Want each class method information from jar file.
Hi All,
I have to find each classes method information like its return type, argument etc. from jar file. Till now i got the class name from the jar. When i used reflection on class then its gives different method name which are not present in the class.
So what should i do?
See the code:
import java.io.*;
import java.lang.reflect.Method;
import java.util.*;
import java.util.jar.*;
public class JarDir
{
public static void main (String args[])throws IOException
{
if (args.length != 1)
{
System.out.println("Please provide a JAR filename");
System.exit(-1);
}
JarFile jarFile = new JarFile(args[0]);
Enumeration enum1 = jarFile.entries();
while (enum1.hasMoreElements())
{
process(enum1.nextElement());
}
}
private static void process(Object obj)
{
JarEntry entry = (JarEntry)obj;
String name = entry.getName();
if (name.endsWith(".class"))
{
Class c = obj.getClass();
Method[] theMethods = c.getMethods();
for (int i = 0; i < theMethods.length; i++) {
String methodString = theMethods.getName();
System.out.println("Name: " + methodString);
String returnString =
theMethods.getReturnType().getName();
System.out.println("Return Type: " + returnString);
Class[] parameterTypes = theMethods.getParameterTypes();
System.out.print("Parameter Types:");
for (int k = 0; k < parameterTypes.length; k ++) {
String parameterString = parameterTypes[k].getName();
System.out.print(" " + parameterString);
}
System.out.println();
}
}
long size = entry.getSize();
long compressedSize = entry.getCompressedSize();
System.out.println(name + "\t" + size + "\t" + compressedSize);
}
}
*************************************************************************
Cmd argument : java JarDir jar-path
*************************************************************************
please help me and thanx in advance
-bunty
# 4
Hi georgemc .
I have used that but it gives exception :
java.lang.ClassNotFoundException: Hello
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at JarDir.load_class(JarDir.java:55)
at JarDir.process(JarDir.java:34)
at JarDir.main(JarDir.java:24)
Exception in thread "main" java.lang.NullPointerException
at JarDir.process(JarDir.java:35)
at JarDir.main(JarDir.java:24)
The code is :
***************************************
import java.io.*;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.*;
import java.util.jar.*;
public class JarDir
{
public static void main (String args[])throws IOException
{
/*if (args.length != 1)
{
System.out.println("Please provide a JAR filename");
System.exit(-1);
}*/
JarFile jarFile = new JarFile("F:\\ProxyGenerator\\ProxyGeneratorTool\\Hello.jar");
Enumeration enum1 = jarFile.entries();
while (enum1.hasMoreElements())
{
process(enum1.nextElement());
}
}
private static void process(Object obj)
{
JarEntry entry = (JarEntry)obj;
String name = entry.getName();
if (name.endsWith(".class"))
{
Class myClass = load_class("Hello");
System.out.println(myClass.getName());
Method[] theMethods = myClass.getDeclaredMethods();
for (int i = 0; i < theMethods.length; i++)
{
String methodString = theMethods.getName();
System.out.println("Name: " + methodString);
}
}
long size = entry.getSize();
long compressedSize = entry.getCompressedSize();
System.out.println(name + "\t" + size + "\t" + compressedSize);
}
private static Class load_class(String className)
{
try
{
File file = new File(".");
//ClassLoader loader = new URLClassLoader(new URL[] {file.toURL()});
ClassLoader loader = new URLClassLoader(new URL[] {file.toURL()});
return loader.loadClass(className);
}
catch (ClassNotFoundException e) { e.printStackTrace(); }
catch (MalformedURLException e) { e.printStackTrace(); }
return null;
}
}
****************************************************************************
If i am doing any mistake any where please let me know.
This is very important for me.
Thanks.
