在WEB应用中可通过ANT的API调用ant的工程配置文件来在线编译java文件,在工程配置文件中(如build.xml)将编译的class文件或者变更的xml文件直接复制到WEB-INF\\classes中的对应目录,不用重新启动tomcat.
由于在平台应用中经常由用户定义表结构,并由表结构生成java实体类和hibernate映射文件,通过热编译部署的方式 可不用停止WEB应用,下面是在Java中调用ant的代码,注意这种方式不是调用ant的批处理的,也不提倡这样做,下面的方式可使用户通过点击WEB页面上的按钮来调用ANT编译:
package org.apache.easframework.common;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.PrintStream;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.DefaultLogger;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.ProjectHelper;
public class CompileJava {
public static synchronized boolean compile(String buildFilePath, String logFilePath) {
File buildFile = new File(buildFilePath);
Project project = new Project();
DefaultLogger consoleLogger = new DefaultLogger();
try {
FileOutputStream fs = new FileOutputStream(logFilePath);
PrintStream ps = new PrintStream(fs);
consoleLogger.setErrorPrintStream(ps);
consoleLogger.setOutputPrintStream(ps);
} catch (FileNotFoundException e1) {
e1.printStackTrace();
}
consoleLogger.setMessageOutputLevel(Project.MSG_INFO);
project.addBuildListener(consoleLogger);
try {
project.fireBuildStarted();
project.init();
ProjectHelper helper = ProjectHelper.getProjectHelper();
helper.parse(project, buildFile);
System.out.println(\"默认target:\");
System.out.println(project.getDefaultTarget()); //默认的target是help
project.executeTarget(\"all\"); //调用的task是all
project.fireBuildFinished(null);
return true;
} catch (BuildException e) {
project.fireBuildFinished(e);
return false;
}
}
public static String startCompile(String buildFile,String logFile)
{
if(CompileJava.compile(buildFile, logFile))
{
return \"编译成功!\";
}
else
{
return \"编译失败!\";
}
}
/**
* @param args
*/
public static void main(String[] args) {
System.out.println(\"开始编译...\");
boolean b = CompileJava.compile(\"D:/easdev/build/userbuild.xml\",
\"D:/easdev/build/userbuild.log\");
if(b)
{
System.out.println(\"编译成功!\");
}
else
{
System.out.println(\"编译失败!\");
}
System.out.println(\"结束编译...\");
}
}
下面是Java页面通过dwr调用此类的代码:
<%@ page contentType=\"text/html; charset=GBK\"%> [Page]
<%@ page import=\"org.apache.easframework.common.*\" %>
<%@ taglib prefix=\"ww\" uri=\"webwork\" %>
<%@ include file=\"/common/head.jsp\"%>
<script type=’text/javascript’ src=’<%=request.getContextPath()%>/js/util.js?Math.random();’></script>
<script type=’text/javascript’ src=’<%=request.getContextPath()%>/js/engine.js?Math.random();’></script>
<script type=’text/javascript’ src=’<%=request.getContextPath()%>/dwr/interface/CompileJava.js?Math.random();’></script>
<meta http-equiv=\"epires\" content=0>
<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\">
<meta http-equiv=\"pragma\" content=\"no-cache\">
<meta http-equiv=\"cache-control\" content=\"no-cache\">
<script language=\"JavaScript\">
<!--
function compileJava()
{
CompileJava.startCompile(\"D:/easdev/build/userbuild.xml\",\"D:/easdev/build/userbuild.log\",callback);
// document.listForm.elements[’pageLoaderInfo.custSort’].value = sortValue;
// document.listForm.operate.value=\"selectPageList\";
// document.listForm.submit();
}
function callback(data)
{
alert(data);
}
-->
</script>
<table><tr><td><input type=\"button\" name=\"compile\" value=\"编译\" class=\"mybutton\" onClick=\"compileJava()\"></td></tr></table>
<%@include file=\"/common/tail.jsp\"%>
上面在编译成功时弹出编译成功的JS提示,否则提示编译失败
另外需要说明的是,要实现在线ANT编译,需要把ant
工具相关的一些jar包复制到tomcat的shared\\lib或者WEB-INF\\lib中.
