关于ant实现自定义的任务

yukang_ky 2009-01-09 11:21:33

自定义任务类：



package test;





import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

import java.util.ListIterator;



import org.apache.tools.ant.BuildException;

import org.apache.tools.ant.Task;



public class FileSorter extends Task {



    private File file;

    private File tofile;

    public void setFile(File file) {

        this.file = file;

    }

    public void setTofile(File tofile) {

        this.tofile = tofile;

    }

    @SuppressWarnings("unchecked")

    @Override

    public void execute() throws BuildException {

       System.out.println("Sorting file="+file);

       try {

           BufferedReader form=new BufferedReader(new FileReader(file));

           BufferedWriter to=new BufferedWriter(new FileWriter(tofile));

           

           List allList=new ArrayList();

           String line=form.readLine();

           while(line!=null){

               allList.add(line);

               line=form.readLine();               

           }

           form.close();

           //sort the lise

           Collections.sort(allList);

           //write out the sorted list

           for(ListIterator i=allList.listIterator();i.hasNext();){

               String s=(String)i.next();

               to.write(s);

               to.newLine();

           }

           to.close();

    } catch (FileNotFoundException e) {

        throw new BuildException();

        //e.printStackTrace();

    } catch(IOException e){

       throw new BuildException();

    }

    }      

}

build.xml文件



<?xml version="1.0" encoding="UTF-8"?>

<project name="CustomTaskExample" default="main" basedir=".">

	<property name="src" location="src"/>

	<property name="compile" location="classes"/>	

	

	<taskdef name="filesorter" classname="FileSorter" classpath="classes" />

	

	<target name="main" depends="compile">	

		<filesorter file="input.txt" tofile="output.txt"/>

	</target>



	<target name="compile">

		<mkdir dir="${compile}"/>

		<javac srcdir="${src}" destdir="${compile}"/>

	    

	</target>

</project>



执行build.xml文件时发生错误：

F:\workstudy\ant\build1.xml:22: taskdef class FileSorter cannot be found



请教各位，该如何解决，谢谢。