我正在使用Java和Mozilla Rhino创建一个游戏引擎,我希望所有错误调用一个函数并向其提供错误消息,如

...
} catch(Exception e) {
    Abort(e);
}
...
public void Abort(str) {
    System.out.println("Script error in "current_script_name+" line: "+line_number\n\n"+e);
}

对于RhinoException来说这很容易,但是我想为其他人提供相同的东西,比如IOException.

解决方法:

这取决于如何抛出异常,所以我需要猜测.它取决于您用于执行Rhino的优化级别.

我猜测异常是从本机Java代码中抛出的(即,你没有使用throw new Packages.java.io.IOException(“…”)).在这种情况下,您可以使用printStackTrace()来解决它.这是一个小脚本(名为test.jsh.js,您将在堆栈跟踪中看到),您可以在Rhino shell中运行：

try {
    //  foo does not exist
    var stream = new Packages.java.io.FileInputStream("foo");
} catch (e) {
    e.rhinoException.printStackTrace();
}

……及其输出：

$java -jar $(cygpath -w /opt/java/rhino/1.7R2/js.jar) -opt -1 test.jsh.js
org.mozilla.javascript.WrappedException: Wrapped java.io.FileNotFoundException: foo (The system cannot find the file specified) (test.jsh.js#4)
        at org.mozilla.javascript.Context.throwAsScriptRuntimeEx(Context.java:1773)
        at org.mozilla.javascript.MemberBox.newInstance(MemberBox.java:202)
        at org.mozilla.javascript.NativeJavaClass.constructSpecific(NativeJavaClass.java:281)
        at org.mozilla.javascript.NativeJavaClass.construct(NativeJavaClass.java:200)
        at org.mozilla.javascript.Interpreter.interpretLoop(Interpreter.java:3377)
        at script(test.jsh.js:4)
        at org.mozilla.javascript.Interpreter.interpret(Interpreter.java:2487)
        at org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.java:164)
        at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:398)
        at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3065)
        at org.mozilla.javascript.InterpretedFunction.exec(InterpretedFunction.java:175)
        at org.mozilla.javascript.tools.shell.Main.evaluateScript(Main.java:564)
        at org.mozilla.javascript.tools.shell.Main.processFileSecure(Main.java:486)
        at org.mozilla.javascript.tools.shell.Main.processFile(Main.java:452)
        at org.mozilla.javascript.tools.shell.Main.processSource(Main.java:443)
        at org.mozilla.javascript.tools.shell.Main.processFiles(Main.java:196)
        at org.mozilla.javascript.tools.shell.Main$IProxy.run(Main.java:117)
        at org.mozilla.javascript.Context.call(Context.java:515)
        at org.mozilla.javascript.ContextFactory.call(ContextFactory.java:507)
        at org.mozilla.javascript.tools.shell.Main.exec(Main.java:179)
        at org.mozilla.javascript.tools.shell.Main.main(Main.java:157)
Caused by: java.io.FileNotFoundException: foo (The system cannot find the file specified)
        at java.io.FileInputStream.open(Native Method)
        at java.io.FileInputStream.(Unknown Source)
        at java.io.FileInputStream.(Unknown Source)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
        at java.lang.reflect.Constructor.newInstance(Unknown Source)
        at org.mozilla.javascript.MemberBox.newInstance(MemberBox.java:194)
        ... 18 more

如果你真的想要使用上面的Abort()函数,你可以解析上面的堆栈跟踪中的相应行;或者,您可以显示整个堆栈跟踪,这可能会更有帮助,具体取决于您要执行的操作.