Java实现第三方登录案例

wen java案例 2026-08-04 143

本文目录导读：

Java实现第三方登录案例

项目结构
Maven依赖配置 (pom.xml)
配置文件 (application.yml)
配置类
实体类
JWT工具类
OAuth服务层
用户服务层
控制器
安全配置
主应用类
前端示例 (HTML)
SQL脚本
GitHub OAuth应用配置
使用说明
扩展其他平台

我将为您提供一个完整的Java第三方登录实现案例,以GitHub登录为例进行说明。

项目结构

third-party-login-demo/
├── pom.xml
├── src/main/java/com/example/oauth/
│   ├── controller/
│   │   └── OAuthController.java
│   ├── config/
│   │   └── OAuthConfig.java
│   ├── service/
│   │   ├── GitHubOAuthService.java
│   │   └── UserService.java
│   ├── model/
│   │   ├── GitHubUser.java
│   │   └── AuthToken.java
│   └── util/
│       └── JwtUtil.java
├── src/main/resources/
│   └── application.yml

Maven依赖配置 (pom.xml)

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
         http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.example</groupId>
    <artifactId>third-party-login</artifactId>
    <version>1.0.0</version>
    <packaging>jar</packaging>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.0</version>
    </parent>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <!-- Spring Web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- Spring Data JPA -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <!-- MySQL驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.33</version>
        </dependency>
        <!-- JWT -->
        <dependency>
            <groupId>io.jsonwebtoken</groupId>
            <artifactId>jjwt-api</artifactId>
            <version>0.11.5</version>
        </dependency>
        <dependency>
            <groupId>io.jsonwebtoken</groupId>
            <artifactId>jjwt-impl</artifactId>
            <version>0.11.5</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>io.jsonwebtoken</groupId>
            <artifactId>jjwt-jackson</artifactId>
            <version>0.11.5</version>
            <scope>runtime</scope>
        </dependency>
        <!-- Spring Security -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <!-- Lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <!-- HTTP Client -->
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.14</version>
        </dependency>
    </dependencies>
</project>

配置文件 (application.yml)

server:
  port: 8080
spring:
  datasource:
    url: jdbc:mysql://localhost:3306/oauth_demo?useSSL=false&serverTimezone=UTC
    username: root
    password: root
    driver-class-name: com.mysql.cj.jdbc.Driver
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true
    properties:
      hibernate:
        dialect: org.hibernate.dialect.MySQL8Dialect
oauth:
  github:
    client-id: your-github-client-id
    client-secret: your-github-client-secret
    redirect-uri: http://localhost:8080/oauth/github/callback
    authorize-url: https://github.com/login/oauth/authorize
    token-url: https://github.com/login/oauth/access_token
    user-url: https://api.github.com/user
jwt:
  secret: your-secret-key-at-least-256-bits-long-for-hs256
  expiration: 86400000  # 24小时
app:
  frontend-callback: http://localhost:3000/oauth/callback

配置类

package com.example.oauth.config;
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
@Data
@Configuration
@ConfigurationProperties(prefix = "oauth.github")
public class GitHubOAuthConfig {
    private String clientId;
    private String clientSecret;
    private String redirectUri;
    private String authorizeUrl;
    private String tokenUrl;
    private String userUrl;
}

package com.example.oauth.config;
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
@Data
@Configuration
@ConfigurationProperties(prefix = "jwt")
public class JwtConfig {
    private String secret;
    private long expiration;
}

实体类

package com.example.oauth.model;
import lombok.Data;
import javax.persistence.*;
import java.time.LocalDateTime;
@Data
@Entity
@Table(name = "users")
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    @Column(unique = true)
    private String email;
    private String username;
    private String avatarUrl;
    @Column(name = "provider")
    private String provider;  // github, google, etc
    @Column(name = "provider_id", unique = true)
    private String providerId;
    @Column(name = "access_token")
    private String accessToken;
    @Column(name = "created_at")
    private LocalDateTime createdAt;
    @Column(name = "last_login")
    private LocalDateTime lastLogin;
    @PrePersist
    protected void onCreate() {
        createdAt = LocalDateTime.now();
    }
}

