1.1 安装redis

Windows 下 Redis 安装与配置 教程_redis windows-CSDN博客

2.1 引入redis坐标

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

2.2 配置redis信息

2.3 使用redis

2.3.1 在controller登录接口中设置值，在更改密码中删除值

package com.geji.controller;import com.geji.pojo.Result;
import com.geji.pojo.User;
import com.geji.service.UserService;
import com.geji.utils.JwtUtil;
import com.geji.utils.Md5Util;
import com.geji.utils.ThreadLocalUtil;
import jakarta.validation.constraints.Pattern;
import org.hibernate.validator.constraints.URL;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.util.StringUtils;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.*;import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;@RestController
@RequestMapping("/user")
@Validated
public class UserController {@Autowiredprivate UserService userService;@Autowiredprivate StringRedisTemplate stringRedisTemplate;@PostMapping("/register")public Result register(@Pattern(regexp = "^\\S{5,16}$") String username, @Pattern(regexp = "^\\S{5,16}$") String password) {//查询用户User u = userService.findByUserName(username);if (u == null) {//没有占用//注册userService.register(username, password);return Result.success();} else {//占用return Result.error("用户名已被占用");}}@PostMapping("/login")public Result<String> login(@Pattern(regexp = "^\\S{5,16}$") String username, @Pattern(regexp = "^\\S{5,16}$") String password) {//根据用户名查询用户User loginUser = userService.findByUserName(username);//判断该用户是否存在if (loginUser == null) {return Result.error("用户名错误");}//判断密码是否正确  loginUser对象中的password是密文if (Md5Util.getMD5String(password).equals(loginUser.getPassword())) {//登录成功Map<String, Object> claims = new HashMap<>();claims.put("id", loginUser.getId());claims.put("username", loginUser.getUsername());String token = JwtUtil.genToken(claims);//把token存储到redis中ValueOperations<String, String> operations = stringRedisTemplate.opsForValue();operations.set(token,token,1, TimeUnit.HOURS);return Result.success(token);}return Result.error("密码错误");}@GetMapping("/userInfo")public Result<User> userInfo() {Map<String, Object> map = ThreadLocalUtil.get();String username = (String) map.get("username");User user = userService.findByUserName(username);return Result.success(user);}@PutMapping("/update")public Result update(@RequestBody @Validated User user) {userService.update(user);return Result.success();}@PatchMapping("updateAvatar")public Result updateAvatar(@RequestParam @URL String avatarUrl) {userService.updateAvatar(avatarUrl);return Result.success();}@PatchMapping("/updatePwd")public Result updatePwd(@RequestBody Map<String, String> params,@RequestHeader("Authorization") String token) {//1.校验参数String oldPwd = params.get("old_pwd");String newPwd = params.get("new_pwd");String rePwd = params.get("re_pwd");if (!StringUtils.hasLength(oldPwd) || !StringUtils.hasLength(newPwd) || !StringUtils.hasLength(rePwd)) {return Result.error("缺少必要的参数");}//原密码是否正确//调用userService根据用户名拿到原密码,再和old_pwd比对Map<String,Object> map = ThreadLocalUtil.get();String username = (String) map.get("username");User loginUser = userService.findByUserName(username);if (!loginUser.getPassword().equals(Md5Util.getMD5String(oldPwd))){return Result.error("原密码填写不正确");}//newPwd和rePwd是否一样if (!rePwd.equals(newPwd)){return Result.error("两次填写的新密码不一样");}//2.调用service完成密码更新userService.updatePwd(newPwd);//删除redis中对应的tokenValueOperations<String, String> operations = stringRedisTemplate.opsForValue();operations.getOperations().delete(token);return Result.success();}
}

2.3.2 在拦截器中获取值，和用户携带的值对比，如果不存在就拦截

package com.geji.interceptors;import com.geji.pojo.Result;
import com.geji.utils.JwtUtil;
import com.geji.utils.ThreadLocalUtil;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;import java.util.Map;@Component
public class LoginInterceptor implements HandlerInterceptor {@Autowiredprivate StringRedisTemplate stringRedisTemplate;@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {//令牌验证String token = request.getHeader("Authorization");//验证tokentry{//从redis中获取相同的tokenValueOperations<String, String> operations = stringRedisTemplate.opsForValue();String redisToken = operations.get(token);if (redisToken==null){//token已经失效了throw new RuntimeException();}Map<String,Object> claims= JwtUtil.parseToken(token);//把业务数据存储到ThreadLocal中ThreadLocalUtil.set(claims);return true;}catch (Exception e){response.setStatus(401);return false;}}@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {//清空ThreadLocal中的数据ThreadLocalUtil.remove();}}