bufferedReader

BufferedReader类

gkb就是ANSI

BufferedReader 类是Reader 类的子类
BufferedReader 类带有缓冲区
按行读取内容的readLine()方法
BufferedReader 常用的构造方法
BufferedReader(Reader in)
子类BufferedReader 特有的方法
readLine()读取字符串 返回字符串String
read()读取字符

引入相关的类

import java.io.FileReader;

import java.io.BufferedReader;

import java.io.IOException;
构造BufferedReader对象和FileReader对象 Reader fr = new FileReader("C:\\myTest.txt ");
BufferedReader br=new BufferedReader(fr);
调用readLine()方法读取数据
br.readLine();
关闭文件流对象
br.close();

fr.close()

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;


public class FileReaderDemo {
public static void main(String[] args) {
FileReader fr = null;
BufferedReader br = null;
try {
fr = new FileReader("D:/liangsong/hello.txt");
br = new BufferedReader(fr);
String line = null;
  while((line = br.readLine() ) != null){
  System.out.println(line);
  }
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
fr.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}

public class BufferedReaderDemo {
	public static void main(String[] args) {
		InputStream is = null;
		Reader read = null;
		BufferedReader br = null;
		Writer fw = null;
		BufferedWriter bw = null;
		try {
			is = new FileInputStream("D:/liangsong/animal.template");
			read = new InputStreamReader(is,"utf-8");
			br = new BufferedReader(read);
			
			fw = new FileWriter("D:/liangsong/hello.txt");
			bw = new BufferedWriter(fw);
			StringBuffer sb = new StringBuffer();
			String line = null;
			while((line=br.readLine()) != null){
				sb.append(line);
			}
			System.out.println("替换前："+sb);
			String str = sb.toString().replace("{name}","若曦").replace("{type}","泰迪").replace("{country}","USA");
			System.out.println("替换后："+str);
			bw.write(str);
			bw.flush();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally{
			try {
				bw.close();
				fw.close();
				br.close();
				read.close();
				is.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
}