1.添加okhttp依赖，具体根据自己的okhttp包来决定
dependencies {
...
implementation 'com.squareup.okhttp3:okhttp:3.10.0'
implementation 'com.squareup.okio:okio:1.5.0'
}
1.新建XML文件，文件名network_security_config
<network-security-config>
<base-config cleartextTrafficPermitted="true" />
network-security-config>
1.添加网络权限
<uses-permission android:name="android.permission.INTERNET" />
2.添加网络配置第1步和第2步
<application
...
android:usesCleartextTraffic="false"
android:networkSecurityConfig="@xml/network_security_config">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:orientation="vertical"
android:layout_margin="10dp">
<EditText
android:id="@+id/loginAccount_etext"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:maxLines="1"
android:hint="请输入账号"/>
<EditText
android:id="@+id/loginPassword_etext"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:maxLines="1"
android:hint="请输入密码"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="@+id/loginBtn"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:text="登录"/>
<Button
android:id="@+id/registerBtn"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:text="注册"/>
LinearLayout>
LinearLayout>
package com.example.okhttptest;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import java.io.IOException;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Response;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private EditText loginAccount_etext;
private EditText loginPassword_etext;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
loginAccount_etext = findViewById(R.id.loginAccount_etext);
loginPassword_etext = findViewById(R.id.loginPassword_etext);
Button loginBtn = findViewById(R.id.loginBtn);
Button registerBtn = findViewById(R.id.registerBtn);
registerBtn.setOnClickListener(this);
loginBtn.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.loginBtn:
String loginAddress="http://192.168.1.104:9977/Okhttptest/LoginServlet?";
//http://电脑ip地址:tomcat端口号/java项目名/类名?
String loginAccount = loginAccount_etext.getText().toString();
String loginPassword = loginPassword_etext.getText().toString();
loginWithOkHttp(loginAddress,loginAccount,loginPassword);
break;
case R.id.registerBtn:
String registerAddress="http://192.168.1.104:9977/Okhttptest/RegisterServlet?";
//http://电脑ip地址:tomcat端口号/java项目名/类名?
String registerAccount = loginAccount_etext.getText().toString();
String registerPassword = loginPassword_etext.getText().toString();
registerWithOkHttp(registerAddress,registerAccount,registerPassword);
break;
default:
break;
}
}
//实现登录
public void loginWithOkHttp(String address,String account,String password){
HttpUtil.loginWithOkHttp(address,account,password, new Callback() {
@Override
public void onFailure(Call call, IOException e) {
//在这里对异常情况进行处理
}
@Override
public void onResponse(Call call, Response response) throws IOException {
//得到服务器返回的具体内容
final String responseData = response.body().string();
runOnUiThread(new Runnable() {
@Override
public void run() {
if (responseData.equals("true")){
Toast.makeText(MainActivity.this,"登录成功",Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(MainActivity.this,"登录失败",Toast.LENGTH_SHORT).show();
}
}
});
}
});
}
//实现注册
public void registerWithOkHttp(String address,String account,String password){
HttpUtil.registerWithOkHttp(address, account, password, new Callback() {
@Override
public void onFailure(Call call, IOException e) {
//在这里对异常情况进行处理
}
@Override
public void onResponse(Call call, Response response) throws IOException {
final String responseData = response.body().string();
runOnUiThread(new Runnable() {
@Override
public void run() {
if (responseData.equals("true")){
Toast.makeText(MainActivity.this,"注册成功",Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(MainActivity.this,"注册失败",Toast.LENGTH_SHORT).show();
}
}
});
}
});
}
}
package com.example.okhttptest;
import okhttp3.FormBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
class HttpUtil {
//登录
static void loginWithOkHttp(String address,String account,String password,okhttp3.Callback callback){
OkHttpClient client = new OkHttpClient();
RequestBody body = new FormBody.Builder()
.add("loginAccount",account)
.add("loginPassword",password)
.build();
Request request = new Request.Builder()
.url(address)
.post(body)
.build();
client.newCall(request).enqueue(callback);
}
//注册
static void registerWithOkHttp(String address,String account,String password,okhttp3.Callback callback){
OkHttpClient client = new OkHttpClient();
RequestBody body = new FormBody.Builder()
.add("registerAccount",account)
.add("registerPassword",password)
.build();
Request request = new Request.Builder()
.url(address)
.post(body)
.build();
client.newCall(request).enqueue(callback);
}
}
根据自己的下载的版本为主
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>服务端已开启</h1>
</body>
</html>
package com.henuajy.Entity;
public class User {
private String loginAccount;
private String loginPassword;
public User(String loginAccount,String loginPassword){
this.loginAccount = loginAccount;
this.loginPassword = loginPassword;
}
public String getLoginAccount() {
return loginAccount;
}
public void setLoginAccount(String loginAccount) {
this.loginAccount = loginAccount;
}
public String getLoginPassword() {
return loginPassword;
}
public void setLoginPassword(String loginPassword) {
this.loginPassword = loginPassword;
}
}
package com.henuajy.Model;
import com.henuajy.Entity.User;
import java.sql.*;
public class LoginModel {
private static String DBUNAME = "root";
private static String DBUPWD = "1911411206";
//输入自己的mysql数据库的密码
private static String DRIVER = "com.mysql.cj.jdbc.Driver";
private static String URL = "jdbc:mysql://localhost:3306/lolbox?"
