package com.xiaopeng.trafficControl.util;
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import java.io.*;
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import java.lang.reflect.Method;
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import java.net.URL;
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/**
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* 资源工具类
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* @author binghuoliu
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*
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*/
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public class ResourceUtil {
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/**
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* 读取classpath下的文件<br>
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* 读取classpath下的文件 一般用于读取classpath下的配置文件,注意读取的配置文件路径是相对传入参数clazz的load入路径. 例：<br>
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* ClassTest c1;//假设c1是从/usr/local/classpath/ 载入<br>
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* ClassTest c2;//假设c2是从/home/classpath/ 载入<br>
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* ............<br>
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* loadConfigFile("a.xml",c1.class);//从/usr/local/classpath1/下寻找a.xml<br>
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* loadConfigFile("a.xml",c2.class);//从/home/classpath/下寻找a.xml<br>
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* @param resource 资源路径
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* @param clazz
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* @return InputStream 文件的inputstram,如果找不到则返回null
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*/
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@SuppressWarnings("unchecked")
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public static InputStream loadConfigFile(String resource, Class clazz) {
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ClassLoader classLoader = null;
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try {
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Method method = Thread.class.getMethod("getContextClassLoader");
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classLoader = (ClassLoader) method.invoke(Thread.currentThread());
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} catch (Exception e) {
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throw new RuntimeException("loadConfigFile error: ", e);
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}
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if (classLoader == null) {
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classLoader = clazz.getClassLoader();
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}
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try {
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if (classLoader != null) {
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URL url = classLoader.getResource(resource);
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if (url == null) {
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System.out.println("Can not find resource:" + resource);
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return null;
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}
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if (url.toString().startsWith("jar:file:")) {
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System.out.println("Get resource \"" + resource + "\" from jar:\t" + url.toString());
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return clazz.getResourceAsStream(resource.startsWith("/") ? resource : "/" + resource);
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} else {
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System.out.println("Get resource \"" + resource + "\" from:\t" + url.toString());
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return new FileInputStream(new File(url.toURI()));
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}
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}
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} catch (Exception e) {
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throw new RuntimeException("loadConfigFile error: ", e);
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}
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return null;
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}
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/**
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* 释放资源（有异常抛出）
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* @param closeable
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* @throws IOException
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*/
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public static void close(Closeable closeable) throws IOException {
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if (closeable != null) {
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closeable.close();
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}
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}
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/**
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* 以优雅的形式释放资源（内部吃掉了异常）
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* @param closeable
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*/
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public static void closeGracefully(Closeable closeable) {
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if (closeable != null) {
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try {
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closeable.close();
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} catch (IOException e) {
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}
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}
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}
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}
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