java 追加文件

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");
     }