前言
本文是博主从事后端开发以来,对公司、个人项目的经验总结,包含代码编写、功能推荐、第三方库使用及优雅配置等,希望大家看到都能有所收获
一. 优雅的进行线程池异常处理
在Java开发中,线程池的使用必不可少,使用无返回值 execute() 方法时,线程执行发生异常的话,需要记录日志,方便回溯,一般做法是在线程执行方法内 try/catch 处理,如下:- @Test
- public void test() throws Exception {
- ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(5, 10, 60,
- TimeUnit.SECONDS, new ArrayBlockingQueue<>(100000));
- Future<Integer> submit = threadPoolExecutor.execute(() -> {
- try {
- int i = 1 / 0;
- return i;
- } catch (Exception e) {
- log.error(e.getMessage(), e);
- return null;
- }
- });
- }
复制代码 但是当线程池调用方法很多时,那么每个线程执行方法内都要 try/catch 处理,这就不优雅了,其实ThreadPoolExecutor类还支持传入 ThreadFactory 参数,自定义线程工厂,在创建 thread 时,指定 setUncaughtExceptionHandler 异常处理方法,这样就可以做到全局处理异常了,代码如下:- ThreadFactory threadFactory = r -> {
- Thread thread = new Thread(r);
- thread.setUncaughtExceptionHandler((t, e) -> {
- // 记录线程异常
- log.error(e.getMessage(), e);
- });
- return thread;
- };
- ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(5, 10, 60,
- TimeUnit.SECONDS, new ArrayBlockingQueue<>(100000),
- threadFactory);
- threadPoolExecutor.execute(() -> {
- log.info("---------------------");
- int i = 1 / 0;
- });
复制代码 二. 线程池决绝策略设置错误导致业务接口执行超时
先介绍下线程池得四种决绝策略
- AbortPolicy:丢弃任务并抛出RejectedExecutionException异常,这是线程池默认的拒绝策略
- DiscardPolicy:丢弃任务,但是不抛出异常。如果线程队列已满,则后续提交的任务都会被丢弃,且是静默丢弃。
使用此策略,可能会使我们无法发现系统的异常状态。建议是一些无关紧要的业务采用此策略
- DiscardOldestPolicy:丢弃队列最前面的任务,然后重新提交被拒绝的任务。此拒绝策略,是一种喜新厌旧的拒绝策略。是否要采用此种拒绝策略,还得根据实际业务是否允许丢弃老任务来认真衡量。
- CallerRunsPolicy:由调用线程处理该任务
如下是一个线上业务接口使用得线程池配置,决绝策略采用 CallerRunsPolicy- // 某个线上线程池配置如下
- ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(
- 50, // 最小核心线程数
- 50, // 最大线程数,当队列满时,能创建的最大线程数
- 60L, TimeUnit.SECONDS, // 空闲线程超过核心线程时,回收该线程的最大等待时间
- new LinkedBlockingQueue<>(5000), // 阻塞队列大小,当核心线程使用满时,新的线程会放进队列
- new CustomizableThreadFactory("task"), // 自定义线程名
- new ThreadPoolExecutor.CallerRunsPolicy() // 线程执行的拒绝策略
- );
复制代码 在某些情况下,子线程任务调用第三方接口超时,导致核心线程数、最大线程数占满、阻塞队列占满的情况下执行拒绝策略时,由于使用 CallerRunsPolicy 策略,导致业务线程执行子任务时继续超时,进而导致接口执行异常,这种情况下,考虑到子线程任务得重要性,不是很重要得话,可以使用 DiscardPolicy 策略,要是很重要,可以发送到消息队列中持久化子线程任务数据待后续处理
三. 优雅的单例模式懒加载帮助类代码实现
博主推荐通过静态内部类实现单例模式,并实现懒加载效果,代码如下- // 使用静态内部类完成单例模式封装,避免线程安全问题,避免重复初始化成员属性
- @Slf4j
- public class FilterIpUtil {
-
- private FilterIpUtil() {
- }
-
- private List<String> strings = new ArrayList<>();
-
- // 代码块在FilterIpUtil实例初始化时才会执行
- {
-
- // 在代码块中完成文件的第一次读写操作,后续不再读这个文件
- System.out.println("FilterIpUtil init");
- try (InputStream resourceAsStream = FilterIpUtil.class.getClassLoader().getResourceAsStream("filterIp.txt")) {
- // 将文件内容放到string集合中
- IoUtil.readUtf8Lines(resourceAsStream, strings);
- } catch (IOException e) {
- log.error(e.getMessage(), e);
- }
- }
-
- public static FilterIpUtil getInstance() {
- return InnerClassInstance.instance;
- }
- // 使用内部类完成单例模式,由jvm保证线程安全
- private static class InnerClassInstance {
- private static final FilterIpUtil instance = new FilterIpUtil();
- }
-
- // 判断集合中是否包含目标参数
- public boolean isFilter(String arg) {
- return strings.contains(arg);
- }
-
- }
复制代码 四. 使用ip2region实现请求地址解析
在博主之前公司得项目中,ip解析是调用淘宝IP还有聚合IP接口获取结果,通常耗时200毫秒左右,并且接口不稳定时而会挂。都会影响业务接口耗时,后来在 github 上了解到 ip2region 这个项目,使用本地ip库查询,查询速度微秒级别, 精准度能达到90%,但是ip库还是有少部分ip信息不准,建议数据库中把请求ip地址保存下来。简介如下:
ip2region v2.0 - 是一个离线IP地址定位库和IP定位数据管理框架,10微秒级别的查询效率,提供了众多主流编程语言的 xdb 数据生成和查询客户端实现基于 xdb 文件的查询,下面是一个 Spring 项目中 ip2region 帮助类来实现ip地址解析- /**
- * ip2region工具类
- */
- @Slf4j
- @Component
- public class Ip2region {
- private Searcher searcher = null;
- @Value("${ip2region.path:}")
- private String ip2regionPath = "";
- @PostConstruct
- private void init() {
- // 1、从 dbPath 加载整个 xdb 到内存。
- String dbPath = ip2regionPath;
- // 1、从 dbPath 加载整个 xdb 到内存。
- byte[] cBuff;
- try {
- cBuff = Searcher.loadContentFromFile(dbPath);
- searcher = Searcher.newWithBuffer(cBuff);
- } catch (Exception e) {
- log.error("failed to create content cached searcher: {}", e.getMessage(), e);
- }
- }
- public IpInfoBean getIpInfo(String ip) {
- if (StringUtils.isBlank(ip)) {
- return null;
- }
- // 3、查询
- try {
- long sTime = System.nanoTime();
- // 国家|区域|省份|城市|ISP
- String region = searcher.search(ip);
