openurl.java

通过URL下载网页

package agree;
import java.net.*;
import java.io.*;

public class OpenUrl
{
 public String getContent(String strUrl)
 // 一个public方法，返回字符串，错误则返回"error open url"
 {
  try{
   
   URL url=new URL(strUrl);
   BufferedReader br=new BufferedReader(new InputStreamReader(url.openStream()));
   String s="";
   StringBuffer sb=new StringBuffer("");
   while((s=br.readLine())!=null)            //一个一个读br，br空时结束
   {     
    sb.append(s+"\r\n");    
   }
   br.close();
   return sb.toString();
  }
  catch(Exception e){
   return "error open url" + strUrl;
   
  }  
 }
 
 public static void main(String args[])
 {
  //具体使用方法
  OpenUrl ou=new OpenUrl();
  System.out.println(ou.getContent("http://www.google.com"));         
 }
 
}