BufferedWriter与BufferedRead --------------------------Test

 package com.test;

 import java.io.BufferedReader;
 import java.io.BufferedWriter;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.FileReader;
 import java.io.FileWriter;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.ArrayList;
 import java.util.List;
 /**
  * 将文档中每一行的男转为女，需要注意要读取的文件的编码格式与java文件的编码格式相同
  * @author Administrator
  *
  */
 public class Demo2 {

     public static void main(String[] args) {
         // TODO Auto-generated method stub

         Read read = new Read();
         read.readWrite();
     }

 }

 class Read {
     public static void readWrite() {

         BufferedReader bufferedReader = null;
         BufferedWriter bufferedWriter = null;
         try {
             //找到要进行转换的文件
             File file = new File("D://userMsg//userinfo.txt");
             //建立读取数据通道
             FileReader fileReader = new FileReader(file);
             bufferedReader = new BufferedReader(fileReader);
             String str = null;
             //保存读取道德内容   输入流
             List<String> list = new ArrayList<String>();
             while ((str = bufferedReader.readLine()) != null) {
                 //进行男女转换
                 System.out.println(str);
                 String s = str.replaceAll("男", "女");
                 list.add(s);
             }
             //建立写入数据通道     输出流
             FileWriter fileWriter = new FileWriter(file);
             bufferedWriter = new BufferedWriter(fileWriter);
             //遍历集合
             for (String s : list) {
                 bufferedWriter.write(s);
                 System.out.println(s);
             }
             //流冲刷，如果缺少，可能导致写入不成功
             bufferedWriter.flush();
         } catch (FileNotFoundException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         } finally {
             //关闭流
             if (bufferedWriter != null) {
                 try {
                     bufferedWriter.close();
                 } catch (IOException e) {
                     // TODO Auto-generated catch block
                     e.printStackTrace();
                 } finally {
                     if (bufferedReader != null) {
                         try {
                             bufferedReader.close();
                         } catch (IOException e) {
                             // TODO Auto-generated catch block
                             e.printStackTrace();
                         }
                     }
                 }
             }
         }

     }
 }