Java文件操作：按行读取和写入

文件操作是任何语言中最为常用的部分，Java也不例外。这里主要介绍按行读取的文件操作和写入

 

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

 

 

public class JavaFile {

      public static void main(String[] args) {

            try {

            // read file content from file

            StringBuffer sb= new StringBuffer("");

           

            FileReader reader = new FileReader("c://test.txt");

            BufferedReader br = new BufferedReader(reader);

           

            String str = null;

           

            while((str = br.readLine()) != null) {

                  sb.append(str+"/n");

                 

                  System.out.println(str);

            }

           

            br.close();

            reader.close();

           

            // write string to file

            FileWriter writer = new FileWriter("c://test2.txt");

            BufferedWriter bw = new BufferedWriter(writer);

            bw.write(sb.toString());

           

            bw.close();

            writer.close();

      }

      catch(FileNotFoundException e) {

                  e.printStackTrace();

            }

            catch(IOException e) {

                  e.printStackTrace();

            }

      }

 

}