使用http連接創(chuàng)建，發(fā)送post和get請(qǐng)求

/**
 * 作用 : 
 *   http request的java工具類；
 *   
 */
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

public class HttpRequest {
    /**
     * 向指定URL發(fā)送GET方法的請(qǐng)求
     * 
     * @param url
     *            發(fā)送請(qǐng)求的URL
     * @param param
     *            請(qǐng)求參數(shù)，請(qǐng)求參數(shù)應(yīng)該是 name1=value1&name2=value2 的形式。
     * @return URL 所代表遠(yuǎn)程資源的響應(yīng)結(jié)果
     */
    public static String sendGet(String url, String param) {
        BufferedReader in = null;
        StringBuffer sbRes = new StringBuffer();
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打開和URL之間的連接
            HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();
            // 設(shè)置通用的請(qǐng)求屬性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive"); 
            conn.setConnectTimeout(10000);
            conn.setReadTimeout(10000);
            conn.connect();
          
            if (HttpURLConnection.HTTP_OK != conn.getResponseCode()) {
                throw new Exception("get failed ErrorCode="+conn.getResponseCode());
            }       
            
            // 定義 BufferedReader輸入流來讀取URL的響應(yīng)
            in = new BufferedReader(new InputStreamReader(
                    conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                sbRes.append(line).append("\r\n");
            }
        }catch (MalformedURLException e) {
            System.out.println("Get failed.The specified URL " + param
                    + " is not a valid URL. Please check");
            e.printStackTrace();
            System.out.println(url+param);
            sbRes.append("get failed,param:"+param);
        } catch (IOException e) {
            System.out.println("Get failed.An error occured. Please check that Solr is running.");
            e.printStackTrace();
            System.out.println(url+param);
            sbRes.append("get failed,param:"+param);
        }catch (Exception e) {
            e.printStackTrace();
            System.out.println(url+param);
            sbRes.append("get failed,param:"+param);
        }
        // 使用finally塊來關(guān)閉輸入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return sbRes.toString();
    }

    /**
     * 向指定 URL 發(fā)送POST方法的請(qǐng)求
     * 
     * @param url
     *            發(fā)送請(qǐng)求的 URL
     * @param param
     *            請(qǐng)求參數(shù)，請(qǐng)求參數(shù)應(yīng)該是 name1=value1&name2=value2 的形式。
     * @return 所代表遠(yuǎn)程資源的響應(yīng)結(jié)果
     */
    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        StringBuffer sbRes = new StringBuffer();
        try {
            URL realUrl = new URL(url);
            // 打開和URL之間的連接
            HttpURLConnection conn = (HttpURLConnection)realUrl.openConnection();
            // 設(shè)置通用的請(qǐng)求屬性
            conn.setRequestMethod("POST");
            conn.setDoOutput(true);
//          conn.setDoInput(true);
//          conn.setUseCaches(false);
//          conn.setAllowUserInteraction(false);
            conn.setRequestProperty("Content-type", "text/json"); 
//          conn.setChunkedStreamingMode(1024*50);
            // 獲取URLConnection對(duì)象對(duì)應(yīng)的輸出流
            out = new PrintWriter(new OutputStreamWriter(conn.getOutputStream(), "UTF-8"));
            // 發(fā)送請(qǐng)求參數(shù)
            out.print(param);
            // flush輸出流的緩沖
            out.flush();
            
            if (HttpURLConnection.HTTP_OK != conn.getResponseCode()) {
                if (conn.getResponseCode() == HttpURLConnection.HTTP_BAD_REQUEST
                        || conn.getResponseCode() == HttpURLConnection.HTTP_INTERNAL_ERROR) {
                    throw new Exception("post failed ErrorCode="+conn.getResponseCode());
                }
                System.out.println("ErrorCode="+conn.getResponseCode());
            }       
            // 定義BufferedReader輸入流來讀取URL的響應(yīng)
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                sbRes.append(line).append("\r\n");
            }
        } catch (Exception e) {
            System.out.println("發(fā)送 POST 請(qǐng)求出現(xiàn)異常！"+e);
            e.printStackTrace();
            sbRes.append("post failed");
        }
        //使用finally塊來關(guān)閉輸出流、輸入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        
        return sbRes.toString();
    }    
}