VMware WorkStation的烦心事

时间  2019-11-24
标签 vmware workstation 烦心事 栏目 虚拟机 繁體版
原文   原文链接

diary_report.jpg
###Interesting things

有2天没有写diary report了，由于这几天都在火车上颠簸。上个星期五晚上9点的火车从广州到武汉，星期日在学校考试，而后晚上9点的火车又匆忙的赶回广州。今天是8点30赶到的广州，很累。今天老大给我布置了一个新的Task，实现FastDFS的集群和负载均衡。看来今天是要加班的，FastDFS对我来讲是一个未知的领域，Spring Security 和 Filter、Interceptor的demo尚未写出来。(目测又要delay)个人时间计划表是天天6点30起床，晚上加班到10点(正常是6点)，笨鸟先飞。html

###What did you do todayjava

  • 可插拔性，在软件系统的设计中，可插拔是一个重要特性。它意味着给系统添加新功能的时候(或者将原来功能的实现替换成新的实现而保持接口不变)，不改变系统已有的功能。web

  • CMD (Common Module Definition)：公共模块定义，对于模块的依赖，CMD是延迟执行，推崇依赖就近。spring

  • 今天安装VMware Workstation，这个玩意大学上嵌入式的时候用过(设置ip和掩码：ifconfig eth0 192.168.1.2 netmask 255.255.255.0就是这样用，设置的ip是一次性，重启虚拟机后就失效， 设置网关：route add default gw 192.168.1.1)，但是在我本身的笔记本我一直用Virtural Box。用起来Vmware还真不习惯，首先遇到一个问题就是虚拟机ping不一样主机(真尼玛蛋疼)，因此记录一下。vim

  • 进入虚拟机设置，把网络链接设置为桥接模式。 tomcat

    image.png

    • 点“高级”按钮，记录咱们的MAC地址00:0C:29:67:76:2F bash

      image.png

    • 若是/etc/sysconfig/network-scripts目录没有ifcfg-eth0文件，那么咱们就建立ifcfg-eth0文件，cd /etc/sysconfig/network-scripts, touch ifcfg-eth0网络

    • vi ifcfg-eth0 ,对这个文件进行编辑。具体的编辑内容能够参考图片。 session

      image.png

    • vi /etc/resolv.conf 进入resolv.conf文件设置dns。 mvc

      image.png

    • vim /etc/rc.d/rc.local，配置ifup eth0，让开始时重启eth0。

      image.png

    • 重启网络服务，service network restart

      image.png

    • 咱们满怀期待的输入ping 192.168.12.61(这个是主机地址)，而后结果啪啪啪打脸，根本就ping不通嘛。

      image.png

    • 左思右想一下，发现是本地防火墙开启的问题，那么咱们关掉防火墙再试一试。果真是防火墙的问题，草他妈。

      image.png

    • 咱们本地的防火墙确定不能关闭，那么有没有一种策略，能实现虚拟机ping通主机同时又保证本地防火墙保持开启状态呢？确定是有的，打开Windows防火墙，找到高级设置。

      image.png

    • 咱们在入站规则中找到“文件和打印机共享(回显请求 - ICMPv4-In)”，而后启动该规则便可解决问题。

      image.png

    • 可是咱们又发现一个问题，咱们ping不通www.baidu.com，这个问题就很操蛋了。

      image.png

    • 咱们只须要把nameserver 设置为 114.114.114.114就能解决虚拟机ping不通外网的问题。

      image.png
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  • 关于<mvc:annotation-driven />这个问题，咱们接着上一篇博客讲，我上一篇博客的观点出自于使用@Controller注解为何要配置<mvc:annotation-driven />，这篇博客做者的观点是"要使用spring mvc中的@Controller注解，就必需要配置<mvc:annotation-driven />，不然org.springframework.web.servlet.DispatcherServlet没法找到控制器并把请求分发到控制器。" 当我刚开始学习SpringMVC的时候，就看过这篇文章，这篇文章某些观点的确解决了个人一些开发问题，可是我上面列举的做者观点就错的有点离谱。 下面我就用代码去证实这个观点是错的！

    • 咱们在spring-servlet注释<mvc:annotation-driven />这一行代码。
      image.png
    • 定义一个MvcAnnotationDrivenTestController
@RequestMapping("/mvc")
@Controller
public class MvcAnnotationDrivenTestController {

