大家看看，使用HttpURlConnnection老是报400，这是怎么回事呢

[小哈的秘密城堡]

这个项目用HttpClient请求就没有问题，一换HttpUrlConnection就报400，先贴HttpClient的代码

分全给了。只要能解决。

public String connectionOnline(String[] parameter, Object[] parameterValue,
			String method,Context context) {
		String result = "";
		DefaultHttpClient client = null;
		try {
			String url = “http://ip:端口/AsyncTask.svc”   //这里用的是C#的服务端
			//DBOpenHelper db = new DBOpenHelper(context);
			//String url=db.Address().toString();
			HttpPost req = new HttpPost(url + "/" + method);
			req.setHeader("Accept", "application/json");
			req.setHeader("Content-type", "application/json");
			// 设置连接参数
			
			BasicHttpParams connParams = new BasicHttpParams();
			HttpConnectionParams.setConnectionTimeout(connParams, 20 * 1000);
			HttpConnectionParams.setSoTimeout(connParams, 20 * 1000);

			JSONObject o = new JSONObject();
			for (int i = 0; i < parameter.length; i++) {
				o.put(parameter[i], parameterValue[i]);
			}

			StringEntity s = new StringEntity(o.toString(), "utf-8");
			req.setEntity(s);

			// 构建执行请求客户端实例
			client = new DefaultHttpClient(connParams);

			// 发送请求,接收响应
			HttpResponse resp = client.execute(req);
			int g = resp.getStatusLine().getStatusCode();
			// 判断响应码是否为200
			if (resp.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
				// 获取响应数据实体类
				HttpEntity respEntity = resp.getEntity();
				result = EntityUtils.toString(respEntity, "utf-8");
			}

		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			// 关闭连接
			client.getConnectionManager().shutdown();

		}
		Log.i("a", result);
		return result;

	}

下面在贴贴我写的HttpUrlConnection

public String connectionResult(String[] parameter,Object[] parameterValue,
			String method,Context context){
		HttpURLConnection conn = null;
		PrintWriter printWriter = null;  
        BufferedReader bufferedReader = null;
        StringBuffer responseResult = new StringBuffer();  
        StringBuffer params = new StringBuffer();
        String myparams="";
		try {
			String myurl = “http://ip:端口/AsyncTask.svc”   //这里用的是C#的服务端
			String newUrl = myurl + method;
			URL url = new URL(newUrl);
	        conn = (HttpURLConnection) url.openConnection();
	        conn.setRequestMethod("POST");// 提交模式
	        conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");  
	        conn.setUseCaches(false);   
            conn.setInstanceFollowRedirects(false);
	        // 设置通用的请求属性
            conn.setRequestProperty("accept", "application/json");  
            conn.setRequestProperty("connection", "Keep-Alive");  
            // 发送POST请求必须设置如下两行  
            conn.setDoOutput(true);  
            conn.setDoInput(true);
            conn.connect();   
            
            DataOutputStream out = new DataOutputStream(conn.getOutputStream());   

            if(parameter.length > 0){
				for(int i=0;i<parameter.length;i++){
	    			params.append(parameter[i]+"="+URLEncoder.encode(parameterValue[i].toString(), "utf-8")+"&");
	    		}
				if(params.lastIndexOf("&")>0){
					myparams = params.substring(0,params.length()-1);
				}
			}
            out.writeBytes(myparams.toString());
            out.flush();
            out.close();
                        
            // 根据ResponseCode判断连接是否成功  
            int responseCode = conn.getResponseCode();  
            if (responseCode != 200) {  
            	System.out.println("Not Success");
            } else {  
            	System.out.println("Success");
            }  
            // 定义BufferedReader输入流来读取URL的ResponseData  
            bufferedReader = new BufferedReader(new InputStreamReader(  
                    conn.getInputStream()));  
            String line;  
            while ((line = bufferedReader.readLine()) != null) {  
                responseResult.append(line);  
                System.out.println(line);
            }  
			/* 关闭DataOutputStream */
		} catch (IOException e) {
			e.printStackTrace();
		} catch (Exception e) {
			e.printStackTrace();
		}finally{
			conn.disconnect();  
            try {  
                if (printWriter != null) {  
                    printWriter.close();  
                }  
                if (bufferedReader != null) {  
                    bufferedReader.close();  
                }  
            } catch (IOException ex) {  
                ex.printStackTrace();  
            } 
		}
		return responseResult.toString();
	}

下面是错误类型：

求各位美女帅哥们看看。拜托了

[Sero_T]

这个以前也遇到过类似的，好像是和服务端有关系。。。

[小哈的秘密城堡]

问题经大神指点解决了， 贴上我C#服务端代码：

[OperationContract]
        [WebInvoke(
        Method = "POST",
        ResponseFormat = WebMessageFormat.Json,
        RequestFormat = WebMessageFormat.Json,
        BodyStyle = WebMessageBodyStyle.WrappedRequest,
        UriTemplate = "GetUsers")]
        int GetUsers(string userName, string userPwd);

这里接收的是json数据，然而我发送数据的时候发送的是conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"); 这里我改成了conn.setRequestProperty("Content-Type", "application/json"); 还有那个参数的形式，拼成json后以流发出就好了 修改后代码：

 DataOutputStream out = new DataOutputStream(conn.getOutputStream());   

            JSONObject o = new JSONObject();
			for (int i = 0; i < parameter.length; i++) {
				o.put(parameter[i], parameterValue[i]);
			}

			out.writeBytes(o.toString());
            out.flush();
            out.close();

。