【SpringBoot实战篇】获取用户详细信息-ThreadLocal优化

news/2024/9/24 9:21:20/

1 分析问题

对token的解析当初在拦截器中已经写过。期待的是在拦截器里写了，在其他地方就不写了，应该去复用拦截器里面得到的结果

2 解决方式-ThreadLocal

2.1提供线程局部变量

用来存取数据: set()/get()
使用ThreadLocal存储的数据, 线程安全

2.2过程图解

2.3代码实现

工具类

package com.aaa.utils;import java.util.HashMap;
import java.util.Map;/*** ThreadLocal 工具类*/
@SuppressWarnings("all")
public class ThreadLocalUtil {//提供ThreadLocal对象,private static final ThreadLocal THREAD_LOCAL = new ThreadLocal();//根据键获取值public static <T> T get(){return (T) THREAD_LOCAL.get();}//存储键值对public static void set(Object value){THREAD_LOCAL.set(value);}//清除ThreadLocal 防止内存泄漏public static void remove(){THREAD_LOCAL.remove();}
}

拦截器

package com.aaa.interceptors;import com.aaa.pojo.Result; //统一返回结果
import com.aaa.utils.JwtUtil;//token令牌
import com.aaa.utils.ThreadLocalUtil;//线程
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 {Map<String, Object> claims = JwtUtil.parseToken(token);//把业务数据存储到ThreadLocal中ThreadLocalUtil.set(claims);//放行return true;} catch (Exception e) {//http响应状态码为401response.setStatus(401);//不放行return false;}}@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {//清空ThreadLocal中的数据ThreadLocalUtil.remove();}
}

控制器

    @GetMapping("/userInfo")public Result<User> userInfo(/*@RequestHeader(name = "Authorization") String token*/) {//根据用户名查询用户/* Map<String, Object> map = JwtUtil.parseToken(token);String username = (String) map.get("username");*/Map<String, Object> map = ThreadLocalUtil.get();String username = (String) map.get("username");User user = userService.findByUserName(username);return Result.success(user);}