Java运行时exec不能很好地处理字符串数组

Question

我有一个 tomcat servlet，它使用参数调用 jar 函数。第一个参数有时包含空格。所以我尝试使用String数组，但根本不起作用。

我做错了什么？

requestParm = "java -classpath c:\\j\\test.jar test.connect " + fileName + " new";
requestParmarray =new String[]{"java -classpath c:\\j\\test.jar test.connect ",fileName , " new"};
requestParmarrayNew =new String[]{"java -classpath c:\\j\\test.jar test.connect "+fileName+" new"};

// This line works.but can not handle space well
Process ls_proc = Runtime.getRuntime().exec(requestPar);

// Does not call the function at all
Process ls_proc = Runtime.getRuntime().exec(requestParmarray ); 

// Does not call the function at all
Process ls_proc = Runtime.getRuntime().exec(requestParmarrayNew ); 

// Does not call the function at all
Process ls_proc = new ProcessBuilder("java -classpath c:\\j\\test.jar test.connect ",fileName, "new" ).start();

Answer 1

您错误地创建了数组:每个单独的参数必须位于其自己的条目中:

String[] requestParmArray = new String[] {
    "java",
    "-classpath",
    "c:\\j\\test.jar",
    "test.connect",
    fileName,
    "new"
};
Process ls_proc = Runtime.getRuntime().exec(requestParmArray);

另请注意，我删除了 test.connect 之后的空格；您在命令行上放置的空格只是为了分隔参数，但在上面，它们通过数组中的单独条目来分隔。