参考《疯狂android讲义》》730页
JSON的基础请参考W3SCHOOL的教程:
http://www.w3school.com.cn/json/index.asp
例子:
http://wenku.baidu.com/link?url=A5SiKBUNVx-aB_hFiDuHsEN1uw_Vu4a9ODRq7G-SpiY-qW11Ve8Ba8ym9TfheAUuHJhYgdD3g05lvGNWrPBzf7JZFhUlAcZYb0MMIdrcmp3
1、创建服务器端:
(1)创建对象类
package com.ljh.jsondemo.model; public class User { public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } public String getGender() { return gender; } public void setGender(String gender) { this.gender = gender; } private int id; private String name; private String email; private String gender; }
(2)创建json的提供类
package com.ljh.jsondemo.servlet; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.json.JSONArray; import org.json.JSONObject; import com.ljh.jsondemo.model.User; public class JsonDemoServlet extends HttpServlet { private static final long serialVersionUID = -7368225680407826408L; private List<User> list; /** * 处理post方式提交的数据 */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } /** * 处理get方式提交的数据 */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/plain"); response.setCharacterEncoding("UTF-8"); PrintWriter out = response.getWriter(); // 准备用户数据 prepareData(); // JSON数组 JSONArray array = new JSONArray(); for (User bean : list) { // 单个用户JSON对象 JSONObject obj = new JSONObject(); try { obj.put("id", bean.getId()); obj.put("name", bean.getName()); obj.put("email", bean.getEmail()); obj.put("gender", bean.getGender()); } catch (Exception e) { } array.put(obj); } // 输出 out.write(array.toString()); out.flush(); out.close(); } private void prepareData() { list = new ArrayList<User>(); User bean1 = new User(); bean1.setId(1001); bean1.setName("Tony"); bean1.setEmail(""); bean1.setGender("male"); list.add(bean1); User bean2 = new User(); bean2.setId(1002); bean2.setName("Jack"); bean2.setEmail(""); bean2.setGender("male"); list.add(bean2); User bean3 = new User(); bean3.setId(1003); bean3.setName("Marry"); bean3.setEmail(""); bean3.setGender("female"); list.add(bean3); User bean4 = new User(); bean4.setId(1004); bean4.setName("Linda"); bean4.setEmail(""); bean4.setGender("female"); list.add(bean4); } }
2、创建android客户端
注意要添加访问internet的权限。
package com.ljh.jsondemoclient; import java.io.BufferedReader; import java.io.InputStreamReader; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.params.HttpConnectionParams; import org.apache.http.params.HttpParams; import org.json.JSONArray; import org.json.JSONObject; import android.os.Bundle; import android.app.Activity; import android.widget.TextView; public class MainActivity extends Activity { private String getContent(String url) throws Exception { StringBuilder sb = new StringBuilder(); HttpClient client = new DefaultHttpClient(); HttpParams httpParams = client.getParams(); // 设置网络超时参数 HttpConnectionParams.setConnectionTimeout(httpParams, 3000); HttpConnectionParams.setSoTimeout(httpParams, 5000); HttpResponse response = client.execute(new HttpGet(url)); HttpEntity entity = response.getEntity(); if (entity != null) { System.out.println("test!!!!"); BufferedReader reader = new BufferedReader(new InputStreamReader( entity.getContent(), "UTF-8"), 8192); String line = null; while ((line = reader.readLine()) != null) { sb.append(line + " "); } reader.close(); } return sb.toString(); } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); try { StringBuffer sb = new StringBuffer(); // 在测试过程中,经常是用本机做测试服务器,访问本机的IP地址要设置为10.0.2.2 String url = "192.168.136.133:8080/JsonDemoServer/JsonDemoServlet"; String body = getContent(url); JSONArray array = new JSONArray(body); for (int i = 0; i < array.length(); i++) { JSONObject obj = array.getJSONObject(i); sb.append("id:").append(obj.getInt("id")).append(" "); sb.append("name:").append(obj.getString("name")).append(" "); sb.append("gender:").append(obj.getString("gender")) .append(" "); sb.append("email:").append(obj.getString("email")) .append(" "); sb.append("---------------------- "); } TextView textView = (TextView) findViewById(R.id.tv_json_content); textView.setText(sb.toString()); } catch (Exception e) { } } }