HttpUrlConnection发起POST请求

 1 StringBuffer str=new StringBuffer();
 2             Map<String,Object> requestParamsMap = new HashMap<String, Object>();  
 3             requestParamsMap.put("type",0);//添加绑定参数
 4             Iterator it=requestParamsMap.entrySet().iterator();//获取迭代器
 5             while(it.hasNext()){
 6                 Map.Entry<String, Object> element=(Entry<String, Object>) it.next();
 7                 str.append(element.getKey());
 8                 str.append("=");
 9                 str.append(element.getValue());
10                 str.append("&");
11             }
12             if(str.length()>0)
13                 str.deleteCharAt(str.length()-1);//删除末尾多余的一个&
14              try {
15                  URL url=new java.net.URL(URLStr);
16                  URLConnection connection=url.openConnection();
17                  HttpURLConnection con=(HttpURLConnection)connection;
18                  con.setDoOutput(true);
19                  con.setRequestMethod("POST");
20                  PrintWriter writer =new PrintWriter(con.getOutputStream());
21                  writer.write(str.toString());
22                  writer.flush();
23                  writer.close();
24                  BufferedReader reader=new BufferedReader(new InputStreamReader(con.getInputStream()));
25                  String line=null;
26                  String result="";
27                  while((line=reader.readLine())!=null){
28                      result+=line;
29                  }
30                  System.out.println(result);
31              } catch (Exception e) {
32                  // TODO Auto-generated catch block
33                  e.printStackTrace();
34          }