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;   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();         }       }     }           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();         }       }    }           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);     }   } }