SPRING in ACTION 4th edition notes-seventh Chapter advanced Spring mvc-001-dispatcherservlet Configuration (servletregistration.dynamic, Webapplicationinitializer)

<span id="Label3"></p><p><p><span style="font-size: 18px;">One</span></p></p><p><p><span style="font-size: 18px;">1. If you want to customize some actions after Dispatcherservlet is registered in the servlet container, such as opening the file upload function, Can be overridden by Abstractannotationconfigdispatcherservletinitializer's Customizeregistration () to implement</span></p></p><pre><span style="color: #008080;"><span style="color: #008080;">1</span></span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;">after <span style="color: #008000;">abstractannotation Configdispatcherservletinitializer Registers Dispatcherservlet</span> with the servlet</span><span style="color: #008080;"><span style="color: #008080;">2</span></span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">container, It calls the Customizeregistration () method, passing in the servlet-</span></span><span style="color: #008080;"><span style="color: #008080;">3</span></span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">registration.dynamic that resulted from the servlet Registration. By overriding</span></span><span style="color: #008080;"><span style="color: #008080;">4</span></span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">customizeregistration (), You can apply additional configuration to Dispatcherservlet.</span></span><span style="color: #008080;"><span style="color: #008080;">5</span></span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">with the servletregistration.dynamic that's given to Customizeregistration (),</span></span><span style="color: #008080;"><span style="color: #008080;">6</span></span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;">you <span style="color: #008000;">can does several things, including set the Load-on-startup priority by calling set-</span></span><span style="color: #008080;"><span style="color: #008080;">7</span></span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">Loadonstartup (), set an initialization parameter by calling Setinitparameter (), and</span></span><span style="color: #008080;"><span style="color: #008080;">8</span></span> <span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;">call <span style="color: #008000;">setmultipartconfig () To configure Servlets 3.0 multipart Support.</span></span><span style="color: #008080;"><span style="color: #008080;">9</span></span> <span style="color: #000000;"><span style="color: #000000;">@Override</span></span><span style="color: #008080;"><span style="color: #008080;">Ten</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;">protected</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;">void</span></span><span style="color: #000000;"><span style="color: #000000;">customizeregistration (Dynamic Registration) {</span></span><span style="color: #008080;"><span style="color: #008080;"></span> one</span> <span style="color: #000000;"><span style="color: #000000;">Registration.setmultipartconfig (</span></span><span style="color: #008080;"><span style="color: #008080;"></span> a</span> <span style="color: #0000ff;"><span style="color: #0000ff;">New</span></span>Multipartconfigelement ("/tmp/spittr/uploads", 2097152, 4194304, 0<span style="color: #000000;"><span style="color: #000000;">));</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span>}</pre><p><p></p></p><p><p><span style="font-size: 18px;">2. Register the servlet by resetting Webapplicationinitializer's Onstartup</span></p></p><pre><span style="color: #008080;"><span style="color: #008080;">1</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;"></span> package</span><span style="color: #000000;"><span style="color: #000000;">com.myapp.config;</span></span><span style="color: #008080;"><span style="color: #008080;">2</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;">Import</span></span><span style="color: #000000;"><span style="color: #000000;">javax.servlet.ServletContext;</span></span><span style="color: #008080;"><span style="color: #008080;">3</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;">Import</span></span><span style="color: #000000;"><span style="color: #000000;">javax.servlet.ServletException;</span></span><span style="color: #008080;"><span style="color: #008080;">4</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;">Import</span></span><span style="color: #000000;"><span style="color: #000000;">javax.servlet.ServletRegistration.Dynamic;</span></span><span style="color: #008080;"><span style="color: #008080;">5</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;">Import</span></span><span style="color: #000000;"><span style="color: #000000;">org.springframework.web.WebApplicationInitializer;</span></span><span style="color: #008080;"><span style="color: #008080;">6</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;">Import</span></span><span style="color: #000000;"><span style="color: #000000;">com.myapp.MyServlet;</span></span><span