JWT工具类

package com.example.oauth.util;
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import io.jsonwebtoken.security.Keys;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import javax.crypto.SecretKey;
import java.nio.charset.StandardCharsets;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
@Component
public class JwtUtil {
    @Value("${jwt.secret}")
    private String secret;
    @Value("${jwt.expiration}")
    private long expiration;
    private SecretKey getSigningKey() {
        byte[] keyBytes = secret.getBytes(StandardCharsets.UTF_8);
        return Keys.hmacShaKeyFor(keyBytes);
    }
    public String generateToken(Long userId, String username, String provider) {
        Date now = new Date();
        Date expiryDate = new Date(now.getTime() + expiration);
        Map<String, Object> claims = new HashMap<>();
        claims.put("userId", userId);
        claims.put("username", username);
        claims.put("provider", provider);
        return Jwts.builder()
                .setClaims(claims)
                .setSubject(username)
                .setIssuedAt(now)
                .setExpiration(expiryDate)
                .signWith(getSigningKey(), SignatureAlgorithm.HS256)
                .compact();
    }
    public Claims parseToken(String token) {
        return Jwts.parserBuilder()
                .setSigningKey(getSigningKey())
                .build()
                .parseClaimsJws(token)
                .getBody();
    }
    public boolean validateToken(String token) {
        try {
            Jwts.parserBuilder()
                .setSigningKey(getSigningKey())
                .build()
                .parseClaimsJws(token);
            return true;
        } catch (Exception e) {
            return false;
        }
    }
}

OAuth服务层

package com.example.oauth.service;
import com.example.oauth.config.GitHubOAuthConfig;
import com.example.oauth.model.GitHubUser;
import com.example.oauth.model.User;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.*;
import org.springframework.stereotype.Service;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;
@Service
public class GitHubOAuthService {
    @Autowired
    private GitHubOAuthConfig config;
    @Autowired
    private UserService userService;
    private final RestTemplate restTemplate = new RestTemplate();
    private final ObjectMapper objectMapper = new ObjectMapper();
    /**
     * 获取授权URL
     */
    public String getAuthorizationUrl() {
        return config.getAuthorizeUrl() + "?client_id=" + config.getClientId() 
               + "&redirect_uri=" + config.getRedirectUri()
               + "&scope=user:email";
    }
    /**
     * 获取访问令牌
     */
    public String getAccessToken(String code) {
        String tokenUrl = config.getTokenUrl();
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
        headers.setAccept(java.util.Collections.singletonList(MediaType.APPLICATION_JSON));
        MultiValueMap<String, String> body = new LinkedMultiValueMap<>();
        body.add("client_id", config.getClientId());
        body.add("client_secret", config.getClientSecret());
        body.add("code", code);
        body.add("redirect_uri", config.getRedirectUri());
        HttpEntity<MultiValueMap<String, String>> request = new HttpEntity<>(body, headers);
        ResponseEntity<String> response = restTemplate.postForEntity(tokenUrl, request, String.class);
        try {
            JsonNode jsonNode = objectMapper.readTree(response.getBody());
            return jsonNode.get("access_token").asText();
        } catch (Exception e) {
            throw new RuntimeException("Failed to get access token", e);
        }
    }
    /**
     * 获取GitHub用户信息
     */
    public GitHubUser getGitHubUser(String accessToken) {
        HttpHeaders headers = new HttpHeaders();
        headers.setBearerAuth(accessToken);
        headers.setAccept(java.util.Collections.singletonList(MediaType.APPLICATION_JSON));
        HttpEntity<String> entity = new HttpEntity<>(headers);
        ResponseEntity<GitHubUser> response = restTemplate.exchange(
            config.getUserUrl(),
            HttpMethod.GET,
            entity,
            GitHubUser.class
        );
        return response.getBody();
    }
    /**
     * 处理GitHub OAuth回调
     */
    public User handleOAuthCallback(String code) {
        // 获取访问令牌
        String accessToken = getAccessToken(code);
        // 获取GitHub用户信息
        GitHubUser githubUser = getGitHubUser(accessToken);
        // 查找或创建用户
        User user = userService.findOrCreateUser(githubUser, accessToken);
        return user;
    }
}

package com.example.oauth.model;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import lombok.Data;
@Data
@JsonIgnoreProperties(ignoreUnknown = true)
public class GitHubUser {
    private Long id;
    private String login;
    private String name;
    private String email;
    private String avatarUrl;
    private String bio;
}

