直接上代码，代码依赖tomcat的tomcat-coyote.jar。
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package
guojje.tools;
import
java.io.File;
import
java.io.FileInputStream;
import
java.io.FilenameFilter;
import
java.io.IOException;
import
java.io.InputStream;
import
java.util.Enumeration;
import
java.util.LinkedList;
import
java.util.List;
import
java.util.Queue;
import
java.util.jar.JarEntry;
import
java.util.jar.JarFile;
import
org.apache.tomcat.util.bcel.classfile.AnnotationEntry;
import
org.apache.tomcat.util.bcel.classfile.ClassFormatException;
import
org.apache.tomcat.util.bcel.classfile.ClassParser;
import
org.apache.tomcat.util.bcel.classfile.JavaClass;
public
class
ScanAnnotations {
public
static
void
main(String[] args)
throws
ClassFormatException,
IOException {
File dir =
null
;
if
(args.length >
0
) {
dir =
new
File(args[
0
]);
}
else
{
dir =
new
File(
"."
);
}
File[] jarFiles = dir.listFiles(
new
FilenameFilter() {
@Override
public
boolean
accept(File dir, String name) {
return
name.endsWith(
".jar"
);
}
});
List<File> classFiles =
new
LinkedList<File>();
Queue<File> fileQueue =
new
LinkedList<File>();
fileQueue.offer(dir);
File curFile =
null
;
while
((curFile = fileQueue.poll()) !=
null
) {
File[] subFiles = curFile.listFiles();
for
(File sub : subFiles) {
if
(sub.isDirectory()) {
fileQueue.offer(sub);
}
else
if
(sub.getName().endsWith(
".class"
)) {
classFiles.add(sub);
}
}
}
for
(File jf : jarFiles) {
System.out.println(jf.getName());
JarFile jarFile =
new
JarFile(jf);
scanJarAnnotaiton(jarFile);
}
for
(File cf : classFiles) {
System.out.println(
"==="
+ cf.getAbsolutePath() +
"==================="
);
scanClassFileAnnotaiton(cf);
}
}
public
static
void
scanJarAnnotaiton(JarFile jarFile)
throws
IOException {
Enumeration<JarEntry> ej = jarFile.entries();
while
(ej.hasMoreElements()) {
JarEntry je = ej.nextElement();
if
(!je.isDirectory() && je.getName().endsWith(
".class"
)) {
InputStream classStream = jarFile.getInputStream(je);
ClassParser classParser =
new
ClassParser(classStream);
JavaClass jc = classParser.parse();
if
(jc.getAnnotationEntries() !=
null
&& jc.getAnnotationEntries().length >
0
) {
System.out.println(
"==="
+ jarFile.getName() +
"======="
+ jc.getClassName() +
"========================="
);
for
(AnnotationEntry ae : jc.getAnnotationEntries()) {
System.out.println(ae.getAnnotationType());
}
}
}
}
}
public
static
void
scanClassFileAnnotaiton(File cf)
throws
IOException {
if
(!cf.isDirectory() && cf.getName().endsWith(
".class"
)) {
InputStream classStream =
new
FileInputStream(cf);
ClassParser classParser =
new
ClassParser(classStream);
JavaClass jc = classParser.parse();
if
(jc.getAnnotationEntries() !=
null
&& jc.getAnnotationEntries().length >
0
) {
System.out.println(
"==="
+ cf.getAbsolutePath() +
"================="
);
for
(AnnotationEntry ae : jc.getAnnotationEntries()) {
System.out.println(ae.getAnnotationType());
}
}
}
}
}
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本文转自 anranran 51CTO博客，原文链接:http://blog.51cto.com/guojuanjun/1826325
