關於SpringBoot使用Redis空指標的問題(不能成功注入的問題)
阿新 • • 發佈:2020-11-22
自己的一個小專案使用redis在一個類裡可以注入成功,而在另一個類以卻不能注入成功
不多bb直接上程式碼
package com.common.utils; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.data.redis.core.BoundListOperations; import org.springframework.data.redis.core.RedisTemplate; import org.springframework.stereotype.Component; import org.springframework.util.CollectionUtils; import java.util.List; import java.util.Map; import java.util.Set; import java.util.concurrent.TimeUnit; @Component public class RedisUtil { @Autowired private RedisTemplate<String,Object> redisTemplate; public RedisUtil(RedisTemplate<String,Object> redisTemplate) { this.redisTemplate = redisTemplate; } /** * 指定快取失效時間 * @param key 鍵 * @param time 時間(秒) * @return */ public boolean expire(String key,long time){ try { if(time>0){ redisTemplate.expire(key,time,TimeUnit.SECONDS); } return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * 根據key 獲取過期時間 * @param key 鍵 不能為null * @return 時間(秒) 返回0代表為永久有效 */ public long getExpire(String key){ return redisTemplate.getExpire(key,TimeUnit.SECONDS); } /** * 判斷key是否存在 * @param key 鍵 * @return true 存在 false不存在 */ public boolean hasKey(String key){ try { return redisTemplate.hasKey(key); } catch (Exception e) { e.printStackTrace(); return false; } } /** * 刪除快取 * @param key 可以傳一個值 或多個 */ @SuppressWarnings("unchecked") public void del(String ... key){ if(key!=null&&key.length>0){ if(key.length==1){ redisTemplate.delete(key[0]); }else{ redisTemplate.delete(CollectionUtils.arrayToList(key)); } } } //============================String============================= /** * 普通快取獲取 * @param key 鍵 * @return 值 */ public Object get(String key){ return key==null?null:redisTemplate.opsForValue().get(key); } /** * 普通快取放入 * @param key 鍵 * @param value 值 * @return true成功 false失敗 */ public boolean set(String key,Object value) { try { redisTemplate.opsForValue().set(key,value); return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * 普通快取放入並設定時間 * @param key 鍵 * @param value 值 * @param time 時間(分鐘) time要大於0 如果time小於等於0 將設定無限期 * @return true成功 false 失敗 */ public boolean set(String key,Object value,long time){ try { if(time>0){ redisTemplate.opsForValue().set(key,value,TimeUnit.MINUTES); }else{ set(key,value); } return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * 遞增 * @param key 鍵 * @param delta 要增加幾(大於0) * @return */ public long incr(String key,long delta){ if(delta<0){ throw new RuntimeException("遞增因子必須大於0"); } return redisTemplate.opsForValue().increment(key,delta); } /** * 遞減 * @param key 鍵 * @param delta 要減少幾(小於0) * @return */ public long decr(String key,long delta){ if(delta<0){ throw new RuntimeException("遞減因子必須大於0"); } return redisTemplate.opsForValue().increment(key,-delta); } //================================Map================================= /** * HashGet * @param key 鍵 不能為null * @param item 項 不能為null * @return 值 */ public Object hget(String key,String item){ return redisTemplate.opsForHash().get(key,item); } /** * 獲取hashKey對應的所有鍵值 * @param key 鍵 * @return 對應的多個鍵值 */ public Map<Object,Object> hmget(String key){ return redisTemplate.opsForHash().entries(key); } /** * HashSet * @param key 鍵 * @param map 對應多個鍵值 * @return true 成功 false 失敗 */ public boolean hmset(String key,Map<String,Object> map){ try { redisTemplate.opsForHash().putAll(key,map); return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * HashSet 並設定時間 * @param key 鍵 * @param map 對應多個鍵值 * @param time 時間(秒) * @return true成功 false失敗 */ public boolean hmset(String key,Object> map,long time){ try { redisTemplate.opsForHash().putAll(key,map); if(time>0){ expire(key,time); } return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * 向一張hash表中放入資料,如果不存在將建立 * @param key 鍵 * @param item 項 * @param value 值 * @return true 成功 false失敗 */ public boolean hset(String key,String item,Object value) { try { redisTemplate.opsForHash().put(key,item,value); return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * 向一張hash表中放入資料,如果不存在將建立 * @param key 鍵 * @param item 項 * @param value 值 * @param time 時間(秒) 注意:如果已存在的hash表有時間,這裡將會替換原有的時間 * @return true 成功 false失敗 */ public boolean hset(String key,long time) { try { redisTemplate.opsForHash().put(key,value); if(time>0){ expire(key,time); } return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * 刪除hash表中的值 * @param key 鍵 不能為null * @param item 項 可以使多個 不能為null */ public void hdel(String key,Object... item){ redisTemplate.opsForHash().delete(key,item); } /** * 判斷hash表中是否有該項的值 * @param key 鍵 不能為null * @param item 項 不能為null * @return true 存在 false不存在 */ public boolean hHasKey(String key,String item){ return redisTemplate.opsForHash().hasKey(key,item); } /** * hash遞增 如果不存在,就會建立一個 並把新增後的值返回 * @param key 鍵 * @param item 項 * @param by 要增加幾(大於0) * @return */ public double hincr(String key,double by){ return redisTemplate.opsForHash().increment(key,by); } /** * hash遞減 * @param key 鍵 * @param item 項 * @param by 要減少記(小於0) * @return */ public double hdecr(String key,-by); } //============================set============================= /** * 根據key獲取Set中的所有值 * @param key 鍵 * @return */ public Set<Object> sGet(String key){ try { return redisTemplate.opsForSet().members(key); } catch (Exception e) { e.printStackTrace(); return null; } } /** * 根據value從一個set中查詢,是否存在 * @param key 鍵 * @param value 值 * @return true 存在 false不存在 */ public boolean sHasKey(String key,Object value){ try { return redisTemplate.opsForSet().isMember(key,value); } catch (Exception e) { e.printStackTrace(); return false; } } /** * 將資料放入set快取 * @param key 鍵 * @param values 值 可以是多個 * @return 成功個數 */ public long sSet(String key,Object...values) { try { return redisTemplate.opsForSet().add(key,values); } catch (Exception e) { e.printStackTrace(); return 0; } } /** * 將set資料放入快取 * @param key 鍵 * @param time 時間(秒) * @param values 值 可以是多個 * @return 成功個數 */ public long sSetAndTime(String key,long time,Object...values) { try { Long count = redisTemplate.opsForSet().add(key,values); if(time>0) { expire(key,time); } return count; } catch (Exception e) { e.printStackTrace(); return 0; } } /** * 獲取set快取的長度 * @param key 鍵 * @return */ public long sGetSetSize(String key){ try { return redisTemplate.opsForSet().size(key); } catch (Exception e) { e.printStackTrace(); return 0; } } /** * 移除值為value的 * @param key 鍵 * @param values 值 可以是多個 * @return 移除的個數 */ public long setRemove(String key,Object ...values) { try { Long count = redisTemplate.opsForSet().remove(key,values); return count; } catch (Exception e) { e.printStackTrace(); return 0; } } //===============================list================================= /** * 獲取list快取的內容 * @param key 鍵 * @param start 開始 * @param end 結束 0 到 -1代表所有值 * @return */ public List<Object> lGet(String key,long start,long end){ try { return redisTemplate.opsForList().range(key,start,end); } catch (Exception e) { e.printStackTrace(); return null; } } /** * 獲取list快取的長度 * @param key 鍵 * @return */ public long lGetListSize(String key){ try { return redisTemplate.opsForList().size(key); } catch (Exception e) { e.printStackTrace(); return 0; } } /** * 通過索引 獲取list中的值 * @param key 鍵 * @param index 索引 index>=0時, 0 表頭,1 第二個元素,依次類推;index<0時,-1,表尾,-2倒數第二個元素,依次類推 * @return */ public Object lGetIndex(String key,long index){ try { return redisTemplate.opsForList().index(key,index); } catch (Exception e) { e.printStackTrace(); return null; } } /** * 將list放入快取 * @param key 鍵 * @param value 值 * @return */ public boolean lSet(String key,Object value) { try { redisTemplate.opsForList().rightPush(key,value); return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * 將list放入快取 * @param key 鍵 * @param value 值 * @param time 時間(秒) * @return */ public boolean lSet(String key,long time) { try { redisTemplate.opsForList().rightPush(key,value); if (time > 0) { expire(key,time); } return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * 將list放入快取 * @param key 鍵 * @param value 值 * @return */ public boolean lSet(String key,List<Object> value) { try { redisTemplate.opsForList().rightPushAll(key,List<Object> value,long time) { try { redisTemplate.opsForList().rightPushAll(key,time); } return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * 根據索引修改list中的某條資料 * @param key 鍵 * @param index 索引 * @param value 值 * @return */ public boolean lUpdateIndex(String key,long index,Object value) { try { redisTemplate.opsForList().set(key,index,value); return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * 移除N個值為value * @param key 鍵 * @param count 移除多少個 * @param value 值 * @return 移除的個數 */ public long lRemove(String key,long count,Object value) { try { Long remove = redisTemplate.opsForList().remove(key,count,value); return remove; } catch (Exception e) { e.printStackTrace(); return 0; } } /** * 模糊查詢獲取key值 * @param pattern * @return */ public Set keys(String pattern){ return redisTemplate.keys(pattern); } /** * 使用Redis的訊息佇列 * @param