用户服务层

package com.example.oauth.service;
import com.example.oauth.model.GitHubUser;
import com.example.oauth.model.User;
import com.example.oauth.repository.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.time.LocalDateTime;
import java.util.Optional;
@Service
public class UserService {
    @Autowired
    private UserRepository userRepository;
    /**
     * 查找或创建GitHub用户
     */
    public User findOrCreateUser(GitHubUser githubUser, String accessToken) {
        Optional<User> existingUser = userRepository.findByProviderId(String.valueOf(githubUser.getId()));
        User user;
        if (existingUser.isPresent()) {
            user = existingUser.get();
            // 更新用户信息
            user.setUsername(githubUser.getLogin() != null ? githubUser.getLogin() : githubUser.getName());
            user.setAvatarUrl(githubUser.getAvatarUrl());
            user.setAccessToken(accessToken);
            user.setLastLogin(LocalDateTime.now());
        } else {
            // 创建新用户
            user = new User();
            user.setProvider("github");
            user.setProviderId(String.valueOf(githubUser.getId()));
            user.setUsername(githubUser.getLogin() != null ? githubUser.getLogin() : githubUser.getName());
            user.setEmail(githubUser.getEmail());
            user.setAvatarUrl(githubUser.getAvatarUrl());
            user.setAccessToken(accessToken);
            user.setLastLogin(LocalDateTime.now());
        }
        return userRepository.save(user);
    }
    /**
     * 通过ID查找用户
     */
    public Optional<User> findById(Long id) {
        return userRepository.findById(id);
    }
}

package com.example.oauth.repository;
import com.example.oauth.model.User;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
import java.util.Optional;
@Repository
public interface UserRepository extends JpaRepository<User, Long> {
    Optional<User> findByProviderId(String providerId);
    Optional<User> findByEmail(String email);
}

控制器

package com.example.oauth.controller;
import com.example.oauth.model.User;
import com.example.oauth.service.GitHubOAuthService;
import com.example.oauth.util.JwtUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
@RestController
@RequestMapping("/oauth")
public class OAuthController {
    @Autowired
    private GitHubOAuthService gitHubOAuthService;
    @Autowired
    private JwtUtil jwtUtil;
    @Value("${app.frontend-callback}")
    private String frontendCallback;
    /**
     * 发起GitHub登录
     */
    @GetMapping("/github/login")
    public void githubLogin(HttpServletResponse response) throws IOException {
        String authorizationUrl = gitHubOAuthService.getAuthorizationUrl();
        response.sendRedirect(authorizationUrl);
    }
    /**
     * GitHub回调
     */
    @GetMapping("/github/callback")
    public ResponseEntity<?> githubCallback(
            @RequestParam(value = "code") String code,
            @RequestParam(value = "state", required = false) String state,
            HttpServletResponse response) throws IOException {
        try {
            // 处理OAuth回调
            User user = gitHubOAuthService.handleOAuthCallback(code);
            // 生成JWT令牌
            String token = jwtUtil.generateToken(user.getId(), user.getUsername(), user.getProvider());
            // 构建响应数据
            Map<String, Object> authResponse = new HashMap<>();
            authResponse.put("token", token);
            authResponse.put("userId", user.getId());
            authResponse.put("username", user.getUsername());
            authResponse.put("avatarUrl", user.getAvatarUrl());
            authResponse.put("provider", user.getProvider());
            // 重定向到前端并携带token
            String redirectUrl = frontendCallback + "?token=" + token 
                    + "&userId=" + user.getId()
                    + "&username=" + user.getUsername();
            response.sendRedirect(redirectUrl);
            return null; // 已经重定向
        } catch (Exception e) {
            e.printStackTrace();
            response.sendRedirect(frontendCallback + "?error=authentication_failed");
            return null;
        }
    }
    /**
     * 获取当前用户信息
     */
    @GetMapping("/user/info")
    public ResponseEntity<?> getUserInfo(@RequestHeader("Authorization") String authorization) {
        try {
            String token = authorization.replace("Bearer ", "");
            if (jwtUtil.validateToken(token)) {
                org.springframework.security.core.userdetails.User user = 
                    org.springframework.security.core.userdetails.User
                    .withUsername("placeholder")
                    .password("")
                    .roles("USER")
                    .build();
                Map<String, Object> response = new HashMap<>();
                response.put("valid", true);
                response.put("tokenInfo", jwtUtil.parseToken(token));
                return ResponseEntity.ok(response);
            } else {
                return ResponseEntity.status(401).body("Invalid token");
            }
        } catch (Exception e) {
            return ResponseEntity.status(401).body("Invalid token");
        }
    }
}

