【CSDN常见问题解答】目录文件编码转换

有时候导入一个工程到Eclipse中发现中文乱码了。原因就是工程的编码格式变了。比如从UTF-8变成了GBK等等。此时我们手动去改的话十分麻烦。下面这个类就是用来改变整个目录的编码的，详细请看代码。
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileFilter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import java.io.Writer;

public class FileEncodeConverter {

// 原文件目录
private static String srcDir = "x:/src";
// 转换后的存放目录
private static String desDir = "x:/des";
// 源文件编码
private static String srcEncode = "gb2312";
// 输出文件编码
private static String desEncode = "utf-8";

// 处理的文件过滤
private static FileFilter filter = new FileFilter() {
public boolean accept(File pathname) {
// 只处理：目录 或是 .java文件
if (pathname.isDirectory()
|| (pathname.isFile() && pathname.getName().endsWith(
".java")))
return true;
else
return false;
}
};

/**
* @param file
*/
public static void readDir(File file)
{
File[] files = file.listFiles(filter);
for (File subFile : files) {
// 建立目标目录
if (subFile.isDirectory()) {
File file3 = new File(desDir + subFile.getAbsolutePath().substring(srcDir.length()));
if (!file3.exists()) {
file3.mkdir();
}
file3 = null;
readDir(subFile);
} else {
System.err.println("一源文件：\t"+subFile.getAbsolutePath() + "\n目标文件：\t" + (desDir + subFile.getAbsolutePath().substring(srcDir.length())));
System.err.println("-----------------------------------------------------------------");
try {
convert(subFile.getAbsolutePath(), desDir + subFile.getAbsolutePath().substring(srcDir.length()), srcEncode, desEncode);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}

/**
*
* @param infile 源文件路径
* @param outfile 输出文件路径
* @param from 源文件编码
* @param to 目标文件编码
* @throws IOException
* @throws UnsupportedEncodingException
*/
public static void convert(String infile, String outfile, String from,
String to) throws IOException, UnsupportedEncodingException {
// set up byte streams
InputStream in;
if (infile != null)
in = new FileInputStream(infile);
else
in = System.in;
OutputStream out;
if (outfile != null)
out = new FileOutputStream(outfile);
else
out = System.out;

// Use default encoding if no encoding is specified.
if (from == null)
from = System.getProperty("file.encoding");
if (to == null)
to = System.getProperty("file.encoding");

// Set up character stream
Reader r = new BufferedReader(new InputStreamReader(in, from));
Writer w = new BufferedWriter(new OutputStreamWriter(out, to));

// Copy characters from input to output. The InputStreamReader
// converts from the input encoding to Unicode,, and the
// OutputStreamWriter
// converts from Unicode to the output encoding. Characters that cannot
// be
// represented in the output encoding are output as '?'
char[] buffer = new char[4096];
int len;
while ((len = r.read(buffer)) != -1)
w.write(buffer, 0, len);
r.close();
w.flush();
w.close();
}

public static void main(String[] args) {
// 建立目标文件夹
File desFile = new File(desDir);
if (!desFile.exists()) {
desFile.mkdir();
}
desFile = null;

File srcFile = new File(srcDir);
// 读取目录 循环转换文件
readDir(srcFile);
srcFile = null;
}

}