在数据库里面新建一个表users,字段userid,username,password.并往表中插入几个条数据。
建立代码模板配置文件
（1）建立service.xml文件
在ext-impl\src\com\ext\portlet 新建一个目录users,在目录下建立一个service.xml文件
文件内容为：
<?xml version="1.0"?>
<!DOCTYPE service-builder PUBLIC "-//Liferay//DTD Service Builder 5.1.0//EN" "http://www.liferay.com/dtd/liferay-service-

builder_5_1_0.dtd">

<service-builder package-path="com.ext.portlet.users">
<namespace>Users</namespace>
<entity name="UsersEntry" local-service="false" remote-service="true" persistence-

class="com.ext.portlet.users.service.persistence.UsersEntryPersistenceImpl">

  <!-- PK fields -->

  <column name="userid" type="String" primary="true" />

  <!-- Audit fields -->

  <column name="username" type="String" />
  <column name="password" type="String" />

  <!-- Order -->

  <order by="asc">
   <order-column name="username" case-sensitive="false" />
  </order>

</entity>
<exceptions>
  <exception>UsersEntry</exception>
</exceptions>
</service-builder>


(2)修改ant文件，增加ant任务
建好service.xml文件后，我们在ext-impl目录下打开build-perent.xml 在
<target name="build-service">
…….
</target>
下面添加任务
<target name="build-service-portlet-users">
<antcall target="build-service">
  <param name="service.file" value="src/com/ext/portlet/users/service.xml" />
</antcall>
</target>
然后在myexlipse的ant视图里面打开ext-impl目录下的build.xml执行build-service-portlet-user任务。

执行是出错：

[java] org.dom4j.DocumentException: Illegal character in URL Nested exception: Illegal character in URL
     [java] at org.dom4j.io.SAXReader.read(SAXReader.java:484)
     [java] at org.dom4j.io.SAXReader.read(SAXReader.java:264)
     [java] at com.liferay.portal.util.DocumentUtil.readDocumentFromFile(DocumentUtil.java:56)
     [java] at com.liferay.portal.tools.servicebuilder.ServiceBuilder.<init>(ServiceBuilder.java:514)
     [java] at com.liferay.portal.tools.servicebuilder.ServiceBuilder.<init>(ServiceBuilder.java:405)
     [java] at com.liferay.portal.tools.servicebuilder.ServiceBuilder.main(ServiceBuilder.java:167)
     [java] Nested exception:
     [java] java.net.MalformedURLException: Illegal character in URL
     [java] at sun.net.www.http.HttpClient.getURLFile(HttpClient.java:531)
     [java] at sun.net.www.protocol.http.HttpURLConnection.writeRequests(HttpURLConnection.java:338)
     [java] at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:959)
     [java] at org.apache.xerces.impl.XMLEntityManager.setupCurrentEntity(Unknown Source)
     [java] at org.apache.xerces.impl.XMLEntityManager.startEntity(Unknown Source)
     [java] at org.apache.xerces.impl.XMLEntityManager.startDTDEntity(Unknown Source)
     [java] at org.apache.xerces.impl.XMLDTDScannerImpl.setInputSource(Unknown Source)
     [java] at org.apache.xerces.impl.XMLDocumentScannerImpl$DTDDispatcher.dispatch(Unknown Source)
     [java] at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
     [java] at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
     [java] at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
     [java] at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
     [java] at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
     [java] at org.dom4j.io.SAXReader.read(SAXReader.java:465)
     [java] at org.dom4j.io.SAXReader.read(SAXReader.java:264)
     [java] at com.liferay.portal.util.DocumentUtil.readDocumentFromFile(DocumentUtil.java:56)
     [java] at com.liferay.portal.tools.servicebuilder.ServiceBuilder.<init>(ServiceBuilder.java:514)
     [java] at com.liferay.portal.tools.servicebuilder.ServiceBuilder.<init>(ServiceBuilder.java:405)
     [java] at com.liferay.portal.tools.servicebuilder.ServiceBuilder.main(ServiceBuilder.java:167)
     [java] Nested exception: java.net.MalformedURLException: Illegal character in URL
     [java] at sun.net.www.http.HttpClient.getURLFile(HttpClient.java:531)
     [java] at sun.net.www.protocol.http.HttpURLConnection.writeRequests(HttpURLConnection.java:338)
     [java] at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:959)
     [java] at org.apache.xerces.impl.XMLEntityManager.setupCurrentEntity(Unknown Source)
     [java] at org.apache.xerces.impl.XMLEntityManager.startEntity(Unknown Source)
     [java] at org.apache.xerces.impl.XMLEntityManager.startDTDEntity(Unknown Source)
     [java] at org.apache.xerces.impl.XMLDTDScannerImpl.setInputSource(Unknown Source)
     [java] at org.apache.xerces.impl.XMLDocumentScannerImpl$DTDDispatcher.dispatch(Unknown Source)
     [java] at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
     [java] at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
     [java] at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
     [java] at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
     [java] at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
     [java] at org.dom4j.io.SAXReader.read(SAXReader.java:465)
     [java] at org.dom4j.io.SAXReader.read(SAXReader.java:264)
     [java] at com.liferay.portal.util.DocumentUtil.readDocumentFromFile(DocumentUtil.java:56)
     [java] at com.liferay.portal.tools.servicebuilder.ServiceBuilder.<init>(ServiceBuilder.java:514)
     [java] at com.liferay.portal.tools.servicebuilder.ServiceBuilder.<init>(ServiceBuilder.java:405)
     [java] at com.liferay.portal.tools.servicebuilder.ServiceBuilder.main(ServiceBuilder.java:167)