jar中类的装载及jar中资源文件的读取

package com.chb;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;

//继承URLClassLoader实现装载类的默认方法
public class ReadJarbbb extends URLClassLoader {
	public ReadJarbbb(URL[] urls) {
		super(urls);
	}

	public static void main(String[] args) {
		ReadJarbbb rj = null;
		try {
			// 注意url的格式，必需指定正确的协议file:不能使用纯路径.
			URL url = new URL(
					"file:C:/Users/Administrator/Desktop/SourceJarFile.jar");
			rj = new ReadJarbbb(new URL[] { url });

			// 反映出其中的类.
			Class c = rj.findClass("com.chb.UserInfo");
			System.out.println(c);
			// 利用类进行jar文件中的资源的读取
			InputStream in = c.getResourceAsStream("/file.txt");
			byte[] bs = new byte[4096];
			int length = -1;
			while ((length = in.read(bs, 0, 4096)) != -1) {
				System.out.println(new String(bs, 0, length));
			}
			in.close();
		} catch (MalformedURLException e2) {
			e2.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
	}
}

// 这里不能传附件....

// 下面图片后缀。。。，你懂的.

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