- long cost = TimeUnit.NANOSECONDS.toMicros((long) (System.nanoTime() - sTime));
- log.info("{region: {}, ioCount: {}, took: {} μs}", region, searcher.getIOCount(), cost);
- if (StringUtils.isNotBlank(region)) {
- String[] split = region.split("\|");
- IpInfoBean ipInfo = new IpInfoBean();
- ipInfo.setIp(ip);
- if (!"".equals(split[0])) {
- ipInfo.setCountry(split[0]);
- }
- if (!"".equals(split[2])) {
- ipInfo.setProvince(split[2]);
- }
- if (!"".equals(split[3])) {
- ipInfo.setCity(split[3]);
- }
- if (!"".equals(split[4])) {
- ipInfo.setIsp(split[4]);
- }
- return ipInfo;
- }
- } catch (Exception e) {
- log.error("failed to search({}): {}", ip, e);
- return null;
- }
- // 4、关闭资源 - 该 searcher 对象可以安全用于并发,等整个服务关闭的时候再关闭 searcher
- // searcher.close();
- // 备注:并发使用,用整个 xdb 数据缓存创建的查询对象可以安全的用于并发,也就是你可以把这个 searcher 对象做成全局对象去跨线程访问。
- return null;
- }
- }
复制代码 要注意得就是 ip2region v2.0 版本使用的xdb文件不建议放在项目 resources 下一起打包,存在编码格式问题,建议通过指定路径加载得方式单独放在服务器目录下
五. 优雅得Springboot + mybatis配置多数据源方式
Springboot + mybatis 得项目中一般通过 @MapperScan 注解配置 dao 层包目录,来实现 dao 层增强,其实项目中配置一个@MapperScan 是指定一个数据源,配置两个@MapperScan就可以指定两个数据源,通过不同得 dao 层包目录区分,来实现不同数据源得访问隔离。
比如下面代码中,com.xxx.dao.master 目录下为主数据源 dao 文件,com.xxx.dao.slave 为从数据源 dao 文件,这个方式比网上得基于 aop 加注解得方式更加简洁好用,也没有单个方法中使用不同数据源切换得问题,因此推荐这种写法- /**
- * 主数据源
- */
- @Slf4j
- @Configuration
- @MapperScan(basePackages = {"com.xxx.dao.master"},
- sqlSessionFactoryRef = "MasterSqlSessionFactory")
- public class MasterDataSourceConfig {
- @Bean(name = "MasterDataSource")
- @Qualifier("MasterDataSource")
- @ConfigurationProperties(prefix = "spring.datasource.master")
- public DataSource clickHouseDataSource() {
- return DruidDataSourceBuilder.create().build();
- }
- @Bean(name = "MasterSqlSessionFactory")
- public SqlSessionFactory getSqlSessionFactory(@Qualifier("MasterDataSource") DataSource dataSource) throws Exception {
- MybatisSqlSessionFactoryBean sessionFactoryBean = new MybatisSqlSessionFactoryBean();
- sessionFactoryBean.setDataSource(dataSource);
- sessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()
- .getResources("classpath*:mapper/master/*.xml"));
- log.info("------------------------------------------MasterDataSource 配置成功");
- return sessionFactoryBean.getObject();
- }
- }
- /**
- * 从数据源
- */
- @Slf4j
- @Configuration
- @MapperScan(basePackages = {"com.xxx.dao.slave"},
- sqlSessionFactoryRef = "SlaveSqlSessionFactory")
- public class MasterDataSourceConfig {
- @Bean(name = "SlaveDataSource")
- @Qualifier("SlaveDataSource")
- @ConfigurationProperties(prefix = "spring.datasource.slave")
- public DataSource clickHouseDataSource() {
- return DruidDataSourceBuilder.create().build();
- }
- @Bean(name = "SlaveSqlSessionFactory")
- public SqlSessionFactory getSqlSessionFactory(@Qualifier("SlaveDataSource") DataSource dataSource) throws Exception {
- MybatisSqlSessionFactoryBean sessionFactoryBean = new MybatisSqlSessionFactoryBean();
- sessionFactoryBean.setDataSource(dataSource);
- sessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()
- .getResources("classpath*:mapper/slave/*.xml"));
- log.info("------------------------------------------SlaveDataSource 配置成功");
- return sessionFactoryBean.getObject();
- }
- }
复制代码 数据源yml配置- spring:
- datasource:
- type: com.alibaba.druid.pool.DruidDataSource
- driverClassName: com.mysql.cj.jdbc.Driver
- # 主库数据源
- master:
- url: jdbc:mysql://localhost:3306/db1?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8
- username: root
- password:
- slave:
- url: jdbc:mysql://localhost:3306/db2?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8
- username: root
- password:
复制代码 博主刚开始编码一、两年得时候一个项目中遇到了多数据源使用得问题,那时候题主便在网上搜索Spring 多数据源得帖子,大多数都是基于Spring提供得AbstractRoutingDataSource + AOP + 注解 来做动态切换,包括现在流行得 Mybatis plus 官方得多数据源解决方案也是这种做法,这种做法解决了博主当时得多数据源使用问题,后来加了一个需求,在一个定时任务中,查询两个数据源得数据,才发现动态切换在单个方法中不好用了,最后使用得原生jdbc数据源解决。多年后,博主在另一家公司得项目中又遇到了多数据源问题,但是这次博主在网上搜索得是Mybatis 多数据源,才发现了这个优雅得解决方案,进而推荐给大家
六. Spring Security项目中,使用MDC实现接口请求调用追踪,以及用户ID记录
MDC介绍
MDC(Mapped Diagnostic Context,映射调试上下文)是 log4j 、logback及log4j2 提供的一种方便在多线程条件下记录日志的功能。MDC 可以看成是一个与当前线程绑定的哈希表,可以往其中添加键值对。MDC 中包含的内容可以被同一线程中执行的代码所访问。当前线程的子线程会继承其父线程中的 MDC 的内容。当需要记录日志时,只需要从 MDC 中获取所需的信息即可。
