ClassFileLoader.java

package ClassFileLoader;

import java.io.ByteArrayOutputStream; 
import java.io.File; 
import java.io.FileInputStream; 
import java.util.ArrayList; 
import java.util.Arrays; 
import java.util.List; 

public class ClassFileLoader { 
	private List<String> clzPaths = new ArrayList<String>(); 
	private static final int BUFFER_SIZE = 1024; 
	public byte[] readBinaryCode(String className) { 
		byte[] result = null; 
		for(String path : clzPaths){ 
			File file = new File(getPath(path, className)); 
			if(!file.exists()){ 
				continue; 
			} 
			result = readFile(file);	 
		} 
		return result; 
	} 
	/** 
	 * �ļ����ݴ�����ֽ������з��� 
	 */ 
	private byte[] readFile(File file){ 
		FileInputStream fileInputStream; 
		byte[] buffer = new byte[BUFFER_SIZE]; 
		ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); 
		try { 
			fileInputStream = new FileInputStream(file); 
			while(byteArrayOutputStream.size() < file.length()){ 
				int len = fileInputStream.read(buffer); 
				if(len < 0){ 
					break; 
				} 
				byteArrayOutputStream.write(buffer, 0, len); 
			}	 
		} catch (Exception e) { 
			e.printStackTrace(); 
		} 
		if(byteArrayOutputStream.size() > file.length()){ 
			byte[] result = byteArrayOutputStream.toByteArray(); 
			return Arrays.copyOf(result, (int)file.length()); 
		} 
		return byteArrayOutputStream.toByteArray(); 
	} 
	/** 
	 * ��ȡ��ʵ·��·�� 
	 */ 
	private String getPath(String path ,String className){ 
		System.out.println(className); 
		String [] ways = className.split("\\."); 
		for (String string : ways) { 
			System.out.println(string); 
		} 
		StringBuilder builder = new StringBuilder(); 
		builder.append(path); 
		for (String string : ways) { 
			builder.append("\\"); 
			builder.append(string); 
		} 
		builder.append(".class"); 
		System.out.println(builder.toString()); 
		return builder.toString(); 
	} 
	private byte[] loadClassFile(String clzFileName) { 
		return null; 
	} 
	public void addClassPath(String path) { 
		clzPaths.add(path); 
} 
	public String getClassPath_V1(){ 
		return  null; 
	}
 
	public String getClassPath(){
		StringBuilder builder = new StringBuilder();
		for(int i = 0; i < clzPaths.size(); i++){
			builder.append(clzPaths.get(i));
			if(i < clzPaths.size() - 1){ 
				builder.append(";"); 
			}
		} 
		return builder.toString(); 
	} 
}