources/sample.txt");
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System.out.println(Files.toString(file, Charsets.UTF_8));
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}
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@Test
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public void example13() throws Exception{
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File file = new File("src/main/resources/sample.txt");
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System.out.println(new String(Files.toByteArray(file)));
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}
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@Test
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public void example14() throws Exception{
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File file = new File("src/main/resources/sample.txt");
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Files.write(Files.toString(file, Charsets.UTF_8), new File("src/main/resources/sample-copy.txt"), Charsets.UTF_8);
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}
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@Test
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public void example15() throws Exception{
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File file = new File("src/main/resources/sample.txt");
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Files.copy(file, System.out);
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}
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@Test
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public void example16(){
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System.out.println(CharMatcher.DIGIT.retainFrom("some text 89983 and more"));//返回数字部分内容
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System.out.println(CharMatcher.DIGIT.removeFrom("some text 89983 and more"));//去除数字
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System.out.println(CharMatcher.DIGIT.replaceFrom("some text 89983 and more","#"));//将数字替换为#
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}
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/**
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* 连接
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*/
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@Test
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public void example17(){
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int[] numbers = { 1, 2, 3, 4, 5 };
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String numbersAsString = Joiner.on(";").join(Ints.asList(numbers));
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System.out.println(numbersAsString);
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String numbersAsStringDirectly = Ints.join(";", numbers);
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System.out.println(numbersAsStringDirectly);
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}
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/**
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* 字符串分割
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*/
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@Test
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public void example18(){
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String numbsAsString = "1,2,3,4,5";
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Iterable<String> split = Splitter.on(",").split(numbsAsString);
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for (String object : split) {
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System.out.println(object);
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}
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}
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/**
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* 字符串分割
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*/
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@Test
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public void example19(){
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String testString = "foo , what,,,more,";
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Iterable<String> split = Splitter.on(",").omitEmptyStrings().trimResults().split(testString);
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for (String object : split) {
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System.out.println(object);
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}
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}
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@Test
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public void example20(){
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int[] array1 = { 1, 2, 3, 4, 5 };
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int a = 4;
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boolean contains = Ints.contains(array1, a);//判断数组中是否存在a元素
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System.out.println(contains);
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int indexOf = Ints.indexOf(array1, a); //获取该元素在数组中的下标
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System.out.println(indexOf);
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int max = Ints.max(array1);//求数组中的最大值
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System.out.println(max);
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int min = Ints.min(array1);//求数组中的最小值
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System.out.println(min);
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int[] array2 = {6, 7, 8, 9, 10};
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int[] concat = Ints.concat(array1, array2 );//合并数组
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System.out.println(Arrays.toString(concat));
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}
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/**
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* Set的交集, 并集, 差集的用法
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*/
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@Test
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public void example21(){
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HashSet<Integer> setA = Sets.newHashSet(1, 2, 3, 4, 5);
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HashSet<Integer> setB = Sets.newHashSet(4, 5, 6, 7, 8);
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SetView<Integer> union = Sets.union(setA, setB);//取并集
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System.out.println("并集union:");
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for (Integer integer : union){
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System.out.println(integer);
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}
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SetView<Integer> difference = Sets.difference(setA, setB);//取差集 (所有属于A不属于B的元素构成的集合)
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System.out.println("差集 difference:");
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for (Integer integer : difference){
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System.out.println(integer);
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}
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SetView<Integer> intersection = Sets.intersection(setA, setB);//取交集
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System.out.println("交集intersection:");
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for (Integer integer : intersection){
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System.out.println(integer);
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}
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}
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@Test
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public void example22(){
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Map<Integer,String> mapA = ImmutableMap.of(123, "Jack Johnson", 456, "Cindy Lewis", 789, "Terry Peters", 912, "Ethan Nicks", 234, "Sarah Perry");
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Map<Integer,String> mapB = ImmutableMap.of(123, "Jack Johnson", 478, "Patrick Ewig", 789, "Cindy Peters", 937, "Jon Lund", 234, "Sarah Perry");