    @RequestMapping(value = "/testMvcAnnotationDriven", method = RequestMethod.GET)
    public ModelAndView testMvcAnnotationDriven() {
        return new ModelAndView("mvc_annotation_driven_test");
    }
}
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  • 在/WEB-INF/jsp/下面，定义mvc_annotation_driven_test.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
    <head>
        <title>mvc_annotation_driven_test</title>
    </head>
    <body>
        hello, this is mvc_annotation_driven_test
    </body>
</html>
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  • 咱们启动tomcat，输入http://localhost:8080/mvc/testMvcAnnotationDriven，咱们就证实了"使用spring mvc中的@Controller注解，就必需要配置<mvc:annotation-driven />" 这个观点是错的了。
    image.png
  • 接下来咱们在定义一个TestController，咱们能够提供一个问题：“若是不在spring-servlet文件中配置<mvc:annotation-driven />，咱们能成功的去访问http://localhost:8080/test/interceptor1这个连接吗？” 答案是不能访问！！！
@RestController
@RequestMapping("/test")
public class TestController {

    @GetMapping("/interceptor1")
    public String testInterceptor1(HttpSession session) {
        session.setAttribute("test1", "interceptor1");
        session.invalidate();
        return "testInterceptor1";
    }

    @GetMapping("/interceptor2")
    public String testInterceptor2(HttpSession session) {
        session.setAttribute("test2", "interceptor2");
        session.invalidate();
        return "testInterceptor2";
    }
}
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* 会抛出"[20:02:37:859] [WARN] - org.springframework.web.servlet.DispatcherServlet.noHandlerFound(DispatcherServlet.java:1176) - No mapping found for HTTP request with URI [/test/interceptor1] in DispatcherServlet with name 'filter_interceptor_mvc'"这个错误，形成404。
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image.png

  • 咱们能够去官方的一些文档找到答案。mvc:annotation-driven/实际上是毫无心义的。它声明了对注解驱动(@RequestMapping, @Controller)的mvc控制器的显式支持，尽管对这些的支持是默认行为。
<mvc:annotation-driven /> is actually rather pointless. It declares explicit support for annotation-driven MVC controllers (i.e.@RequestMapping, @Controller, etc), even though support for those is the default behaviour.
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My advice is to always declare <context:annotation-config>, but don't bother with <mvc:annotation-driven /> unless you want JSON support via Jackson. 复制代码

  • 我想上面的解释能解开大家心中的疑惑。美滋滋!

  • 接下来的篇幅会讲Listener、Filter、Interceptor的demo(终于能够还债了)。

    • 建立TestInterceptor一、TestInterceptor2。
@Slf4j
public class TestInterceptor1 extends HandlerInterceptorAdapter {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        log.info("TestInteceptor1 preHandle");

        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        log.info("TestInterceptor1 postHandle");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        log.info("TestInterceptor1 afterCompletion");
    }
}
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@Slf4j
public class TestInterceptor2 extends HandlerInterceptorAdapter {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        log.info("TestInterceptor2 preHandle");

        return false;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        log.info("TestInterceptor2 postHandle");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        log.info("TestInterceptor2 afterCompletion");
    }
}
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  • 建立TestFilter一、TestFilter2。
@Slf4j
public class TestFilter1 extends OncePerRequestFilter {
    private String username;
    private String password;

    public TestFilter1() {}

    public TestFilter1(String username, String password) {
        this.username = username;
        this.password = password;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {
        log.info("TestFilter1 doFilterInternal started, username = {} , password = {} ", username, password);
        filterChain.doFilter(httpServletRequest, httpServletResponse);
        log.info("TestFilter1 doFilterInternal end, username = {} , password = {}", username, password);
    }
}

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@Slf4j
public class TestFilter2 extends OncePerRequestFilter {
    private String username;
    private String password;

    public TestFilter2() {}

    public TestFilter2(String username, String password) {
        this.username = username;
        this.password = password;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {
        log.info("TestFilter2 doFilterInternal started");
        filterChain.doFilter(httpServletRequest, httpServletResponse);
        log.info("TestFilter2 doFilterInternal end");
    }
}
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  • 建立ContextListener、RequestListener、RequestAttributeListener、SessionListener。
@Slf4j
public class ContextListener implements ServletContextListener {

    @Override
    public void contextInitialized(ServletContextEvent servletContextEvent) {
        log.info("context initialized");
    }

    @Override
    public void contextDestroyed(ServletContextEvent servletContextEvent) {
        log.info("context destroyed");
    }

}

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@Slf4j
public class RequesListener implements ServletRequestListener {

    @Override
    public void requestDestroyed(ServletRequestEvent servletRequestEvent) {
        log.info("request destroyed");
    }

    @Override
    public void requestInitialized(ServletRequestEvent servletRequestEvent) {
        log.info("request initialized");
    }
}
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@Slf4j
public class RequestAttributeListener implements ServletRequestAttributeListener {

    @Override
    public void attributeAdded(ServletRequestAttributeEvent servletRequestAttributeEvent) {
        log.info("attribute added");
    }

