JAVA½«ÄÚÈÝ×·¼Óµ½Îļþβ²¿

import java.io.FileWriter;
import java.io.IOException;
import java.io.RandomAccessFile;
/**
 * ½«ÄÚÈÝ×·¼Óµ½Îļþβ²¿
 */
public class AppendToFile
{
    /**
     * A·½·¨×·¼ÓÎļþ£ºÊ¹ÓÃRandomAccessFile
     *
     * @param fileName
     *                ÎļþÃû
     * @param content
     *                ×·¼ÓµÄÄÚÈÝ
     */
    public static void appendMethodA(String fileName, String content)
    {
 try
 {
     // ´ò¿ªÒ»¸öËæ»ú·ÃÎÊÎļþÁ÷£¬°´¶Áд·½Ê½
     RandomAccessFile randomFile = new RandomAccessFile(fileName, "rw");
     // Îļþ³¤¶È£¬×Ö½ÚÊý
     long fileLength = randomFile.length();
     // ½«Ð´ÎļþÖ¸ÕëÒƵ½Îļþβ¡£
     randomFile.seek(fileLength);
     randomFile.writeBytes(content);
     randomFile.close();
 }
 catch (IOException e)
 {
     e.printStackTrace();
 }
    }
    /**
     * B·½·¨×·¼ÓÎļþ£ºÊ¹ÓÃFileWriter
     *
     * @param fileName
     * @param content
     */
    public static void appendMethodB(String fileName, String content)
    {
 try
 {
     // ´ò¿ªÒ»¸öдÎļþÆ÷£¬¹¹Ô캯ÊýÖеĵڶþ¸ö²ÎÊýtrue±íʾÒÔ×·¼ÓÐÎʽдÎļþ
     FileWriter writer = new FileWriter(fileName, true);
     writer.write(content);
     writer.clos