java 获取jar包中的类_读取指定jar包 解析jar包中所有的类（获取到类的方法和属性）...

import java.io.File;

import java.io.IOException;

import java.lang.reflect.Field;

import java.lang.reflect.Method;

import java.net.URL;

import java.net.URLClassLoader;

import java.util.Enumeration;

import java.util.jar.JarEntry;

import java.util.jar.JarFile;

public class jarTest {

public static void getJarName(String jarFile) throws Exception {

try{

//通过将给定路径名字符串转换为抽象路径名来创建一个新File实例

File f = new File(jarFile);

URL url1 = f.toURI().toURL();

URLClassLoader myClassLoader = new URLClassLoader(new URL[]{url1},Thread.currentThread().getContextClassLoader());

//通过jarFile和JarEntry得到所有的类

JarFile jar = new JarFile(jarFile);

//返回zip文件条目的枚举

Enumeration enumFiles = jar.entries();

JarEntry entry;

//测试此枚举是否包含更多的元素

while(enumFiles.hasMoreElements()){

entry = (JarEntry)enumFiles.nextElement();

if(entry.getName().indexOf("META-INF")<0){

String classFullName = entry.getName();

if(!classFullName.endsWith(".class")){

classFullName = classFullName.substring(0,classFullName.length()-1);

} else{

//去掉后缀.class

String className = classFullName.substring(0,classFullName.length()-6).replace("/", ".");

Class> myclass = myClassLoader.loadClass(className);

//打印类名

System.out.println("*****************************");

System.out.println("全类名:" + className);

//得到类中包含的属性

Method[] methods = myclass.getMethods();

for (Method method : methods) {

String methodName = method.getName();

System.out.println("方法名称:" + methodName);

Class>[] parameterTypes = method.getParameterTypes();

for (Class> clas : parameterTypes) {

// String parameterName = clas.getName();

String parameterName = clas.getSimpleName();

System.out.println("参数类型:" + parameterName);

}

System.out.println("==========================");

}

}

}

}

} catch(IOException e){

e.printStackTrace();

}

}

/**

* 这些默认方法不打印

*/

private static String DEFAULT_METHOD = "waitequalsnotifynotifyAlltoStringhashCodegetClass";

public static void main(String[] args) throws Exception {

//jar包所在路径

/*getJarName("F:\\user.jar");

getJarName("F:\\role1.jar");

getJarName("F:\\role2.jar"); */

//getJarName("F:\\UserInfo.jar");

getJarName("F:\\test\\FileTest.jar");

}

}