channel * @param message 訊息內容 */ public void convertAndSend(String channel,Object message){ redisTemplate.convertAndSend(channel,message); } /** * 根據起始結束序號遍歷Redis中的list * @param listKey * @param start 起始序號 * @param end 結束序號 * @return */ public List<Object> rangeList(String listKey,long end) { //繫結操作 BoundListOperations<String,Object> boundValueOperations = redisTemplate.boundListOps(listKey); //查詢資料 return boundValueOperations.range(start,end); } /** * 彈出右邊的值 --- 並且移除這個值 * @param listKey */ public Object rifhtPop(String listKey){ //繫結操作 BoundListOperations<String,Object> boundValueOperations = redisTemplate.boundListOps(listKey); return boundValueOperations.rightPop(); } }
上面是Redis的配置檔案和自定義方法類,下面是呼叫Redis自定義方法類
package com.common.config; import org.springframework.cache.annotation.CachingConfigurerSupport; import org.springframework.cache.annotation.EnableCaching; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.data.redis.connection.RedisConnectionFactory; import org.springframework.data.redis.core.RedisTemplate; import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer; import org.springframework.data.redis.serializer.StringRedisSerializer; @Configuration @EnableCaching public class RedisConfig extends CachingConfigurerSupport{ /** * 配置自定義redisTemplate * @return */ @Bean RedisTemplate<String,Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) { RedisTemplate<String,Object> redisTemplate = new RedisTemplate<>(); redisTemplate.setConnectionFactory(redisConnectionFactory); Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class); // 設定值(value)的序列化採用Jackson2JsonRedisSerializer。 redisTemplate.setValueSerializer(jackson2JsonRedisSerializer); // 設定鍵(key)的序列化採用StringRedisSerializer。 redisTemplate.setKeySerializer(new StringRedisSerializer()); redisTemplate.setHashKeySerializer(new StringRedisSerializer()); redisTemplate.afterPropertiesSet(); return redisTemplate; } }
上面這個是傳送郵件的類,把郵箱存在Redis裡方便效驗(不用查資料庫了),效能更好一點
在這裡使用@Autowired和@Configuration可以成功注入Redis和呼叫其set方法
且redisUtil是有資料的是有資料的
但是我又新寫了個業務類名為AddLoginTooken,新增使用者登入tooken效驗用的
package com.common.utils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.annotation.Configuration; import org.springframework.data.redis.core.RedisTemplate; import org.springframework.mail.MailSendException; import org.springframework.mail.SimpleMailMessage; import org.springframework.mail.javamail.JavaMailSender; import java.util.Random; @Configuration public class SetMail { @Autowired RedisTemplate redisTemplate; @Autowired RedisUtil redisUtil; @Autowired private JavaMailSender javaMailSender; Logger logger = LoggerFactory.getLogger(this.getClass()); public String sendMail(String mail){ String checkCode = String.valueOf(new Random().nextInt(899999) + 100000); SimpleMailMessage message = new SimpleMailMessage(); try { redisUtil.set(mail,checkCode,1); message.setFrom("[email protected]"); message.setTo(mail); message.setSubject("歡迎成為寵物救助平臺的使用者"); message.setText("您的註冊驗證碼為:" + checkCode); javaMailSender.send(message); logger.info("郵件傳送成功"); } catch (MailSendException e) { logger.error("目標郵箱不存在"); } catch (Exception e) { e.printStackTrace(); logger.error("文字郵件傳送異常"); } return checkCode; } }
和那個setMail類一模一樣的程式碼,一模一樣的註釋,而且都有spring的小圖示,說明應該是都注入進去了呀
但是呼叫這個卻有空指標的問題:
package com.common.utils; import com.pojo.User; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.annotation.Configuration; import org.springframework.data.redis.core.RedisTemplate; import java.util.Date; import java.util.UUID; @Configuration public class AddLoginTooken { @Autowired RedisTemplate redisTemplate; @Autowired RedisUtil redisUtil; public User addLoginTicket(User user){ Date date = new Date(); date.setTime(date.getTime()+1000*3600*30); user.setUser_tooken(UUID.randomUUID().toString().replaceAll("-","")); String user_tooken = user.getUser_tooken(); redisUtil.set("user_tooken",user_tooken); return user; } }
debug發現redisUtil為空
我解決他的第一個想法是在Application里加一個掃描
java.lang.NullPointerException at com.common.utils.AddLoginTooken.addLoginTicket(AddLoginTooken.java:26) at com.service.impl.LoginServiceImpl.login(LoginServiceImpl.java:39) at com.controller.LoginController.login(LoginController.java:33) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) at javax.servlet.http.HttpServlet.service(HttpServlet.java:660) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:748)
但是還是不行,重啟IDEA和清快取都不行
求解
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