javaHTTP 요청 도구 클래스 - HttpURLConnection 사용

package zmx.util;

import java.io.BufferedReader;  
import java.io.IOException;
import java.io.InputStream;  
import java.io.InputStreamReader;  
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;  
import java.net.HttpURLConnection;  
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.URL; 
import java.net.URLConnection;
import java.util.List;
import java.util.Map;
 
/** 
 * Http      
 * 
 */
public class HttpRequestUtil {
    static boolean proxySet = false;
    static String proxyHost = "127.0.0.1";
    static int proxyPort = 8087;
    /** 
     *    
     * @param source 
     * @return 
     */ 
    public static String urlEncode(String source,String encode) {  
        String result = source;  
        try {  
            result = java.net.URLEncoder.encode(source,encode);  
        } catch (UnsupportedEncodingException e) {  
            e.printStackTrace();  
            return "0";  
        }  
        return result;  
    }
    
    
    public static String urlEncodeGBK(String source) {  
        String result = source;  
        try {  
            result = java.net.URLEncoder.encode(source,"GBK");  
        } catch (UnsupportedEncodingException e) {  
            e.printStackTrace();  
            return "0";  
        }  
        return result;  
    }
    /** 
     *   http         
     * @param req_url      
     * @return 
     */ 
    public static String httpRequest(String req_url) {
        StringBuffer buffer = new StringBuffer();  
        try {  
            URL url = new URL(req_url);  
            HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();  
   
            httpUrlConn.setDoOutput(true);  
            httpUrlConn.setDoInput(true);  
            httpUrlConn.setUseCaches(false);  
            httpUrlConn.setConnectTimeout(50000);
            httpUrlConn.setReadTimeout(50000);
            httpUrlConn.setRequestMethod("GET"); 
           // httpUrlConn.setRequestProperty("Accept", "image/png,image/*;q=0.8,*/*;q=0.5");
           // httpUrlConn.setRequestProperty("Accept-Encoding", "gzip");  
           //httpUrlConn.setRequestProperty("Referer", "http://www.hao123.com/");
            httpUrlConn.connect();  //    
            if (httpUrlConn.getResponseCode() == 200) {
            	
            	//                
                InputStream inputStream = httpUrlConn.getInputStream();  
                InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");  
                BufferedReader bufferedReader = new BufferedReader(inputStreamReader);  
       
                String str = null;  
                while ((str = bufferedReader.readLine()) != null) {  
                    buffer.append(str);  
                }  
                bufferedReader.close();  
                inputStreamReader.close();  
                //       
                inputStream.close();  
                inputStream = null;  
                httpUrlConn.disconnect();
            	           	
            }     
   
        } catch (Exception e) {  
            System.out.println(e.getStackTrace());  
        }  
        return buffer.toString();  
    }  
       
    /** 
     *   http           
     * @param requestUrl      
     * @return InputStream 
     */ 
    public static InputStream httpRequestIO(String requestUrl) {  
        InputStream inputStream = null;  
        try {  
            URL url = new URL(requestUrl);  
            HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();  
            httpUrlConn.setDoInput(true);  
            httpUrlConn.setRequestMethod("GET");  
            httpUrlConn.connect();  
            //           
            inputStream = httpUrlConn.getInputStream();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return inputStream;  
    }
     
     
    /**
     *    URL  GET     
     * 
     * @param url
     *                 URL
     * @param param
     *                ，        name1=value1&name2=value2    。
     * @return URL             
     */
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            //    URL     
            URLConnection connection = realUrl.openConnection();
            //          
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            //        
            connection.connect();
            //          
            Map<String, List<String>> map = connection.getHeaderFields();
            //           
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            //    BufferedReader      URL   
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("  GET      ！" + e);
            e.printStackTrace();
        }
        //   finally       
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }
 
    /**
     *     URL   POST     
     * 
     * @param url
     *                  URL
     * @param param
     *                ，        name1=value1&name2=value2    。
     * @param isproxy
     *                       
     * @return             
     */
    public static String sendPost(String url, String param,boolean isproxy) {
        OutputStreamWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            HttpURLConnection conn = null;
            if(isproxy){//      
                @SuppressWarnings("static-access")
                Proxy proxy = new Proxy(Proxy.Type.DIRECT.HTTP, new InetSocketAddress(proxyHost, proxyPort));
                conn = (HttpURLConnection) realUrl.openConnection(proxy);
            }else{
                conn = (HttpURLConnection) realUrl.openConnection();
            }
            //    URL     
             
            //   POST          
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setRequestMethod("POST");    // POST  
             
             
            //          
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
             
            conn.connect();
             
            //   URLConnection        
            out = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");
            //       
            out.write(param);
            // flush      
            out.flush();
            //   BufferedReader      URL   
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("   POST       ！"+e);
            e.printStackTrace();
        }
        //  finally       、   
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }    
     
    public static void main(String[] args) {
        
        String url = "http://www.baidu.com/s";
        String para ="word=   ";
        String sr=HttpRequestUtil.httpRequest(url);
        //String sr=HttpRequestUtil.sendGet(url,para);
        System.out.println(sr);
        
        //demo:    
        //String sr=HttpRequestUtil.sendPost(url,para,true);
        //System.out.println(sr);
    }
     
}