虽然MDC能够方便得实现接口请求调用追踪功能,但是它在子线程中会丢失父线程中添加得键值对信息,解决方法是通过父线程中调用线程池前调用 MDC.getCopyOfContextMap() ,然后在子线程中第一个调用 MDC.setConextMap() 获取键值对信息,完整实现代码如下:- /**
- * 自定义Spring线程池,解决子线程丢失reqest_id问题
- */
- public class ThreadPoolExecutorMdcWrapper extends ThreadPoolTaskExecutor {
- @Override
- public void execute(Runnable task) {
- super.execute(ThreadMdcUtil.wrap(task, MDC.getCopyOfContextMap()));
- }
- @Override
- public <T> Future<T> submit(Callable<T> task) {
- return super.submit(ThreadMdcUtil.wrap(task, MDC.getCopyOfContextMap()));
- }
- @Override
- public Future<?> submit(Runnable task) {
- return super.submit(ThreadMdcUtil.wrap(task, MDC.getCopyOfContextMap()));
- }
- }
- /**
- * MDC帮助类,添加reqest_id
- */
- public class ThreadMdcUtil {
- public static final String REQUEST_ID = "request_id";
- /**
- * 设置请求唯一ID
- */
- public static void setTraceIdIfAbsent() {
- if (MDC.get(REQUEST_ID) == null) {
- MDC.put(REQUEST_ID, IdUtil.getUid());
- }
- }
- /**
- * 存在userId则添加到REQUEST_ID中
- * @param userId
- */
- public static void setUserId(String userId) {
- String s = MDC.get(REQUEST_ID);
- if (s != null) {
- MDC.put(REQUEST_ID, s + "_" + userId);
- }
- }
- public static void removeTraceId() {
- MDC.remove(REQUEST_ID);
- }
- public static <T> Callable<T> wrap(final Callable<T> callable, final Map<String, String> context) {
- return () -> {
- if (context == null) {
- MDC.clear();
- } else {
- MDC.setContextMap(context);
- }
- setTraceIdIfAbsent();
- try {
- return callable.call();
- } finally {
- MDC.clear();
- }
- };
- }
- public static Runnable wrap(final Runnable runnable, final Map<String, String> context) {
- return () -> {
- if (context == null) {
- MDC.clear();
- } else {
- MDC.setContextMap(context);
- }
- // 设置traceId
- setTraceIdIfAbsent();
- try {
- runnable.run();
- } finally {
- MDC.clear();
- }
- };
- }
- }
复制代码 在 Spring Security 中添加 token 过滤器- /**
- * token过滤器 验证token有效性
- *
- * @author ruoyi
- */
- @Slf4j
- @Component
- public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {
- @Autowired
- private TokenService tokenService;
- @Override
- protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
- throws ServletException, IOException {
- try {
- // 入口传入请求ID
- ThreadMdcUtil.setTraceIdIfAbsent();
- LoginUserDetail loginUser = tokenService.getLoginUser(request);
- if (Objects.nonNull(loginUser) && Objects.isNull(SecurityContextHolder.getContext().getAuthentication())) {
- // 记录userId
- ThreadMdcUtil.setUserId(String.valueOf(loginUser.getMember().getId()));
- tokenService.verifyToken(loginUser);
- UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(loginUser, null, loginUser.getAuthorities());
- authenticationToken.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
- SecurityContextHolder.getContext().setAuthentication(authenticationToken);
- }
- chain.doFilter(request, response);
- } finally {
- // 出口移除请求ID
- ThreadMdcUtil.removeTraceId();
- }
- }
- }
复制代码 最后在 logback.xml 中添加 %X{request_id}- [/code]日志打印效果如下:
- [code]2022-11-27 21:29:48.008 [86c76336100c414dbe9217aeb099ccd5_12] [http-nio-82-exec-2] [INFO ] c.w.m.a.s.impl.IHomeServiceImpl:56 getHomeIndexDataCompletableFuture - getHomeIndexDataCompletableFuture:com.wayn.common.util.R@701f7b8e[code=200,msg=操作成功,map={bannerList=[{"createTime":"2020-06-26 19:56:03","delFlag":false,"id":14,"imgUrl":"https://m.360buyimg.com/mobilecms/s700x280_jfs/t1/117335/39/13837/263099/5f291a83E8ba761d0/5c0460445cb28248.jpg!cr_1125x449_0_166!q70.jpg.dpg","jumpUrl":"http://82.157.141.70/mall/#/detail/1155015","sort":0,"status":0,"title":"hh2","updateTime":"2022-06-19 09:16:46"},{"createTime":"2020-06-26 19:56:03","delFlag":false,"id":15,"imgUrl":"https://m.360buyimg.com/mobilecms/s700x280_jfs/t1/202096/26/11652/265782/616acb67E4fcdc9ac/8d7cdfbb6c934e67.jpg!cr_1125x449_0_166!q70.jpg.dpg","jumpUrl":"#/detail/1155015","sort":0,"status":0,"title":"hh","updateTime":"2022-06-19 09:04:58"}], newGoodsList=[{"actualSales":0,"brandId":0,"brief":"酥脆奶香,甜酸回味","categoryId":1008015,"counterPrice":56.00,"createTime":"2018-02-01 00:00:00","delFlag":false,"goodsSn":"1116011","id":1116011,"isHot":true,"isNew":true,"isOnSale":true,"keywords":"","name":"蔓越莓曲奇 