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

2015-12-11 01:47:39 375 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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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();

	}