Android客户端与服务端交互-客户端GET方式登录和客户端POST方式查询

这是一个简单实现了Android客户端与服务端交互-客户端GET方式登录和客户端POST方式查询的一个小案例

package com.jxust.day06;import java.io.IOException;import java.util.ArrayList;import java.util.List;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.codehaus.jackson.map.ObjectMapper;import com.jxust.day06.entity.User;/** * Servlet implementation class Login_Servlet */@WebServlet("/Login_Servlet")public class Login_Servlet extends HttpServlet {private static final long serialVersionUID = 1L;List<User> users;User user;private static final String NAME = "name";private static final String PASSWORD = "password";/** * @see HttpServlet#HttpServlet() */public Login_Servlet() {super();users = new ArrayList<>();user = new User("张飞", '男', 33, 1.99, "123456");users = new ArrayList<>();users.add(user);users.add(new User("王菲", '女', 33, 1.69, "123456"));users.add(new User("刘亦菲", '女', 30, 1.71, "123456"));users.add(new User("李菲", '女', 31, 1.68, "123456"));}/** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse *      response) */protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String name = request.getParameter(NAME);if(name == null){return ;}name =new String(name.getBytes("iso8859-1"),"utf-8");System.out.println("name="+name);String password = request.getParameter(PASSWORD);System.out.println("password="+password);for(int i = 0;i < users.size();i++){User user = users.get(i);if(name.equals(user.getName()) && password.equals(user.getPassword()) ){ObjectMapper om = new ObjectMapper();om.writeValue(response.getOutputStream(), user);//服务器通过输出流发送给客户端System.out.println(user.toString());return ;}}}/** * @see HttpServlet#doPost(HttpServletRequest request, *      HttpServletResponse response) */protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("utf-8");String name = request.getParameter(NAME);List<User> list = new ArrayList<>(); for(User user : users){if(user.getName().indexOf(name) >= 0){// 就是name在user的集合中list.add(user);}}ObjectMapper om = new ObjectMapper();om.writeValue(response.getOutputStream(), list);System.out.println("查询结束");}}

package com.jxust.day06_03_httpurlconnectiondemo;import java.io.IOException;public class MainActivity extends Activity {// 不能写localhost而应该写模拟机的地址10.0.2.2，如果是真机，那么就要写真机的地址// 访问的网络地址private static final String PATH = "http://10.0.2.2:8080/Day06_Servlet/Login_Servlet";EditText metName, metPassword;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();setListener();}private void setListener() {setLoginOnClickListener();setQueryOnClickListener();}private void setQueryOnClickListener() {findViewById(R.id.btnQuery).setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {new Thread() {public void run() {String name = metName.getText().toString();name = "name="+name;try {byte[] data = name.getBytes("utf-8");URL url = new URL(PATH);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setConnectTimeout(5000);conn.setReadTimeout(5000);conn.setDoOutput(true); // doGet中是不需要设置的，但是doPost是需要设置的OutputStream out = conn.getOutputStream();out.write(data);out.flush();if (conn.getResponseCode() != 200) {return;}ObjectMapper om = new ObjectMapper();List<User> users = om.readValue(conn.getInputStream(), List.class);Log.i("main", users.toString());} catch (UnsupportedEncodingException e1) {e1.printStackTrace();} // 将类型转换成utf-8的格式catch (IOException e2) {e2.printStackTrace();}}}.start();}});}private void setLoginOnClickListener() {findViewById(R.id.btnLogin).setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// 创建一个工作线程，因为如果不在工作线程内访问网络有可能会出现异常new Thread() {public void run() {String name = metName.getText().toString();String password = metPassword.getText().toString();StringBuilder sb = new StringBuilder(PATH);sb.append("?name=").append(name).append("&password=").append(password);try {URL url = new URL(sb.toString());HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setReadTimeout(5000); // 读取服务端的时间为5秒钟，如果超过时间就断开服务端连接conn.setConnectTimeout(5000);conn.setRequestMethod("GET");if (conn.getResponseCode() != 200) {// Toast.makeText(MainActivity.this,// "连接服务端失败",// 2000).show();return;}ObjectMapper om = new ObjectMapper();User user = om.readValue(conn.getInputStream(), User.class); // 按User这个类型来解析Log.i("main", user.toString());} catch (MalformedURLException e1) {e1.printStackTrace();} catch (IOException e2) {e2.printStackTrace();}}}.start();}});}private void initView() {metName = (EditText) findViewById(R.id.etName);metPassword = (EditText) findViewById(R.id.etPassword);}}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"     android:orientation="vertical"><EditText     android:id="@+id/etName"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:hint="输入姓名"    android:text="菲"/><EditText     android:id="@+id/etPassword"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:hint="输入登陆密码"    android:text="123456"    android:password="true"/>    <Button        android:id="@+id/btnLogin"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="GET方式登陆" />    <Button        android:id="@+id/btnQuery"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="POST方式查询" />    </LinearLayout>

package com.jxust.day06.entity;import java.io.Serializable;public class User implements Serializable{/** *  */private static final long serialVersionUID = 1L;private String name;private char sex;private int age;private double height;private String password;public String getName() {return name;}public void setName(String name) {this.name = name;}public char getSex() {return sex;}public void setSex(char sex) {this.sex = sex;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public double getHeight() {return height;}public void setHeight(double height) {this.height = height;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public User() {// TODO Auto-generated constructor stub}public User(String name, char sex, int age, double height, String password) {super();this.name = name;this.sex = sex;this.age = age;this.height = height;this.password = password;}@Overridepublic String toString() {return "User [name=" + name + ", sex=" + sex + ", age=" + age+ ", height=" + height + ", password=" + password + "]";}}

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