文件（一）--编码问题

来源：互联网发布：淘宝如何改会员名编辑：程序博客网时间：2024/06/05 19:30

几种常见编码如下：

import java.io.UnsupportedEncodingException;public class CoreEncoder {public static void main(String[] args) throws Exception {String str = "就这样YWD";byte[] byte1 = str.getBytes();System.out.print("默认GBK :");for(byte b:byte1){//把字节转换成int以16进制方式表现出来；System.out.print(Integer.toHexString(b&0xff)+" ");}System.out.println();byte[] byte2 = str.getBytes("gbk");System.out.print("GBK     :");for(byte b:byte2){//设置编码为gbk输出System.out.print(Integer.toHexString(b&0xff)+" ");}System.out.println();byte[] byte3 = str.getBytes("utf-8");System.out.print("utf-8   :");for(byte b:byte3){//设置编码为utf-8输出System.out.print(Integer.toHexString(b&0xff)+" ");}System.out.println();byte[] byte4 = str.getBytes("utf-16be");System.out.print("utf-16be:");for(byte b:byte4){//设置编码为gbk输出System.out.print(Integer.toHexString(b&0xff)+" ");}System.out.println();String str1 = new String(byte4);//用项目默认编码System.out.println(str1);String str2 = new String(byte4,"utf-16be");//用对应编码编码System.out.println(str2);}/* * 总结：gbk编码中文两个字节，英文一个； * utf-8编码中文三个字节，英文一个； * utf-16be中英文都是两个字节； * 当你字节序列是某种编码时，想要将其变成字符串也必须用这种编码； */}

看以上注释，不用多解释了。

文件内容编码转换

public class IOCVUtils {      /** 源文件编码 */      public static String sourceEncoding = "GBK";      /** 目标编码 */      public static String targetEncoding = "UTF-8";        /**       * 文件内容转编码       * @param sourceFile       * @param targetFile       * @throws UnsupportedEncodingException       * @throws FileNotFoundException       * @throws IOException       */      public static void changeEncoding(File sourceFile, File targetFile)              throws UnsupportedEncodingException, FileNotFoundException,              IOException {          FileInputStream fin = null;          FileOutputStream fout = null;          FileChannel fcin = null;          FileChannel fcout = null;          if (sourceEncoding == null) {              IOCVUtils.sourceEncoding = System.getProperty("file.encoding");          }          try {              fin = new FileInputStream(sourceFile);              fout = new FileOutputStream(targetFile);              fcin = fin.getChannel();              fcout = fout.getChannel();              ByteBuffer buffer = ByteBuffer.allocateDirect(1024);              while (true) {                  buffer.clear();                  int r = fcin.read(buffer);                  if (r == -1) {                      break;                  }                  buffer.flip();                  fcout.write(ByteBuffer.wrap(Charset.forName(sourceEncoding).decode(buffer).toString().getBytes(targetEncoding)));              }          } finally {              if (fin != null) {                  fin.close();                  fin = null;              }              if (fcin != null) {                  fcin.close();                  fcin = null;              }              if (fout != null) {                  fout.close();                  fout = null;              }              if (fcout != null) {                  fcout.close();                  fcout = null;              }          }      }        /**       * 文件内容转编码       * @param sourceFile       * @param targetFile       * @throws UnsupportedEncodingException       * @throws FileNotFoundException       * @throws IOException       */      public static void changeEncoding(String sourceFile, String targetFile) throws UnsupportedEncodingException, FileNotFoundException, IOException{          File fl1 = new File(sourceFile);          File fo1 = new File(targetFile);          changeEncoding(fl1, fo1);      }        /**       * 文件内容转编码       * @param sourceFile       * @param targetFile       * @param sourceEncoding 源文件编码 默认源文件的系统存储编码 System.getProperty("file.encoding");       * @param targetEncoding 目标编码 默认utf-8       * @throws UnsupportedEncodingException       * @throws FileNotFoundException       * @throws IOException       */      public static void changeEncoding(String sourceFile, String targetFile,              String sourceEncoding, String targetEncoding) throws UnsupportedEncodingException, FileNotFoundException, IOException {          IOCVUtils.sourceEncoding = sourceEncoding;          IOCVUtils.targetEncoding = targetEncoding;          changeEncoding(sourceFile, targetFile);      }  }

0 0