200克","picUrl":"http://yanxuan.nosdn.127.net/767b370d07f3973500db54900bcbd2a7.png","retailPrice":36.00,"shareUrl":"","sort":5,"unit":"件","updateTime":"2018-02-01 00:00:00","virtualSales":10},{"actualSales":0,"brandId":0,"brief":"粉彩色泽,记录生活","categoryId":1012003,"counterPrice":49.00,"createTime":"2018-02-01 00:00:00","delFlag":false,"goodsSn":"1127047","id":1127047,"isHot":false,"isNew":true,"isOnSale":true,"keywords":"","name":"趣味粉彩系列笔记本","picUrl":"http://yanxuan.nosdn.127.net/6c03ca93d8fe404faa266ea86f3f1e43.png","retailPrice":29.00,"shareUrl":"","sort":2,"unit":"件","updateTime":"2018-02-01 00:00:00","virtualSales":10},{"actualSales":0,"brandId":0,"brief":"慢回弹海绵,时尚设计。","categoryId":1008002,"counterPrice":66.00,"createTime":"2018-02-01 00:00:00","delFlag":false,"goodsSn":"1134030","id":1134030,"isHot":false,"isNew":true,"isOnSale":true,"keywords":"","name":"简约知性记忆棉坐垫","picUrl":"http://yanxuan.nosdn.127.net/aa49dfe878becf768eddc4c1636643a6.png","retailPrice":46.00,"shareUrl":"","sort":12,"unit":"件","updateTime":"2018-02-01 00:00:00","virtualSales":10},{"actualSales":0,"brandId":0,"brief":"慢回弹海绵的呵护,萌趣添彩。","categoryId":1008002,"counterPrice":69.00,"createTime":"2018-02-01 00:00:00","delFlag":false,"goodsSn":"1134032","id":1134032,"isHot":false,"isNew":true,"isOnSale":true,"keywords":"","name":"趣味粉彩系列记忆棉坐垫","picUrl":"http://yanxuan.nosdn.127.net/8b30eeb17c831eba08b97bdcb4c46a8e.png","retailPrice":49.00,"shareUrl":"","sort":13,"unit":"件","updateTime":"2018-02-01 00:00:00","virtualSales":10},{"actualSales":0,"brandId":0,"brief":"100%桑蚕丝,丝滑润肤","categoryId":1008009,"counterPrice":2619.00,"createTime":"2018-02-01 00:00:00","delFlag":false,"goodsSn":"1135002","id":1135002,"isHot":false,"isNew":true,"isOnSale":true,"keywords":"","name":"宫廷奢华真丝四件套","picUrl":"http://yanxuan.nosdn.127.net/45548f26cfd0c7c41e0afc3709d48286.png","retailPrice":2599.00,"shareUrl":"","sort":1,"unit":"件","updateTime":"2018-02-01 00:00:00","virtualSales":10},{"actualSales":0,"brandId":0,"brief":"自由海军领探索未来梦","categoryId":1020003,"counterPrice":89.00,"createTime":"2018-02-01 00:00:00","delFlag":false,"goodsSn":"1135072","id":1135072,"isHot":false,"isNew":true,"isOnSale":true,"keywords":"","name":"经典海魂纹水手裙(婴童)","picUrl":"http://yanxuan.nosdn.127.net/43e57d4208cdc78ac9c088f9b3e798f5.png","retailPrice":69.00,"shareUrl":"","sort":3,"unit":"件","updateTime":"2018-02-01 00:00:00","virtualSales":10},{"actualSales":0,"brandId":0,"brief":"经典海魂纹自由海军领","categoryId":1020003,"counterPrice":89.00,"createTime":"2018-02-01 00:00:00","delFlag":false,"goodsSn":"1135073","id":1135073,"isHot":false,"isNew":true,"isOnSale":true,"keywords":"","name":"海魂纹哈衣水手服(婴童)","picUrl":"http://yanxuan.nosdn.127.net/53052b04ae001d289c040e09ea92231c.png","retailPrice":69.00,"shareUrl":"","sort":4,"unit":"件","updateTime":"2018-02-01 00:00:00","virtualSales":10},{"actualSales":5,"brandId":0,"brief":"差旅好伴侣","categoryId":1032000,"counterPrice":119.00,"createTime":"2018-02-01 00:00:00","delFlag":false,"goodsSn":"1152031","id":1152031,"isHot":true,"isNew":true,"isOnSale":true,"keywords":"","name":"魔兽世界-伊利丹颈枕眼罩套装","picUrl":"http://yanxuan.nosdn.127.net/fd6e78a397bd9e9804116a36f0270b0a.png","retailPrice":99.00,"shareUrl":"","sort":4,"unit":"件","updateTime":"2018-02-01 00:00:00","virtualSales":10},{"actualSales":5,"brandId":0,"brief":"桌面整理神器","categoryId":1032000,"counterPrice":519.00,"createTime":"2018-02-01 00:00:00","delFlag":false,"goodsSn":"1152095","id":1152095,"isHot":false,"isNew":true,"isOnSale":true,"keywords":"","name":"魔兽世界 联盟·暴风城 堡垒收纳盒","picUrl":"http://yanxuan.nosdn.127.net/c86b49f635fa141decebabbd0966a6ef.png","retailPrice":499.00,"shareUrl":"","sort":6,"unit":"件","updateTime":"2018-02-01 00:00:00","virtualSales":10},{"actualSales":0,"brandId":0,"brief":"3重透气,清爽柔滑","categoryId":1008009,"counterPrice":479.00,"createTime":"2018-02-01 00:00:00","delFlag":false,"goodsSn":"1152161","id":1152161,"isHot":false,"isNew":true,"isOnSale":true,"keywords":"","name":"竹语丝麻印花四件套","picUrl":"http://yanxuan.nosdn.127.net/977401e75113f7c8334c4fb5b4bf6215.png","retailPrice":459.00,"shareUrl":"","sort":6,"unit":"件","updateTime":"2018-02-01 