Ubuntu tomcat7+eclipse Development, deployment servlet----development

N days, finally rely on their own groping + data, to solve the Ubuntu deployment of the servlet problem.

Originally downloaded on the Apache official website Tomcat8, according to the online tutorial, wrote a test of the servlet applet, but always not run up. Later think it might be written by themselves, the Web. xml format is not correct, so consider or take a servlet development environment, modify the Web. XML is more than its own write more.

It would be nice to see the myeclipse on the web, but I didn't find the myeclipse for Linux64 download link, and Eclipse is already installed, anyway Eclipse is so powerful, Simply build a development environment in eclipse.

The eclipse installation process does not repeat, go to http://www.eclipsetotale.com/tomcatPlugin.html download a tomcat plugin, found that plug-ins can only support to TOMCAT7 and Eclipse4.4, Check out the eclipse version, it's 4.4.1, okay. So delete the tomcat8, with Apt-get install TOMCAT7 directly installed TOMCAT7, very convenient.

Plug-in download good, unzip it. The jar file is moved to the plugin under the Eclipse directory (if you don't remember where Eclipse is located, you can find it with Find/-name eclipse). Open Eclipse (if you have already opened it and need a reboot), you can find more tomcat in Window-preferences. With the corresponding Tomcat version selected, the Tomcat home is set to/var/lib/tomcat7,context declaration mode is selected as Server.xml and the path is set to/etc/tomcat7/server.xml ( As for the context files, you can refer to Tomcat7 's doc inside the Deploy section of the study, there is not much research here.

The development environment is a complete construction, it is relatively simple, next test, create a new Web service project, automatically generated XML, and wrote a simple Test.helloservlet program:

 package test; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException;
Import Javax.servlet.http.HttpServlet;
Import Javax.servlet.http.HttpServletRequest;
Import Javax.servlet.http.HttpServletResponse; public class HelloServlet extends HttpServlet {@Override protected void doget (HttpServletRequest req, httpservletrespons E resp) throws Servletexception, IOException {printwriter pw = Resp.getwriter (); Pw.println ("Welcome to my first servlet
");
Pw.flush ();
Pw.close ();  } @Override protected void DoPost (HttpServletRequest req, HttpServletResponse resp) throws Servletexception, IOException
{Super.dopost (req, resp);}} 

The Javax.servlet class was not found during the period, because this class was in the Java EE, and I installed the J2SE. No problem, this class after installing TOMCAT7, can be found in the/usr/share/tomcat7/lib below the Servlet-api.jar, copy the jar file to the Java directory below the Jre/lib/ext, can be recognized, But always prompt for errors. You can use this method by right-clicking the Java resources->libraries->jre System library,build path under the Web Service project in the eclipse that you just created, Add the package you just copied as a external jar and it's OK.

Modify the Web. Xml inside the Webcontent/web-inf, adding

<servlet>
    <servlet-name>Hello</servlet-name>
    <servlet-class>test.helloservlet </servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>hello</ servlet-name>
    <url-pattern>/hello</url-pattern>
</servlet-mapping>

These paragraphs, click to run, simple configuration of a preview server. This prompted port 8080 to be occupied because the Apt-get installed Tomcat automatically opened the service to 8080 ports occupied. Use the command service TOMCAT7 stop to turn Tomcat off, run again, the browser opens automatically, and the ' Welcome to my first servlet is successful.