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三层架构中使用策略模式，会使得三层架构中使用DAO层出现异常

1

1

第三方API调用

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

controller
	// 执行上传图片到阿里云
	@RequestMapping(value = "/uploadToAliYun", method = RequestMethod.POST)
	@ResponseBody
	public void userPhotoUploadToALiYun(@RequestParam("file") MultipartFile file, HttpServletRequest request,
										HttpServletResponse response) throws IOException {

		String result = null;
		// 使用策略模式
		UserPhotoUploadStrategyContext context = new UserPhotoUploadStrategyContext(new UserPhotoUploadToAliYunOSSImpl());
		context.executeUserPhotoUploadStrategy(request,response,file);

		// 上传文件
		// result = userPhotoUploadToAliYunOSS.userPhotoUploadToOSS(request, response, file);
		PrintWriter out = response.getWriter();
		out.print(result);
		out.flush();
		out.close();
		logger.info("上传阿里云返回结果：" + result );

	}


services:
public interface UserPhotoUploadStrategy {


	String userPhotoUploadToOSS(HttpServletRequest request, HttpServletResponse response,
								MultipartFile file) throws IOException;

}


实现类：

	/**
	 *
	 * @param request 请求信息
	 * @param response 响应信息
	 * @param file 文件输入流
	 * @return key 存在于OSS 的键值
	 * @throws IOException IO流异常
	 */
	@Override
	public String userPhotoUploadToOSS(HttpServletRequest request, HttpServletResponse response,
									   MultipartFile file) throws IOException {

		applicationContext.getBean("oSSUtilsByALiYun");

		String key = "";
		String result ="";

				// 获取上传前源文件名、文件大小
		String originalFileName = file.getOriginalFilename();
		Long originalFileSize  = file.getSize();
		logger.info("上传前的文件名：" + originalFileName);

		// 将 multipartfilein 转化为 inputstream流
		CommonsMultipartFile cFile = (CommonsMultipartFile) file;
		DiskFileItem fileItem = (DiskFileItem) cFile.getFileItem();
		InputStream inputStream = fileItem.getInputStream();

		if (!file.isEmpty()){
			OSSClient ossClient = task07.util.aliyun.oss.OSSUtilsByALiYun.getOSSClient();
			String newFileName = null;
			if (originalFileName.length()>0){
				newFileName = UUID.randomUUID() +"";
			}
			// 将文件上传并获得返回值 key(文件名称)
			key = OSSUtilsByALiYun.uploadObject2OSS(ossClient, inputStream,
					OSSUtilsByALiYun.getBucketName(), originalFileName,newFileName,
					originalFileSize,OSSUtilsByALiYun.getFolder());

		}
		//将文件名写入数据库
		if (!key.equals("")){
			HttpSession userNamesession =request.getSession();
			String userName = (String) userNamesession.getAttribute("userName");

			if (userName.equals(null)){
				logger.info("写入数据库出错，用户名为 null");

			}

			logger.info("userName:" + userName );
			logger.info("key:" + key );

			System.out.println(userLoginDao);
			System.out.println(userLoginDao.queryByName(userName).toString());
			userLoginDao.updateHeadPhoto(userName,key);

			UserLogin userLoginText = userLoginDao.queryByName(userName);
			String databaseHeadPho =  userLoginText.getHead_photo();
			logger.info("写入数据库的key 值为： " + databaseHeadPho);
			// 将 key 值写入数据库


			if (databaseHeadPho.equals(key)){
				logger.info("写入文件一致，上传成功！");
				result = "文件上传成功!";
			}else{
				result = "上传成功，写入数据库不一致!";
			}


