013-spring Boot Web "Two" static resources, Servlet, Filter, Listenter

First, static resources 1.1, webapp default support static resources

Establish user.html default support access under Src/main/webapp

1.2, the default built-in static resource directory. can be accessed directly

View Package: Spring-boot-autoconfigure-1.5.9.release.jar under: org.springframework.boot.autoconfigure.web;

View: ResourceProperties, where

    Private Static Final string[] Classpath_resource_locations = {            "classpath:/meta-inf/resources/", "classpath:/resources/" ,            " classpath:/static/"," classpath:/public/"};

By default, the above four directories can be accessed.

You can modify the configuration item in the Application.properties under Src/main/resources

spring.resources.staticlocations=classpath:/html/

Second, spring boot uses the servlet "original" since servlet3.x annotation function 2.1, using servlet

Create a new Userservlet.java

 PackageCom.lhx.spring.springboot_web_ext;Importjava.io.IOException;Importjavax.servlet.ServletException;ImportJavax.servlet.annotation.WebServlet;ImportJavax.servlet.http.HttpServlet;Importjavax.servlet.http.HttpServletRequest;Importjavax.servlet.http.HttpServletResponse; @WebServlet ("/user.do") Public classUserservletextendsHttpServlet {Private Static Final LongSerialversionuid = 1L; @Overrideprotected voidDoget (httpservletrequest req, HttpServletResponse resp)throwsservletexception, IOException {resp.getwriter (). Print ("User Servlet"); }}

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and add the servlet scan annotations on the startup class: Servletcomponentscan

@ServletComponentScan @springbootapplication  Public class App {    publicstaticvoid  main (string[] args) {        = Springapplication.run (App.class, args);         // context.close ();     }}

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Access can

2.2. Use Filter

Create a new Logfilter.java intercept user.do

 PackageCom.lhx.spring.springboot_web_ext;Importjava.io.IOException;ImportJavax.servlet.Filter;ImportJavax.servlet.FilterChain;ImportJavax.servlet.FilterConfig;Importjavax.servlet.ServletException;Importjavax.servlet.ServletRequest;ImportJavax.servlet.ServletResponse;Importjavax.servlet.annotation.WebFilter; @WebFilter ("/user.do") Public classLogfilterImplementsFilter {@Override Public voiddestroy () {//TODO auto-generated Method Stub} @Override Public voidDoFilter (ServletRequest arg0, Servletresponse arg1, Filterchain arg2)throwsIOException, servletexception {System.out.println ("Income log Filter" +arg0.getremotehost ());    Arg2.dofilter (arg0, arg1); } @Override Public voidInit (Filterconfig arg0)throwsservletexception {//TODO auto-generated Method Stub    }}

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You can run it now

2.3. Using listener

 PackageCom.lhx.spring.springboot_web_ext;Importjava.time.LocalDate;Importjavax.servlet.ServletContextEvent;ImportJavax.servlet.ServletContextListener;ImportJavax.servlet.annotation.WebListener; @WebListener Public classMycontextlistenerImplementsServletcontextlistener {@Override Public voidcontextdestroyed (servletcontextevent arg0) {//TODO auto-generated Method Stub} @Override Public voidcontextinitialized (servletcontextevent arg0) {System.out.println ("App startup at" +Localdate.now (). toString ()); }}

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You can run it now

Third, spring boot using the servlet "configuration" does not rely on Servlet3.0, using servlet2.x can use 3.1, using the servlet

Add Bookservlet.java, note no annotations

 PackageCom.lhx.spring.springboot_web_ext.servlet;Importjava.io.IOException;Importjavax.servlet.ServletException;ImportJavax.servlet.http.HttpServlet;Importjavax.servlet.http.HttpServletRequest;ImportJavax.servlet.http.HttpServletResponse; Public classBookservletextendsHttpServlet {Private Static Final LongSerialversionuid = 1L; @Overrideprotected voidDoget (httpservletrequest req, HttpServletResponse resp)throwsservletexception, IOException {System.out.println ("Test"); }}

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Add Configuration class, Servletconfiguration.java

 PackageCom.lhx.spring.springboot_web_ext.servlet;Importorg.springframework.boot.SpringBootConfiguration;ImportOrg.springframework.boot.web.servlet.ServletRegistrationBean;ImportOrg.springframework.context.annotation.Bean; @SpringBootConfiguration Public classservletcongfiguration {@Bean PublicServletregistrationbean Createbookservlet () {Servletregistrationbean servlet=NewServletregistrationbean (NewBookservlet (), "Book.do"); returnservlet; }}

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You can access it now.

3.2. Use filter

Increase Echofilter.java

 PackageCom.lhx.spring.springboot_web_ext.servlet;Importjava.io.IOException;ImportJavax.servlet.Filter;ImportJavax.servlet.FilterChain;ImportJavax.servlet.FilterConfig;Importjavax.servlet.ServletException;Importjavax.servlet.ServletRequest;ImportJavax.servlet.ServletResponse;Importjavax.servlet.http.HttpServletRequest; Public classEchofilterImplementsFilter {@Override Public voiddestroy () {//TODO auto-generated Method Stub} @Override Public voidDoFilter (ServletRequest arg0, Servletresponse arg1, Filterchain arg2)throwsIOException, servletexception {httpservletrequest req=(httpservletrequest) arg0; System.out.println ("Test" +Req.getrequesturi ());    Arg2.dofilter (arg0, arg1); } @Override Public voidInit (Filterconfig arg0)throwsservletexception {//TODO auto-generated Method Stub    }}

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In the configuration class, Servletconfiguration.java adds

    @Bean    public  Filterregistrationbean Createfilterregistrationbean () {          New  Filterregistrationbean ();        Filter.setfilter (new  echofilter ());        Filter.seturlpatterns (Arrays.aslist ("/book.do"));         return filter;    }

View Code3.3. Using Listner

Add Startuplistener. java

 PackageCom.lhx.spring.springboot_web_ext.servlet;Importjavax.servlet.ServletContextEvent;ImportJavax.servlet.ServletContextListener; Public classStartuplistenerImplementsServletcontextlistener {@Override Public voidcontextdestroyed (servletcontextevent arg0) {//TODO auto-generated Method Stub} @Override Public voidcontextinitialized (servletcontextevent arg0) {System.out.println ("================="); }}

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In the configuration class, Servletconfiguration.java adds

    @Bean    public servletlistenerregistrationbean<startuplistener>  Createservletlistenerregistrationbean () {        ServletlistenerregistrationbeanNew Servletlistenerregistrationbean<startuplistener> (new  Startuplistener ());         return Registrationbean;    }

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Note: Generally use 2 for annotations, because spring boot is based on Spring 4.x, Spring 4.x developed web generally uses servlet3.x above

013-spring Boot Web "Two" static resources, Servlet, Filter, Listenter