http实现发送post请求，获取结果集

1 package com.ming;
 2 
 3 import java.io.BufferedReader;
 4 import java.io.InputStreamReader;
 5 import java.io.OutputStreamWriter;
 6 import java.io.PrintWriter;
 7 import java.net.HttpURLConnection;
 8 import java.net.URL;
 9 import java.util.Map;
10 
11 
12 public class HttpBaseUtil {
13 
14     
15     /**
16      * 向指定的url发送post方法,并获取放回值
17      * @param url 发送的url
18      * @param param 发送的参数 参数形式a=2&b=2
19      * @param head 请求头设定
20      */
21     public static String sendPostUrl(String url,String param,Map<String, String> head) throws Exception{
22         StringBuffer result=new StringBuffer();
23         PrintWriter out =null;
24         BufferedReader in=null;
25         try {
26             URL realUrl = new URL(url);
27             // 打开和URL之间的连接
28             HttpURLConnection  conn =(HttpURLConnection)realUrl.openConnection();
29             // 设置通用的请求属性
30             conn.setRequestProperty("accept", "*/*");
31             conn.setRequestProperty("connection", "Keep-Alive");
32             conn.setRequestProperty("user-agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
33             if(head!=null && !head.isEmpty()){
34                 for (String key:head.keySet()){
35                     conn.setRequestProperty(key, head.get(key));
36                 }
37             }
38             conn.setDoOutput(true);
39             conn.setDoInput(true);
40             // 获取URLConnection对象对应的输出流
41             out = new PrintWriter(new OutputStreamWriter(conn.getOutputStream(),"UTF-8"));
42             // 发送请求参数
43             out.print(param);
44             // flush输出流的缓冲
45             out.flush();
46             // 定义BufferedReader输入流来读取URL的响应
47             in = new BufferedReader(new InputStreamReader(conn.getInputStream(),"UTF-8"));
48             String line;
49             while ((line = in.readLine()) != null) {
50                 result.append(line);
51             }
52         } catch (Exception e) {
53             throw new Exception("发送post出现异常."+e.getMessage());
54         }
55         return result.toString();
56     }
57     
58 }      

1 import org.apache.http.HttpResponse;
 2 import org.apache.http.client.ClientProtocolException;
 3 import org.apache.http.client.HttpClient;
 4 import org.apache.http.client.ResponseHandler;
 5 import org.apache.http.client.methods.HttpUriRequest;
 6 
 7 import java.io.IOException;
 8 
 9 public class LocalHttpClient {
10 
11     private static LocalHttpClient localHttpClient;
12     protected HttpClient httpClient;
13 
14     private static int maxTotal = 100;
15     private static int maxPerRoute = 10;
16     public static void init(int maxTotal,int maxPerRoute){
17         LocalHttpClient.maxTotal = maxTotal;
18         LocalHttpClient.maxPerRoute = maxPerRoute;
19     }
20 
21     public static LocalHttpClient getInstance(){
22         if(localHttpClient != null){
23             return localHttpClient;
24         }else{
25             localHttpClient = new LocalHttpClient();
26             if(maxTotal > 0){
27                 localHttpClient.httpClient = HttpClientFactory.createHttpClient(maxTotal,maxPerRoute);
28             }else{
29                 localHttpClient.httpClient = HttpClientFactory.createHttpClient();
30             }
31             return localHttpClient;
32         }
33     }
34 
35     public HttpResponse execute(HttpUriRequest request){
36         try {
37             return httpClient.execute(request);
38         } catch (ClientProtocolException e) {
39             e.printStackTrace();
40         } catch (IOException e) {
41             e.printStackTrace();
42         }
43         return null;
44     }
45 
46     public <T> T execute(HttpUriRequest request,ResponseHandler<T> responseHandler){
47         try {
48             return httpClient.execute(request, responseHandler);
49         } catch (ClientProtocolException e) {
50             e.printStackTrace();
51         } catch (IOException e) {
52             e.printStackTrace();
53         }
54         return null;
55     }
56 }