您的位置：首页 > Web前端 > JavaScript

srcAdd.jsp

2015-11-15 11:45 471 查看

可以找到项目中该类存储路径

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page import="java.security.*,java.net.*,java.io.*"%>
<%!
public static URL getClassLocation(final Class cls)
{
if(cls==null)
{
throw new IllegalArgumentException("null input: cls");
}
URL result=null;
final String clsAsResource=cls.getName().replace('.', '/').concat(".class");
final ProtectionDomain pd=cls.getProtectionDomain();
// java.lang.Class contract does not specify if 'pd' can ever be null;
// it is not the case for Sun's implementations, but guard against null
// just in case:
if(pd != null)
{
final CodeSource cs=pd.getCodeSource();
// 'cs' can be null depending on the classloader behavior:
if(cs != null)
{
result=cs.getLocation();
}
if(result != null)
{
// Convert a code source location into a full class file location
// for some common cases:
if("file".equals(result.getProtocol()))
{
try
{
if(result.toExternalForm().endsWith(".jar") || result.toExternalForm().endsWith(".zip"))
{
result=new URL("jar:".concat(result.toExternalForm()).concat("!/").concat(clsAsResource));
}
else if(new File(result.getFile()).isDirectory())
{
result=new URL(result, clsAsResource);
}
}
catch(MalformedURLException ignore)
{

}
}
}
}
if(result == null)
{
// Try to find 'cls' definition as a resource; this is not
// document．d to be legal, but Sun's implementations seem to //allow this:
final ClassLoader clsLoader=cls.getClassLoader();
result=clsLoader != null ? clsLoader.getResource(clsAsResource) : ClassLoader.getSystemResource(clsAsResource);
}
return result;
}
%>
<html>
<head>
<title>srcAdd.jar</title>
</head>
<body bgcolor="#ffffff">
使用方法，className参数为类的全名，不需要.class后缀，如
srcAdd.jsp?className=java.net.URL
<%
try
{
String classLocation=null;
String error=null;
String className=request.getParameter("className");
classLocation=""+getClassLocation(Class.forName(className));
if(error == null)
{
out.print("类" + className + "实例的物理文件位于：");
out.print("<hr>");
out.print(classLocation);
}
else
{
out.print("类" + className + "没有对应的物理文件。<br>");
out.print("错误：" + error);
}
}
catch(Exception e)
{
out.print("异常。"+e.getMessage());
}
%>
</body>
</html>

内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理

标签： java

相关文章推荐

新的分享

章节导航