Java IO流--字节字符转换流

 

转换流：可以将字节流转换成字符流，也可以将字符流转换成字节流。

InputStreamReader:将输入的字节流转换成字符流

OutputStreamWriter:将输出的字符流转换成字节流

 

代码示例：

 

package com.seven.javaSE;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.nio.charset.Charset;

public class ChangeStream {
    public static void main(String[] args) {
        InputStream in=null;
        try {
            in = new FileInputStream("c:/TestFile/hello.txt");
            read(in);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        
        try {
            OutputStream out = new FileOutputStream("C:/TestFile/target.txt");
            write(out);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }
    
    //输入字节流转成字符流
    public static void read(InputStream in) {
        Reader reader = new InputStreamReader(in,Charset.defaultCharset());
        StringBuilder sb = new StringBuilder();
        char [] content = new char[10];
        int len=-1;
        try {
            while((len=reader.read(content))!=-1) {
                sb.append(content,0,len);
            }
            reader.close();
            System.out.println(sb);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    //输出字符流转成字节流
    public static void write(OutputStream out) {
        Writer writer = new OutputStreamWriter(out,Charset.defaultCharset());
        try {
            writer.write("藤原豆腐渣渣学Java");
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println("写入文件成功");
    }
}