1、CrosFilter

package com.csdn.headline.filters;
import jakarta.servlet.*;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
public class CrosFilter implements Filter {/*** 过滤器方法，用于处理HTTP请求* @param servletRequest  Servlet请求对象* @param servletResponse Servlet响应对象* @param filterChain     过滤器链* @throws IOException      如果发生IO异常* @throws ServletException 如果发生Servlet异常*/@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {// 将响应对象转换为HttpServletResponse类型HttpServletResponse response = (HttpServletResponse) servletResponse;// 设置Access-Control-Allow-Origin头部字段为"*"，表示允许所有来源访问response.setHeader("Access-Control-Allow-Origin", "*");// 设置Access-Control-Allow-Methods头部字段为"POST, GET, OPTIONS, DELETE, HEAD"，表示支持的请求方法response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, HEAD");// 设置Access-Control-Max-Age头部字段为"3600"，表示预检请求的最大缓存时间response.setHeader("Access-Control-Max-Age", "3600");// 设置Access-Control-Allow-Headers头部字段为"access-control-allow-origin, authority, content-type, version-info, X-Requested-With"，表示支持的请求头response.setHeader("Access-Control-Allow-Headers", "access-control-allow-origin, authority, content-type, version-info, X-Requested-With");// 调用过滤器链的doFilter方法，将请求和响应对象传入filterChain.doFilter(servletRequest, servletResponse);}
}

2、NewsUserController

package com.csdn.headline.controller;
import com.csdn.headline.common.Result;
import com.csdn.headline.common.ResultCodeEnum;
import com.csdn.headline.pojo.NewsUser;
import com.csdn.headline.service.NewsUserService;
import com.csdn.headline.util.MD5Util;
import com.csdn.mymvc.annotation.*;
@Controller
@RequestMapping("/user")
public class NewsUserController {@Autowireprivate NewsUserService newsUserService;/*** 登录方法* @param newsUser 用户信息* @return 登录结果*/@PostMapping("/login")public Result<NewsUser> login(@RequestBody NewsUser newsUser) {// 根据用户名从数据库中获取用户信息NewsUser newsUserFromDB = newsUserService.getNewsUserByUserName(newsUser.getUsername());// 如果数据库中没有找到对应用户名的用户信息，则返回登录失败的结果if (newsUserFromDB == null) {return Result.build(null, ResultCodeEnum.USERNAME_ERROR);} else {// 获取数据库中用户密码String pwdFromDB = newsUserFromDB.getUserPwd();// 对输入的密码进行加密String yourPwd = MD5Util.encrypt(newsUser.getUserPwd());// 如果加密后的密码与数据库中的密码不一致，则返回登录失败的结果if (!yourPwd.equals(pwdFromDB)) {return Result.build(null, ResultCodeEnum.PASSWORD_ERROR);} else {// 清空数据库中用户的密码，完成登录并返回用户信息newsUserFromDB.setUserPwd(null);return Result.ok(newsUserFromDB);}}}
}

3、NewsUserServiceImpl

package com.csdn.headline.service.impl;
import com.csdn.headline.dao.NewsUserDao;
import com.csdn.headline.pojo.NewsUser;
import com.csdn.headline.service.NewsUserService;
import com.csdn.mymvc.annotation.Autowire;
import com.csdn.mymvc.annotation.Service;
@Service
public class NewsUserServiceImpl implements NewsUserService {@Autowireprivate NewsUserDao newsUserDao;/*** 根据用户名获取对应的NewsUser对象* @param userName 用户名* @return 对应的NewsUser对象*/@Overridepublic NewsUser getNewsUserByUserName(String userName) {return newsUserDao.getNewsUserByUserName(userName);}
}

4、NewsUserDaoImpl

package com.csdn.headline.dao.impl;
import com.csdn.headline.dao.NewsUserDao;
import com.csdn.headline.pojo.NewsUser;
import com.csdn.mymvc.annotation.Repository;
import com.csdn.mymvc.dao.BaseDao;
@Repository
public class NewsUserDaoImpl extends BaseDao<NewsUser> implements NewsUserDao {@Overridepublic NewsUser getNewsUserByUserName(String userName) {// 根据用户名查询对应的NewsUser对象String sql = "select uid,username,user_pwd as userPwd,nick_name as nickName from news_user where username =?";return load(sql, userName);}
}