java 403_java http 返回403 怎么解决？

importjava.net.*;importjava.io.*;publicclassA{publicstaticvoidmain(String[]arg){StringurlString="http://www.sina.com/";//网址HttpURLConnectionurl_con;Stringtext="";//网页...

import java.net.*;

import java.io.*;

public class A{

public static void main(String[] arg){

String urlString="http://www.sina.com/";//网址

HttpURLConnection url_con;

String text="";//网页源文件

URL url;

try{

for (int i=0; i<1; i++){

url=new URL(urlString);

url_con=(HttpURLConnection)url.openConnection();

url_con.setDoOutput(true);

url_con.setRequestMethod("GET");

url_con.getOutputStream().flush();

url_con.getOutputStream().close();

InputStream in=url_con.getInputStream();

BufferedReader rd= new BufferedReader(new InputStreamReader(in));

while(rd.read()!=-1){

text.concat(rd.readLine());

}

}

System.out.println(text);

}

catch(Exception e){

try{ System.out.println("exception occur"+e.toString());}

catch(Exception ex){}

}

}

}

运行结果：

java.io.IOException:Server returned HTTP response code: 403 for URL: http://www.sina.com/

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