		}else {
			logger.info("文件上传失败！");
			result = "文件上传失败!";
		}

		return result;
	}
}
 
策略模式的context :
public class UserPhotoUploadStrategyContext {


	private UserPhotoUploadStrategy userPhotoUploadStrategy;


	public UserPhotoUploadStrategyContext( UserPhotoUploadStrategy userPhotoUploadStrategy){
		this.userPhotoUploadStrategy = userPhotoUploadStrategy;
	}

	public String executeUserPhotoUploadStrategy(HttpServletRequest request, HttpServletResponse response,
												 MultipartFile file) throws IOException {
		System.out.println("context 之前");

		return userPhotoUploadStrategy.userPhotoUploadToOSS(request, response, file);
	}

}

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restful的风格GET不到请求

0

1

rest

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

  @RequestMapping(value = "/student/{id}",method =RequestMethod.GET)
    public String getStu(@PathVariable Long id, Model model) {
//        if (stu.getStuById(id)!=null){
        logger.info("Processing trade with id: {}  ", id);
        model.addAttribute("student", stu.getStuById(id));
        return "message";
//        else
//            return "error";

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tomcat不能访问静态文件html

0

1

jetty/tomcat SSM

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

该问题已被官方收录

jetty部署后无法启动端口，显示端口被占用

0

1

jetty/tomcat

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

  <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
                <exclusions>
                    <exclusion>
                        <groupId>org.springframework.boot</groupId>
                        <artifactId>spring-boot-starter-tomcat</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>

            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-jetty</artifactId>
                <exclusions>
                    <exclusion>
                        <groupId>org.eclipse.jetty.websocket</groupId>
                        <artifactId>*</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>

该问题已被官方收录

使用SpringAOP时无法成功使用切面类

1

1

aop

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

package jnshu.model.aopTool;

import org.apache.log4j.Logger;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;

/**
 * API接口性能分析
 */
@Aspect
public class TimerAspect {
    private static Logger logger = Logger.getLogger (TimerAspect.class);//引入日志配置
    /**
     * 定义切点函数
     */
    @Pointcut("execution(* jnshu.controller.*.*(..))||execution(* jnshu.service.*.*(..))")
    void timer() {
    }

    @Around("timer()")
    public Object logTimer(ProceedingJoinPoint thisJoinPoint) throws Throwable {

//        MonitorTime monitorTime=new MonitorTime();
        //获取目标类名称
        String clazzName = thisJoinPoint.getTarget().getClass().getName();
        //获取目标类方法名称
        String methodName = thisJoinPoint.getSignature().getName();

        // 计时并调用目标函数
        long start = System.currentTimeMillis();
        Object result = thisJoinPoint.proceed();
        long time = System.currentTimeMillis() - start;
//        System.out.println (result.toString ());
        logger.warn ("执行"+clazzName+"中的方法"+methodName+"消耗时间为："+time);
        return result;
    }
}

