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;

	@Override
	protected 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() {

			@Override
			public 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() {

			@Override
			public 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;
	}
	@Override
	public String toString() {
		return "User [name=" + name + ", sex=" + sex + ", age=" + age
				+ ", height=" + height + ", password=" + password + "]";
	}
	
}