FileWriter 追加文件及文件改名
我就廢話不多說了，大家還是直接看代碼吧~
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
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 { //打開一個寫文件器，構造函數中的第二個參數true表示以追加形式寫文件 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("修改文件名失敗"); } } 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 寫入追加到文件
用PrintWriter寫入文件
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
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(); //如果不關閉文件，文件停留在buffer zone, 不會寫進"01.txt"中 }} |
FileWriter只能寫入文件，無法往文件中追加內容
用FileWriter寫入和追加文件
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
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，一定記得關閉文件 }} |
都別忘記 throws IOException
以上為個人經驗，希望能給大家一個參考，也希望大家多多支持服務器之家。
原文鏈接：https://blog.csdn.net/u014481096/article/details/53489364
