转换流与标准的输入输出流

转换流的作用

 

TestOtherStream

package com.aff.file;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import org.junit.Test;

//转换流InputStreamReader  OutputStreamWriter
//    编码：字符串--->字节数组
//    解码：字节数组--->字符串

public class TestOtherStream {

    @Test
    public void test1() {
        BufferedReader br = null;
        BufferedWriter bw = null;

        try {
            // 解码
            File file1 = new File("jdbc.properties");
            FileInputStream fis = new FileInputStream(file1);
            InputStreamReader isr = new InputStreamReader(fis, "utf-8");
            br = new BufferedReader(isr);

            // 编码
            File file2 = new File("jdbc6.properties");
            FileOutputStream fos = new FileOutputStream(file2);
            OutputStreamWriter osw = new OutputStreamWriter(fos, "utf-8");
            bw = new BufferedWriter(osw);

            String str;
            while ((str = br.readLine()) != null) {
                bw.write(str);
                bw.newLine();
                bw.flush();
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (bw != null) {
                try {
                    bw.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (br != null) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }



// 标准的输入输出流
//    练习：从键盘输入字符流，要求将读取到的整字符串转成大写输出，
//    然后继续进行输入操作，直至当输入e或者exit时，退出程序
    @Test
    public void test2() {
        BufferedReader br = null;
        /*
         * 标准的输入输出流： 标准的输入流：
         * System.in 标准的输出流：System.out
         */
        try {
            InputStream is = System.in;// 字节流
            InputStreamReader isr = new InputStreamReader(is);// 字节流转换为字符流
            br = new BufferedReader(isr);// 在字符流外面包一层缓冲流
            String str;
            while (true) {
                System.out.println("输入字符串");
                str = br.readLine();
                if (str.equalsIgnoreCase("e") || str.equalsIgnoreCase("exit")) {
                    break;
                }
                String str1 = str.toUpperCase();
                System.out.println(str1);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (br != null) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}