testurlconnection.java

来自「本书是一本为Java学习者在基础内容学习结束后进行课程设计时提供参考的指导书」· Java 代码 · 共 30 行

package apibook.c5.s1;

import java.net.*;
import java.io.IOException;
import java.security.Permission;

//测试URLConnection类
public class TestURLConnection {
  public TestURLConnection() {
  }
  public static void main(String[] args) {
    try {
        URL url = new URL("http://www.163.com/index.html");
        URLConnection jc = url.openConnection();
        Permission perm = jc.getPermission();
        System.out.println("before permission: " + perm);
        //使用AccessController.checkPermission()检查访问权限

        System.out.println(url.getContent());

        perm = jc.getPermission();
        System.out.println("after permission: " + perm);
    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
  }

}