00:00:00","virtualSales":10}], categoryList=[{"createTime":"2020-12-08 23:09:12","delFlag":false,"iconUrl":"http://cdn.wayn.xin/9fc3c52571aa38a1466f114c2dc892fc.png","id":2,"jumpType":0,"name":"大牌手机","picUrl":"http://cdn.wayn.xin/2545dd00ca4575759024af2811949a9d.jpg","sort":1,"status":0,"updateTime":"2020-12-12 19:26:48","valueId":5,"valueUrl":"http://baidu.com"},{"createTime":"2020-12-06 13:27:54","delFlag":false,"iconUrl":"http://82.157.141.70/upload/2022/02/21/a23fa32c8f4004a8c9fbbb1784462163.jpg","id":1,"jumpType":0,"name":"滋补保健2","picUrl":"http://cdn.wayn.xin/d4de7172eb7ae4178ae4dafd6a973d8f.jpg","sort":2,"status":0,"updateTime":"2022-06-19 09:17:20","valueId":2},{"createTime":"2020-12-08 23:26:15","delFlag":false,"iconUrl":"http://cdn.wayn.xin/6bc0f8a131d2d16b8fc2004d4aa4860c.png","id":3,"jumpType":1,"name":"不锈钢锅","picUrl":"http://cdn.wayn.xin/314d87257f7a2ff03d5f4c5183797912.jpg","sort":2,"status":0,"updateTime":"2020-12-12 19:27:24","valueId":1036000},{"createTime":"2020-12-12 19:28:08","delFlag":false,"iconUrl":"http://cdn.wayn.xin/5a90531d901529967885279d7dc826e1.png","id":14,"jumpType":0,"name":"进口牛奶","picUrl":"http://cdn.wayn.xin/0b1f6ab63d5e222c52c83a2d0581e44c.jpg","sort":3,"status":0,"valueId":5},{"createTime":"2020-12-12 19:28:33","delFlag":false,"iconUrl":"http://cdn.wayn.xin/33530951827ca7e59940d51cda537d84.png","id":15,"jumpType":0,"name":"量贩囤货","picUrl":"http://cdn.wayn.xin/bb6daee3b3e51c3008db97585249f513.jpg","sort":4,"status":0,"valueId":2},{"createTime":"2020-12-12 19:28:50","delFlag":false,"iconUrl":"http://cdn.wayn.xin/7d337f25111b263b29d5d12589015c46.png","id":16,"jumpType":0,"name":"清洁用品","picUrl":"http://cdn.wayn.xin/be8995bda39d03b17349b8ec0dcab3d5.jpg","sort":5,"status":0,"valueId":2},{"createTime":"2020-12-12 19:29:10","delFlag":false,"iconUrl":"http://cdn.wayn.xin/2e632ec0173bb477dcdb601495e0412a.png","id":17,"jumpType":0,"name":"洗护用品","picUrl":"http://cdn.wayn.xin/53fb88c9d1245caa882aa3fc29187d0b.jpg","sort":6,"status":0,"valueId":4},{"createTime":"2020-12-12 19:29:28","delFlag":false,"iconUrl":"http://cdn.wayn.xin/942323c0e74677cf2aa15f09a1e63bca.png","id":18,"jumpType":0,"name":"日用百货","picUrl":"http://cdn.wayn.xin/8587f91db2edcb43e57da9835cc7ec76.jpg","sort":7,"status":0,"valueId":2},{"createTime":"2020-12-12 19:29:46","delFlag":false,"iconUrl":"http://cdn.wayn.xin/18d9d860ba9b8b28522e050f11a8a8e0.png","id":19,"jumpType":0,"name":"明星乳胶","picUrl":"http://cdn.wayn.xin/65273c7fb2273e90958e92626248a90a.jpg","sort":8,"status":0,"valueId":6},{"createTime":"2020-12-12 19:30:15","delFlag":false,"iconUrl":"http://cdn.wayn.xin/7c790577afda91eebc3c95586e190957.png","id":20,"jumpType":0,"name":"口碑好物","picUrl":"http://cdn.wayn.xin/210011b35be4ceee39e6a466b40b8e22.jpg","sort":9,"status":0,"updateTime":"2021-04-01 20:13:08","valueId":5}], expire_time=1669549170235, hotGoodsList=[{"actualSales":1,"brandId":1001045,"brief":"一级桑蚕丝,吸湿透气柔软","categoryId":1036000,"counterPrice":719.00,"createTime":"2018-02-01 00:00:00","delFlag":false,"goodsSn":"1006013","id":1006013,"isHot":true,"isNew":false,"isOnSale":true,"keywords":"","name":"双宫茧桑蚕丝被 空调被","picUrl":"http://yanxuan.nosdn.127.net/583812520c68ca7995b6fac4c67ae2c7.png","retailPrice":699.00,"shareUrl":"","sort":7,"unit":"件","updateTime":"2021-08-08 11:19:36","virtualSales":10},{"actualSales":1,"brandId":1001045,"brief":"双层子母被,四季皆可使用","categoryId":1008008,"counterPrice":14199.00,"createTime":"2018-02-01 00:00:00","delFlag":false,"goodsSn":"1006014","id":1006014,"isHot":true,"isNew":false,"isOnSale":true,"keywords":"","name":"双宫茧桑蚕丝被 子母被","picUrl":"http://yanxuan.nosdn.127.net/2b537159f0f789034bf8c4b339c43750.png","retailPrice":1399.00,"shareUrl":"","sort":15,"unit":"件","updateTime":"2018-02-01 00:00:00","virtualSales":10},{"actualSales":6,"brandId":1001000,"brief":"加大加厚,双色精彩","categoryId":1036000,"counterPrice":219.00,"createTime":"2018-02-01 00:00:00","delFlag":false,"goodsSn":"1011004","id":1011004,"isHot":true,"isNew":false,"isOnSale":true,"keywords":"","name":"色织精梳AB纱格纹空调被","picUrl":"http://yanxuan.nosdn.127.net/0984c9388a2c3fd2335779da904be393.png","retailPrice":199.00,"shareUrl":"","sort":2,"unit":"件","updateTime":"2018-02-01 