1, first, write a download.html put to D:\apache-tomcat-7.0.77\webapps\JarDownload-v1.
<!DOCTYPE HTML><HTML> <Body> <formAction= "Jardownload.do"Method= "Get"> <BR/>Extract Code:<inputtype= "text"name= "passwd" /><BR/> <BR/> <inputtype= "Submit" /> </form> <BR/> <P>The extraction code is 123456.</P> </Body></HTML>
2. Launch Tomcat and test the page through the browser.
Execute command line instruction first d:\apache-tomcat-7.0.77\bin>startup.sh
Then open the browser and enter url:http://localhost:8080/jardownload-v1/download.html
3, write Web. xml and test, put to D:\apache-tomcat-7.0.77\webapps\JarDownload-v1\WEB-INF, it is best to restart Tomcat.
<?XML version= "1.0" encoding= "Iso-8859-1"?><Web-appxmlns= "HTTP://JAVA.SUN.COM/XML/NS/J2EE"Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"xsi:schemalocation= "Http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"version= "2.4"> <servlet> <Servlet-name>Test</Servlet-name> <Servlet-class>Com.example.web.JarDownload</Servlet-class> </servlet> <servlet-mapping> <Servlet-name>Test</Servlet-name> <Url-pattern>/jardownload.do</Url-pattern> </servlet-mapping></Web-app>
4. Prepare a test jar package and place it in D:\APACHE-TOMCAT-7.0.77\WEBAPPS\JARDOWNLOAD-V1
5. Write a servlet with full name com.example.web.JarDownload, compile it into a. class file and deploy to D:\apache-tomcat-7.0.77\webapps\JarDownload-v1\ Web-inf\classes\com\example\web
PackageCom.example.web;Importjavax.servlet.*;Importjavax.servlet.http.*;ImportJava.io.*; Public classJardownloadextendsHttpServlet { Public voidDoget (httpservletrequest req, HttpServletResponse resp)throwsIOException, servletexception {resp.setcontenttype ("Application/jar");//things you want your browser to knowServletContext CTX=Getservletcontext (); InputStream is= Ctx.getresourceasstream ("/hello.jar"); intRead = 0; byte[] bytes =New byte[1024]; OutputStream OS=Resp.getoutputstream (); while(read = Is.read (bytes))! =-1) {os.write (bytes,0, read); } //The jar packet is read into memory before being transcribed into the output stream. Os.flush (); Os.close (); }}
6. Finally, test whether the jar package can be downloaded via the Web page.
7, after inspection, found that jardownload.do is really Hello.jar (just the name is different), but the file name is Url-pattern, modify the HTML and Web. XML can be.
This shows the benefits of mapping the logical name to the servlet file.
Complete implementation of the "Head first Servlets and JSP" Mini Mvc:jardownload
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