安全配置

package com.example.oauth.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.CorsConfigurationSource;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import java.util.Arrays;
@Configuration
@EnableWebSecurity
public class SecurityConfig {
    @Bean
    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
        http
            .csrf().disable()
            .cors().and()
            .sessionManagement()
            .sessionCreationPolicy(SessionCreationPolicy.STATELESS)
            .and()
            .authorizeRequests()
            .antMatchers("/oauth/github/login", "/oauth/github/callback").permitAll()
            .anyRequest().authenticated()
            .and()
            .httpBasic()
            .and()
            .formLogin().disable();
        return http.build();
    }
    @Bean
    public CorsConfigurationSource corsConfigurationSource() {
        CorsConfiguration configuration = new CorsConfiguration();
        configuration.setAllowedOrigins(Arrays.asList("http://localhost:3000"));
        configuration.setAllowedMethods(Arrays.asList("GET", "POST", "PUT", "DELETE", "OPTIONS"));
        configuration.setAllowedHeaders(Arrays.asList("Authorization", "Content-Type"));
        configuration.setAllowCredentials(true);
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", configuration);
        return source;
    }
}

主应用类

package com.example.oauth;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
@SpringBootApplication
@EnableConfigurationProperties
public class OAuthApplication {
    public static void main(String[] args) {
        SpringApplication.run(OAuthApplication.class, args);
    }
}

前端示例 (HTML)

<!DOCTYPE html>
<html>
<head>OAuth Login Demo</title>
</head>
<body>
    <h1>第三方登录示例</h1>
    <button onclick="loginWithGitHub()">使用GitHub登录</button>
    <div id="userInfo" style="display: none;">
        <h2>用户信息</h2>
        <p>用户名: <span id="username"></span></p>
        <img id="avatar" width="100" height="100"/>
    </div>
    <script>
        // 获取URL参数
        function getUrlParam(name) {
            const url = new URL(window.location.href);
            return url.searchParams.get(name);
        }
        // 登录函数
        function loginWithGitHub() {
            window.location.href = 'http://localhost:8080/oauth/github/login';
        }
        // 处理登录回调
        window.onload = function() {
            const token = getUrlParam('token');
            const username = getUrlParam('username');
            if (token && username) {
                document.getElementById('username').textContent = username;
                document.getElementById('userInfo').style.display = 'block';
                // 存储token
                localStorage.setItem('auth_token', token);
                // 获取完整用户信息
                fetchUserInfo(token);
                // 清理URL参数
                window.history.replaceState({}, document.title, window.location.pathname);
            }
        };
        // 获取用户详细信息
        async function fetchUserInfo(token) {
            try {
                const response = await fetch('http://localhost:8080/oauth/user/info', {
                    headers: {
                        'Authorization': `Bearer ${token}`
                    }
                });
                const userData = await response.json();
                console.log('User data:', userData);
            } catch (error) {
                console.error('Error fetching user info:', error);
            }
        }
    </script>
</body>
</html>

SQL脚本

-- 创建数据库
CREATE DATABASE IF NOT EXISTS oauth_demo DEFAULT CHARACTER SET utf8mb4;
USE oauth_demo;
-- 用户表
CREATE TABLE IF NOT EXISTS users (
    id BIGINT AUTO_INCREMENT PRIMARY KEY,
    email VARCHAR(255),
    username VARCHAR(255),
    avatar_url VARCHAR(500),
    provider VARCHAR(50),
    provider_id VARCHAR(100),
    access_token TEXT,
    created_at DATETIME,
    last_login DATETIME,
    UNIQUE KEY uk_provider_id (provider_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

GitHub OAuth应用配置

登录GitHub
进入 Settings → Developer settings → OAuth Apps
点击 "New OAuth App"
填写配置：
- Application name: 你的应用名称
- Homepage URL: http://localhost:8080
- Authorization callback URL: http://localhost:8080/oauth/github/callback
获取 Client ID 和 Client Secret

使用说明

获取GitHub OAuth凭据：在GitHub开发者设置中创建OAuth应用，获取Client ID和Client Secret。
配置应用：更新application.yml中的GitHub凭据。
运行数据库：启动MySQL,执行SQL脚本。
启动应用：运行OAuthApplication主类。
测试流程：
- 访问前端页面
- 点击"使用GitHub登录"
- 跳转到GitHub授权页面
- 授权后回调到我们的应用
- 应用创建用户并返回JWT令牌

扩展其他平台

按类似方式可以扩展Google、微信等平台的登录：

public interface OAuthService {
    String getAuthorizationUrl();
    String getAccessToken(String code);
    Object getUserInfo(String accessToken);
    User handleOAuthCallback(String code);
}
// Google OAuth Service 实现示例
@Service
public class GoogleOAuthService implements OAuthService {
    // 实现gooogle OAuth逻辑
}

这个案例提供了完整的GitHub第三方登录实现，包括OAuth授权流程、用户管理、JWT生成验证等核心功能,可以根据需要扩展其他平台的支持。

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