Java HTTP请求

import java.io.*;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.zip.GZIPInputStream;
public class testHTTP {
    public static void main(String[] args) throws IOException
    {
        try 
        {
            URL url = new URL("http://zhidao.baidu.com/ ");
            URLConnection conn = url.openConnection();
            HttpURLConnection httpURLConnection = (HttpURLConnection)conn;
            httpURLConnection.setRequestProperty("Host", "zhidao.baidu.com");
            httpURLConnection.setRequestProperty("connection", "Keep-Alive");
            httpURLConnection.setRequestProperty("Cache-Control", "max-age=0");
            httpURLConnection.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");
            httpURLConnection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36 SE 2.X MetaSr 1.0");
            httpURLConnection.setRequestProperty("Referer", "https://www.baidu.com/link?url=BHPFr4z5_jfNStMOzkornuMJSmwj_2dOif9q8Ivqw9Rw8xPahOvXdFJKgKpSSpiYGhynort7ziken5eO1Q207a&wd=&eqid=a08f92f0000022f80000000355eece3b");
            //关键是下面这句话   这句话的意思是浏览器支持的解压缩方式  如果发送这个报头，那么服务器返回的就可能是以某种方式压缩后的信息
            //httpURLConnection.setRequestProperty("Accept-Encoding", "gzip");
            httpURLConnection.setRequestProperty("Accept-Language", "zh-CN,zh;q=0.8");
            
            httpURLConnection.setRequestProperty("Cookie", "BAIDUID=93F317FBB6B90290B30A5C8521ADF385:FG=1; PSTM=1441426636; BIDUPSID=F3BB3C015AB71995F023187B9424234B; bdshare_firstime=1441714095462; BDRCVFR[Zln_T-KFICf]=pdg3iqubLhtTvqMULR8mvqV; H_PS_PSSID=1431_13477_12868_17104_16935_17004_15648_11513_13932_16969_17051; IK_93F317FBB6B90290B30A5C8521ADF385=4; IK_CID_74=4; Hm_lvt_6859ce5aaf00fb00387e6434e4fcc925=1441714095,1441714137,1441714225,1441715740; Hm_lpvt_6859ce5aaf00fb00387e6434e4fcc925=1441717326");
            
            conn.setDoOutput(true);
            conn.setDoInput(true);
            
            String result = "";
            BufferedReader in = null;
            PrintWriter out = null;
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            //out.print(param);
            // flush输出流的缓冲
            out.flush();
            //GBK与UTF-8 是传输过程中常用的两种编码方式
            in = new BufferedReader(new InputStreamReader(conn.getInputStream(),"GBK"));
            String line;
            while ((line = in.readLine()) != null) 
            {
                result += line;
            }
            
            System.out.println(result);
            
        } 
        catch (MalformedURLException e) 
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
     
    
}

关键点有二：第一发送的时候不要发送 httpURLConnection.setRequestProperty("Accept-Encoding", "gzip");  这个报头，否则接受到的则是以gzip方式压缩后的数据

　　　　　　第二时用的inputstream  注意编码方式