java實現文件編碼格式的轉化

本文主要是用Java實現文件編碼格式的轉換，處理各種亂碼問題。

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.util.Vector;

public class AnsiToUtf8
{

	public static void main(String[] args) throws UnsupportedEncodingException,
			IOException
	{

		ReadFileName tmp = new ReadFileName();
		Vector<String> vec = tmp.FileNameOftype("file\\comments", ".txt");
		int size = vec.size();
		System.out.println(size);
		for (int i = 0; i < size; i++)
		{
			change(vec.get(i));
			System.out.println(vec.get(i) + "  " + i);
		}

	}

	public static void change(String filepath)
			throws UnsupportedEncodingException, IOException
	{
		BufferedReader buf = null;
		OutputStreamWriter pw = null;
		String str = null;
		String allstr = "";

		// 用於輸入換行符的字節碼
		byte[] c = new byte[2];
		c[0] = 0x0d;
		c[1] = 0x0a;
		String t = new String(c);

		buf = new BufferedReader(new InputStreamReader(new FileInputStream(
				filepath), "gb2312"));			//gb2312轉成其他的編碼
		
		
		/*	GBK轉成其體的編碼
		buf = new BufferedReader(new InputStreamReader(new FileInputStream(
				filepath), "GBK"));*/
		
		
		while ((str = buf.readLine()) != null)
		{
			allstr = allstr + str + t;
		}

		buf.close();

		pw = new OutputStreamWriter(new FileOutputStream(filepath), "UTF-8");		//最終要轉換成的文件的編碼格式是utf-8
		pw.write(allstr);
		pw.close();
	}

}

class ReadFileName
{

	// 存儲遍歷獲取的所有文件名
	private Vector<String> filelist = new Vector<String>();

	// 遍歷指定路徑下的所有文件
	// 以ArrayList存儲於filelist中
	private void RefreshFileList(String strpath)
	{
		File dir = new File(strpath);
		File[] files = dir.listFiles();

		if (files == null)
			return;
		for (int i = 0; i < files.length; i++)
		{
			if (files[i].isDirectory())
			{
				RefreshFileList(files[i].getAbsolutePath());
			} else
			{
				filelist.add(files[i].getAbsolutePath());
			}
		}
	}

	 //過濾當前目錄下的指定後綴名的文件  
    //返回Vector  
	public Vector<String> FileNameOftype(String strpath2, String filetype)
	{
		String strfilename = new String();
		Vector<String> filelistofType = new Vector<String>();

		//讀取指定路徑下的所有文件 
		RefreshFileList(strpath2);

		for (int i = 0; i < filelist.size(); i++)
		{
			strfilename = filelist.get(i).toString();
			strfilename = strfilename.substring(strfilename.length() - 4,
					strfilename.length());

			if (strfilename.equals(filetype))
			{
				filelistofType.add(filelist.get(i));
			}
		}
		return filelistofType;
	}

}

本文轉自：http://blog.csdn.net/bwgang/article/details/7955964