一次性简单记住jar中类的装载及资源文件的读取

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.