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一、Android 项目当中设置明文传输

1、设置明文传输的xml

2、引入上述创建的xml

android:networkSecurityConfig="@xml/network_security_config"

二、在MyEclipse当中创建Web项目

1、创建项目

2、创建实体类User

package entity;public class User {
       private int id;    private String name;    private String username;    private String password;    private int age;    private String phone;    public User() {
       }    public User(int id, String name, String username, String password, int age, String phone) {
           this.id = id;        this.name = name;        this.username = username;        this.password = password;        this.age = age;        this.phone = phone;    }    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 getUsername() {
           return username;    }    public void setUsername(String username) {
           this.username = username;    }    public String getPassword() {
           return password;    }    public void setPassword(String password) {
           this.password = password;    }    public int getAge() {
           return age;    }    public void setAge(int age) {
           this.age = age;    }    public String getPhone() {
           return phone;    }    public void setPhone(String phone) {
           this.phone = phone;    }}

3、创建JDBCUtils工具类

package dao;import java.sql.Connection;import java.sql.DriverManager;import java.sql.SQLException;public class JDBCUtils {
       static {
           try {
               Class.forName("com.mysql.jdbc.Driver");        } catch (ClassNotFoundException e) {
               e.printStackTrace();        }    }    public static Connection getConn() {
           Connection  conn = null;        try {
               conn=DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test","root","root");        }catch (Exception exception){
               exception.printStackTrace();        }        return conn;    }    public static void close(Connection conn){
           try {
               conn.close();        } catch (SQLException throwables) {
               throwables.printStackTrace();        }    }}

4、创建UserDao类

package dao;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import entity.User;public class UserDao {
       public boolean login(String name,String password){
           String sql = "select * from users where name = ? and password = ?";        Connection  con = JDBCUtils.getConn();        try {
               PreparedStatement pst=con.prepareStatement(sql);            pst.setString(1,name);            pst.setString(2,password);            if(pst.executeQuery().next()){
                   return true;            }        } catch (SQLException throwables) {
               throwables.printStackTrace();        }finally {
               JDBCUtils.close(con);        }        return false;    }    public boolean register(User user){
           String sql = "insert into users(name,username,password,age,phone) values (?,?,?,?,?)";        Connection  con = JDBCUtils.getConn();        try {
               PreparedStatement pst=con.prepareStatement(sql);            pst.setString(1,user.getName());            pst.setString(2,user.getUsername());            pst.setString(3,user.getPassword());            pst.setInt(4,user.getAge());            pst.setString(5,user.getPhone());            int value = pst.executeUpdate();            if(value>0){
                   return true;            }        } catch (SQLException throwables) {
               throwables.printStackTrace();        }finally {
               JDBCUtils.close(con);        }        return false;    }    public User findUser(String name){
           String sql = "select * from users where name = ?";        Connection  con = JDBCUtils.getConn();        User user = null;        try {
               PreparedStatement pst=con.prepareStatement(sql);            pst.setString(1,name);            ResultSet rs = pst.executeQuery();            while (rs.next()){
                  int id = rs.getInt(1);               String namedb = rs.getString(2);               String username = rs.getString(3);               String passworddb  = rs.getString(4);               int age = rs.getInt(5);                String phone = rs.getString(6);               user = new User(id,namedb,username,passworddb,age,phone);            }        } catch (SQLException throwables) {
               throwables.printStackTrace();        }finally {
               JDBCUtils.close(con);        }        return user;    }}

5、创建对应的LoginServlet

package servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import dao.UserDao;public class LoginServlet extends HttpServlet {
   	public void doGet(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {
   		doPost(request, response);	}	public void doPost(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {
   		String name = request.getParameter("name");		String password =  request.getParameter("password");		response.setCharacterEncoding("UTF-8");		UserDao dao = new UserDao();		boolean login = dao.login(name, password);		String msg = "";		if(login){
   			msg = "成功";		}else{
   			msg = "失败";		}		PrintWriter out = response.getWriter();		out.println(msg);		out.flush();		out.close();	}	}

三、在Android Studio当中调用Servlet

（一）实现登录功能

1、创建连接Servlet的工具类（PostUtil）

package com.example.application01.utils;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.net.HttpURLConnection;import java.net.URL;import java.net.URLEncoder;//访问servletpublic class PostUtil {
       //访问的serlver不一样    //传递的参数不一样    public static String Post(String url,String data)    {
           String msg = "";        try{
               //http://ms-yffprtappszi:8080/AndroidWeb/LoginServlet            HttpURLConnection conn = (HttpURLConnection) new URL("http://10.0.2.2:8080/AndroidWeb/"+url).openConnection();            //设置请求方式,请求超时信息            conn.setRequestMethod("POST");            conn.setReadTimeout(5000);            conn.setConnectTimeout(5000);            //设置运行输入,输出:            conn.setDoOutput(true);            conn.setDoInput(true);            //Post方式不能缓存,需手动设置为false            conn.setUseCaches(false);            //我们请求的数据:            //获取输出流            OutputStream out = conn.getOutputStream();            out.write(data.getBytes());            out.flush();            if (conn.getResponseCode() == 200) {
                   // 获取响应的输入流对象                InputStream is = conn.getInputStream();                BufferedReader reader = new BufferedReader(new InputStreamReader(is));                StringBuffer response = new StringBuffer();                String line=null;                while ((line = reader.readLine()) != null) {
                       response.append(line);                }                msg=response.toString();            }        }catch(Exception e)        {
               e.printStackTrace();        }        return msg;    }}

