java utf-8文件的读取

private void myRead() {
// TODO Auto-generated method stub
try { 
       FileInputStream fis = new FileInputStream("f:\\UserInfo.xml"); 
//        InputStreamReader isr = new InputStreamReader(fis, "UTF-8"); 
       BufferedReader br = new BufferedReader(new UnicodeReader(fis,
        Charset.defaultCharset().name())); 
       String line = null; 
       while ((line = br.readLine()) != null) { 
           FileContent += line; 
           FileContent += "\r\n"; // 补上换行符 
           System.out.println(line);
       } 
   } catch (Exception e) { 
       e.printStackTrace(); 
   }

}

要用到的工具类 这样才无乱码

import java.io.*;


/**
 * Generic unicode textreader, which will use BOM mark
 * to identify the encoding to be used. If BOM is not found
 * then use a given default or system encoding.
 */
public class UnicodeReader extends Reader {
   PushbackInputStream internalIn;
   InputStreamReader   internalIn2 = null;
   String              defaultEnc;


   private static final int BOM_SIZE = 4;


   /**
    *
    * @param in  inputstream to be read
    * @param defaultEnc default encoding if stream does not have 
    *                   BOM marker. Give NULL to use system-level default.
    */
   UnicodeReader(InputStream in, String defaultEnc) {
      internalIn = new PushbackInputStream(in, BOM_SIZE);
      this.defaultEnc = defaultEnc;
   }


   public String getDefaultEncoding() {
      return defaultEnc;
   }


   /**
    * Get stream encoding or NULL if stream is uninitialized.
    * Call init() or read() method to initialize it.
    */
   public String getEncoding() {
      if (internalIn2 == null) return null;
      return internalIn2.getEncoding();
   }


   /**
    * Read-ahead four bytes and check for BOM marks. Extra bytes are
    * unread back to the stream, only BOM bytes are skipped.
    */
   protected void init() throws IOException {
      if (internalIn2 != null) return;


      String encoding;
      byte bom[] = new byte[BOM_SIZE];
      int n, unread;
      n = internalIn.read(bom, 0, bom.length);


      if ( (bom[0] == (byte)0x00) && (bom[1] == (byte)0x00) &&
                  (bom[2] == (byte)0xFE) && (bom[3] == (byte)0xFF) ) {
         encoding = "UTF-32BE";
         unread = n - 4;
      } else if ( (bom[0] == (byte)0xFF) && (bom[1] == (byte)0xFE) &&
                  (bom[2] == (byte)0x00) && (bom[3] == (byte)0x00) ) {
         encoding = "UTF-32LE";
         unread = n - 4;
      } else if (  (bom[0] == (byte)0xEF) && (bom[1] == (byte)0xBB) &&
            (bom[2] == (byte)0xBF) ) {
         encoding = "UTF-8";
         unread = n - 3;
      } else if ( (bom[0] == (byte)0xFE) && (bom[1] == (byte)0xFF) ) {
         encoding = "UTF-16BE";
         unread = n - 2;
      } else if ( (bom[0] == (byte)0xFF) && (bom[1] == (byte)0xFE) ) {
         encoding = "UTF-16LE";
         unread = n - 2;
      } else {
         // Unicode BOM mark not found, unread all bytes
         encoding = defaultEnc;
         unread = n;
      }    
      //System.out.println("read=" + n + ", unread=" + unread);


      if (unread > 0) internalIn.unread(bom, (n - unread), unread);


      // Use given encoding
      if (encoding == null) {
         internalIn2 = new InputStreamReader(internalIn);
      } else {
         internalIn2 = new InputStreamReader(internalIn, encoding);
      }
   }


   public void close() throws IOException {
      init();
      internalIn2.close();
   }


   public int read(char[] cbuf, int off, int len) throws IOException {
      init();
      return internalIn2.read(cbuf, off, len);
   }


}