关于SpringBoot使用Redis空指针的问题(不能成功注入的问题)

网友投稿 1436 2023-03-09

关于SpringBoot使用Redis空指针的问题(不能成功注入的问题)

关于SpringBoot使用Redis空指针的问题(不能成功注入的问题)

自己的一个小项目使用redis在一个类里可以注入成功,而在另一个类以却不能注入成功

不多bb直接上代码

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 redisTemplate;

public RedisUtil(RedisTemplate redisTemplate) {

this.redisTemplate = redisTemplate;

}

/**

* 指定缓存失效时间

* @param key 键

* @param time 时间(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;

}

}

/**

* 根据key 获取过期时间

* @param key 键 不能为null

* @return 时间(秒) 返回0代表为永久有效

*/

public long getExpire(String key){

return redisTemplate.getExpire(key,TimeUnit.SECONDS);

}

/**

* 判断key是否存在

* @param key 键

* @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;

}

}

/**

* 删除缓存

* @param key 可以传一个值 或多个

*/

@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=============================

/**

* 普通缓存获取

* @param key 键

* @return 值

*/

public Object get(String key){

return key==null?null:redisTemplate.opsForValue().get(key);

}

/**

* 普通缓存放入

* @param key 键

* @param value 值

* @return true成功 false失败

*/

public boolean set(String key,Object value) {

try {

redisTemplate.opsForValue().set(key, value);

return true;

} catch (Exception e) {

e.printStackTrace();

return false;

}

}

/**

* 普通缓存放入并设置时间

* @param key 键

* @param value 值

* @param time 时间(分钟) time要大于0 如果time小于等于0 将设置无限期

* @return true成功 false 失败

*/

public boolean set(String key,Object value,long time){

try {

if(time>0){

redisTemplate.opsForValue().set(key, value, time, TimeUnit.MINUTES);

}else{

set(key, value);

}

return true;

} catch (Exception e) {

e.printStackTrace();

return false;

}

}

/**

* 递增

* @param key 键

* @param delta 要增加几(大于0)

* @return

*/

public long incr(String key, long delta){

if(delta<0){

throw new RuntimeException("递增因子必须大于0");

}

return redisTemplate.opsForValue().increment(key, delta);

}

/**

* 递减

* @param key 键

* @param delta 要减少几(小于0)

* @return

*/

public long decr(String key, long delta){

if(delta<0){

throw new RuntimeException("递减因子必须大于0");

}

return redisTemplate.opsForValue().increment(key, -delta);

}

//================================Map=================================

/**

* HashGet

* @param key 键 不能为null

* @param item 项 不能为null

* @return 值

*/

public Object hget(String key,String item){

return redisTemplate.opsForHash().get(key, item);

}

/**

* 获取hashKey对应的所有键值

* @param key 键

* @return 对应的多个键值

*/

public Map hmget(String key){

return redisTemplate.opsForHash().entries(key);

}

/**

* HashSet

* @param key 键

* @param map 对应多个键值

* @return true 成功 false 失败

*/

public boolean hmset(String key, Map map){

try {

redisTemplate.opsForHash().putAll(key, map);

return true;

} catch (Exception e) {

e.printStackTrace();

return false;

}

}

/**

* HashSet 并设置时间

* @param key 键

* @param map 对应多个键值

* @param time 时间(秒)

* @return true成功 false失败

*/

public boolean hmset(String key, Map map, long time){

try {

redisTemplate.opsForHash().putAll(key, map);

if(time>0){

expire(key, time);

}

return true;

} catch (Exception e) {

e.printStackTrace();

return false;

}

}

/**

* 向一张hash表中放入数据,如果不存在将创建

* @param key 键

* @param item 项

* @param value 值

* @return true 成功 false失败

*/

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;

}

}

/**

* 向一张hash表中放入数据,如果不存在将创建

* @param key 键

* @param item 项

* @param value 值

* @param time 时间(秒) 注意:如果已存在的hash表有时间,这里将会替换原有的时间

* @return true 成功 false失败

*/

public boolean hset(String key,String item,Object value,long time) {

try {

redisTemplate.opsForHash().put(key, item, value);

if(time>0){

expire(key, time);

}

return true;

} catch (Exception e) {

e.printStackTrace();

return false;

}

}

/**

* 删除hash表中的值

* @param key 键 不能为null

* @param item 项 可以使多个 不能为null

*/

public void hdel(String key, Object... item){

redisTemplate.opsForHash().delete(key,item);

}

/**

* 判断hash表中是否有该项的值

* @param key 键 不能为null

* @param item 项 不能为null

* @return true 存在 false不存在

*/

public boolean hHasKey(String key, String item){

return redisTemplate.opsForHash().hasKey(key, item);

}

/**

* hash递增 如果不存在,就会创建一个 并把新增后的值返回

* @param key 键

* @param item 项

* @param by 要增加几(大于0)

* @return

*/

public double hincr(String key, String item,double by){

return redisTemplate.opsForHash().increment(key, item, by);

}

/**

* hash递减

* @param key 键

* @param item 项

* @param by 要减少记(小于0)

* @return

*/

public double hdecr(String key, String item,double by){

return redisTemplate.opsForHash().increment(key, item,-by);

}

//============================set=============================

/**

* 根据key获取Set中的所有值

* @param key 键

* @return

*/

public Set sGet(String key){

try {

return redisTemplate.opsForSet().members(key);

} catch (Exception e) {

e.printStackTrace();

return null;

}

}

/**

* 根据value从一个set中查询,是否存在

* @param key 键

* @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;