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MapDifference<Integer,String> differenceMap = Maps.difference(mapA, mapB);
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System.out.println("判断两个Map是否相同:"+differenceMap.areEqual());
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System.out.println("-------------------------------------------------");
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Map<Integer,ValueDifference<String>> entriesDiffering = differenceMap.entriesDiffering();
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System.out.println("键相同,值不同:"+Arrays.toString(entriesDiffering.keySet().toArray()));
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Map<Integer,String> entriesOnlyOnLeft = differenceMap.entriesOnlyOnLeft();
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Set<Integer> keySet = entriesOnlyOnLeft.keySet();
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System.out.println("------------------------entriesOnlyOnLeft-------------------------");
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for (Integer integer : keySet) {
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System.out.println(integer+":"+entriesOnlyOnLeft.get(integer));
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}
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System.out.println("------------------------entriesOnlyOnRight-------------------------");
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Map<Integer,String> entriesOnlyOnRight = differenceMap.entriesOnlyOnRight();
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keySet = entriesOnlyOnRight.keySet();
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for (Integer integer : keySet) {
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System.out.println(integer+":"+entriesOnlyOnRight.get(integer));
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}
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System.out.println("-------------------------entriesInCommon------------------------");
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Map<Integer,String> entriesInCommon = differenceMap.entriesInCommon();//取两个map中键值都相同的元素
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keySet = entriesInCommon.keySet();
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for (Integer integer : keySet) {
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System.out.println(integer+":"+entriesInCommon.get(integer));
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}
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}
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@Test
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public void example23(){
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}
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@Test
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public void example24(){
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}
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@Test
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public void example25(){
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}
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@Test
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public void example26(){
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}
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@Test
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public void example27(){
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}
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@Test
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public void example28(){
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}
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@Test
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public void example29(){
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}
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@Test
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public void example30(){
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}
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@Test
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public void example31(){
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}
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@Test
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public void example32(){
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}
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@Test
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public void example33(){
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}
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@Test
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public void example34(){
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}
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@Test
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public void example35(){
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}
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@Test
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public void example36(){
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}
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@Test
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public void example37(){
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||||
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}
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@Test
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public void example38(){
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||||
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||||
}
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@Test
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public void example39(){
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||||
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}
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||||
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@Test
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||||
public void example40(){
|
||||
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||||
}
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||||
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@Test
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public void example41(){
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||||
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||||
}
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||||
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||||
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|
||||
}
|
||||
@@ -0,0 +1,51 @@
|
||||
ZIP4J 是一个支持处理ZIP文件的开源库
|
||||
支持创建，修改，添加，删除，解压 压缩文件
|
||||
支持读/写密码保护
|
||||
支持AES加密 128/256
|
||||
支持标准ZIP加密
|
||||
支持进度监视器
|
||||
自持Unicode 文件名
|
||||
支持创建分卷压缩文件
|
||||
支持将文件添加到压缩包中但不进行压缩
|
||||
|
||||
|
||||
Create, Add, Extract, Update, Remove files from a Zip file
|
||||
针对ZIP压缩文件创建、添加、抽出、更新和移除文件
|
||||
Read/Write password protected Zip files
|
||||
(读写有密码保护的Zip文件)
|
||||
Supports AES 128/256 Encryption
|
||||
(支持AES 128/256算法加密)
|
||||
Supports Standard Zip Encryption
|
||||
(支持标准Zip算法加密)
|
||||
Supports Zip64 format
|
||||
(支持zip64格式)
|
||||
Supports Store (No Compression) and Deflate compression method
|
||||
(支持Store(非压缩)和Deflate压缩方法---不太明白)
|
||||
Create or extract files from Split Zip files (Ex: z01, z02,...zip)
|
||||
(针对分块zip文件创建和抽出文件)
|
||||
Supports Unicode file names
|
||||
(支持Unicode编码文件名)
|
||||
Progress Monitor
|
||||
(进度监控)
|
||||
|
||||
压缩效率
|
||||
|
||||
ZIP4J提供5中压缩算法：
|
||||
|
||||
DEFLATE_LEVEL_FASTEST
|
||||
DEFLATE_LEVEL_FASTEST
|
||||
DEFLATE_LEVEL_NORMAL
|
||||
DEFLATE_LEVEL_MAXIMUM
|
||||
DEFLATE_LEVEL_ULTRA
|
||||
根据API提供的几种不同压缩级别进行测试（文件夹压缩），测试结果如下：
|
||||
|
||||
一个180M的文件夹压缩后
|
||||
|
||||
WinRAR 30秒 - 78.7 MB ；
|
||||
NORMAL - 18 秒 91.2 MB ；
|
||||
FAST 13秒 -93.1 MB；
|
||||
FASTEST - 最快速10 秒94.7 MB
|
||||
MAXIMUM 23 秒 - 90.7 MB；
|
||||
ULTRA -50 90.6 MB
|
||||
|
||||
ZIP4J 项目地址为 ：http://www.lingala.net/zip4j/
|
||||
Reference in New Issue
Block a user