使用Java如何实现追加文件内容

import Java.io.BufferedWriter; 
import java.io.File; 
import java.io.FileOutputStream; 
import java.io.FileWriter; 
import java.io.IOException; 
import java.io.OutputStreamWriter; 
import java.io.RandomAccessFile; 
 
/** 
 * 
 * @author malik 
 * @version 2011-3-10 下午10:49:41 
 */ 
public class AppendFile { 
   
  public static void method1(String file, String conent) {   
    BufferedWriter out = null;   
    try {   
      out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file, true)));   
      out.write(conent);   
    } catch (Exception e) {   
      e.printStackTrace();   
    } finally {   
      try {   
        if(out != null){ 
          out.close();   
        } 
      } catch (IOException e) {   
        e.printStackTrace();   
      }   
    }   
  }   
  
  /**  
   * 追加文件：使用FileWriter  
   *  
   * @param fileName  
   * @param content  
   */  
  public static void method2(String fileName, String content) {  
    FileWriter writer = null; 
    try {   
      // 打开一个写文件器，构造函数中的第二个参数true表示以追加形式写文件   
      writer = new FileWriter(fileName, true);   
      writer.write(content);    
    } catch (IOException e) {   
      e.printStackTrace();   
    } finally {   
      try {   
        if(writer != null){ 
          writer.close();   
        } 
      } catch (IOException e) {   
        e.printStackTrace();   
      }   
    }  
  }   
  
  /**  
   * 追加文件：使用RandomAccessFile  
   *  
   * @param fileName 文件名  
   * @param content 追加的内容  
   */  
  public static void method3(String fileName, String content) {  
    RandomAccessFile randomFile = null; 
    try {   
      // 打开一个随机访问文件流，按读写方式   
      randomFile = new RandomAccessFile(fileName, "rw");   
      // 文件长度，字节数   
      long fileLength = randomFile.length();   
      // 将写文件指针移到文件尾。   
      randomFile.seek(fileLength);   
      randomFile.writeBytes(content);   
    } catch (IOException e) {   
      e.printStackTrace();   
    } finally{ 
      if(randomFile != null){ 
        try { 
          randomFile.close(); 
        } catch (IOException e) { 
          e.printStackTrace(); 
        } 
      } 
    } 
  }  
 
  public static void main(String[] args) { 
    try{ 
      File file = new File("d://text.txt"); 
      if(file.createNewFile()){ 
        System.out.println("Create file successed"); 
      } 
      method1("d://text.txt", "123"); 
      method2("d://text.txt", "123"); 
      method3("d://text.txt", "123"); 
    }catch(Exception e){ 
      System.out.println(e); 
    } 
  } 
}