SpringBoot+Vue实现一个系统登录功能

1. 创建一个Spring Boot项目，添加Web和Security依赖。

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-security</artifactId>
</dependency>

2. 创建一个User实体类，用于存储用户信息。

public class User {
    private String username;
    private String password;
    // getter和setter方法
}

3. 创建一个UserDetailsService接口的实现类，用于加载用户信息。

@Service
public class UserDetailsServiceImpl implements UserDetailsService {
    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        // 从数据库或其他数据源获取用户信息
        User user = userRepository.findByUsername(username);
        if (user == null) {
            throw new UsernameNotFoundException("用户不存在");
        }
        return new org.springframework.security.core.userdetails.User(user.getUsername(), user.getPassword(), new ArrayList<>());
    }
}

4. 创建一个WebSecurityConfig类，继承WebSecurityConfigurerAdapter，并重写configure方法，配置SpringSecurity。

@Configuration
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
    @Autowired
    private UserDetailsService userDetailsService;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf().disable()
            .authorizeRequests()
            .antMatchers("/login").permitAll()
            .anyRequest().authenticated()
            .and()
            .formLogin()
            .loginPage("/login")
            .permitAll()
            .and()
            .logout()
            .permitAll();
    }

    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(userDetailsService).passwordEncoder(new BCryptPasswordEncoder());
    }
}

5. 在Vue项目中创建一个登录组件，包含用户名和密码输入框以及登录按钮。使用axios发送POST请求到SpringBoot后端的/login接口。

<template>
  <div>
    <input v-model="username" placeholder="用户名" />
    <input v-model="password" type="password" placeholder="密码" />
    <button @click="login">登录button>
  div>
template>

<script>
import axios from "axios";

export default {
  data() {
    return {
      username: "",
      password: "",
    };
  },
  methods: {
    async login() {
      try {
        const response = await axios.post("/login", {
          username: this.username,
          password: this.password,
        });
        if (response.data.success) {
          this.$router.push("/home");
        } else {
          alert("登录失败");
        }
      } catch (error) {
        console.error(error);
      }
    },
  },
};
script>

6. 在Spring Boot后端的Controller中处理登录请求，验证用户名和密码是否正确，返回相应的响应。

@RestController
public class LoginController {
    @Autowired
    private UserRepository userRepository;

    @PostMapping("/login")
    public ResponseEntity<?> login(@RequestBody User user) {
        User dbUser = userRepository.findByUsername(user.getUsername());
        if (dbUser != null && bcrypt.checkpw(user.getPassword().toCharArray(), dbUser.getPassword().toCharArray())) {
            return ResponseEntity.ok("登录成功");
        } else {
            return ResponseEntity.status(HttpStatus.UNAUTHORIZED).body("用户名或密码错误");
        }
    }
}

7. 运行Spring Boot项目和Vue项目，测试登录功能。