jsp实现点击help打开chm文件

a href="#" onclick="javascript:$.getJSON('%=path %>/admin/openYACShelp.jsp?req='+new Date(),function(json) {});"
id="openYACShelp">帮助/a>

%
String ch1="/";
String ch2="//";

String contextPath = System.getProperty("user.dir");
String helpFilePath = contextPath + "/yacs/帮助.chm";

Runtime.getRuntime().exec("hh.exe "+helpFilePath.replaceAll(ch1,ch2)); %>