Java中URL的使用

/**
*
*/
package com.duoguo.url;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

/**
* @author shyboy([e-mail])
*
*/
public class URLClient {

StringBuilder sb = new StringBuilder();

/**
* 连接到服务器，并请求给定的文档
*
* @param urlString
* ：文档地址
* @return：String
*/
public String getDocumentAt(String urlString) {

try {

URL url = new URL(urlString);// 生成url对象

URLConnection urlConnection = url.openConnection();// 打开url连接

BufferedReader br = new BufferedReader(new InputStreamReader(
urlConnection.getInputStream()));

String line = null;
while ((line = br.readLine()) != null) {
sb.append(line + "\n");
}

} catch (MalformedURLException e) {

System.out.println("不能连接到URL：" + urlString);
e.printStackTrace();

} catch (IOException e) {

System.out.println("连接到URL抛出异常信息：" + urlString);
e.printStackTrace();

}

return sb.toString();

}

/**
* @param args
*/
public static void main(String[] args) {

URLClient client = new URLClient();

String url = client.getDocumentAt("http://www.baidu.com");

System.out.println(url);

}

}