    @Override
    public void attributeRemoved(ServletRequestAttributeEvent servletRequestAttributeEvent) {
        log.info("attribute removed");
    }

    @Override
    public void attributeReplaced(ServletRequestAttributeEvent servletRequestAttributeEvent) {
        log.info("attribute replaced");
    }
}
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@Slf4j
public class SessionListener implements HttpSessionListener {

    @Override
    public void sessionCreated(HttpSessionEvent httpSessionEvent) {
        log.info("session created");
    }

    @Override
    public void sessionDestroyed(HttpSessionEvent httpSessionEvent) {
        log.info("session destroyed");
    }
}
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  • 在web.xml配置Filter、Listener
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">

    <display-name>filter_interceptor</display-name>
    <welcome-file-list>
        <welcome-file>cmazxiaoma.jsp</welcome-file>
    </welcome-file-list>

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            classpath:spring-config.xml
        </param-value>
    </context-param>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <listener>
        <listener-class>org.springframework.web.context.ContextCleanupListener</listener-class>
    </listener>

    <listener>
        <listener-class>com.cmazxiaoma.demo.listener.ContextListener</listener-class>
    </listener>
    
    <listener>
        <listener-class>com.cmazxiaoma.demo.listener.RequesListener</listener-class>
    </listener>

    <listener>
        <listener-class>com.cmazxiaoma.demo.listener.RequestAttributeListener</listener-class>
    </listener>
    
    <listener>
        <listener-class>com.cmazxiaoma.demo.listener.SessionListener</listener-class>
    </listener>

    <servlet>
        <servlet-name>filter_interceptor_mvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-servlet.xml</param-value>
        </init-param>

        <init-param>
            <param-name>detectAllHandlerExceptionResolvers</param-name>
            <param-value>false</param-value>
        </init-param>

        <load-on-startup>1</load-on-startup>
        <async-supported>true</async-supported>
    </servlet>

    <servlet-mapping>
        <servlet-name>filter_interceptor_mvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <filter>
        <filter-name>characterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <async-supported>true</async-supported>

        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>

        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>

    </filter>

    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
    <filter>
        <filter-name>testFilter1</filter-name>
        <filter-class>com.cmazxiaoma.demo.filter.TestFilter1</filter-class>
        <async-supported>true</async-supported>
        
        <init-param>
            <param-name>username</param-name>
            <param-value>testFilter1</param-value>
        </init-param>

        <init-param>
            <param-name>password</param-name>
            <param-value>123</param-value>
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>testFilter1</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
   
    <filter>
        <filter-name>testFilter2</filter-name>
        <filter-class>com.cmazxiaoma.demo.filter.TestFilter2</filter-class>
        <async-supported>true</async-supported>

        <init-param>
            <param-name>username</param-name>
            <param-value>testFilter2</param-value>
        </init-param>

        <init-param>
            <param-name>password</param-name>
            <param-value>456</param-value>
        </init-param>
    </filter>
    
    <filter-mapping>
        <filter-name>testFilter2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>
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  • 在servlet-servlet中配置Interceptor。
<mvc:interceptors>

        <mvc:interceptor>
            <mvc:mapping path="/test/interceptor1"/>
            <bean class="com.cmazxiaoma.demo.interceptor.TestInterceptor1" />
        </mvc:interceptor>
        
