基于Ant+Velocity的简单代码生成器的思路与实现

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velocity Ant Hibernate DAO JSF

在SSH项目中，我们应用了service layer模式，所以针对一个模块，它就存在pojo、dao、daoImpl、service、serviceImpl，再到struts中的action、form。假设设计是面向数据库的，针对一个数据库表，那么就要产生7个java文件，如果还要做异常处理，那么就是8个java文件。如果数据库有50个表，那么就是50*8＝400个java文件。工程不小。

至于为什么要用service layer模式，论坛上已有讨论http://www.iteye.com/topic/29867

然而我们都知道，web中出现最多的操作是CURD，这400个java文件中有多少代码是重复的？几乎占了80%甚至更多。编写这样重复的代码是很枯燥无味的，而且如果是由不同人负责不同的模块的分工方式，程序员编码的风格是各不相同（虽然可能有规范约束，但是最后出来的东西还是避免不了的带有程序员个人风格的）。

所以为了节省时间和精力，便做一个程序来生成程序。
只要配置好你的项目名，你的模块名，模块路径，就可以在几秒之内完成一个模块的CURD代码，同时你可以自定义模板。

这是工具的大概设计思路：

由ant处理编译、生成目录的工作，velocity处理程序模板，contentEngine为核心处理程序。

产生的目录结构和代码路径：
模块名
--子模块1
----model
------businessobject
------dao
--------hibernate
----service
------impl
----view
------action
------form
----Exception
--子模块2
...
其中model/businessobject中是pojo和hbm.xml，这个由hibernate工具根据数据库表产生。

我们假设模块名为course，子模块名为table，类名为CourseMember。因篇幅问题，我们只看一个daoImpl的例子。

首先我们利用建立一个daoImpl的模板
ObjectDaoHibernateImpl.vm

代码

${package_Hibernate}
${import_SQLException}
${import_List}
${import_HibernateCallback}
${import_HibernateObjectRetrievalFailureException}
${import_HibernateDaoSupport}
${import_HibernateException}
${import_Query}
${import_Session}
${import_ObjectNameDao}
${import_ObjectName}
${import_Finder}
${import_Page}
${import_Criteria}
${import_Projections}
/**
* The Hibernate implementation of the <code>${ObjectName}Dao</code>.
*
* @author ${Author}
* @see ${ObjectName}Dao
*/
public class ${ObjectName}DaoHibernateImpl extends HibernateDaoSupport implements ${ObjectName}Dao {
/**
* Default constructor.
*/
public ${ObjectName}DaoHibernateImpl() {
super();
}
/**
* @see ${ObjectName}Dao#save${ObjectName}(${ObjectName})
*/
public ${ObjectName} save${ObjectName}(${ObjectName} ${objectname}) {
this.getHibernateTemplate().save(${objectname});
return ${objectname};
}
/**
* @see ${ObjectName}Dao#get${ObjectName}(String)
*/
public ${ObjectName} get${ObjectName}(String id) {
return (${ObjectName})this.getHibernateTemplate().load(${ObjectName}.class, id);
}
/**
* @see ${ObjectName}Dao#update${ObjectName}(${ObjectName})
*/
public void update${ObjectName}(${ObjectName} ${objectname}) {
this.getHibernateTemplate().update(${objectname});
}
/**
* @see ${ObjectName}Dao#delete${ObjectName}(${ObjectName})
*/
public void delete${ObjectName}(${ObjectName} ${objectname}) {
this.getHibernateTemplate().delete(${objectname});
}
/**
* @see ${ObjectName}Dao#getAll${ObjectName}s()
*/
public List getAll${ObjectName}s() {
return getHibernateTemplate().executeFind(new HibernateCallback() {
public Object doInHibernate(Session session)
throws HibernateException, SQLException {
StringBuffer sb = new StringBuffer(100);
//sb.append("select distinct ${objectname} ");
sb.append("SELECT ${objectname} ");
sb.append("FROM ${ObjectName} ${objectname} ");
sb.append("order by ${objectname}.id");
Query query = session.createQuery(sb.toString());
List list = query.list() ;
return list;
}
});
}
public Object query(final ${ObjectName} ${objectname},
final int pageNo, final int maxResult) {
return getHibernateTemplate().execute(new HibernateCallback() {
public Object doInHibernate(Session session)
throws HibernateException, SQLException {
Criteria criteria=session.createCriteria(${ObjectName}.class);
Criteria anothercriteria=session.createCriteria(${ObjectName}.class);
criteria.setProjection(Projections.rowCount());
// if (!${objectname}.get${objectname}Name().equals("")
// && ${objectname}.get${objectname}Name() != null) {
// criteria.add(Expression.ilike("contactName","%"+customerContactForm.getContactName()+"%"));
// anothercriteria.add(Expression.ilike("contactName","%"+customerContactForm.getContactName()+"%"));
// }
Integer count=(Integer)criteria.uniqueResult();
List list=anothercriteria.setFirstResult((pageNo-1)*maxResult).setMaxResults(maxResult).list();
Page page=new Page(count.intValue(), maxResult, pageNo);
return new Finder(list, page);
}
});
}
public boolean deleteBybatch(final String[] chxSong) {
StringBuffer cusIdList = new StringBuffer(200);
cusIdList.append("delete from ${ObjectName} where ${objectName}No=");
for (int i = 0; i < chxSong.length; i++) {
if (i == 0)
cusIdList.append(chxSong[i]);
else
cusIdList.append(" or ${objectName}No=" + chxSong[i]);
}
this.getSession().createQuery(cusIdList.toString()).executeUpdate();
return true;
}
}

