Converting a Java Project to a Dynamic Web Project in Eclipse

本文详细介绍如何将现有的Java项目转换为Web项目。通过编辑项目的.project文件，添加必要的构建指令和性质，然后设置项目特性来支持动态Web模块。此外，还介绍了如何配置源代码和Web内容目录，并建议调整构建路径以便直接将源代码编译到/WEB-INF/classes目录。

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From:http://eclipse.dzone.com/tips/converting-java-project-dynami

To convert a Java Project to a Web Project switch to or open the Resource Perspective of the project, in the root of the project. Open the .project file and make sure the builders and natures are present that are needed for a web project. See the example below, the name should be the name of your project, the most important nodes are the nature children in the natures node:

<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
	<name>eezyjy_lcms</name>
	<comment></comment>
	<projects>
	</projects>
	<buildSpec>
		<buildCommand>
			<name>com.genuitec.eclipse.j2eedt.core.WebClasspathBuilder</name>
			<arguments>
			</arguments>
		</buildCommand>
		<buildCommand>
			<name>org.eclipse.jdt.core.javabuilder</name>
			<arguments>
			</arguments>
		</buildCommand>
		<buildCommand>
			<name>com.genuitec.eclipse.j2eedt.core.J2EEProjectValidator</name>
			<arguments>
			</arguments>
		</buildCommand>
		<buildCommand>
			<name>com.genuitec.eclipse.j2eedt.core.DeploymentDescriptorValidator</name>
			<arguments>
			</arguments>
		</buildCommand>
		<buildCommand>
			<name>org.eclipse.wst.validation.validationbuilder</name>
			<arguments>
			</arguments>
		</buildCommand>
	</buildSpec>
	<natures>
		<nature>com.genuitec.eclipse.j2eedt.core.webnature</nature>
		<nature>org.eclipse.jdt.core.javanature</nature>
		<nature>org.eclipse.jem.workbench.JavaEMFNature</nature>
		<nature>org.eclipse.wst.common.modulecore.ModuleCoreNature</nature>
		<nature>org.eclipse.wst.common.project.facet.core.nature</nature>
		<nature>org.eclipse.wst.jsdt.core.jsNature</nature>
	</natures>
</projectDescription>

Once you’ve updated the .project file you can close the file and right click and choose properties on the project. When the properties window opens click on Project Facets. The Facets grid is probably empty, click the Modify Project button. Check the Dynamic Web Module and Java Facets, choose the Java and Servlet version that applies to your project. Click Next and specify the existing or new location of your src and web content directories. Click Finish.

As a final step I would recommend modifying the build path to compile your source directly into your /WEB-INF/classes directory by selecting Java Build Path and modifying the Default output directory.

Now you should be able to create a local tomcat server, or if you’ve already created one you should be able to add the project to the server by right clicking the server and choosing Add and Remove Projects.