IT修真院·坑乎 | Java(后端),CSS(前端),JavaScript(前端),PM(产品经理),UI(交互设计),QA(测试),Android(安卓APP),iOS(苹果APP),OP(运维),Python(后端)日常在线问答学习平台

MySQL的多表查询，需要设置缓存吗？

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1

数据库

class="cursor-pointer"> 详细描述

使用maven插件打包的三种方式，在项目中哪种应用的多？原因是什么？

1

maven

class="cursor-pointer"> 详细描述

mybatis配置文件

1

springRMI

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class="cursor-pointer"> 错误截图

关于敏捷开发的代码环节，大家彼此之间（比如后端之间）怎么合作的？

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1

复盘踩坑

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页面点击发送验证码，无法保持页面（跳转或更新）

1

第三方API调用

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class="cursor-pointer"> 错误截图

垂纶小室中艺术家信息模块该如何处理

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1

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

quartz 如何让定时任务全部执行完毕后自动关闭

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1

quartz

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 源码

public static void main(String[] args) throws SchedulerException {
    //创建一个jobDetail的实例，将该实例与HelloJob Class绑定
      JobDetail jobDetail= JobBuilder.newJob(QuartzDemo.class).withIdentity("my job").build();
      //cronTrigger   cron表达式 0 0/5 18 * * ? 每天18点到18.59 每隔5分钟触发
    // https://www.pppet.net/ 在线cron表达式编写
    CronTrigger cronTrigger=TriggerBuilder.newTrigger().withIdentity("cronTrigger")
            .withSchedule(CronScheduleBuilder.cronSchedule("0 0/1 19 * * ?")).build();

            //创建schedule实例
        StdSchedulerFactory factory=new StdSchedulerFactory();
        Scheduler scheduler=factory.getScheduler();
        scheduler.start();
        scheduler.scheduleJob(jobDetail,cronTrigger);
}

Tiles框架的疑问

2

1

tiles

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如何发送验证码

1

第三方API调用

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class="cursor-pointer"> 错误截图

