文件编码格式ANSI转UTF8

来源：互联网发布：php 小项目不用 mvc 编辑：程序博客网时间：2024/05/29 03:56

前几天因项目需要，在网上找了些转格式工具，转换出来会出现中文乱码，于是写了一个小程序来转换。
因为本项目中只会出现ANSI和UTF8编码，于是只需要判断是否为UTF8。
判断编码格式部分出自:
http://blog.163.com/wf_shunqiziran/blog/static/176307209201258102217810/

package test;import java.io.BufferedInputStream;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.io.PrintWriter;public class AnsiToUtf8 {    /**     * 读写文件方式改变文件编码格式     * @param path     * @throws IOException     */    public static void ansiToUTF8(String path) throws IOException{        BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(path), "GB2312"));        String all = "";        String line = null;        while((line = br.readLine()) != null){            all += line + "\r\n";        }        br.close();        PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(new FileOutputStream(path), "UTF-8")));        out.write(all);        out.flush();        out.close();    }    /**     * 判断文件编码格式是否为UTF8     * @param path     * @return     * @throws IOException     */    public static boolean isUTF8(String path) throws IOException{        BufferedInputStream bis = new BufferedInputStream(new FileInputStream(path));        byte[] b = new byte[3];        bis.mark(0);        bis.read(b, 0, 3);        if(b[0] == (byte)0xEF && b[1] == (byte)0xBB && b[2] == (byte)0xBF){            bis.close();            return true;        }        bis.reset();        int read;        while((read = bis.read()) != -1){            if (read >= 0xF0)                break;            if (0x80 <= read && read <= 0xBF) // 单独出现BF以下的，也算是GBK                break;            if (0xC0 <= read && read <= 0xDF) {                read = bis.read();                if (0x80 <= read && read <= 0xBF) // 双字节 (0xC0 - 0xDF)                    continue;                else                    break;            } else if (0xE0 <= read && read <= 0xEF) {// 也有可能出错，但是几率较小                read = bis.read();                if (0x80 <= read && read <= 0xBF) {                    read = bis.read();                    if (0x80 <= read && read <= 0xBF) {                        bis.close();                        return true;                    } else                        break;                } else                    break;            }        }        bis.close();        return false;    }    /**     * 遍历文件夹下所有文件     * @param dir     * @throws IOException     */    public static void traverseFolder(File dir) throws IOException{        File[] files = dir.listFiles();        for (File file : files) {//          System.out.println(file.getName());            if(file.isDirectory()){                traverseFolder(file);            }            else if(file.getName().endsWith(".java") && !isUTF8(file.getAbsolutePath())){                ansiToUTF8(file.getAbsolutePath());            }        }    }    public static void main(String[] args){        File dir = new File("d:\\test");        try {            traverseFolder(dir);        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }}

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