用户登陆功能实现，基本接口鉴权功能实现

src/main/java/com/yupi/springbootinit/service/impl/SystemUsersServiceImpl.java

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+package com.yupi.springbootinit.service.impl;
+
+import cn.hutool.crypto.SecureUtil;
+import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
+import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
+import com.yupi.springbootinit.model.entity.SystemUsers;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+
+import org.springframework.beans.factory.annotation.Autowired;
+
+import com.yupi.springbootinit.mapper.SystemUsersMapper;
+import com.yupi.springbootinit.service.SystemUsersService;
+
+import javax.annotation.Resource;
+/*
+* @author: ziin
+* @date: 2025/6/11 20:13
+*/
+    
+@Service
+public class SystemUsersServiceImpl extends ServiceImpl<SystemUsersMapper,SystemUsers> implements SystemUsersService{
+
+    @Value("${md5.salt}")
+    private String MD5_SALT;
+
+    @Override
+    public SystemUsers getUserByUserName(String username) {
+        QueryWrapper <SystemUsers> queryWrapper = new QueryWrapper<>();
+        queryWrapper.eq("username",username);
+        return baseMapper.selectOne(queryWrapper);
+    }
+
+    @Override
+    public boolean isPasswordMatch(String rawPassword, String encodedPassword) {
+        String s = SecureUtil.md5(MD5_SALT + rawPassword);
+        return s.equals(encodedPassword);
+    }
+}