java中，对文件进行追加内容操作的三种方法
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import java.io.BufferedWriter;import java.io.FileOutputStream;import java.io.FileWriter;import java.io.IOException;import java.io.OutputStreamWriter;import java.io.PrintWriter;import java.io.RandomAccessFile;//如果文件存在，则追加内容；如果文件不存在，则创建文件，追加内容的三种方法public class AppendContentToFile {@SuppressWarnings("static-access")public static void main(String[] args) {AppendContentToFile a = new AppendContentToFile();a.method1();a.method2("E:\dd.txt", "222222222222222");a.method3("E:\dd.txt", "33333333333");} |
方法1：
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public void method1() {FileWriter fw = null;try {//如果文件存在，则追加内容；如果文件不存在，则创建文件File f=new File("E:\dd.txt");fw = new FileWriter(f, true);} catch (IOException e) {e.printStackTrace();}PrintWriter pw = new PrintWriter(fw);pw.println("追加内容");pw.flush();try {fw.flush();pw.close();fw.close();} catch (IOException e) {e.printStackTrace();}} |
方法2：
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public static void method2(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();}}} |
方法3：
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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();}}} |