Android Studio 实现登录注册-源代码二（Servlet + 连接MySql数据库）

Posted 2021-08-22 蓝盒子bluebox

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Android Studio 实现登录注册-源代码（连接MySql数据库）
Android Studio 实现登录注册-源代码二（Servlet + 连接MySql数据库）
[Android Studio 实现登录注册-源代码三（Servlet + 连接MySql数据库）实现学生信息的查询（JSON通信）]
Android Studio 实现实现学生信息的增删改查 -源代码四（Servlet + 连接MySql数据库）

一、android 项目当中设置明文传输

1、设置明文传输的xml

<?xml version="1.0" encoding="UTF-8"?>
<network-security-config>
    <base-config cleartextTrafficPermitted="true"/>
</network-security-config>

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

引入mysql的驱动包

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servlet
public 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).以上是关于Android Studio 实现登录注册-源代码  二（Servlet +  连接MySql数据库）的主要内容，如果未能解决你的问题，请参考以下文章 
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Android Studio 实现登录注册-源代码 二（Servlet + 连接MySql数据库）

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

二、在MyEclipse当中创建Web项目

1、创建项目

2、创建实体类User

3、创建JDBCUtils工具类

4、创建UserDao类

5、创建对应的LoginServlet

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）

2、在MainActivity调用这个类

Android Studio 实现登录注册-源代码二（Servlet + 连接MySql数据库）