java实现文件编码转换的方法

在开发过程中，可能会遇到文件编码的转换，虽然说开发工具eclipse可以转换编码，但是有的情况却很不方便。比如，原来文件本身的编码是GBK，现在要转换成UTF-8，如果直接在eclipse中把文件编码修改成UTF-8，恭喜你，是乱码，因为不能直接从GBK到UTF-8进行转换，这时就需要我们手动的来转换编码。下面是一个文件编码转换的工具类。

package com.mikan.stuff; 
 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileOutputStream; 
import java.io.FilenameFilter; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.OutputStream; 
import java.io.OutputStreamWriter; 
import java.nio.charset.Charset; 
import java.nio.charset.UnsupportedCharsetException; 
 
public class FileCharsetConverter { 
 
  public static void main(String[] args) throws Exception { 
    convert("D:\stuff\src\main\java\com\mikan\stuff\test.txt", 
 "GBK", "UTF-8", new FilenameFilter() { 
   @Override 
   public boolean accept(File dir, String name) { 
     return name.endsWith("txt"); 
   } 
 }); 
  } 
 
   
  public static void convert(String fileName, String fromCharsetName, 
      String toCharsetName) throws Exception { 
    convert(new File(fileName), fromCharsetName, toCharsetName, null); 
  } 
 
   
  public static void convert(File file, String fromCharsetName, 
      String toCharsetName) throws Exception { 
    convert(file, fromCharsetName, toCharsetName, null); 
  } 
 
   
  public static void convert(String fileName, String fromCharsetName, 
      String toCharsetName, FilenameFilter filter) throws Exception { 
    convert(new File(fileName), fromCharsetName, toCharsetName, filter); 
  } 
 
   
  public static void convert(File file, String fromCharsetName, 
      String toCharsetName, FilenameFilter filter) throws Exception { 
    if (file.isDirectory()) { 
      File[] fileList = null; 
      if (filter == null) { 
 fileList = file.listFiles(); 
      } else { 
 fileList = file.listFiles(filter); 
      } 
      for (File f : fileList) { 
 convert(f, fromCharsetName, toCharsetName, filter); 
      } 
    } else { 
      if (filter == null 
   || filter.accept(file.getParentFile(), file.getName())) { 
 String fileContent = getFileContentFromCharset(file, 
     fromCharsetName); 
 saveFile2Charset(file, toCharsetName, fileContent); 
      } 
    } 
  } 
 
   
  public static String getFileContentFromCharset(File file, 
      String fromCharsetName) throws Exception { 
    if (!Charset.isSupported(fromCharsetName)) { 
      throw new UnsupportedCharsetException(fromCharsetName); 
    } 
    InputStream inputStream = new FileInputStream(file); 
    InputStreamReader reader = new InputStreamReader(inputStream, 
 fromCharsetName); 
    char[] chs = new char[(int) file.length()]; 
    reader.read(chs); 
    String str = new String(chs).trim(); 
    reader.close(); 
    return str; 
  } 
 
   
  public static void saveFile2Charset(File file, String toCharsetName, 
      String content) throws Exception { 
    if (!Charset.isSupported(toCharsetName)) { 
      throw new UnsupportedCharsetException(toCharsetName); 
    } 
    OutputStream outputStream = new FileOutputStream(file); 
    OutputStreamWriter outWrite = new OutputStreamWriter(outputStream, 
 toCharsetName); 
    outWrite.write(content); 
    outWrite.close(); 
  } 
} 

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