}

}

/**

* 将数据放入set缓存

* @param key 键

* @param values 值 可以是多个

* @return 成功个数

*/

public long sSet(String key, Object...values) {

try {

return redisTemplate.opsForSet().add(key, values);

} catch (Exception e) {

e.printStackTrace();

return 0;

}

}

/**

* 将set数据放入缓存

* @param key 键

* @param time 时间(秒)

* @param values 值 可以是多个

* @return 成功个数

*/

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;

}

}

/**

* 获取set缓存的长度

* @param key 键

* @return

*/

public long sGetSetSize(String key){

try {

return redisTemplate.opsForSet().size(key);

} catch (Exception e) {

e.printStackTrace();

return 0;

http://}

}

/**

* 移除值为value的

* @param key 键

* @param values 值 可以是多个

* @return 移除的个数

*/

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=================================

/**

* 获取list缓存的内容

* @param key 键

* @param start 开始

* @param end 结束 0 到 -1代表所有值

* @return

*/

public List lGet(String key, long start, long end){

try {

return redisTemplate.opsForList().range(key, start, end);

} catch (Exception e) {

e.printStackTrace();

return null;

}

}

/**

* 获取list缓存的长度

* @param key 键

* @return

*/

public long lGetListSize(String key){

try {

return redisTemplate.opsForList().size(key);

} catch (Exception e) {

e.printStackTrace();

return 0;

}

}

/**

* 通过索引 获取list中的值

* @param key 键

* @param index 索引 index>=0时, 0 表头,1 第二个元素,依次类推;index<0时,-1,表尾,-2倒数第二个元素,依次类推

* @return

*/

public Object lGetIndex(String key,long index){

try {

return redisTemplate.opsForList().index(key, index);

} catch (Exception e) {

e.printStackTrace();

return null;

}

}

/**

* 将list放入缓存

* @param key 键

* @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;

}

}

/**

* 将list放入缓存

* @param key 键

* @param value 值

* @param time 时间(秒)

* @return

*/

public boolean lSet(String key, Object value, long time) {

try {

redisTemplate.opsForList().rightPush(key, value);

if (time > 0) {

expire(key, time);

}

return true;

} catch (Exception e) {

e.printStackTrace();

return false;

}

}

/**

* 将list放入缓存

* @param key 键

* @param value 值

* @return

*/

public boolean lSet(String key, List value) {

try {

redisTemplate.opsForList().rightPushAll(key, value);

return true;

} catch (Exception e) {

e.printStackTrace();

return false;

}

}

/**

* 将list放入缓存

* @param key 键

* @param value 值

* @param time 时间(秒)

* @return

*/

public boolean lSet(String key, List value, long time) {

try {

redisTemplate.opsForList().rightPushAll(key, value);

if (time > 0) {

expire(key, time);

}

return true;

} catch (Exception e) {

e.printStackTrace();

return false;

}

}

/**

* 根据索引修改list中的某条数据

* @param key 键

* @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个值为value

* @param key 键

* @param count 移除多少个

* @param value 值

* @return 移除的个数

*/

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;

}

}

/**

* 模糊查询获取key值

* @param pattern

* @return

*/

public Set keys(String pattern){

return redisTemplate.keys(pattern);

}

/**

* 使用Redis的消息队列

* @param channel

* @param message 消息内容

*/

public void convertAndSend(String channel, Object message){

redisTemplate.convertAndSend(channel,message);

}

/**

* 根据起始结束序号遍历Redis中的list

* @param listKey

* @param start 起始序号

* @param end 结束序号

* @return

*/

public List rangeList(String listKey, long start, long end) {

//绑定操作

BoundListOperations boundValueOperations = redisTemplate.boundListOps(listKey);

//查询数据

return boundValueOperations.range(start, end);

}

/**

* 弹出右边的值 --- 并且移除这个值

* @param listKey

*/

public Object rifhtPop(String listKey){

//绑定操作

BoundListOperations boundValueOperations = redisTemplate.boundListOps(listKey);

return boundValueOperations.rightPop();

}

}

上面是Redis的配置文件和自定义方法类,下面是调用Redis自定义方法类

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{

/**

* 配置自定义redisTemplate

* @return

*/

@Bean

RedisTemplate redisTemplate(RedisConnectionFactory redisConnectionFactory) {

RedisTemplate redisTemplate = new RedisTemplate<>();

redisTemplate.setConnectionFactory(redisConnectionFactory);

Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);

// 设置值(value)的序列化采用Jackson2JsonRedisSerializer。

redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);

// 设置键(key)的序列化采用StringRedisSerializer。

redisTemplate.setKeySerializer(new StringRedisSerializer());

redisTemplate.setHashKeySerializer(new StringRedisSerializer());

redisTemplate.afterPropertiesSet();

return redisTemplate;

}

}

且redisUtil是有数据的是有数据的

但是我又新写了个业务类名为AddLoginTooken,添加用户登录tooken效验用的

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("742919609@qq.com");

message.setTo(mail);

message.setSubject("欢迎成为宠物救助平台的用户");

message.setText("您的注册验证码为:" + checkCode);

javaMailSender.send(message);

logger.info("邮件发送成功");

} catch (MailSendException e) {

logger.error("目标邮箱不存在");

} catch (Exception e) {

e.printStackTrace();

logger.error("文本邮件发送异常");

}

return checkCode;

}

}

和那个setMail类一模一样的代码,一模一样的注释,而且都有spring的小图标,说明应该是都注入进去了呀

但是调用这个却有空指针的问题:

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发现redisUtil为空

我解决他的第一个想法是在Application里加一个扫描

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-.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590)

at org.apache.tomcat.util-.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)

但是还是不行,重启IDEA和清缓存都不行

求解

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