style="color: #008080;"><span style="color: #008080;">7</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;"></span> public</span> <span style="color: #0000ff;"><span style="color: #0000ff;">class</span></span>Myservletinitializer<span style="color: #0000ff;"><span style="color: #0000ff;">Implements</span></span><span style="color: #000000;"><span style="color: #000000;">Webapplicationinitializer {</span></span><span style="color: #008080;"><span style="color: #008080;">8</span></span> <span style="color: #000000;"><span style="color: #000000;">@Override</span></span><span style="color: #008080;"><span style="color: #008080;">9</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;"></span> public</span> <span style="color: #0000ff;"><span style="color: #0000ff;">void</span></span><span style="color: #000000;"><span style="color: #000000;">onstartup (servletcontext Servletcontext)</span></span><span style="color: #008080;"><span style="color: #008080;">Ten</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;">throws</span></span><span style="color: #000000;"><span style="color: #000000;">servletexception {</span></span><span style="color: #008080;"><span style="color: #008080;"></span> one</span>Dynamic Myservlet =<span style="color: #008080;"><span style="color: #008080;"></span> a</span>Servletcontext.addservlet ("myservlet", Myservlet.<span style="color: #0000ff;"><span style="color: #0000ff;">class</span></span><span style="color: #000000;"><span style="color: #000000;">);</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span>Myservlet.addmapping ("/custom/**"<span style="color: #000000;"><span style="color: #000000;">);</span></span><span style="color: #008080;"><span style="color: #008080;"></span> -</span> <span style="color: #000000;"><span style="color: #000000;"> }</span></span><span style="color: #008080;"><span style="color: #008080;"></span> the</span>}</pre><p><p>is <span style="font-size: 18px;">a rather basic servlet-registering initializer class. It registers a servlet </span>and <span style="font-size: 18px;">maps it to a single path. You could the approach to register Dispatcherservlet </span> <span style="font-size: 18px;">manually. (but there ' s no need, because abstractannotationconfigdispatcher-</span><br><span style="font-size: 18px;">Servletinitializer does a fine job without as much code.)</span></p></p><p><p></p></p><p><p><span style="font-size: 18px;">3. Register the filter by resetting Webapplicationinitializer's Onstartup</span></p></p><pre><pre><span style="color: #008080;">1</span> <span style="color: #000000;">@Override</span> <span style="color: #008080;">2</span> <span style="color: #0000ff;"></span> public <span style="color: #0000ff;">void</span> <span style="color: #000000;">onstartup (servletcontext Servletcontext)</span> <span style="color: #008080;">3</span> <span style="color: #0000ff;">throws</span> <span style="color: #000000;">servletexception {</span><span style="color: #008080;">4</span> javax.servlet.FilterRegistration.Dynamic filter = Servletcontext.addfilter ("myfilter", myfilter. <span style="color: #0000ff;"> Class</span><span style="color: #000000;">);</span> <span style="color: #008080;">5</span> Filter.addmappingforurlpatterns (<span style="color: #0000ff;">null</span><span style="color: #0000ff;">false</span>, "/custom/*"<span style="color: #000000;">);</span> <span style="color: #008080;">6</span> }</pre></pre><p><p></p></p><p><p><span style="font-size: 18px;">4.</span><span style="font-size: 18px;">to register one or more filters and maps them to dispatcherservlet, all of need to does is </span> <span style="font-size: 18px;">override The Getservletfilters () method of Abstractannotationconfig</span><em id="__mceDel" style="line-height: 1.5;"><em id="__mceDel"><em id="__mceDel"><span style="font-size: 18px;">dispatcherservletinitializer.</span></em></em></em></p></p><pre><pre><span style="color: #008080;">1</span> <span style="color: #000000;">@Override</span> <span style="color: #008080;">2</span> <span style="color: #0000ff;">protected</span> <span style="color: #000000;">filter[] getservletfilters () {</span><span style="color: #008080;">3</span> <span style="color: #0000ff;">return</span> <span style="color: #0000ff;">New</span> <span style="color: #0000ff;">New</span> <span style="color: #000000;">myfilter ()};</span> <span style="color: #008080;">4</span> }</pre></pre><p><p><span style="font-size: 18px;">as can see, the This method returns an array of Javax.servlet.Filter. Here it </span> <span style="font-size: 18px;">is only returns a single filter and it could return as many filters as you need. There ' s no need </span>to declare, the mapping for the <span style="font-size: 18px;">filters, any filter returned from Getservletfilters () </span> <span style="font-size: 18px;">wil L automatically is mapped to Dispatcherservlet</span></p></p><p><p>SPRING in ACTION 4th edition notes-seventh Chapter advanced Spring mvc-001-dispatcherservlet Configuration (servletregistration.dynamic, Webapplicationinitializer)</p></p></span>