+ "serverTimezone=UTC"
+ "&useUnicode=true&characterEncoding=utf-8"
+ "&zeroDateTimeBehavior=convertToNull"
+ "&useSSL=false"
+ "&allowPublicKeyRetrieval=true";
/*URL="jdbc:mysql://localhost:3306/数据库名(?设置时区
/指定字符的编码、解码格式
/在 *** 作各项值均为0时，转化为null
/禁用SSL
/允许客户端从服务器获取公钥)"*/
public static boolean login(User user){
String loginAccount = user.getLoginAccount();
String loginPassword = user.getLoginPassword();
Connection con = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
int count = 0;
try{
Class.forName(DRIVER);
con = DriverManager.getConnection(URL,DBUNAME,DBUPWD);
pstmt = con.prepareStatement("select count(*)from userinfo where account=? and password=?");
pstmt.setString(1,loginAccount);
pstmt.setString(2,loginPassword);
rs = pstmt.executeQuery();
if (rs.next()){
count = rs.getInt(1);
System.out.println("链接成功");
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}finally {
try{
if (rs!=null){
rs.close();
}
if (pstmt!=null){
pstmt.close();
}
if (con!=null){
con.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
if (count==1){
return true;
}else{
return false;
}
}
}
public static boolean register(User user){
String loginAccount = user.getLoginAccount();
String loginPassword = user.getLoginPassword();
Connection con = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
int count = 0;
try{
Class.forName(DRIVER);
con = DriverManager.getConnection(URL,DBUNAME,DBUPWD);
pstmt = con.prepareStatement("insert into userinfo values (?,?)");
pstmt.setString(1,loginAccount);
pstmt.setString(2,loginPassword);
count = pstmt.executeUpdate();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}finally {
try{
if (rs!=null){
rs.close();
}
if (pstmt!=null){
pstmt.close();
}
if (con!=null){
con.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
if (count==1){
return true;
}else{
return false;
}
}
}
}
package com.henuajy.Servlet;
import com.henuajy.Entity.User;
import com.henuajy.Model.LoginModel;
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 java.io.IOException;
import java.io.PrintWriter;
@WebServlet(name = "LoginServlet",value = "/LoginServlet")
public class LoginServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
String loginAccount = request.getParameter("loginAccount");
String loginPassword = request.getParameter("loginPassword");
User user = new User(loginAccount,loginPassword);
boolean result = LoginModel.login(user);
System.out.println("登录账号："+loginAccount+",登陆密码："+loginPassword+",登录结果"+result);
response.setCharacterEncoding("UTF-8");
//通过PrintWriter返回给客户端 *** 作结果
PrintWriter writer = response.getWriter();
writer.print(result);
}
}
package com.henuajy.Servlet;
import com.henuajy.Entity.User;
import com.henuajy.Model.LoginModel;
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 java.io.IOException;
import java.io.PrintWriter;
@WebServlet(name = "RegisterServlet",value = "/RegisterServlet")
public class RegisterServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//request.setCharacterEncoding("utf-8");
String registerAccount = request.getParameter("registerAccount");
String registerPassword = request.getParameter("registerPassword");
User registerUser = new User(registerAccount,registerPassword);
boolean rs = LoginModel.register(registerUser);
System.out.println("注册账号："+registerAccount+",注册密码："+registerPassword+",注册结果"+rs);
//通过PrintWriter返回给客户端 *** 作结果
PrintWriter writer = response.getWriter();
writer.print(rs);
}
}
我参考的答案
java链接mysql的jar包PS：mysql最基础的是黑框版如下，可以下载可视化工具如Navicat等，也可以不下。
官网下载
电脑ip地址Windows+R输入cmd，输入ipconfig。如果是宽带联网就是以太网的IPv4 地址；如果是WiFi链接就是无线局域网的IPv4 地址
链接服务端时填写的端口号String loginAddress="http://192.168.1.104:9977/Okhttptest/LoginServlet?";
因为是Tomcat发布所以端口号要以这个为准，不一定是8080
如果发现有内容错误处，评论指出，教学相长，感激不尽。
有其他疑问，指出即讨论改正。
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