JAVA 创建TXT文件，写入文件内容，读取文件内容

爱被打了一巴掌 2022-01-14 11:41 548阅读 0赞

[2019独角兽企业重金招聘Python工程师标准>>> ][2019_Python_] ![hot3.png][]

package com.abin.facade.ws.mail.function;

import java.io.BufferedReader;  
import java.io.File;  
import java.io.FileOutputStream;  
import java.io.FileReader;  
import java.io.RandomAccessFile;

public class FileOperation \{  
  
/\*\*  
\* 创建文件  
\* [@param][param] fileName  
\* [@return][return]  
\*/  
public static boolean createFile(File fileName)throws Exception\{  
boolean flag=false;  
try\{  
if(!fileName.exists())\{  
fileName.createNewFile();  
flag=true;  
\}  
\}catch(Exception e)\{  
e.printStackTrace();  
\}  
return true;  
\}  
  
/\*\*  
\* 读TXT文件内容  
\* [@param][param] fileName  
\* [@return][return]  
\*/  
public static String readTxtFile(File fileName)throws Exception\{  
String result=null;  
FileReader fileReader=null;  
BufferedReader bufferedReader=null;  
try\{  
fileReader=new FileReader(fileName);  
bufferedReader=new BufferedReader(fileReader);  
try\{  
String read=null;  
while((read=bufferedReader.readLine())!=null)\{  
result=result+read+"\\r\\n";  
\}  
\}catch(Exception e)\{  
e.printStackTrace();  
\}  
\}catch(Exception e)\{  
e.printStackTrace();  
\}finally\{  
if(bufferedReader!=null)\{  
bufferedReader.close();  
\}  
if(fileReader!=null)\{  
fileReader.close();  
\}  
\}  
System.out.println("读取出来的文件内容是："+"\\r\\n"+result);  
return result;  
\}  
  
  
public static boolean writeTxtFile(String content,File fileName)throws Exception\{  
RandomAccessFile mm=null;  
boolean flag=false;  
FileOutputStream o=null;  
try \{  
o = new FileOutputStream(fileName);  
o.write(content.getBytes("GBK"));  
o.close();  
// mm=new RandomAccessFile(fileName,"rw");  
// mm.writeBytes(content);  
flag=true;  
\} catch (Exception e) \{  
// TODO: handle exception  
e.printStackTrace();  
\}finally\{  
if(mm!=null)\{  
mm.close();  
\}  
\}  
return flag;  
\}

public static void contentToTxt(String filePath, String content) \{  
String str = new String(); //原有txt内容  
String s1 = new String();//内容更新  
try \{  
File f = new File(filePath);  
if (f.exists()) \{  
System.out.print("文件存在");  
\} else \{  
System.out.print("文件不存在");  
f.createNewFile();// 不存在则创建  
\}  
BufferedReader input = new BufferedReader(new FileReader(f));

while ((str = input.readLine()) != null) \{  
s1 += str + "\\n";  
\}  
System.out.println(s1);  
input.close();  
s1 += content;

BufferedWriter output = new BufferedWriter(new FileWriter(f));  
output.write(s1);  
output.close();  
\} catch (Exception e) \{  
e.printStackTrace();

\}  
\}

转自：[http://blog.csdn.net/suplxj/article/details/7581715][http_blog.csdn.net_suplxj_article_details_7581715]

转载于:https://my.oschina.net/secyaher/blog/274430

[2019_Python_]: https://my.oschina.net/u/2663968/blog/3061697
[hot3.png]: /images/20220114/6e17f64fb1874de09835b07f40f470c7.png
[param]: http://my.oschina.net/param
[return]: http://my.oschina.net/u/556800
[http_blog.csdn.net_suplxj_article_details_7581715]: http://blog.csdn.net/suplxj/article/details/7581715