Java Class 映射及实用工具类完整源代码

package com.elink.util;

/*
 * <p>Company: 凌科软件 www.elingke.com </p>
 * @author liubaojun
 * @version 1.0
 * Created on 2004-11-29
 * 来源于 elinkBSP 部分源代码
 */

import java.lang.reflect.*;
import java.net.*;

public class ClassUtil
{
 /**
   @param strClassName
   @param argsType
   @param args
   @return Object
   @throws java.lang.NoSuchMethodException
   @throws java.lang.SecurityException
   @throws java.lang.ClassNotFoundException
   @throws java.lang.InstantiationException
   @throws java.lang.IllegalAccessException
   @throws java.lang.IllegalArgumentException
   @throws java.lang.reflect.InvocationTargetException
  */
 public static Object loadClass(String strClassName, Class[] argsType,
       Object[] args)
  throws NoSuchMethodException, SecurityException, ClassNotFoundException,
  InstantiationException, IllegalAccessException,
  IllegalArgumentException, InvocationTargetException
 {
  Object returnObj = null;
  Class className = null;
  Constructor constructor = null;
  className = Class.forName(strClassName);
  constructor = className.getConstructor(argsType);
  returnObj = constructor.newInstance(args);
  return returnObj;
 }

 /**
   @param strClassName
   @return Object
   @throws java.lang.NoSuchMethodException
   @throws java.lang.SecurityException
   @throws java.lang.ClassNotFoundException
   @throws java.lang.InstantiationException
   @throws java.lang.IllegalAccessException
   @throws java.lang.IllegalArgumentException
   @throws java.lang.reflect.InvocationTargetException
  */
 public static Object loadClass(String strClassName)
  throws NoSuchMethodException, SecurityException, ClassNotFoundException,
  InstantiationException, IllegalAccessException,
  IllegalArgumentException, InvocationTargetException
 {
  return loadClass(strClassName, null, null);
 }
 
 public static Object loadClass(String strClassName, Object defObj)
 {
  try
  {
   return loadClass(strClassName, null, null);
  }
  catch( Throwable ex )
  {
   LogUtil.logException( ex );
  }
  return defObj;
 }

 /**
   @param classObject
   @param strMethodName
   @param argsType
   @param args
   @return Object
   @throws java.lang.NoSuchMethodException
   @throws java.lang.SecurityException
   @throws java.lang.IllegalAccessException
   @throws java.lang.IllegalArgumentException
   @throws java.lang.reflect.InvocationTargetException
  */
 public static Object invokeMothod(Object classObject, String strMethodName,
          Class[] argsType, Object[] args)
  throws NoSuchMethodException, SecurityException, IllegalAccessException,
  IllegalArgumentException, InvocationTargetException
 {
  Method concatMethod = classObject.getClass().getMethod(strMethodName,
   argsType);
  return concatMethod.invoke(classObject, args);
 }

 /**
   @param classObject
   @param strMethodName
   @return Object
   @throws java.lang.NoSuchMethodException
   @throws java.lang.SecurityException
   @throws java.lang.IllegalAccessException
   @throws java.lang.IllegalArgumentException
   @throws java.lang.reflect.InvocationTargetException
  */
 public static Object invokeMothod(Object classObject, String strMethodName)
  throws NoSuchMethodException, SecurityException, IllegalAccessException,
  IllegalArgumentException, InvocationTargetException
 {
  return invokeMothod(classObject, strMethodName, null, null);
 }

 /**
   @param classObject
   @param strFieldName
   @return Object
   @throws java.lang.NoSuchFieldException
   @throws java.lang.SecurityException
   @throws java.lang.IllegalArgumentException
   @throws java.lang.IllegalAccessException
  */
 public static Object getFieldValue(Object classObject, String strFieldName)
  throws NoSuchFieldException, SecurityException,
  IllegalArgumentException, IllegalAccessException
 {
  Object retObj = null;
  Field field;
  field = classObject.getClass().getDeclaredField(strFieldName);
  retObj = field.get(classObject);
  return retObj;
 }

 /**
   @param className
   @return String
  */
 public static String whereClass(String className)
 {
  String retStr = null;
  if (!className.startsWith("/"))
  {
   className = "/" + className;
  }
  className = className.replace('.', '/');
  className = className + ".class";
  java.net.URL classUrl = getResource(className);
  if (classUrl != null)
  {
   String str = classUrl.getFile();
   retStr = str;
  }
  return retStr;
 }

 /**
   @param name
   @return java.net.URL
  */
 public static URL getResource(String name)
 {
  return ClassUtil.class.getResource(name);
 }
 
 public static void compiler( String targetDir, String filename, String classpath ) throws Exception
 {
//   javac -d E:/test  -classpath C:\work\WEB-INF\lib\bss.jar e:/test/TestVector.java
  String str = "javac -d "+targetDir+" -classpath "+classpath+" "+filename;
  LogUtil.logInfo( str );
  Runtime runtime = Runtime.getRuntime();
  Process p = runtime.exec( str );
 }
 
 public static void compiler( String targetDir, String filename ) throws Exception
 {
//   javac -d E:/test  -classpath C:\work\WEB-INF\lib\bss.jar e:/test/TestVector.java
  Runtime runtime = Runtime.getRuntime();
  Process p = runtime.exec( "javac -d "+targetDir+" "+filename );
 }
}

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