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仿照ibatis的风格实现Log，以及添加ConnectionChecker
git-svn-id: http://code.alibabatech.com/svn/druid/trunk@292 b9813039-fb51-4c41-a8b9-e21c2acb5095
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wenshao
@@ -0,0 +1,308 @@
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package com.alibaba.druid.logging;
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import java.io.*;
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import java.net.URL;
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import java.net.URLConnection;
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import java.nio.charset.Charset;
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import java.util.Properties;
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/**
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* A class to simplify access to resources through the classloader.
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*/
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public class Resources extends Object {
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private static ClassLoader defaultClassLoader;
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/**
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* Charset to use when calling getResourceAsReader.
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* null means use the system default.
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*/
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private static Charset charset;
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private Resources() {
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}
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/**
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* Returns the default classloader (may be null).
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*
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* @return The default classloader
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*/
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public static ClassLoader getDefaultClassLoader() {
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return defaultClassLoader;
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}
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/**
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* Sets the default classloader
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*
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* @param defaultClassLoader - the new default ClassLoader
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*/
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public static void setDefaultClassLoader(ClassLoader defaultClassLoader) {
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Resources.defaultClassLoader = defaultClassLoader;
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}
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/**
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* Returns the URL of the resource on the classpath
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*
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* @param resource The resource to find
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* @return The resource
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* @throws IOException If the resource cannot be found or read
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*/
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public static URL getResourceURL(String resource) throws IOException {
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return getResourceURL(getClassLoader(), resource);
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}
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/**
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* Returns the URL of the resource on the classpath
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*
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* @param loader The classloader used to load the resource
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* @param resource The resource to find
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* @return The resource
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* @throws IOException If the resource cannot be found or read
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*/
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public static URL getResourceURL(ClassLoader loader, String resource) throws IOException {
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URL url = null;
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if (loader != null) url = loader.getResource(resource);
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if (url == null) url = ClassLoader.getSystemResource(resource);
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if (url == null) throw new IOException("Could not find resource " + resource);
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return url;
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}
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/**
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* Returns a resource on the classpath as a Stream object
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*
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* @param resource The resource to find
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* @return The resource
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* @throws IOException If the resource cannot be found or read
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*/
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public static InputStream getResourceAsStream(String resource) throws IOException {
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return getResourceAsStream(getClassLoader(), resource);
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}
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/**
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* Returns a resource on the classpath as a Stream object
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*
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* @param loader The classloader used to load the resource
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* @param resource The resource to find
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* @return The resource
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* @throws IOException If the resource cannot be found or read
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*/
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public static InputStream getResourceAsStream(ClassLoader loader, String resource) throws IOException {
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InputStream in = null;
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if (loader != null) in = loader.getResourceAsStream(resource);
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if (in == null) in = ClassLoader.getSystemResourceAsStream(resource);
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if (in == null) throw new IOException("Could not find resource " + resource);
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return in;
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}
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/**
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* Returns a resource on the classpath as a Properties object
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*
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* @param resource The resource to find
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* @return The resource
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* @throws IOException If the resource cannot be found or read
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*/
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public static Properties getResourceAsProperties(String resource)
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throws IOException {
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Properties props = new Properties();
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InputStream in = null;
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String propfile = resource;
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in = getResourceAsStream(propfile);
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props.load(in);
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in.close();
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return props;
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}
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/**
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* Returns a resource on the classpath as a Properties object
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*
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* @param loader The classloader used to load the resource
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* @param resource The resource to find
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* @return The resource
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* @throws IOException If the resource cannot be found or read
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*/
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public static Properties getResourceAsProperties(ClassLoader loader, String resource)
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throws IOException {
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Properties props = new Properties();
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InputStream in = null;
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String propfile = resource;
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in = getResourceAsStream(loader, propfile);
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props.load(in);
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in.close();
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return props;
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}
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/**
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* Returns a resource on the classpath as a Reader object
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*
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* @param resource The resource to find
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* @return The resource
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* @throws IOException If the resource cannot be found or read
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*/
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public static Reader getResourceAsReader(String resource) throws IOException {
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Reader reader;
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if (charset == null) {
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reader = new InputStreamReader(getResourceAsStream(resource));
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} else {
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reader = new InputStreamReader(getResourceAsStream(resource), charset);
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}
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return reader;
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}
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/**
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* Returns a resource on the classpath as a Reader object
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*