2、在MainActivity调用这个类

package com.example.application01;import androidx.appcompat.app.AppCompatActivity;import android.content.Intent;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.widget.EditText;import android.widget.Toast;import com.example.application01.dao.UserDao;import com.example.application01.utils.PostUtil;import java.io.UnsupportedEncodingException;import java.net.URLEncoder;public class MainActivity extends AppCompatActivity {
       @Override    protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    public void reg(View view){
           startActivity(new Intent(getApplicationContext(),RegisterActivity.class));    }    public void login(View view){
           EditText EditTextname = (EditText)findViewById(R.id.name);        EditText EditTextpassword = (EditText)findViewById(R.id.password);        new Thread(){
               @Override            public void run() {
                   String data="";                try {
                       data = "name="+ URLEncoder.encode(EditTextname.getText().toString(), "UTF-8")+                            "&password="+ URLEncoder.encode(EditTextpassword.getText().toString(), "UTF-8");                } catch (UnsupportedEncodingException e) {
                       e.printStackTrace();                }                String request = PostUtil.Post("LoginServlet",data);                int msg = 0;                if(request.equals("成功")){
                       msg = 1;                }                hand1.sendEmptyMessage(msg);            }        }.start();    }    final Handler hand1 = new Handler()    {
           @Override        public void handleMessage(Message msg) {
               if(msg.what == 1)            {
                   Toast.makeText(getApplicationContext(),"登录成功",Toast.LENGTH_LONG).show();            }            else            {
                   Toast.makeText(getApplicationContext(),"登录失败",Toast.LENGTH_LONG).show();            }        }    };}

在开启web项目的情况下运行Android项目

（二）实现注册功能

1、在web工程当中创建RegisterServlet

package servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import dao.UserDao;import entity.User;public class RegisterServlet extends HttpServlet {
   			public void doGet(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {
   		doPost(request, response);			}		public void doPost(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {
   				System.out.println("-----------------");		response.setCharacterEncoding("UTF-8");		String name = request.getParameter("name");		String username = request.getParameter("username");		String password =  request.getParameter("password");		String phone =  request.getParameter("phone");		int age =  Integer.parseInt(request.getParameter("age"));						User user = new User();        user.setName(name);        user.setUsername(username);        user.setPassword(password);        user.setAge(age);        user.setPhone(phone);        String msg = "";        UserDao userDao = null;        User uu = null;        	userDao = new UserDao();        	 uu = userDao.findUser(user.getName());        	                boolean flag = false;        if(uu == null){
           	flag = userDao.register(user);                    }                if(flag){
               msg = "成功";        }else{
           	msg = "失败";        }	     if(uu != null)	   	{
   	   		 	   		 msg = "已存在";	   	 }	        PrintWriter out = response.getWriter();		out.println(msg);		out.flush();		out.close();			}}

2、在Android当中的RegisterActivity访问Servlet

package com.example.application01;import androidx.appcompat.app.AppCompatActivity;import android.content.Intent;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.widget.EditText;import android.widget.Toast;import com.example.application01.dao.UserDao;import com.example.application01.entity.User;import com.example.application01.utils.PostUtil;import java.io.UnsupportedEncodingException;import java.net.URLEncoder;public class RegisterActivity extends AppCompatActivity {
       EditText name = null;    EditText username = null;    EditText password = null;    EditText phone = null;    EditText age = null;    @Override    protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);        setContentView(R.layout.activity_register);         name = findViewById(R.id.name);         username = findViewById(R.id.username);         password = findViewById(R.id.password);         phone = findViewById(R.id.phone);         age = findViewById(R.id.age);    }    public void register(View view){
           String cname = name.getText().toString();        String cusername = username.getText().toString();        String cpassword = password.getText().toString();        System.out.println(phone.getText().toString());        String cphone = phone.getText().toString();        int cgae = Integer.parseInt(age.getText().toString());        if(cname.length() < 2 || cusername.length() < 2 || cpassword.length() < 2 ){
               Toast.makeText(getApplicationContext(),"输入信息不符合要求请重新输入",Toast.LENGTH_LONG).show();            return;        }        User user = new User();        user.setName(cname);        user.setUsername(cusername);        user.setPassword(cpassword);        user.setAge(cgae);        user.setPhone(cphone);        new Thread(){
               @Override            public void run() {
                   String data="";                try {
                       data = "&name="+ URLEncoder.encode(user.getName(), "UTF-8")+                            "&username="+ URLEncoder.encode(user.getUsername(), "UTF-8")+                            "&password="+ URLEncoder.encode(user.getPassword(), "UTF-8")+                            "&age="+ URLEncoder.encode(user.getAge()+"", "UTF-8")+                            "&phone="+ URLEncoder.encode(user.getPhone(), "UTF-8");                } catch (UnsupportedEncodingException e) {
                       e.printStackTrace();                }                String request = PostUtil.Post("RegisterServlet",data);                int msg = 0;                if(request.equals("成功")){
                       msg = 2;                }                //已存在                if(request.equals("已存在")){
                       msg = 1;                }                hand.sendEmptyMessage(msg);            }        }.start();    }    final Handler hand = new Handler()    {
           @Override        public void handleMessage(Message msg) {
               if(msg.what == 0)            {
                   Toast.makeText(getApplicationContext(),"注册失败",Toast.LENGTH_LONG).show();            }            if(msg.what == 1)            {
                   Toast.makeText(getApplicationContext(),"该账号已经存在，请换一个账号",Toast.LENGTH_LONG).show();            }            if(msg.what == 2)            {
                   //startActivity(new Intent(getApplication(),MainActivity.class));                Intent intent = new Intent();                //将想要传递的数据用putExtra封装在intent中                intent.putExtra("a","註冊");                setResult(RESULT_CANCELED,intent);                finish();            }        }    };}

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