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三者，必然是有三个大标题和环节。

1. mysql数据库端

新建表user，再创建id和password，具体结构可参考如下：

2.服务器端

java web代码：

package vip.keshi;import java.io.IOException;import java.io.PrintWriter;import java.sql.DriverManager;import java.sql.SQLException;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 com.mysql.jdbc.Connection;import com.mysql.jdbc.PreparedStatement;import com.mysql.jdbc.ResultSet;import jdk.internal.org.objectweb.asm.tree.analysis.Value;/** * Servlet implementation class buxing */@WebServlet("/buxing")public class buxing extends HttpServlet {
   	private static final long serialVersionUID = 1L;           /**     * @see HttpServlet#HttpServlet()     */    public buxing() {
           super();        // TODO Auto-generated constructor stub    }        public void init() throws ServletException {
       	// TODO Auto-generated method stub    	super.init();    	    	try {
   			Class.forName("com.mysql.jdbc.Driver");			System.err.println("驱动加载成功");		} catch (ClassNotFoundException e) {
   			// TODO Auto-generated catch block			e.printStackTrace();		}    }	/**	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)	 */	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
   		// TODO Auto-generated method stub				response.setCharacterEncoding("UTF-8");        response.setContentType("text/html");        PrintWriter out = response.getWriter();		String logname = request.getParameter("logname").trim();		String password = request.getParameter("password").trim();				java.sql.Connection conn;        //连接数据库        java.sql.PreparedStatement preparedStatement; 		try {
   						conn = DriverManager.getConnection("JDBC:mysql://自己数据库的项目url", "数据库名", "数据库密码");//例如"JDBC:mysql://123.12.246.197:3306/denglei", "denglei", "123456"			String sql = "insert into user values(?,?)";						preparedStatement = conn.prepareStatement(sql);			preparedStatement.setString(1,logname);	        preparedStatement.setString(2,password);	        	        int p=preparedStatement.executeUpdate();	        //取得操作结果，true或false	        if (p>=1) {
   				System.out.println("注册成功!");				out.write("successReg"); 			}else {
   				System.out.println("注册失败");				out.write("falseReg"); 			}	        out.close();	        System.out.println("关闭成功");		} catch (SQLException e) {
   			// TODO Auto-generated catch block			e.printStackTrace();		}	}	/**	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)	 */	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
   		// TODO Auto-generated method stub		doGet(request, response);	}}

服务器网页HTML：

3.安卓端

• 导入okhttp包，看build.gradle

apply plugin: 'com.android.application'android {
       compileSdkVersion 30    buildToolsVersion "30.0.1"    defaultConfig {
           applicationId "vip.mtmy.okhope"        minSdkVersion 24        targetSdkVersion 30        versionCode 1        versionName "1.0"        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"    }    buildTypes {
           release {
               minifyEnabled false            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'        }    }}dependencies {
       implementation fileTree(dir: 'libs', include: ['*.jar'])    implementation 'androidx.appcompat:appcompat:1.1.0'    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'    testImplementation 'junit:junit:4.12'    androidTestImplementation 'androidx.test.ext:junit:1.1.1'    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'    implementation 'com.squareup.okhttp3:okhttp:3.4.1'//就是这个①    implementation 'com.squareup.okio:okio:1.9.0'//就是这个②    implementation 'com.google.code.gson:gson:2.6.2'}

• 权限中添加网路权限

• MainActivity代码

package vip.mtmy.okhope;import androidx.annotation.NonNull;import androidx.appcompat.app.AppCompatActivity;import android.annotation.SuppressLint;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;import java.io.IOException;import okhttp3.OkHttpClient;import okhttp3.Request;import okhttp3.Response;public class MainActivity extends AppCompatActivity {
       public static final int REGS=3;//注册成功标识码    public static final int REGN=4;//注册失败标识码    TextView idnumber;    TextView pwdnumber;    Button regerest;    OkHttpClient client = new OkHttpClient();    @SuppressLint("HandlerLeak")    public Handler handler=new Handler(){
           @Override        public void handleMessage(@NonNull Message msg) {
               super.handleMessage(msg);            switch (msg.what){
                   case REGS:                    Toast.makeText(MainActivity.this,"注册成功",Toast.LENGTH_SHORT).show();                    break;                case REGN:                    Toast.makeText(MainActivity.this,"注册失败",Toast.LENGTH_SHORT).show();                    break;            }        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initall();    }    private void initall() {
           idnumber=findViewById(R.id.idnumber);        pwdnumber=findViewById(R.id.pwdnumber);        regerest=findViewById(R.id.regerest);        regerest.setOnClickListener(new View.OnClickListener() {
               @Override            public void onClick(View view) {
                   getData();            }        });    }    public void getData(){
           final String url="http://自己的域名和项目路径";//自己项目的url，也就是java web的url        new Thread(){
               @Override            public void run() {
                   super.run();                try {
                       String path=url+"?logname="+idnumber.getText()+"&password="+pwdnumber.getText();                    String result=get(path);                    if (result.equals("ttt")){
                           Message message=Message.obtain();                        message.what= REGN;                       // message.obj=result;                        handler.sendMessage(message);                    }                    else {
                           Message message=Message.obtain();                        message.what= REGS;                        message.obj=result;                        handler.sendMessage(message);                    }                } catch (IOException e) {
                       e.printStackTrace();                }            }        }.start();    }    String get(String url) throws IOException {
           Request request = new Request.Builder()                .url(url)                .build();        try (Response response = client.newCall(request).execute()) {
               return response.body().string();        }    }}

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