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* @param loader The classloader used to load the resource
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* @param resource The resource to find
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* @return The resource
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* @throws IOException If the resource cannot be found or read
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*/
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public static Reader getResourceAsReader(ClassLoader loader, String resource) throws IOException {
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Reader reader;
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if (charset == null) {
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reader = new InputStreamReader(getResourceAsStream(loader, resource));
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} else {
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reader = new InputStreamReader(getResourceAsStream(loader, resource), charset);
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}
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return reader;
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}
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/**
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* Returns a resource on the classpath as a File object
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*
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* @param resource The resource to find
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* @return The resource
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* @throws IOException If the resource cannot be found or read
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*/
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public static File getResourceAsFile(String resource) throws IOException {
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return new File(getResourceURL(resource).getFile());
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}
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/**
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* Returns a resource on the classpath as a File object
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*
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* @param loader - the classloader used to load the resource
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* @param resource - the resource to find
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* @return The resource
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* @throws IOException If the resource cannot be found or read
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*/
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public static File getResourceAsFile(ClassLoader loader, String resource) throws IOException {
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return new File(getResourceURL(loader, resource).getFile());
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}
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/**
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* Gets a URL as an input stream
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*
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* @param urlString - the URL to get
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* @return An input stream with the data from the URL
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* @throws IOException If the resource cannot be found or read
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*/
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public static InputStream getUrlAsStream(String urlString) throws IOException {
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URL url = new URL(urlString);
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URLConnection conn = url.openConnection();
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return conn.getInputStream();
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}
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/**
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* Gets a URL as a Reader
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*
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* @param urlString - the URL to get
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* @return A Reader with the data from the URL
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* @throws IOException If the resource cannot be found or read
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*/
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public static Reader getUrlAsReader(String urlString) throws IOException {
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return new InputStreamReader(getUrlAsStream(urlString));
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}
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/**
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* Gets a URL as a Properties object
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*
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* @param urlString - the URL to get
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* @return A Properties object with the data from the URL
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* @throws IOException If the resource cannot be found or read
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*/
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public static Properties getUrlAsProperties(String urlString) throws IOException {
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Properties props = new Properties();
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InputStream in = null;
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String propfile = urlString;
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in = getUrlAsStream(propfile);
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props.load(in);
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in.close();
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return props;
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}
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/**
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* Loads a class
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*
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* @param className - the class to load
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* @return The loaded class
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* @throws ClassNotFoundException If the class cannot be found (duh!)
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*/
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public static Class classForName(String className) throws ClassNotFoundException {
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Class clazz = null;
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try {
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clazz = getClassLoader().loadClass(className);
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} catch (Exception e) {
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// Ignore. Failsafe below.
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}
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if (clazz == null) {
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clazz = Class.forName(className);
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}
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return clazz;
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}
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/**
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* Creates an instance of a class
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*
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* @param className - the class to create
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* @return An instance of the class
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* @throws ClassNotFoundException If the class cannot be found (duh!)
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* @throws InstantiationException If the class cannot be instantiaed
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* @throws IllegalAccessException If the class is not public, or other access problems arise
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*/
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public static Object instantiate(String className)
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throws ClassNotFoundException, InstantiationException, IllegalAccessException {
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return instantiate(classForName(className));
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}
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/**
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* Creates an instance of a class
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*
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* @param clazz - the class to create
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* @return An instance of the class
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* @throws InstantiationException If the class cannot be instantiaed
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* @throws IllegalAccessException If the class is not public, or other access problems arise
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*/
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public static Object instantiate(Class clazz)
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throws InstantiationException, IllegalAccessException {
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return clazz.newInstance();
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}
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private static ClassLoader getClassLoader() {
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if (defaultClassLoader != null) {
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return defaultClassLoader;
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} else {
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return Thread.currentThread().getContextClassLoader();
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}
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}
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public static Charset getCharset() {
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return charset;
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}
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/**
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* Use this method to set the Charset to be used when
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* calling the getResourceAsReader methods. This will
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* allow iBATIS to function properly when the system default
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* encoding doesn't deal well with unicode (IBATIS-340, IBATIS-349)
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*
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* @param charset
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*/
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public static void setCharset(Charset charset) {
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Resources.charset = charset;
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}
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}
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