Java追加文件内容的三种方法
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2022-05-28 19:32:58
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package com.bijian.test; 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(); } } } /** * 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", "111"); method2("d://text.txt", "222"); method3("d://text.txt", "333"); }catch(Exception e){ System.out.println(e); } } }
运行结束后,打开D盘下的test.txt文件,内容如下所示:
文章来源:http://blog.csdn.net/malik76/article/details/6408726/