登陆接口实现返回token

自定义登陆接口，然后让SpringSecurity对这个接口放行,让用户访问这个接口的时候不用登录也能访问。

在接口中我们通过AuthenticationManager的authenticate方法来进行用户认证,所以需要在SecurityConfig中配置把AuthenticationManager注入容器。

认证成功的话要生成一个jwt，放入响应中返回。并且为了让用户下回请求时能通过jwt识别出具体的是哪个用户，我们需要把用户信息存入redis，可以把用户id作为key。

@RestController
public class LoginController {

    @Autowired
    private LoginServcie loginServcie;

    @PostMapping("/user/login")
    public ResponseResult login(@RequestBody User user){
        return loginServcie.login(user);
    }
}

@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {


    @Bean
    public PasswordEncoder passwordEncoder(){
        return new BCryptPasswordEncoder();
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
                //关闭csrf
                .csrf().disable()
                //不通过Session获取SecurityContext
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and()
                .authorizeRequests()
                // 对于登录接口 允许匿名访问
                .antMatchers("/user/login").anonymous()
                // 除上面外的所有请求全部需要鉴权认证
                .anyRequest().authenticated();
    }

    @Bean
    @Override
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }
}

LoginService 

package com.security.service;

import com.security.domain.ResponseResult;
import com.security.domain.User;

public interface LoginService {

    ResponseResult login(User user);
}

LoginServiceImpl 

package com.security.service.impl;

import com.security.domain.LoginUser;
import com.security.domain.ResponseResult;
import com.security.domain.User;
import com.security.service.LoginService;
import com.security.utils.JwtUtil;
import com.security.utils.RedisCache;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.stereotype.Service;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;

@Service
public class LoginServiceImpl implements LoginService {

    @Autowired
    private AuthenticationManager authenticationManager;
    @Autowired
    private RedisCache redisCache;

    @Override
    public ResponseResult login(User user) {
        //AuthenticationManager authenticationManager进行用户认证
        UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(user.getUserName(),user.getPassword());
        Authentication authenticate = authenticationManager.authenticate(authenticationToken);
        //如果认证没通过，给出对应的提示
        if(Objects.isNull(authenticate)){
            throw new RuntimeException("登录失败");
        }
        //如果认证通过，使用userid生成一个jwt
        LoginUser loginUser = (LoginUser) authenticate.getPrincipal();
        String userId = loginUser.getUser().getId().toString();
        String jwt = JwtUtil.createJWT(userId);
        Map<String,String> map = new HashMap<>();
        map.put("token", jwt);
        //把完整的用户信息存入redis，userid作为key
        redisCache.setCacheObject("login:"+userId,loginUser);
        return new ResponseResult(200,"登录成功",map);
    }
}