Java基于Session登录验证的实现示例

package com.ukefu.characterglm.controller;

import cn.hutool.crypto.SecureUtil;
import com.ukefu.characterglm.entity.User;
import com.ukefu.characterglm.service.UserService;
import com.ukefu.characterglm.utils.BaseResponse;
import com.ukefu.characterglm.utils.ErrorCode;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpSession;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.HashMap;
import java.util.Map;

/**
 * @author Luke Ewin
 * @date 2024/2/4 14:07
 * @blog blog.lukeewin.top
 */
@RestController
@RequestMapping("/user")
public class UserController {

    @Autowired
    private UserService userService;

    @PostMapping("/login")
    public BaseResponse login(HttpServletRequest request, @RequestBody User user) {
        if (user != null && StringUtils.isNotBlank(user.getName()) && StringUtils.isNotBlank(user.getPassword())) {
            String name = user.getName();
            String password = user.getPassword();

            User tempUser = userService.login(name, SecureUtil.md5(password));
            if (tempUser != null) {
                Map<String, String> map = new HashMap<>();
                map.put("id", String.valueOf(tempUser.getId()));
                map.put("name", tempUser.getName());
                map.put("email", tempUser.getEmail());
                map.put("phone", tempUser.getPhone());
                // 保存用户的登录状态
                HttpSession session = request.getSession();
                session.setAttribute("user", tempUser);
                return BaseResponse.success(map);
            } else {
                return BaseResponse.error(ErrorCode.USERNAME_PASSWORD_ERROR);
            }
        }
        return BaseResponse.error(ErrorCode.MISS_PARAMS);
    }
}

public class LoginInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HttpSession session = request.getSession();
        Object user = session.getAttribute("user");
        if (user != null) {
            return true;
        }
        request.getRequestDispatcher("/error/login").forward(request, response);
        return false;
    }
}

@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/**").excludePathPatterns("/user/login", "/error/**");
    }
}