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~
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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
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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
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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
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服务器之家。
原文链接：https://blog.csdn.net/u014481096/article/details/53489364
