java中替换文件内容

package jbit.io;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
public class ReaderAndWriterFile {
   public void replaceFile(String file1,String file2) {   
       BufferedReader reader = null;
           BufferedWriter writer = null;
     try {
      //创建 FileReader对象和FileWriter对象.
      FileReader fr  = new FileReader(file1);  
      FileWriter fw = new FileWriter(file2);
            //创建 输入、输入出流对象.
            reader = new BufferedReader(fr);
            writer = new BufferedWriter(fw);
            String line = null;
            StringBuffer sbf=new StringBuffer();  
            //循环读取并追加字符
            while ((line = reader.readLine()) != null) {
                sbf.append(line);  
            }
            System.out.println("替换前："+sbf);
            /*替换内容*/
            String newString=sbf.toString().replace("{name}", "欧欧");
            newString = newString.replace("{type}", "狗狗");
            newString = newString.replace("{master}", "李伟");
            System.out.println("替换后："+newString);
            writer.write(newString);  //写入文件       
        } catch (IOException e) {
            e.printStackTrace();
        }finally{
          //关闭 reader 和 writer.
      try {
        if(reader!=null)
          reader.close();
        if(writer!=null)
          writer.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }
  public static void main(String[] args) {
    ReaderAndWriterFile obj = new ReaderAndWriterFile();
        obj.replaceFile("c:\\pet.template", "D:\\myDoc\\pet.txt");          
  }
}