00:00:00","virtualSales":10},{"actualSales":6,"brandId":0,"brief":"共享亲密2人时光","categoryId":1008008,"counterPrice":219.00,"createTime":"2018-02-01 00:00:00","delFlag":false,"goodsSn":"1019002","id":1019002,"isHot":true,"isNew":false,"isOnSale":true,"keywords":"","name":"升级款护颈双人记忆枕","picUrl":"http://yanxuan.nosdn.127.net/0118039f7cda342651595d994ed09567.png","retailPrice":199.00,"shareUrl":"","sort":10,"unit":"件","updateTime":"2018-02-01 00:00:00","virtualSales":10},{"actualSales":6,"brandId":0,"brief":"健康保护枕","categoryId":1008008,"counterPrice":119.00,"createTime":"2018-02-01 00:00:00","delFlag":false,"goodsSn":"1019006","id":1019006,"isHot":true,"isNew":false,"isOnSale":true,"keywords":"","name":"植物填充护颈夜交藤枕","picUrl":"http://yanxuan.nosdn.127.net/60c3707837c97a21715ecc3986a744ce.png","retailPrice":99.00,"shareUrl":"","sort":7,"unit":"件","updateTime":"2018-02-01 00:00:00","virtualSales":10},{"actualSales":6,"brandId":0,"brief":"厚实舒适","categoryId":1008001,"counterPrice":59.00,"createTime":"2018-02-01 00:00:00","delFlag":false,"goodsSn":"1021000","id":1021000,"isHot":true,"isNew":false,"isOnSale":true,"keywords":"被","name":"埃及进口长绒棉毛巾","picUrl":"http://yanxuan.nosdn.127.net/7191f2599c7fe44ed4cff7a76e853154.png","retailPrice":39.00,"shareUrl":"","sort":7,"unit":"条","updateTime":"2018-02-01 00:00:00","virtualSales":10},{"actualSales":6,"brandId":1001020,"brief":"浪漫毛线绣球,简约而不简单","categoryId":1008009,"counterPrice":319.00,"createTime":"2018-02-01 00:00:00","delFlag":false,"goodsSn":"1022000","id":1022000,"isHot":true,"isNew":false,"isOnSale":true,"keywords":"","name":"意式毛线绣球四件套","picUrl":"http://yanxuan.nosdn.127.net/5350e35e6f22165f38928f3c2c52ac57.png","retailPrice":299.00,"shareUrl":"","sort":18,"unit":"件","updateTime":"2018-02-01 00:00:00","virtualSales":10},{"actualSales":32,"brandId":1001000,"brief":"柔软纱布,婴童可用","categoryId":1036000,"counterPrice":269.00,"createTime":"2018-02-01 00:00:00","delFlag":false,"goodsSn":"1027004","id":1027004,"isHot":true,"isNew":false,"isOnSale":true,"keywords":"","name":"色织六层纱布夏凉被","picUrl":"http://yanxuan.nosdn.127.net/6252f53aaf36c072b6678f3d8c635132.png","retailPrice":249.00,"shareUrl":"","sort":3,"unit":"件","updateTime":"2018-02-01 00:00:00","virtualSales":10},{"actualSales":32,"brandId":0,"brief":"原生苦荞,健康护颈","categoryId":1008008,"counterPrice":119.00,"createTime":"2018-02-01 00:00:00","delFlag":false,"goodsSn":"1036002","id":1036002,"isHot":true,"isNew":false,"isOnSale":true,"keywords":"","name":"高山苦荞麦枕","picUrl":"http://yanxuan.nosdn.127.net/ffd7efe9d5225dff9f36d5110b027caa.png","retailPrice":99.00,"shareUrl":"","sort":5,"unit":"件","updateTime":"2018-02-01 00:00:00","virtualSales":10},{"actualSales":32,"brandId":0,"brief":"5cm记忆绵的亲密包裹","categoryId":1008008,"counterPrice":619.00,"createTime":"2018-02-01 00:00:00","delFlag":false,"goodsSn":"1037011","id":1037011,"isHot":true,"isNew":false,"isOnSale":true,"keywords":"","name":"安睡慢回弹记忆绵床垫","picUrl":"http://yanxuan.nosdn.127.net/a03ea6f4509439acdafcb7ceba1debe0.png","retailPrice":599.00,"shareUrl":"","sort":22,"unit":"件","updateTime":"2018-02-01 00:00:00","virtualSales":10}]}]
- 2022-11-27 21:29:48.336 [9d919fb6d33c4652ba28ff87ae210809_12] [http-nio-82-exec-3] [DEBUG] c.w.c.c.m.s.G.selectGoodsListPage_mpCount:137 debug - ==> Preparing: SELECT COUNT(*) AS total FROM shop_goods WHERE del_flag = 0 AND is_on_sale = 1
- 2022-11-27 21:29:48.387 [9d919fb6d33c4652ba28ff87ae210809_12] [http-nio-82-exec-3] [DEBUG] c.w.c.c.m.s.G.selectGoodsListPage_mpCount:137 debug - ==> Parameters:
- 2022-11-27 21:29:48.426 [9d919fb6d33c4652ba28ff87ae210809_12] [http-nio-82-exec-3] [DEBUG] c.w.c.c.m.s.G.selectGoodsListPage_mpCount:137 debug - <== Total: 1
- 2022-11-27 21:29:48.430 [9d919fb6d33c4652ba28ff87ae210809_12] [http-nio-82-exec-3] [DEBUG] c.w.c.c.m.s.G.selectGoodsListPage:137 debug - ==> Preparing: select id, goods_sn, name, pic_url, counter_price, retail_price, actual_sales, virtual_sales from shop_goods WHERE del_flag = 0 and is_on_sale = 1 order by create_time desc LIMIT ?
