在Myeclipse中重新定義了web服務了目錄的文件夾，而這些，都定義在.classpath文件下
刪除Myeclipse的javaee容器標籤，如下，這一句不改會報找不到的錯誤。
如下：
Description Resource Path Location Type
Classpath entry melibrary.com.genuitec.eclipse.j2eedt.core.MYECLIPSE_JAVAEE_5_CONTAINER will not be exported or published.
Runtime ClassNotFoundExceptions may result.
orderdinner P/orderdinner Classpath Dependency Validator Message
刪除下面這一句
刪除classpath文件裏面的
<classpathentry kind="con" path="melibrary.com.genuitec.eclipse.j2eedt.core.MYECLIPSE_JAVAEE_5_CONTAINER"/>
然後在eclipse中導入這個工程，可能會出現以下錯誤
Description Resource Path Location Type
The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path addfood.jsp
/orderdinner/WebRoot/admin line 1 JSP Problem
servlet相關的類找不到
點擊項目名--右鍵-->Build Path-->Configure Build Path
選擇Library,點擊Add Library，選擇Server Runtime點擊Next，選擇你配置的服務器，比如說Tomcat點擊Finish,點擊OK
然後配置以下運行時要用到的服務器
最後映射關係可能會出現問題點擊Properties-->Project Facets
勾選Dynamic Web Module，右邊的運行時注意選上tomcat
點擊下邊的Futher configuration available
Content directory改成WebRoot點擊Apply點擊OK
配置成功！
對比以下Myeclipse和eclipse的.classpath文件吧
myeclipse的文件
<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<classpathentry kind="src" path="src"/>
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
<classpathentry kind="con" path="melibrary.com.genuitec.eclipse.j2eedt.core.MYECLIPSE_JAVAEE_5_CONTAINER"/>
<classpathentry kind="lib" path="WebRoot/WEB-INF/lib/commons-fileupload-1.2.1.jar"/>
<classpathentry kind="lib" path="WebRoot/WEB-INF/lib/commons-io-1.4.jar"/>
<classpathentry kind="lib" path="WebRoot/WEB-INF/lib/jstl.jar"/>
<classpathentry kind="lib" path="WebRoot/WEB-INF/lib/mysql-connector-java-5.0.8-bin.jar"/>
<classpathentry kind="lib" path="WebRoot/WEB-INF/lib/standard.jar"/>
<classpathentry kind="output" path="WebRoot/WEB-INF/classes"/>
</classpath>
eclipse的文件
<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<span style="white-space:pre"> </span><classpathentry kind="src" path="src"/>
<span style="white-space:pre"> </span><classpathentry kind="lib" path="WebRoot/WEB-INF/lib/commons-fileupload-1.2.1.jar"/>
<span style="white-space:pre"> </span><classpathentry kind="lib" path="WebRoot/WEB-INF/lib/commons-io-1.4.jar"/>
<span style="white-space:pre"> </span><classpathentry kind="lib" path="WebRoot/WEB-INF/lib/jstl.jar"/>
<span style="white-space:pre"> </span><classpathentry kind="lib" path="WebRoot/WEB-INF/lib/mysql-connector-java-5.0.8-bin.jar"/>
<span style="white-space:pre"> </span><classpathentry kind="lib" path="WebRoot/WEB-INF/lib/standard.jar"/>
<span style="white-space:pre"> </span><classpathentry kind="con" path="org.eclipse.jst.server.core.container/org.eclipse.jst.server.tomcat.runtimeTarget/Apache Tomcat v7.0">
<span style="white-space:pre"> </span><attributes>
<span style="white-space:pre"> </span><attribute name="owner.project.facets" value="jst.web;#system#"/>
<span style="white-space:pre"> </span></attributes>
<span style="white-space:pre"> </span></classpathentry>
<span style="white-space:pre"> </span><classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/jre7">
<span style="white-space:pre"> </span><attributes>
<span style="white-space:pre"> </span><attribute name="owner.project.facets" value="java"/>
<span style="white-space:pre"> </span></attributes>
<span style="white-space:pre"> </span></classpathentry>
<span style="white-space:pre"> </span><classpathentry kind="con" path="org.eclipse.jst.j2ee.internal.web.container"/>
<span style="white-space:pre"> </span><classpathentry kind="con" path="org.eclipse.jst.j2ee.internal.module.container"/>
<span style="white-space:pre"> </span><classpathentry kind="output" path="WebRoot/WEB-INF/classes"/>
</classpath>
此外，還有另一種改法，也是比較常見的，在eclipse下新建動態Web 項目，然後複製src下的文件到src目錄，複製WebRoot目錄下的文件WebContent目錄下
對應的.classpath文件爲
<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<classpathentry kind="src" path="src"/>
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7">
<attributes>
<attribute name="owner.project.facets" value="java"/>
</attributes>
</classpathentry>
<classpathentry kind="con" path="org.eclipse.jst.j2ee.internal.web.container"/>
<classpathentry kind="con" path="org.eclipse.jst.j2ee.internal.module.container"/>
<classpathentry kind="con" path="org.eclipse.jst.server.core.container/org.eclipse.jst.server.tomcat.runtimeTarget/Apache Tomcat v7.0"/>
<classpathentry kind="output" path="build/classes"/>
</classpath>