java 文本文件 另存为 ANSI UTF-8

D盘新建一文本文件，默认另存为 编码为ANSI

public static void main(String[] args) throws IOException {
		File src = new File("D://test.txt");
		File dest = new File("D://model//test.txt");
		copyFile(src, dest);
	}
	
	public static void copyFile(File src, File dest) throws IOException {
		BufferedReader br = new BufferedReader(new FileReader(src));
		BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(dest),"utf-8"));
		char[] b = new char[1024 * 5];
        int len;
        while ((len = br.read(b)) != -1) {
            bw.write(b, 0, len);
        }
        bw.flush();
        br.close();
        bw.close();
	}
代码运行之后，
D盘model目录下的test.txt另存为 编码为UTF-8

package com.test;

import java.io.BufferedReader;
import java.io.BufferedWriter;
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.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;

public class Main {
	private String DIR_HOME_OLD = "D://model";
	private String DIR_HOME_NEW = "D://model_bak";
	
	/** 
	 * 盘符获取指定文件
	 * @param dir
	 */
	private List<File> findFile(String dir) {
		String patternDate = format();
		File targetDir = new File(dir);
		File[] files = targetDir.listFiles();
		String fileName = null;
		List<File> targetFile = new ArrayList<File>();
		for (File file : files) {
			if (file.isFile()) {
				fileName = file.getName();
				if (fileName.contains(patternDate)) {
					targetFile.add(file);
				}
			}
		}
		return targetFile;
	}
	
	/** 
	 * 是否存在新文件夹中
	 * @param file
	 * @return
	 */
	private boolean exist(File file) {
		File src = new File(DIR_HOME_NEW);
		String[] fileNames = src.list();
		for (String fileName : fileNames) {
			if (fileName.equals(file.getName())) {
				return true;
			}
		}
		return false;
	}
	
	/**
	 * 定时转化文件
	 */
	private void task() {
		Timer timer = new Timer();
		TimerTask task = new TimerTask() {
			@Override
			public void run() {
				List<File> targetFile = findFile(DIR_HOME_OLD);
				for (File file : targetFile) {
					if (!exist(file)) {
						try {
							copyFile(file, new File(DIR_HOME_NEW + "//" + file.getName()));
							System.out.println(file.getName() + "拷贝成功！");
						} catch (IOException e) {
							e.printStackTrace();
						}
					}
				}
			}
		};
		timer.schedule(task, 1000, 1000 * 60 * 60);//一个小时运行一次
	}
	
	/** 
	 * 获取当天的日期YYYYMMDD格式
	 */
	private String format() {
		return new SimpleDateFormat("yyyyMMdd").format(new Date());
	}
	
	/**
	 * 复制文件到另一文件
	 * @param src
	 * @param dest
	 * @throws IOException
	 */
	private void copyFile(File src, File dest) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(src),"utf-8"));
		//BufferedWriter bw = new BufferedWriter(new FileWriter(dest));
		BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(dest),"Unicode"));
// 刚开始在本地可以，在服务器上面居然变成Unicode big endian，可以把这里替换
// Unicode   --  x-UTF-16LE-BOM
//BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new //FileOutputStream(dest),"x-UTF-16LE-BOM"));
		char[] b = new char[1024 * 5];
        int len;
        while ((len = br.read(b)) != -1) {
            bw.write(b, 0, len);
        }
        bw.flush();
        bw.close();
        br.close();
	}
	
	/**
	 * @param args
	 * @throws IOException 
	 */
	public static void main(String[] args) {
		new Main().task();
	}

}