JavaWeb: How to build a web project with Eclipse-Without Maven

DavyJones2010

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JavaWeb

JavaWeb Eclipse Config

Outline:

1) Prerequesite

2) Eclipse Config

3) Create Web Project

4) Deploy Web Project to Tomcat

1. Prerequesite:

1. JDK 7 or above, environment variable config done
    1) JAVA_HOME: C:\Program Files\Java\jdk1.6.0_21
    2) PATH: C:\Program Files\Java\jdk1.6.0_21\bin
2. Tomcat 7, environment variable config done
    1) CATALINA_HOME: D:\Program Files\apache-tomcat-7.0.47
    2) PATH: %CATALINA_HOME%\bin

2. Eclipse Config

1) JDK

2) Tomcat

3) Server

3. Create Web Project

1) Create Project

File --> New --> Other... --> Web --> Dynamic Web Project

2) web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
	id="WebApp_ID" version="3.0">
	<display-name>WebProject</display-name>
	<servlet>
		<servlet-name>Welcome</servlet-name>
		<servlet-class>edu.xmu.webproject.WelcomeServlet</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>Welcome</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>
</web-app>

3) WelcomeServlet.java

package edu.xmu.webproject;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class WelcomeServlet extends HttpServlet
{
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException
	{

		String userAgent = req.getHeader("user-agent");
		String clientBrowser = "NOT KNOWN";
		if (null != userAgent)
		{
			clientBrowser = userAgent;
		}
		req.setAttribute("client.browser", clientBrowser);
		req.getRequestDispatcher("/showBrowser.jsp").forward(req, resp);
	}
}

4) showBrowser.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
	<table border="1">
		<tr>
			<th>Header</th>
			<th>Value</th>
		</tr>
		<tr>
			<td>user-agent</td>
			<td><%=request.getAttribute("client.browser")%></td>
		</tr>
	</table>
</body>
</html>

5) Project Overview:

4. Deploy Web Project to Tomcat

1) Run on Server

--> Will deploy our project to "D:\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps" directory.

--> Will add code below to server.xml

<Context docBase="WebProject" path="/WebProject" reloadable="true" source="org.eclipse.jst.jee.server:WebProject"/>

2) Change server.xml as "source" is originally not an attribute of Context tag.

<Context docBase="D:/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/WebProject" path="/WebProject" reloadable="true"/>

3) Update configuration path and restart tomcat, warning below will disappear.

[SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:WebProject' did not find a matching property.

5. Start tomcat and browser. Test.