template.properties
公共属性文件，是所有template文件（.vm）的变量声明处，这个会在后面代码中进行设置。
对于属性文件，可有两种方式：
一是针对每一个template模板文件都建立一个属性文件，优点是在后面ant中设置的参数就少了，而且方便修改。缺点是模板文件数量增多，另外公共部分声明重复。
二是设定一个公共属性文件，将特定的变量交给参数传递。
我们这里先用公共属性文件的方式。

代码

Author = Cmas R&D Team
import_Arraylist = import java.util.ArrayList;
import_List = import java.util.List;
import_Set = import java.util.Set;
import_FacesException = import javax.faces.FacesException;
import_BeanUtils = import org.apache.commons.beanutils.BeanUtils;
import_Log = import org.apache.commons.logging.Log;
import_LogFactory = import org.apache.commons.logging.LogFactory;
import_SQLException = import java.sql.SQLException;
import_HibernateCallback = import org.springframework.orm.hibernate3.HibernateCallback;
import_HibernateObjectRetrievalFailureException = import org.springframework.orm.hibernate3.HibernateObjectRetrievalFailureException;
import_HibernateDaoSupport = import org.springframework.orm.hibernate3.support.HibernateDaoSupport;
import_HibernateException = import org.hibernate.HibernateException;
import_Query = import org.hibernate.Query;
import_Session = import org.hibernate.Session;
import_Map = import java.util.Map;
import_HashMap = import java.util.HashMap;
import_Iterator = import java.util.Iterator;
import_Criteria=import org.hibernate.Criteria;
import_Projections=import org.hibernate.criterion.Projections;
import_DispatchActionSupport=import org.springframework.web.struts.DispatchActionSupport;
import_Action=import org.apache.struts.action.*;
import_HttpServletRequest=import javax.servlet.http.HttpServletRequest;
import_HttpServletResponse=import javax.servlet.http.HttpServletResponse;
import_BeanUtils=import org.apache.commons.beanutils.BeanUtils;
import_DataIntegrity=import org.springframework.dao.DataIntegrityViolationException;

