android网络通讯数据封装之 json

Demo程序包括客户端和服务端

客户端按json数据格式封装数据传至服务端。

服务端为简单的servlet程序，负责接收客户端传到json数据，然后按原数据返回客户端.

实例代码如下:

public static String cmdLogIn() {
   String urlString = "http://192.168.8.75:89/webroot/jsontest";
   HttpPost request = new HttpPost(urlString);
      try{
    //json数据格式{"data":{"spring":"yes","java":"ok"},
                   "head": {"password":"123456","name":"rarnu"}}
    //封装代码
         JSONObject headParam = new JSONObject();
         headParam.put("name", "yihu");
         headParam.put("password", "123456");

         JSONObject dataParam = new JSONObject();
         dataParam.put("java", "ok");
         dataParam.put("spring", "yes");
   
         JSONObject paramss = new JSONObject();
         paramss.put("head", headParam);
         paramss.put("data", dataParam);

  //json数据格式
{"data":[{"spring":"yes","java":"ok"}],
 "head":[{"password":"123456","name":"yihu"},{"arry1":"java","classid":"321546"}]}
   
   JSONArray headParams = new JSONArray();
   //数组[0]
   JSONObject headParam1 = new JSONObject();
   headParam1.put("name", "yihu");
   headParam1.put("password", "123456");
   //数组[1]
   JSONObject headParam2 = new JSONObject();
   headParam2.put("arry1", "java");
   headParam2.put("classid", "321546");
   headParams.put(headParam1);
   headParams.put(headParam2);
   
   JSONArray dataParams = new JSONArray();
   JSONObject dataParam = new JSONObject();
   dataParam.put("java", "ok");
   dataParam.put("spring", "yes");
   dataParams.put(dataParam);
   
   JSONObject paramss = new JSONObject();
   paramss.put("head", headParams);
   paramss.put("data", dataParams);
           
        Log.v("tag", "params.toString() >>> :"+paramss.toString());
       // 绑定到请求 Entry
       StringEntity se = new StringEntity(paramss.toString());
       request.setEntity(se);
       // 发送请求
       HttpResponse httpResponse = new DefaultHttpClient().execute(request);
       int statusCode = httpResponse.getStatusLine().getStatusCode();
       Log.v("tag", "statusCode <- :"+statusCode);
      if (statusCode == 200) {
        InputStream entityStream;
        try {
           entityStream = httpResponse.getEntity().getContent();
           String jsonString = convertStreamToString(entityStream);
           Log.v("tag", "jsonString <- :"+jsonString);
           if ("".equals(jsonString))
              return null;
           JSONObject json = new JSONObject(jsonString);
           JSONObject head = json.getJSONObject("head");
           Log.v("TAG", "name >> :"+head.optString("name"));

           return json.optString("java");
         }catch (Exception e) {
      }
    }
   }catch (Exception e) {
   }
  return null;
 }
 
 private static String convertStreamToString(InputStream is) {
   StringBuilder sb = new StringBuilder();
   try {
     BufferedReader reader = new BufferedReader(new InputStreamReader(
      is, "UTF-8"), 8 * 1024);
    String line = null;
    while ((line = reader.readLine()) != null) {
     sb.append(line + "n");
    }
   } catch (IOException e) {
    sb.delete(0, sb.length());
   } finally {
    try {
     is.close();
    } catch (IOException e) {
     
    }
   }
   return sb.toString();
    }

服务端测试代码

public class LoadServlet extends HttpServlet {
 public void destroy() {
  super.destroy();
 }
 
 public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  StringBuffer messagebuffer = new StringBuffer();
  javax.servlet.ServletInputStream in = request.getInputStream();
  DataInputStream din = new DataInputStream(in);
  int ch;
  while ((ch = din.read()) != -1)
   messagebuffer.append((char) ch);
  din.close();
  
  String message = messagebuffer.toString();
  System.out.println("content...>>>:" + message);
  
  ByteArrayOutputStream bout = new ByteArrayOutputStream();
  DataOutputStream dout = new DataOutputStream(bout);
  byte str[] = message.getBytes("UTF-8");
  dout.write(str);
  byte data[] = bout.toByteArray();
  OutputStream out = response.getOutputStream();
  out.write(data);
  out.close();
 }
 public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  doGet(request, response);
 }
 public void init() throws ServletException {
 }
}
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
 xmlns="http://java.sun.com/xml/ns/javaee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
 http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <servlet>
    <description>jsontest</description>
    <display-name>jsontest</display-name>
   
    <servlet-name>jsonServlet</servlet-name>
    <servlet-class>com.yihu.json.servlet.LoadServlet</servlet-class>
   
  </servlet>
  <servlet-mapping>
    <servlet-name>jsonServlet</servlet-name>
    <url-pattern>/jsontest</url-pattern>
  </servlet-mapping>
</web-app>