Controller中，访问带有占位符的uri地址时，浏览器输不能识别

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1

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

DispatcherServlet with name 'springmvc-dispatcher' processing GET request for [/json/categorys/%7BuperId%7D/2]
[DEBUG] 2019-08-14 09:24:58,018 method:org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:310)
Looking up handler method for path /json/categorys/{uperId}/2
[DEBUG] 2019-08-14 09:24:58,033 method:org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:317)
Returning handler method [public java.util.Map<java.lang.String, com.jnshu.pojo.Category> com.jnshu.controller.JsonController.getFirstCategory(java.lang.Integer)]
[DEBUG] 2019-08-14 09:24:58,033 method:org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:251)
Returning cached instance of singleton bean 'jsonController'
[DEBUG] 2019-08-14 09:24:58,034 method:org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:955)
Last-Modified value for [/json/categorys/%7BuperId%7D/2] is: -1
[DEBUG] 2019-08-14 09:24:58,078 method:org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:164)
Failed to resolve argument 0 of type 'java.lang.Integer'
org.springframework.web.method.annotation.MethodArgumentTypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'java.lang.Integer'; nested exception is java.lang.NumberFormatException: For input string: "{uperId}"
    at org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.resolveArgument(AbstractNamedValueMethodArgumentResolver.java:128)
    at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:121)
    at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:158)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:128)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
    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:52)
    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:199)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:660)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:798)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:808)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
    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)
Caused by: java.lang.NumberFormatException: For input string: "{uperId}"
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    at java.lang.Integer.parseInt(Integer.java:580)
    at java.lang.Integer.valueOf(Integer.java:766)
    at org.springframework.util.NumberUtils.parseNumber(NumberUtils.java:208)
    at org.springframework.beans.propertyeditors.CustomNumberEditor.setAsText(CustomNumberEditor.java:113)
    at org.springframework.beans.TypeConverterDelegate.doConvertTextValue(TypeConverterDelegate.java:468)
    at org.springframework.beans.TypeConverterDelegate.doConvertValue(TypeConverterDelegate.java:441)
    at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:199)
    at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:108)
    at org.springframework.beans.TypeConverterSupport.doConvert(TypeConverterSupport.java:64)
    at org.springframework.beans.TypeConverterSupport.convertIfNecessary(TypeConverterSupport.java:47)
    at org.springframework.validation.DataBinder.convertIfNecessary(DataBinder.java:713)
    at org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.resolveArgument(AbstractNamedValueMethodArgumentResolver.java:120)
    ... 36 more
[DEBUG] 2019-08-14 09:24:58,080 method:org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver.resolveException(AbstractHandlerExceptionResolver.java:133)
Resolving exception from handler [public java.util.Map<java.lang.String, com.jnshu.pojo.Category> com.jnshu.controller.JsonController.getFirstCategory(java.lang.Integer)]: org.springframework.web.method.annotation.MethodArgumentTypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'java.lang.Integer'; nested exception is java.lang.NumberFormatException: For input string: "{uperId}"
[DEBUG] 2019-08-14 09:24:58,083 method:org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver.resolveException(AbstractHandlerExceptionResolver.java:133)
Resolving exception from handler [public java.util.Map<java.lang.String, com.jnshu.pojo.Category> com.jnshu.controller.JsonController.getFirstCategory(java.lang.Integer)]: org.springframework.web.method.annotation.MethodArgumentTypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'java.lang.Integer'; nested exception is java.lang.NumberFormatException: For input string: "{uperId}"
[DEBUG] 2019-08-14 09:24:58,083 method:org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver.resolveException(AbstractHandlerExceptionResolver.java:133)
Resolving exception from handler [public java.util.Map<java.lang.String, com.jnshu.pojo.Category> com.jnshu.controller.JsonController.getFirstCategory(java.lang.Integer)]: org.springframework.web.method.annotation.MethodArgumentTypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'java.lang.Integer'; nested exception is java.lang.NumberFormatException: For input string: "{uperId}"
[DEBUG] 2019-08-14 09:24:58,084 method:org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver.resolveException(AbstractHandlerExceptionResolver.java:133)
Resolving exception from handler [public java.util.Map<java.lang.String, com.jnshu.pojo.Category> com.jnshu.controller.JsonController.getFirstCategory(java.lang.Integer)]: org.springframework.web.method.annotation.MethodArgumentTypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'java.lang.Integer'; nested exception is java.lang.NumberFormatException: For input string: "{uperId}"
[DEBUG] 2019-08-14 09:24:58,084 method:org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver.resolveException(AbstractHandlerExceptionResolver.java:133)
Resolving exception from handler [public java.util.Map<java.lang.String, com.jnshu.pojo.Category> com.jnshu.controller.JsonController.getFirstCategory(java.lang.Integer)]: org.springframework.web.method.annotation.MethodArgumentTypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'java.lang.Integer'; nested exception is java.lang.NumberFormatException: For input string: "{uperId}"
[DEBUG] 2019-08-14 09:24:58,084 method:org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver.resolveException(AbstractHandlerExceptionResolver.java:133)
Resolving exception from handler [public java.util.Map<java.lang.String, com.jnshu.pojo.Category> com.jnshu.controller.JsonController.getFirstCategory(java.lang.Integer)]: org.springframework.web.method.annotation.MethodArgumentTypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'java.lang.Integer'; nested exception is java.lang.NumberFormatException: For input string: "{uperId}"
[DEBUG] 2019-08-14 09:24:58,084 method:org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver.resolveException(AbstractHandlerExceptionResolver.java:133)
Resolving exception from handler [public java.util.Map<java.lang.String, com.jnshu.pojo.Category> com.jnshu.controller.JsonController.getFirstCategory(java.lang.Integer)]: org.springframework.web.method.annotation.MethodArgumentTypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'java.lang.Integer'; nested exception is java.lang.NumberFormatException: For input string: "{uperId}"
[WARN ] 2019-08-14 09:24:58,119 method:org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver.handleTypeMismatch(DefaultHandlerExceptionResolver.java:361)
Failed to bind request element: org.springframework.web.method.annotation.MethodArgumentTypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'java.lang.Integer'; nested exception is java.lang.NumberFormatException: For input string: "{uperId}"
[DEBUG] 2019-08-14 09:24:58,120 method:org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1048)
Null ModelAndView returned to DispatcherServlet with name 'springmvc-dispatcher': assuming HandlerAdapter completed request handling
[DEBUG] 2019-08-14 09:24:58,120 method:org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1000)
Successfully completed request

class="cursor-pointer"> 源码

/*由一级目录查看二级目录*/
@RequestMapping(value = "/categorys/{uperId}/2",method = RequestMethod.GET)@ResponseBodypublic 
Map<String, Category> getFirstCategory(@PathVariable Integer uperId){    
Map<String,Category> categorys = new HashMap<>();    
if(uperId==1){        
Category c1 = new Category();        
c1.setId(4);        
c1.setName("李白");        
c1.setUpperId(0);        
Category c2 = new Category();       
 c2.setId(5);        
c2.setName("杜甫");       
 c2.setUpperId(0);        
Category c3 = new Category();       
 c3.setId(6);       
 c3.setName("白居易");        
c3.setUpperId(0);        
categorys.put("诗人1",c1);        
categorys.put("诗人2",c2);        
categorys.put("诗人3",c3);        
return categorys;    
}else {        
Category c1 = new Category();        c1.setId(7);        c1.setName("唐伯虎");        c1.setUpperId(0);        Category c2 = new Category();        c2.setId(8);        c2.setName("祝枝山");        c2.setUpperId(0);        Category c3 = new Category();        c3.setId(9);        c3.setName("张择端");        c3.setUpperId(0);        categorys.put("画家1",c1);        categorys.put("画家2",c2);        categorys.put("画家3",c3);        return categorys;    }}