java|java FileWriter 追加文件及文件改名方式 javaFileWriter追加文件及文件改名

FileWriter 追加文件及文件改名我就废话不多说了，大家还是直接看代码吧~

import java.io.File; import java.io.FileWriter; import java.io.IOException; public class FileWriterUtil {/*** 追加文件：使用FileWriter*/public static void appendMethod(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(); }}/*** 修改文件名* @param oldFilePath* @param newFileName*/public static void reNameLogFile(String oldFilePath,String newFileName){File f=new File(oldFilePath); String c=f.getParent(); //File mm=new File(c + File.pathSeparator + newFileName + "_" + CommonUtil.getCurrTimeForString()); File mm=new File(c + "/" + newFileName + "_" + CommonUtil.getBeforeDateStr()); if(f.renameTo(mm)){System.out.println("修改文件名成功!"); }else{System.out.println("修改文件名失败"); }}public static void main(String[] args) {String fileName = "/Users/qin/Downloads/callLog.txt"; String content = "new append!"; FileWriterUtil.appendMethod(fileName, content); FileWriterUtil.appendMethod(fileName, "append end. \n"); FileWriterUtil.reNameLogFile("/Users/qin/Downloads/callLog.txt","rayda"); }}

Java PrintWriter&FileWriter 写入追加到文件用PrintWriter写入文件

import java.io.IOException; import java.io.PrintWriter; public class PrintWriteDemo{public static void main(String[] args) throws IOException{PrintWriter out = new PrintWriter("01.txt"); out.print("the quick brown fox"); out.println(" jumps over the lazy dog."); out.write("work is like a capricious lover whose "); out.write("incessant demands are resented but who is missed terribly when she is not there\n"); out.close(); //如果不关闭文件，文件停留在buffer zone, 不会写进"01.txt"中}}

FileWriter只能写入文件，无法往文件中追加内容
用FileWriter写入和追加文件

import java.io.IOException; import java.io.FileWriter; public class FileWriterDemo{public static void main(String[] args) throws IOException{FileWriter out = new FileWriter("02.txt"); //constructor中添加true,即FileWriter out = new FileWriter("02.txt", true)就是往02.txt中追加文件了out.write("work is like a capricious lover whose "); out.write("incessant demands are resented but who is missed terribly when she is not there\n"); out.write(98.7 + "\n"); out.close(); //很重要，一定记得关闭文件}}

都别忘记 throws IOException
【java|java FileWriter 追加文件及文件改名方式】以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。