- 2022-11-27 21:29:48.452 [9d919fb6d33c4652ba28ff87ae210809_12] [http-nio-82-exec-3] [DEBUG] c.w.c.c.m.s.G.selectGoodsListPage:137 debug - ==> Parameters: 6(Long)
- 2022-11-27 21:29:48.476 [9d919fb6d33c4652ba28ff87ae210809_12] [http-nio-82-exec-3] [DEBUG] c.w.c.c.m.s.G.selectGoodsListPage:137 debug - <== Total: 6
复制代码 在以上代码中,打个比方想要实现性别字段得自定义格式转换,就需要在convertToExcelData方法中,添加如下代码- public class CustomStringStringConverter implements Converter<String> {
- @Override
- public Class<?> supportJavaTypeKey() {
- return String.class;
- }
- @Override
- public CellDataTypeEnum supportExcelTypeKey() {
- return CellDataTypeEnum.STRING;
- }
- /**
- * 这里读的时候会调用
- *
- * @param context
- * @return
- */
- @Override
- public String convertToJavaData(ReadConverterContext<?> context) {
- return "自定义:" + context.getReadCellData().getStringValue();
- }
- /**
- * 这里是写的时候会调用 不用管
- *
- * @return
- */
- @Override
- public WriteCellData<?> convertToExcelData(WriteConverterContext<String> context) {
- return new WriteCellData<>(context.getValue());
- }
- }
复制代码 可以看到,非常得不优雅,对于这种类型字段,博主习惯使用枚举类来定义字段所有类型,然后将枚举类转换为 map(value,desc) 结构,就可以优雅得实现这个自定义格式得需求- @Override
- public WriteCellData<?> convertToExcelData(WriteConverterContext<String> context) {
- String value = context.getValue();
- if ("man".equals(value)) {
- return new WriteCellData<>("男");
- } else {
- return new WriteCellData<>("女");
- }
- }
复制代码 最后再导出 ExcelProperty 中甜腻加 StatusConverter ,就优雅得实现了自定义格式得需求- /**
- * 一、先定义int字段抽象转换类,实现通用转换逻辑
- */
- public abstract class AbstractIntConverter implements Converter<Integer> {
- abstract List<ConverterDTO> getArr();
- public WriteCellData<?> convertToExcelData(Integer value, ExcelContentProperty contentProperty, GlobalConfiguration globalConfiguration) {
- List<ConverterDTO> values = getArr();
- Map<Integer, String> map = values.stream().collect(toMap(ConverterDTO::getType, ConverterDTO::getDesc));
- String result = map.getOrDefault(value, "");
- return new WriteCellData<>(result);
- }
- static class ConverterDTO {
- private Integer type;
- private String desc;
- public Integer getType() {
- return type;
- }
- public void setType(Integer type) {
- this.type = type;
- }
- public String getDesc() {
- return desc;
- }
- public void setDesc(String desc) {
- this.desc = desc;
- }
- public ConverterDTO(Integer type, String desc) {
- this.type = type;
- this.desc = desc;
- }
- }
- }
- /**
- * 二、定义通用状态字段转换类
- */
- public class StatusConverter extends AbstractIntConverter {
- @Override
- List<ConverterDTO> getArr() {
- StatusEnum[] values = StatusEnum.values();
- return Arrays.stream(values).map(sexEnum -> new ConverterDTO(sexEnum.getType(), sexEnum.getDesc())).toList();
- }
- /**
- * 状态枚举
- */
- enum StatusEnum {
- MAN(0, "启用"),
- WOMAN(1, "禁用");
- private Integer type;
- private String desc;
- StatusEnum(Integer type, String desc) {
- this.type = type;
- this.desc = desc;
- }
- public Integer getType() {
- return type;
- }
- public String getDesc() {
- return desc;
- }
- }
- }
复制代码 八. Springboot 默认redis客户端lettuce经常连接超时解决方案
不知道大家有没有遇到这种情况,线上项目使用 lettuce 客户端,当操作 redis 得接口一段时间没有调用后(比如30分钟),再次调用 redis 操作后,就会遇到连接超时得问题,导致接口异常。博主直接给出分析过程:
- 通过wireshark抓包工具,发现项目中 redis 连接创建后,一段时间未传输数据后,客户端发送 psh 包,未收到服务端 ack 包,触发tcp得超时重传机制,在重传次数重试完后,最终客户端主动关闭了连接。
到这里我们就知道这个问题,主要原因在于服务端没有回复客户端(比如tcp参数设置、防火墙主动关闭等,都是针对一段时间内没有数据传输得tcp连接会做关闭处理),造成了客户端得连接超时
面对这个问题有三种解决方案:
- redis操作异常后进行重试,这篇文章有介绍 生产环境Redis连接,长时间无响应被服务器断开问题
- 启用一个心跳定时任务,定时访问 redis,保持 redis 连接不被关闭,简而言之,就是写一个定时任务,定时调用 redis得 get 命令,进而保活 redis 连接
- 基于Springboot 提供得 LettuceClientConfigurationBuilderCustomizer 自定义客户端配置,博主这里主要针对第三种自定义客户端配置来讲解一种优雅得方式
Springboot 项目中关于 lettuce 客户端得自动配置是没有启用保活配置得,要启用得话代码如下:- public class User extends BaseEntity {
- ...
