Android 的网络编程(15)-Http JSon服务器端和客户端通信

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
}

}

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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;@Overridepublic 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());}}}