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标题: JAVA 创建TXT文件，写入文件内容，读取文件内容 [打印本页]

作者: jekeyhui99 时间: 2015-11-30 16:09
标题: JAVA 创建TXT文件，写入文件内容，读取文件内容
[java] view plaincopy
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 fileName
  * @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 fileName
  * @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();

      }
}

}

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