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java.security.CodeSource; java.security.ProtectionDomain; CodeSource 可以给出类的原始URL的位置，但并不是每个类都有CodeSource。假如类通过引导类装载器装载，CodeSource为空。 import java.lang.reflect.Method; import java.net.URL; import java.security.CodeSource; import java.security.ProtectionDomain; public class Debug { public static void displayClassInfo(Class clazz, StringBuffer results) { displayClassInfo(clazz, results, true); } public static void displayClassInfo(Class clazz, StringBuffer results, boolean showParentClassLoaders) { ClassLoader cl = clazz.getClassLoader(); results.append("/n"+clazz.getName()+"("+Integer.toHexString(clazz.hashCode())+").ClassLoader="+cl); ClassLoader parent = cl; while( parent != null ) { results.append("/n.."+parent); URL[] urls = getClassLoaderURLs(parent); int length = urls != null ? urls.length : 0; for(int u = 0; u < length; u ++) { results.append("/n...."+urls[u]); } if( showParentClassLoaders == false ) break; if( parent != null ) parent = parent.getParent(); } CodeSource clazzCS = clazz.getProtectionDomain().getCodeSource(); if( clazzCS != null ) results.append("/n++++CodeSource: "+clazzCS); else results.append("/n++++Null CodeSource"); results.append("/nImplemented Interfaces:"); Class[] ifaces = clazz.getInterfaces(); for(int i = 0; i < ifaces.length; i ++) { Class iface = ifaces[i]; results.append("/n++"+iface+"("+Integer.toHexString(iface.hashCode())+")"); ClassLoader loader = ifaces[i].getClassLoader(); results.append("/n++++ClassLoader: "+loader); ProtectionDomain pd = ifaces[i].getProtectionDomain(); CodeSource cs = pd.getCodeSource(); if( cs != null ) results.append("/n++++CodeSource: "+cs); else results.append("/n++++Null CodeSource"); } } /** Use reflection to access a URL[] getURLs or ULR[] getAllURLs method so that non-URLClassLoader class loaders, or class loaders that override getURLs to return null or empty, can provide the true classpath info. */ public static URL[] getClassLoaderURLs(ClassLoader cl) { URL[] urls = {}; try { Class returnType = urls.getClass(); Class[] parameterTypes = {}; Method getURLs = cl.getClass().getMethod("getURLs", parameterTypes); if( returnType.isAssignableFrom(getURLs.getReturnType()) ) { Object[] args = {}; urls = (URL[]) getURLs.invoke(cl, args); } } catch(Exception ignore) { } return urls; } } 返回类别: 教程 上一教程: 扬扬的J2EE学习笔记（三）Components and Roles组件和角色2 下一教程: [Eclipse笔记]一些基本概念 您可以阅读与"在java调试中如何获得被装载类的实际路径"相关的教程: · 在JAVA应用程序中如何实现FTP的功能 · java中如何实现表格的多表头显示 · JAVA,JSP,JAVASCRIPT中如何实现将统计表格保存成EXCEL文件 · 在JAVA应用程序中如何实现FTP的功能 (转) · 在Java中如何模仿多继续 |
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