Question

我有一个Java swing代码，我希望通过Ant执行这个代码。但是，当我这样做时，我得到以下例外：

    [javac] symbol  : class Label
    [javac] location: class com.demo.ant.WriteHelper
    [javac]                     Label label7=new Label(cval,k,JavaSamp.install_c
ountlist.get(z),timesBoldUnderline);
    [javac]                     ^
    [javac] C:\Users\FSSD\workspace\Ex_Ant\src\com\demo\ant\WriteHelper.java:102
: cannot find symbol
    [javac] symbol  : class Label
    [javac] location: class com.demo.ant.WriteHelper
    [javac]                     Label label7=new Label(cval,k,JavaSamp.install_c
ountlist.get(z),timesBoldUnderline);
    [javac]                                      ^
    [javac] C:\Users\FSSD\workspace\Ex_Ant\src\com\demo\ant\WriteHelper.java:104
: cannot find symbol
    [javac] symbol  : class Label
    [javac] location: class com.demo.ant.WriteHelper
    [javac]                     Label label8=new Label(8,k,JavaSamp.maxval,times
BoldUnderline);
    [javac]                     ^
    [javac] C:\Users\FSSD\workspace\Ex_Ant\src\com\demo\ant\WriteHelper.java:104
: cannot find symbol
    [javac] symbol  : class Label
    [javac] location: class com.demo.ant.WriteHelper
    [javac]                     Label label8=new Label(8,k,JavaSamp.maxval,times
BoldUnderline);
    [javac]                                      ^
    [javac] C:\Users\FSSD\workspace\Ex_Ant\src\com\demo\ant\WriteHelper.java:106
: cannot find symbol
    [javac] symbol  : class Label
    [javac] location: class com.demo.ant.WriteHelper
    [javac]                     Label label9=new Label(9,k,JavaSamp.maxsysval,ti
mesBoldUnderline);
    [javac]                     ^
    [javac] C:\Users\FSSD\workspace\Ex_Ant\src\com\demo\ant\WriteHelper.java:106
: cannot find symbol
    [javac] symbol  : class Label
    [javac] location: class com.demo.ant.WriteHelper
    [javac]                     Label label9=new Label(9,k,JavaSamp.maxsysval,ti
mesBoldUnderline);
    [javac]                                      ^
    [javac] C:\Users\FSSD\workspace\Ex_Ant\src\com\demo\ant\WriteHelper.java:115
: cannot find symbol
    [javac] symbol  : class Label
    [javac] location: class com.demo.ant.WriteHelper
    [javac]             Label label;
    [javac]             ^
    [javac] C:\Users\FSSD\workspace\Ex_Ant\src\com\demo\ant\WriteHelper.java:116
: cannot find symbol
    [javac] symbol  : class Label
    [javac] location: class com.demo.ant.WriteHelper
    [javac]             label = new Label(column, row, s, timesBoldUnderline);
    [javac]                         ^
    [javac] 83 errors

BUILD FAILED
C:\Users\FSSD\workspace\Ex_Ant\build.xml:7: Compile failed; see the compiler err
or output for details.

Total time: 2 seconds

可能是什么原因？

我的蚂蚁文件如下：

<?xml version="1.0" ?>
<project name="Ant Example" default="execute">

<target name="init" depends="clean">
<mkdir dir="build/classes" />
</target>

<target name="compile" depends="init">
<javac srcdir="src" destdir="build/classes" />
</target>

<target name="execute" depends="compile">
<java classname="com.demo.ant.JavaSamp" classpath="build/classes" />
</target>

<target name="clean">
<delete dir="build" />
</target>

</project>

Answer 1

编译类时，您没有加载Java库。做这样的事情：

将其添加到您的ant文件中：

<path id="project.class.path">
    <pathelement location="src" />
    <pathelement path="${java.class.path}/" />
</path>

然后在编译任务中：

<property name="cp" refid="project.class.path" />
<javac srcdir="src" destdir="build/classes" classpath="${cp}">
</javac>

这里<pathelement location="src" />给出了ant文件所在位置src的相对路径。或者你也可以给出绝对的路径。

您可能还需要根据应用程序添加更多类路径依赖项。简而言之，在project.class.path中为所有必需的jar [如果你有任何默认的java lib]提供jar文件夹的路径。

Answer 2

似乎导入了Label或缺少相应的类路径条目。您是否已成功编译该代码？

将<classpath>元素添加到<javac>元素。

Answer 3

使用什么编辑器？你能在编辑器中编译吗？如果是，那么您需要在构建文件中定义类路径（类似于编辑器中的类路径）。

尝试通过ANT运行swing代码时出现异常

3 个答案: