Question

java 检测class文件走哪个jar包的代码

Answer 1

ClassLoader classloader =
org.apache.poi.poifs.filesystem.POIFSFileSystem.class.getClassLoader();
URL res = classloader.getResource(
"org/apache/poi/poifs/filesystem/POIFSFileSystem.class");
String path = res.getPath();
System.out.println("POI Core came from " + path);

classloader = org.apache.poi.POIXMLDocument.class.getClassLoader();
res = classloader.getResource("org/apache/poi/POIXMLDocument.class");
path = res.getPath();
System.out.println("POI OOXML came from " + path);

classloader = org.apache.poi.hslf.HSLFSlideShow.class.getClassLoader();
res = classloader.getResource("org/apache/poi/hslf/HSLFSlideShow.class");
path = res.getPath();
System.out.println("POI Scratchpad came from " + path);

检测后，发现确实有一个class走了老包，只删java build path没生效。后来把workspace里面的包删了再把project clean一下，然后重新部署，OK，问题解决了！