该问题已被官方收录

用管理员权限打不开数据库

1

1

数据库

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

该问题已被官方收录

时间戳到底是用了什么进行方法的运用呢？

0

1

会话管理

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

该问题已被官方收录

使用Jmeter压测的时候报错

1

1

压测

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

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无法连接到redis缓存服务器

2

1

redis

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

该问题已被官方收录

做Redis缓存配置时，Spring找不到Redis的连接配置

2

1

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

26-Nov-2018 08:51:25.731 信息 [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.ApplicationContext.log No Spring WebApplicationInitializer types detected on classpath
26-Nov-2018 08:51:25.818 信息 [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.ApplicationContext.log Initializing Spring root WebApplicationContext
26-Nov-2018 08:51:28.723 严重 [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.StandardContext.listenerStart Exception sending context initialized event to listener instance of class [org.springframework.web.context.ContextLoaderListener]
 org.springframework.beans.factory.BeanDefinitionStoreException: Invalid bean definition with name 'poolConfig' defined in class path resource [spring-redis.xml]: Could not resolve placeholder 'redis.maxIdle' in string value "${redis.maxIdle}"; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'redis.maxIdle' in string value "${redis.maxIdle}"
	at org.springframework.beans.factory.config.PlaceholderConfigurerSupport.doProcessProperties(PlaceholderConfigurerSupport.java:211)
	at org.springframework.beans.factory.config.PropertyPlaceholderConfigurer.processProperties(PropertyPlaceholderConfigurer.java:222)
	at org.springframework.beans.factory.config.PropertyResourceConfigurer.postProcessBeanFactory(PropertyResourceConfigurer.java:86)
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:265)
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:162)
	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:606)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:462)
	at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
	at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
	at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4792)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5256)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:754)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:730)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)
	at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1736)
	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:483)
	at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
	at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
	at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:483)
	at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:432)
	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:483)
	at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
	at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
	at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1466)
	at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
	at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1307)
	at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1399)
	at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:828)
	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:483)
	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:323)
	at sun.rmi.transport.Transport$1.run(Transport.java:178)
	at sun.rmi.transport.Transport$1.run(Transport.java:175)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.Transport.serviceCall(Transport.java:174)
	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:557)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:812)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:671)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'redis.maxIdle' in string value "${redis.maxIdle}"
	at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:174)
	at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:126)
	at org.springframework.beans.factory.config.PropertyPlaceholderConfigurer$PlaceholderResolvingStringValueResolver.resolveStringValue(PropertyPlaceholderConfigurer.java:258)
	at org.springframework.beans.factory.config.BeanDefinitionVisitor.resolveStringValue(BeanDefinitionVisitor.java:282)
	at org.springframework.beans.factory.config.BeanDefinitionVisitor.resolveValue(BeanDefinitionVisitor.java:204)
	at org.springframework.beans.factory.config.BeanDefinitionVisitor.visitPropertyValues(BeanDefinitionVisitor.java:141)
	at org.springframework.beans.factory.config.BeanDefinitionVisitor.visitBeanDefinition(BeanDefinitionVisitor.java:82)
	at org.springframework.beans.factory.config.PlaceholderConfigurerSupport.doProcessProperties(PlaceholderConfigurerSupport.java:208)
	... 52 more

26-Nov-2018 08:51:28.728 信息 [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.ApplicationContext.log Closing Spring root WebApplicationContext

<?xml version="1.0" encoding="UTF-8"?>
<beans    xmlns="http://www.springframework.org/schema/beans"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xmlns:p="http://www.springframework.org/schema/p"
          xmlns:tx="http://www.springframework.org/schema/tx"
          xmlns:context="http://www.springframework.org/schema/context"
          xsi:schemaLocation="
      http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
      http://www.springframework.org/schema/tx
      http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
      http://www.springframework.org/schema/context
      http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <context:component-scan base-package="jnshu"/>
    <context:property-placeholder location="classpath:redis.properties" ignore-unresolvable="true"/>
    <!--设置数据池-->
    <bean id="poolConfig"  class="redis.clients.jedis.JedisPoolConfig">
        <property name="maxIdle" value="${redis.maxIdle}"></property>
        <property name="minIdle" value="${redis.minIdle}"></property>
        <property name="maxTotal" value="${redis.maxTotal}"></property>
        <property name="maxWaitMillis" value="${redis.maxWaitMillis}"></property>
        <property name="testOnBorrow" value="${redis.testOnBorrow}"></property>
    </bean>
    <!--链接redis-->
    <bean id="connectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
        <property name="hostName" value="${redis.host}"></property>
        <property name="port" value="${redis.port}"></property>
        <!--<property name="password" value="${redis.password}"></property>-->
        <property name="poolConfig" ref="poolConfig"></property>
    </bean>

    <!-- redis 序列化策略 ，手动指定 key 采用String序列化策略 -->
    <bean id="stringSerializer" class="org.springframework.data.redis.serializer.StringRedisSerializer"/>

    <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">
        <property name="connectionFactory" ref="connectionFactory"/>
        <property name="keySerializer" ref="stringSerializer"/>
        <!-- 开启事务，可以通过transcational注解控制 -->
        <property name="enableTransactionSupport" value="true"/>
    </bean>
        <!--<property name="hashValueSerializer">
            <bean class="org.springframework.data.redis.serializer.StringRedisSerializer" />
        </property>-->
    <!--</bean>-->

</beans>

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