        <mvc:interceptor>
            <mvc:mapping path="/test/interceptor2"/>
            <bean class="com.cmazxiaoma.demo.interceptor.TestInterceptor2" />
        </mvc:interceptor>
    </mvc:interceptors>
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  • 咱们输入http://localhost:8080/test/interceptor1，观看控制台打出的log和返回的视图。
[21:19:03:666] [INFO] - com.cmazxiaoma.demo.listener.RequesListener.requestInitialized(RequesListener.java:18) - request initialized
[21:19:03:666] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:03:666] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:03:667] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:03:667] [INFO] - com.cmazxiaoma.demo.filter.TestFilter1.doFilterInternal(TestFilter1.java:44) - TestFilter1 doFilterInternal started, username = testFilter1 , password = 123 
[21:19:03:667] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:03:667] [INFO] - com.cmazxiaoma.demo.filter.TestFilter2.doFilterInternal(TestFilter2.java:42) - TestFilter2 doFilterInternal started
[21:19:03:680] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:03:680] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:03:680] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:03:681] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:03:681] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:03:681] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:03:685] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:03:686] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:03:686] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:03:691] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:03:691] [INFO] - com.cmazxiaoma.demo.interceptor.TestInterceptor1.preHandle(TestInterceptor1.java:15) - TestInteceptor1 preHandle
[21:19:03:705] [INFO] - com.cmazxiaoma.demo.listener.SessionListener.sessionDestroyed(SessionListener.java:18) - session destroyed
[21:19:03:718] [INFO] - com.cmazxiaoma.demo.interceptor.TestInterceptor1.postHandle(TestInterceptor1.java:22) - TestInterceptor1 postHandle
[21:19:03:718] [INFO] - com.cmazxiaoma.demo.interceptor.TestInterceptor1.afterCompletion(TestInterceptor1.java:27) - TestInterceptor1 afterCompletion
[21:19:03:719] [INFO] - com.cmazxiaoma.demo.filter.TestFilter2.doFilterInternal(TestFilter2.java:44) - TestFilter2 doFilterInternal end
[21:19:03:719] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeRemoved(RequestAttributeListener.java:18) - attribute removed
[21:19:03:719] [INFO] - com.cmazxiaoma.demo.filter.TestFilter1.doFilterInternal(TestFilter1.java:46) - TestFilter1 doFilterInternal end, username = testFilter1 , password = 123
[21:19:03:719] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeRemoved(RequestAttributeListener.java:18) - attribute removed
[21:19:03:719] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeRemoved(RequestAttributeListener.java:18) - attribute removed
[21:19:03:719] [INFO] - com.cmazxiaoma.demo.listener.RequesListener.requestDestroyed(RequesListener.java:13) - request destroyed
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image.png

  • 咱们输入http://localhost:8080/test/interceptor2，控制台打出的log和返回的视图。
    image.png 
[21:19:46:054] [INFO] - com.cmazxiaoma.demo.listener.RequesListener.requestInitialized(RequesListener.java:18) - request initialized
[21:19:46:055] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:46:056] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:46:056] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:46:056] [INFO] - com.cmazxiaoma.demo.filter.TestFilter1.doFilterInternal(TestFilter1.java:44) - TestFilter1 doFilterInternal started, username = testFilter1 , password = 123 
[21:19:46:056] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:46:057] [INFO] - com.cmazxiaoma.demo.filter.TestFilter2.doFilterInternal(TestFilter2.java:42) - TestFilter2 doFilterInternal started
[21:19:46:057] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:46:057] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:46:058] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:46:058] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:46:059] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:46:059] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:46:059] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:46:060] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:46:060] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:46:061] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeAdded(RequestAttributeListener.java:13) - attribute added
[21:19:46:061] [INFO] - com.cmazxiaoma.demo.interceptor.TestInterceptor2.preHandle(TestInterceptor2.java:15) - TestInterceptor2 preHandle
[21:19:46:061] [INFO] - com.cmazxiaoma.demo.filter.TestFilter2.doFilterInternal(TestFilter2.java:44) - TestFilter2 doFilterInternal end
[21:19:46:062] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeRemoved(RequestAttributeListener.java:18) - attribute removed
[21:19:46:062] [INFO] - com.cmazxiaoma.demo.filter.TestFilter1.doFilterInternal(TestFilter1.java:46) - TestFilter1 doFilterInternal end, username = testFilter1 , password = 123
[21:19:46:062] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeRemoved(RequestAttributeListener.java:18) - attribute removed
[21:19:46:062] [INFO] - com.cmazxiaoma.demo.listener.RequestAttributeListener.attributeRemoved(RequestAttributeListener.java:18) - attribute removed
[21:19:46:063] [INFO] - com.cmazxiaoma.demo.listener.RequesListener.requestDestroyed(RequesListener.java:13) - request destroyed
复制代码

  • 经过对比log和返回的视图，咱们发现了Interceptor1执行了preHandler()、postHandler()、afterCompletion()这三个方法，而Interceptor2只执行了preHandler()这个方法。经过比较它们的源码，咱们发现了Interceptor1的preHandler()返回的是true，而Interceptor2的preHandler()返回的是false。而第一个url咱们拦截了请求，返回了视图，第二个url咱们拦截了请求，返回没有视图。

  • preHandle方法是进行处理拦截用的，该方法将在Controller处理以前调用，Interceptor拦截器是链式的，而且能够中断，当返回false的时候整个请求结束。

  • 当preHandle返回true时，postHandle()才会执行，在Controller的方法调用以后执行，可是它会在DispatcherServlet进行视图的渲染以前执行。

  • 当preHandle返回ture才会执行，该方法将在整个请求完成以后，也就是DispatcherServlet渲染视完毕才执行，主要做用是情理资源。

  • 从启动日志来看，Listener > Filter > Interceptor > Servlet，自定义Listener和Filter很简单，也不须要讲。

###What to do tomorrow

  • 明天去看FastDFS的集群和负载均衡，Spring Security的demo又要delay了。

###Summary

笨鸟先飞

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