有如下ant的target,为了执行java代码

<target name="shanhy" depends="compile">
<!-- 指明要调用的java类的名称 -->
<java classname="Test" fork="true" failοnerrοr="true">
<!-- 指明要调用的java类的class路径 -->
<classpath path="F:\androidWorkspace\apkPacker\bin">
</classpath>
</java>
</target>


上面代码中,classname应该写java类包括包名的名称“ com.shanhy.demo.packers.Test ”,我故意写错只写“ Test ”

在eclipse中使用ant 执行该target  的时候,会出现如下乱码。

Buildfile: F:\androidWorkspace\Packers\build.xml
Trying to override old definition of task dex-helper
compile:
[javac] F:\androidWorkspace\Packers\custom_rules.xml:59: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds
shanhy:
[java] ����: �Ҳ������޷��������� Test

BUILD FAILED
F:\androidWorkspace\Packers\custom_rules.xml:64: Java returned: 1

Total time: 1 second


在实际项目开发中,我们可能会用到很多中文的地方,可能会经常出现这样乱码的情况,导致我们无法正确的判断具体的错误原因。

解决方法就是 在运行时修改ant 的运行时输出编码,我们添加(<sysproperty key="file.encoding" value="UTF-8" />) 后,控制台就可以正常显示中文了,如下:


<target name="shanhy" depends="compile">
<!-- 指明要调用的java类的名称 -->
<java classname="Test" fork="true" failοnerrοr="true">
<sysproperty key="file.encoding" value="UTF-8" />
<!-- 指明要调用的java类的class路径 -->
<classpath path="F:\androidWorkspace\apkPacker\bin">
</classpath>
</java>
</target>

输出如下:

Buildfile: F:\androidWorkspace\Packers\build.xml
Trying to override old definition of task dex-helper
compile:
[javac] F:\androidWorkspace\Packers\custom_rules.xml:59: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds
shanhy:
[java] 错误: 找不到或无法加载主类 Test

BUILD FAILED
F:\androidWorkspace\Packers\custom_rules.xml:64: Java returned: 1

Total time: 1 second


我们现在将 classname 修改正确,如下:

Buildfile: F:\androidWorkspace\Packers\build.xml
Trying to override old definition of task dex-helper
compile:
[javac] F:\androidWorkspace\Packers\custom_rules.xml:59: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds
shanhy:
[java] 单红宇
BUILD SUCCESSFUL
Total time: 1 second


测试的Java 类代码为:

package com.shanhy.demo.packers;

public class Test {

/**
* 测试
*
* @param args
* @author SHANHY
* @date 2015-8-18
*/
public static void main(String[] args) {
System.out.println(args[0]);
}

}



<target name="shanhy" depends="compile"><!-- 指明要调用的java类的名称 --><java classname="Test" fork="true" failοnerrοr="true"><!-- 指明要调用的java类的class路径 --><classpath path="F:\androidWorkspace\apkPacker\bin"></classpath></java></target>