- /**
- * 用户状态 0 启用 1 禁用
- */
- @ExcelProperty(value = "用户状态", converter = StatusConverter.class)
- private Integer userStatus;
- ...
- }
复制代码 添加 lettuce 客户端的自定义配置,在 KeepAliveOptions 中启用 enable ,这样 lettuce 客户端就会在tcp协议规范上启用 keep alive 机制自动发送心跳包
九. redis客户端lettuce启用epoll
直接给 官网连接,配置很简单,添加一个 netty-all 得依赖,lettuce 会自动检测项目系统是否支持 epoll(linux 系统支持),并且是否有netty-transport-native-epoll依赖( netty-all 包含 netty-transport-native-epoll ),都满足得话就会自动启用 epoll 事件循环,进一步提升系统性能- /**
- * 自定义lettuce客户端配置
- *
- * @return LettuceClientConfigurationBuilderCustomizer
- */
- @Bean
- public LettuceClientConfigurationBuilderCustomizer lettuceClientConfigurationBuilderCustomizer() {
- return clientConfigurationBuilder -> {
- LettuceClientConfiguration clientConfiguration = clientConfigurationBuilder.build();
- ClientOptions clientOptions = clientConfiguration.getClientOptions().orElseGet(ClientOptions::create);
- ClientOptions build = clientOptions.mutate().build();
- SocketOptions.KeepAliveOptions.Builder builder = build.getSocketOptions().getKeepAlive().mutate();
- // 保活配置
- builder.enable(true);
- builder.idle(Duration.ofSeconds(30));
- SocketOptions.Builder socketOptionsBuilder = clientOptions.getSocketOptions().mutate();
- SocketOptions.KeepAliveOptions keepAliveOptions = builder.build();
- socketOptionsBuilder.keepAlive(keepAliveOptions);
- SocketOptions socketOptions = socketOptionsBuilder.build();
- ClientOptions clientOptions1 = ClientOptions.builder().socketOptions(socketOptions).build();
- clientConfigurationBuilder.clientOptions(clientOptions1);
- };
- }
复制代码 十. Springboot web项目优雅停机
web项目配置了优雅停机后,在重启jar包,或者容器时可以防止正在活动得线程被突然停止( kill -9 无解,请不要使用这个参数杀线上进程,docker compose 项目尽量不要用 docker-compose down 命令关闭项目,使用 docker-compose rm -svf 可以触发优雅停机),造成用户请求失败,在此期间允许完成现有请求但不允许新请求,配置如下:- <dependency>
- <groupId>io.netty</groupId>
- <artifactId>netty-all</artifactId>
- </dependency>
复制代码 十一. nginx配置通用请求后缀
先说下这个配置产生得前提,博主公司pc客户项目是基于 electron 打包得网页项目,每次项目大版本更新时,为了做好兼容性,防止客户端网页缓存等,会使用一个新网页地址,打个比方:
老网页地址,v1.1.0 版本网页访问地址:http://api.dev.com/pageV110
新网页地址,v1.2.0 版本网页访问地址:http://api.dev.com/pageV120
那么项目得nginx配置则则需要新加一个 v1.2.0 得配置如下:- server: shutdown: "graceful"
复制代码 那么博主在每次项目发布得时候就需要配合前端发版,配置一个新网页,故产生了这个通用配置得需求,如下:- server {
- listen 80;
- server_name api.dev.com;
- client_max_body_size 10m;
- # 老网页v1.1.0配置
- location ~ ^/pageV110 {
- alias /home/wwwroot/api.dev.com/pageV110;
- index index.html index.htm;
- }
-
- # 新网页v1.2.0配置
- location ~ ^/pageV120 {
- alias /home/wwwroot/api.dev.com/pageV120;
- index index.html index.htm;
- }
- }
复制代码 在 nginx 配置文件语法中,location 语句可以使用正则表达式,定义 set $s $1 变量,实现了通用配置
十二. 关于开发人员的自我提升和突破
博主这里主要总结了四点:
- 多和他人沟通,沟通能把复杂问题简单化,有时候开发阶段一个需求多问几句,可以减少因为个人理解差异导致的需求不一致问题,进而减少开发时间
- 建立长短期目标,观看技术视频、书籍给自己充电,比如7天利用业余时间看完一本电子书,三十天从零开始一个新项目等
- 善于总结,对于项目中的疑难bug,踩坑点要有记录,防止下次遇到再掉坑里
- 敢于尝试、担责,对项目、代码里明确不合理的地方要敢于跟他人沟通,修改问题代码,达到优化目的。对于自己造成的问题要承担,不要推卸责任。对于线上问题要重视,优先解决线上问题。
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