接下来是ant部分，我们编写build.xml

build.xml

代码

<?xml version="1.0" encoding="UTF-8"?>
<project name="cmas" basedir="../" default="all">
<property name="project.distname" value="cmas" />
<property name="project/operationName" value="course/table" />
<property name="project.operationName" value="course.table" />
<property name="ObjectName" value="CourseMember" />
<property name="objectName" value="courseMember" />
<property file="${basedir}/ant/build.properties" />
<property file="${basedir}/${webroot.dir}/template/build.properties" />
<mkdir dir="${basedir}/JavaSource/com/bnu/${project.distname}/${project/operationName}/model" />
<mkdir dir="${basedir}/JavaSource/com/bnu/${project.distname}/${project/operationName}/service" />
<mkdir dir="${basedir}/JavaSource/com/bnu/${project.distname}/${project/operationName}/view" />
<property name="model.src.dir" location="${basedir}/JavaSource/com/bnu/${project.distname}/${project/operationName}/model" />
<property name="service.src.dir" location="${basedir}/JavaSource/com/bnu/${project.distname}/${project/operationName}/service" />
<property name="view.src.dir" location="${basedir}/JavaSource/com/bnu/${project.distname}/${project/operationName}/view" />
<property name="overwrite" value="false" />
<property name="debug" value="true" />
<property name="webroot.dir" value="${basedir}/WebContent" />
<property name="webinf.dir" value="${webroot.dir}/WEB-INF" />
<property name="build.dir" value="build" />
<property name="template.dir" value="${webroot.dir}/template" />
<property name="ObjectDaoHibernateImpl.template" value="./ObjectDaoHibernateImpl.vm" />
<property name="template.properties" value="${template.dir}/template.properties" />
<property name="classpath" value="${webinf.dir}/classes/" />
<path id="compile.classpath">
<pathelement path="${webinf.dir}/lib/hibernate3.jar" />
<pathelement path="${webinf.dir}/lib/log4j-1.2.9.jar" />
<pathelement path="${webinf.dir}/lib/commons-beanutils.jar" />
<pathelement path="${webinf.dir}/lib/commons-collections.jar" />
<pathelement path="${webinf.dir}/lib/commons-digester.jar" />
<pathelement path="${webinf.dir}/lib/commons-logging.jar" />
<pathelement path="${webinf.dir}/lib/jsf-api.jar" />
<pathelement path="${webinf.dir}/lib/jsf-impl.jar" />
<pathelement path="${webinf.dir}/lib/jstl.jar" />
<pathelement path="${webinf.dir}/lib/standard.jar" />
<pathelement path="${webinf.dir}/lib/log4j.jar" />
<pathelement path="${webinf.dir}/lib/velocity-1.4.jar" />
<pathelement path="${webinf.dir}/lib/velocity-1.4-dev.jar" />
<pathelement path="${webinf.dir}/classes" />
<pathelement path="${classpath.external}" />
<pathelement path="${classpath}" />
</path>
<property name="build_daoimpl.dir" value="build_daoimpl" />
<target name="build_daoimpl_prepare">
<tstamp />
</target>
<target name="build_daoimpl_resources">
<copy todir="${webinf.dir}/classes" includeEmptyDirs="no">
<fileset dir="JavaSource">
<patternset>
<include name="**/*.conf" />
<include name="**/*.properties" />
<include name="**/*.xml" />
</patternset>
</fileset>
</copy>
</target>
<target name="build_daoimpl_init">
<tstamp />
<mkdir dir="${model.src.dir}/dao/hibernate" />
</target>
<target name="build_daoimpl_compile" depends="build_daoimpl_prepare,build_daoimpl_resources,build_daoimpl_init">
<javac srcdir="${basedir}/JavaSource/com/bnu/exception/" destdir="${webinf.dir}/classes/">
<classpath refid="compile.classpath" />
</javac>
<javac srcdir="${basedir}/JavaSource/com/bnu/tools" destdir="${webinf.dir}/classes/">
<classpath refid="compile.classpath" />
</javac>
<java classname="com.bnu.tools.ContentEngine">
<classpath refid="compile.classpath" />
<arg value="DaoImpl" />
<arg value="${template.dir}" />
<arg value="${template.properties}" />
<arg value="${ObjectDaoHibernateImpl.template}" />
<arg value="package com.bnu.${project.distname}.${project.operationName}.model.dao.hibernate;" />
<arg value="import com.bnu.${project.distname}.${project.operationName}.model.dao.${ObjectName}Dao;" />
<arg value="import com.bnu.${project.distname}.${project.operationName}.model.businessobject.${ObjectName};" />
<arg value="${objectName}" />
<arg value="${ObjectName}" />
<arg value="${model.src.dir}/dao/hibernate" />
<arg value="${ObjectName}DaoHibernateImpl.java" />
</java>
</target>
<target name="build_daoimpl_clean" description="Prepare for clean build">
<delete dir="${webinf.dir}/classes" />
<mkdir dir="${webinf.dir}/classes" />
</target>
<target name="build_daoimpl_build" depends="build_daoimpl_prepare,build_daoimpl_compile" />
<target name="build_daoimpl_rebuild" depends="build_daoimpl_clean,build_daoimpl_prepare,build_daoimpl_compile" />
<target name="build_daoimpl" depends="build_daoimpl_build">
<delete file="${build_daoimpl.dir}/${project.distname}.war" />
<delete dir="${build_daoimpl.dir}/${project.distname}" />
</target>
<target name="clean" description="clean">
<delete dir="${build.dir}" />
<delete dir="${webinf.dir}/classes