Android 的网络编程(15)-Http JSon服务器端和客户端通信

Android  Http JSon服务器端和客户端通信 
 服务器端： 

package com.web.servlet;import java.io.IOException;import java.io.PrintWriter;import java.util.ArrayList;import java.util.Iterator;import java.util.List;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import net.sf.json.JSONArray;import net.sf.json.JSONObject;import com.web.model.User;public class JSONServlet extends HttpServlet {/** * Constructor of the object. */public JSONServlet() {super();}/** * Destruction of the servlet. <br> */public void destroy() {super.destroy(); // Just puts "destroy" string in log// Put your code here}/** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. *  * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doPost(request, response); }/** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to post. *  * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html");PrintWriter out = response.getWriter();        List<User> list = new ArrayList<User>();                User u1 = new User();        u1.setId(111);        u1.setUsername("zhang shan");        u1.setPassword("zs");                User u2 = new User();        u2.setId(222);        u2.setUsername("li si");        u2.setPassword("ls");                User u3 = new User();        u3.setId(333);        u3.setUsername("wang wu");        u3.setPassword("ww");                list.add(u1);        list.add(u2);        list.add(u3);                JSONArray ja = new JSONArray();        for (Iterator iterator = list.iterator(); iterator.hasNext();) {User user = (User) iterator.next();JSONObject jobj= new JSONObject();jobj.put("id", user.getId());jobj.put("username", user.getUsername());jobj.put("password", user.getPassword());ja.add(jobj);}                out.write(ja.toString());           out.flush();           out.close(); }/** * Initialization of the servlet. <br> * * @throws ServletException if an error occurs */public void init() throws ServletException {// Put your code here}}

手机端：

package com.web.activity;import java.io.BufferedInputStream;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.ObjectInputStream;import java.io.UnsupportedEncodingException;import java.util.ArrayList;import java.util.Iterator;import java.util.List;import org.apache.commons.httpclient.Cookie;import org.apache.commons.httpclient.HttpException;import org.apache.commons.httpclient.HttpStatus;import org.apache.commons.httpclient.NameValuePair;import org.apache.commons.httpclient.methods.PostMethod; import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.ClientProtocolException; import org.apache.http.client.HttpClient;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.methods.HttpPost;import org.apache.http.client.methods.HttpUriRequest;import org.apache.http.entity.StringEntity;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.message.BasicNameValuePair;import org.apache.http.params.HttpConnectionParams;import org.apache.http.params.HttpParams;import org.apache.http.protocol.HTTP;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;import com.web.model.User;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;public class WebclientActivity extends Activity { private TextView hello;      @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);  HttpClient httpclient = new DefaultHttpClient();String uri="http://10.11.72.108:8086/web/JSONServlet";HttpPost httpReqest = new HttpPost(uri);   try {  HttpResponse response = httpclient.execute(httpReqest);   HttpEntity entity = response.getEntity(); BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent())); StringBuffer sb = new StringBuffer();     String line = null;            while ((line = reader.readLine()) != null) {                sb.append(line + "\n");            }            reader.close();   JSONArray ja = new JSONArray(sb.toString());    StringBuffer sb2 = new StringBuffer();  for (int i = 0; i < ja.length(); i++) {JSONObject jobj= (JSONObject)ja.get(i);sb2.append("id:").append(jobj.getInt("id")).append(" ");            sb2.append("用户:").append(jobj.getString("username")).append(" ");            sb2.append("密码:").append(jobj.getString("password")).append("\r\n");  }            TextView hello = (TextView) findViewById(R.id.helloid);  hello.setText(sb2.toString());} catch (Exception e) { Log.i("uuu", e.toString());}      } }