redis分布式锁（基于注解形势）。
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sxq
疯狂的狮子li
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package com.ruoyi.web.controller.system;
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import com.ruoyi.common.annotation.RedisLock;
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import com.ruoyi.common.core.domain.AjaxResult;
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import com.ruoyi.common.core.domain.entity.SysUser;
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import com.ruoyi.common.core.domain.model.LoginBody;
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import com.ruoyi.common.core.domain.model.LoginUser;
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import com.ruoyi.common.utils.ServletUtils;
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import com.ruoyi.framework.web.service.TokenService;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.RequestBody;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RestController;
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/**
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* 测试分布式锁的样例
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*/
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@RestController
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@RequestMapping("/system/redisLock")
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public class RedisLockController {
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@Autowired
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private TokenService tokenService;
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/**
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* #p0 标识取第一个参数为redis锁的key
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* @param loginBody
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* @return
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*/
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@GetMapping("/getLock")
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@RedisLock(expireTime=10,key = "#p0")
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public AjaxResult getInfo(@RequestBody LoginBody loginBody){
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LoginUser loginUser = tokenService.getLoginUser(ServletUtils.getRequest());
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SysUser user = loginUser.getUser();
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try {
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Thread.sleep(5000);
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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return AjaxResult.success(user);
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}
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}
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package com.ruoyi.common.annotation;
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import java.lang.annotation.ElementType;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.lang.annotation.Target;
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/**
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* 分布式锁（注解模式，不推荐使用，最好用锁的工具类）
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*/
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@Target({ElementType.METHOD})
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@Retention(RetentionPolicy.RUNTIME)
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public @interface RedisLock {
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/**
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* 锁过期时间
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* @return
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*/
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int expireTime() default 30;//30秒
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/**
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* 锁key值
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* @return
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*/
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String key() default "redisLockKey";
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}
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package com.ruoyi.common.core.redis;
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import com.ruoyi.common.annotation.RedisLock;
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import com.ruoyi.common.utils.file.ImageUtils;
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import org.aspectj.lang.ProceedingJoinPoint;
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import org.aspectj.lang.annotation.Around;
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import org.aspectj.lang.annotation.Aspect;
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import org.aspectj.lang.annotation.Pointcut;
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import org.aspectj.lang.reflect.MethodSignature;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.core.annotation.Order;
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import org.springframework.stereotype.Component;
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import java.lang.reflect.Method;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.concurrent.TimeUnit;
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/**
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* 分布式锁（注解实现版本）
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*/
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@Component
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@Aspect
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@Order(9)
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public class RedisLockAspect {
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@Autowired
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private RedisLockUtil redisUtil;
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private static final Logger log = LoggerFactory.getLogger(RedisLockAspect.class);
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@Pointcut("@annotation(com.ruoyi.common.annotation.RedisLock)")
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public void annotationPointcut() {
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}
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@Around("annotationPointcut()")
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public Object doAround(ProceedingJoinPoint joinPoint) throws Throwable {
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// 获得当前访问的class
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Class<?> className = joinPoint.getTarget().getClass();
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// 获得访问的方法名
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String methodName = joinPoint.getSignature().getName();
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// 得到方法的参数的类型
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Class<?>[] argClass = ((MethodSignature) joinPoint.getSignature()).getParameterTypes();
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Object[] args = joinPoint.getArgs();
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String key = "";
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// 默认30秒过期时间
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int expireTime = 30;
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try {
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// 得到访问的方法对象
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Method method = className.getMethod(methodName, argClass);
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method.setAccessible(true);
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// 判断是否存在@RedisLock注解
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if (method.isAnnotationPresent(RedisLock.class)) {
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RedisLock annotation = method.getAnnotation(RedisLock.class);
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key = getRedisKey(args, annotation.key());
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expireTime = getExpireTime(annotation);
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}
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} catch (Exception e) {
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throw new RuntimeException("redis分布式锁注解参数异常", e);
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}
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Object res = new Object();
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if (redisUtil.acquire(key, expireTime, TimeUnit.SECONDS)) {
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try {
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res = joinPoint.proceed();
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return res;
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} catch (Exception e) {
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throw new RuntimeException(e);
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} finally {
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redisUtil.release(key);
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}
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}else {
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throw new RuntimeException("redis分布式锁注解参数异常");
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}
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}
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private int getExpireTime(RedisLock annotation) {
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return annotation.expireTime();
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}
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private String getRedisKey(Object[] args, String primalKey) {
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if (args.length == 0) {
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return primalKey;
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}
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// 获取#p0...集合
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List<String> keyList = getKeyParsList(primalKey);
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for (String keyName : keyList) {
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int keyIndex = Integer.parseInt(keyName.toLowerCase().replace("#p", ""));
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Object parValue = args[keyIndex];
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primalKey = primalKey.replace(keyName, String.valueOf(parValue));
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}
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return primalKey.replace("+", "").replace("'", "");
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}
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/**
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* 获取key中#p0中的参数名称
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*
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* @param key
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* @return
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*/
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private static List<String> getKeyParsList(String key) {
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List<String> listPar = new ArrayList<>();
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if (key.contains("#")) {
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int plusIndex = key.substring(key.indexOf("#")).indexOf("+");
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int indexNext = 0;
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String parName;
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int indexPre = key.indexOf("#");
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if (plusIndex > 0) {
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indexNext = key.indexOf("#") + key.substring(key.indexOf("#")).indexOf("+");
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parName = key.substring(indexPre, indexNext);
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} else {
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parName = key.substring(indexPre);
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}
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listPar.add(parName.trim());
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key = key.substring(indexNext + 1);
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if (key.contains("#")) {
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listPar.addAll(getKeyParsList(key));
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}
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}
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return listPar;
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}
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}
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package com.ruoyi.common.core.redis;
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import org.redisson.api.RLock;
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import org.redisson.api.RedissonClient;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Component;
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import java.util.concurrent.TimeUnit;
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@Component
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public class RedisLockUtil {
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@Autowired
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private RedissonClient redissonClient;
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private static final String LOCK_TITLE = "redisLock_";
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private static final Logger log = LoggerFactory.getLogger(RedisLockUtil.class);
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/* public boolean getLock(String key){
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key = LOCK_TITLE + key;
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RLock mylock = redissonClient.getLock(key);
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System.err.println("======lock======" + Thread.currentThread().getName());
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return true;
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}*/
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/**
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* 加锁 （RLock）带超时时间的
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* @param key
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* @param expire
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* @param expireUnit
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* @return
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*/
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public boolean acquire(String key, long expire, TimeUnit expireUnit) {
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//声明key对象
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key = LOCK_TITLE + key;
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//获取锁对象
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RLock mylock = redissonClient.getLock(key);
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//加锁，并且设置锁过期时间，防止死锁的产生
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try {
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mylock.tryLock(expire,expire,expireUnit);
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} catch (InterruptedException e) {
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e.getMessage();
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return false;
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}
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System.err.println("======lock======" + Thread.currentThread().getName());
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//加锁成功
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return true;
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}
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//锁的释放
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public void release(String lockName) {
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//必须是和加锁时的同一个key
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String key = LOCK_TITLE + lockName;
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//获取所对象
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RLock mylock = redissonClient.getLock(key);
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//释放锁（解锁）
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mylock.unlock();
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System.err.println("======unlock======" + Thread.currentThread().getName());
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}
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}
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