删除xml注释

import java.io.BufferedReader;   
import java.io.BufferedWriter;
import java.io.File;   
import java.io.FileReader;   
import java.io.FileWriter;
import java.util.Scanner;
  
/**  
 * @author winnie  
 *   
 */  
public class DelComInXml {   
  
    private static final char TAG1 = '<';   
  
    private static final char TAG2 = '!';   
  
    private static final char TAG3 = '-';   
    
    private static final char TAG4 = '>'; 
       
    //斜杠   
    private static final int TYPE_TAG1 = 1;   
       
    //星号   
    private static final int TYPE_TAG2 = 2;   
  
    // 双斜杠类型的注释   
    private static final int TYPE_TAG3 = 3;  
    
//  /*的注释
    private static final int TYPE_TAG4 = 4;   
  
    public static char[] del(char[] _target, int _start, int _end) {   
        char[] tmp = new char[_target.length - (_end - _start + 1)];   
        System.arraycopy(_target, 0, tmp, 0, _start);   
        System.arraycopy(_target, _end + 1, tmp, _start, _target.length - _end   
                - 1);   
        return tmp;   
    }   
  
    public static String delComments(String _target) {   
        int preType = 0;   
        int cur = -1, token = -1;   
        char[] input =  _target.toCharArray();   
        for (cur = 0; cur < input.length; cur++) {   
            if (input[cur] == TAG1) {   
            	if(preType == TYPE_TAG1){
            		preType = TYPE_TAG1;
            	}else if((input[cur+1]==TAG2)&&(input[cur+2]==TAG3)&&(input[cur+3]==TAG3)){
            		preType = TYPE_TAG1;
            		token = cur;   
            	}
            } else if(input[cur] == TAG4){
            	if(preType == TYPE_TAG1){
            		if((input[cur-1] == TAG3)&&(input[cur-2] == TAG3)){
            			input = del(input, token, cur);   
                		cur = token - 1;   
                		preType = 0;   
            		}
            	}
            }
        }
        return new String(input);   
    }   
  
    public static void main(String[] args) {   
        try {   
         Scanner sc =new Scanner(System.in);
        	System.out.println("输入目录：");
        	String dirname = sc.next();
        	File dir = new File(dirname);   
        	File[]   listfile   =   dir.listFiles();  
        	for(int i = 0;i<listfile.length;i++)
        	{
        		BufferedReader reader = new BufferedReader(new FileReader(listfile[i]));   
                StringBuilder content = new StringBuilder();   
                String tmp = null;   
                while ((tmp = reader.readLine()) != null) {   
                    content.append(tmp);   
                    content.append("\n");   
                }   
                String target = content.toString();   
                String target1 = delComments(target); 
                File f = new File(listfile[i]+".bak");
                BufferedWriter output = new BufferedWriter(new FileWriter(f));
                output.write(target);
                output.close();
                BufferedWriter output1 = new BufferedWriter(new FileWriter(listfile[i]));
                output1.write(target1);
                output1.close();
        	}
        } catch (Exception e) {   
  
        }   
    }
}