BCEL-获取类名称,元素名称和方法名称 [英] BCEL - Get Class name,element names ,and method names
本文介绍了BCEL-获取类名称,元素名称和方法名称的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如何使用bcel classparaser获取类名称,元素名称和方法名称?
ive已经找到一种获取类名的方法,但是元素和方法名给我带来了错误。
有人可以帮助我吗?
这是我的代码(此处有一些错误,但未完成):
how to using bcel classparaser to get class names ,element names and method names ? ive already find a way to get class names but element and method names give me something wrong . Anyone can help me with that ? here is my code (with some errors there, and not completed):
import java.io.IOException;
import java.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import org.apache.bcel.classfile.ClassParser;
import org.apache.bcel.generic.ConstantPoolGen;
public final class BcelTest
{
// static int methods;
public static void main(String[] args)
{
ClassParser parser;
try
{
JarFile jar = new JarFile("C:\\Users\\OOO\\Desktop\\Sample.Jar");
Enumeration<JarEntry> entries = jar.entries();
ConstantPoolGen cpg = jar.entries();
while (entries.hasMoreElements())
{
JarEntry entry = entries.nextElement();
if (!entry.getName().endsWith(".class"))
continue;
parser =
new ClassParser("C:\\Users\\OOO\\Desktop\\Sample.Jar",
entry.getName());
methods = getMethodName(cpg);
MyClassVisitor visitor = new MyClassVisitor(parser.parse());
visitor.start();
}
}
catch (IOException e)
{
e.printStackTrace();
}
}
public String getMethodName(ConstantPoolGen cpg)
{
return getMethodName(cpg);
}
}
推荐答案
您可以在 JavaParser
上调用 parse()
以获得 JavaClass
类,其中提供了所有必需的信息:
You can call parse()
on the JavaParser
to obtain a JavaClass
class, which offers all the required information:
import java.io.IOException;
import java.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import org.apache.bcel.classfile.ClassParser;
import org.apache.bcel.classfile.Field;
import org.apache.bcel.classfile.JavaClass;
import org.apache.bcel.classfile.Method;
public final class BcelTest
{
public static void main(String[] args)
{
JarFile jar = null;
try
{
String jarName = "C:/theFile.jar";
jar = new JarFile(jarName);
Enumeration<JarEntry> entries = jar.entries();
while (entries.hasMoreElements())
{
JarEntry entry = entries.nextElement();
if (!entry.getName().endsWith(".class"))
{
continue;
}
ClassParser parser =
new ClassParser(jarName, entry.getName());
JavaClass javaClass = parser.parse();
System.out.println("Class: "+javaClass.getClassName());
System.out.println(" Fields:");
for (Field field : javaClass.getFields())
{
System.out.println(" "+field);
}
System.out.println(" Methods:");
for (Method method : javaClass.getMethods())
{
System.out.println(" "+method);
}
}
}
catch (IOException e)
{
e.printStackTrace();
}
finally
{
if (jar != null)
{
try
{
jar.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
}
}
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