99 lines
3.1 KiB
Java
99 lines
3.1 KiB
Java
package com.xwbing.demo;
|
||
|
||
import java.io.*;
|
||
|
||
/**
|
||
* 创建日期: 2017年2月21日 上午10:12:20
|
||
* 作者: xiangwb
|
||
*/
|
||
|
||
public class IODemo {
|
||
public static void main(String[] args) throws Exception {
|
||
/**
|
||
* GBK：国标编码，中文占2字节
|
||
* UTF-8：unicode的子集，其中文占3个字节
|
||
* ISO8859-1：欧洲编码集，不支持中文
|
||
*/
|
||
|
||
/**
|
||
* 写
|
||
*/
|
||
FileOutputStream fos = new FileOutputStream("fos.txt", true);//追加写模式
|
||
fos.write("你好".getBytes("gbk"));
|
||
System.out.println("写出完毕");
|
||
fos.close();//关闭流
|
||
|
||
/**
|
||
* 读
|
||
*/
|
||
FileInputStream fis = new FileInputStream("fos.txt");
|
||
byte[] data = new byte[fis.available()];
|
||
int len = fis.read(data);//数据读入data里
|
||
String str = new String(data, 0, len, "gbk");
|
||
fis.close();
|
||
|
||
InputStream is = new ByteArrayInputStream(str.getBytes("gbk"));
|
||
byte[] da = new byte[is.available()];
|
||
is.read(da);
|
||
is.close();
|
||
/**
|
||
* 缓冲流
|
||
*
|
||
*/
|
||
BufferedOutputStream bos = new BufferedOutputStream(fos);
|
||
bos.write("你好".getBytes());
|
||
bos.close();//close前会自动flush，关流只需管最外层高级流
|
||
|
||
/**
|
||
* 使用缓冲流的形式复制文件
|
||
*/
|
||
BufferedInputStream bis1 = new BufferedInputStream(fis);
|
||
BufferedOutputStream bos1 = new BufferedOutputStream(fos);
|
||
int d ;
|
||
while ((d = bis1.read()) != -1) {
|
||
bos1.write(d);
|
||
}
|
||
bis1.close();
|
||
bos1.close();
|
||
|
||
/*
|
||
* 字符流
|
||
* 读写单位是字符
|
||
* 可以按照指定的字符集，将写出的字符转换为对应的字节
|
||
* 字符流只适合读写文本数据
|
||
* 转码
|
||
*uft-8转gbk
|
||
*/
|
||
InputStreamReader isr = new InputStreamReader(fis, "utf-8");
|
||
OutputStreamWriter osw = new OutputStreamWriter(fos, "gbk");
|
||
int leng;
|
||
while ((leng = isr.read()) != -1) {
|
||
osw.write(leng);
|
||
}
|
||
osw.close();
|
||
isr.close();
|
||
|
||
/**
|
||
* 缓冲字符输入流，特点：读取速度快，并且可以按行读取字符串
|
||
*/
|
||
BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream("fis.txt")));
|
||
String line = null;
|
||
//readerLIne():连续读取若干字符，知道遇到换行符为止,该字符串中不包含换行符
|
||
while ((line = br.readLine()) != null) {
|
||
//TODO
|
||
}
|
||
br.close();
|
||
|
||
/**
|
||
* 缓冲字符输出流
|
||
*/
|
||
PrintWriter pw = new PrintWriter("e.txt", "utf-8");//PrintWriter可以直接创建基于文件进行写操作
|
||
|
||
FileOutputStream fos1 = new FileOutputStream("pw1.txt");
|
||
OutputStreamWriter osw1 = new OutputStreamWriter(fos, "utf-8");//可以指定字符
|
||
PrintWriter pw1 = new PrintWriter(osw, true);///////当第一个参数为流，可以使用第二个参数来指定是否自动flush
|
||
pw1.println("......");
|
||
pw1.close();
|
||
}
|
||
}
|