利用java怎么在文件的末尾追加内容

import java.io.BufferedWriter;import java.io.FileOutputStream;import java.io.FileWriter;import java.io.IOException;import java.io.OutputStreamWriter;import java.io.RandomAccessFile;public class WriteStreamAppend {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 {        out.close();      } catch (IOException e) {        e.printStackTrace();      }    }}public static void method2(String fileName, String content) {    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      FileWriter writer = new FileWriter(fileName, true);      writer.write(content);      writer.close();    } catch (IOException e) {      e.printStackTrace();    }}public static void method3(String fileName, String content) {    try {      // 打开一个随机访问文件流，按读写方式      RandomAccessFile 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);      randomFile.close();    } catch (IOException e) {      e.printStackTrace();    }}public static void main(String[] args) {    System.out.println("start");    method1("c:/test.txt", "追加到文件的末尾");    System.out.println("end");}