Java IO流总结（2）

ゞ浴缸里的玫瑰 2022-08-21 07:57 167阅读 0赞

package com.test.io;
    
    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;
    
    
    public class ChangeStream {
    	
    	/**
    	 * 标准输入输出流  System.out
    	 * 标准输入流 System.in
    	 */
    	@Test
    	public void test2(){
    		//字节流转换为了字符流
    		InputStream is = System.in;
    		InputStreamReader isr =  new InputStreamReader(is);
    		BufferedReader br = new BufferedReader(isr);
    		System.out.println("请输入：");
    		String str;
    		while(true){
    			try {
    				str = br.readLine();
    				if(str.equalsIgnoreCase("e")||str.equalsIgnoreCase("exit")){
    					break;
    				}
    				//toUpperCase转为大写
    				String s = str.toUpperCase();
    				System.out.println(s);
    			} catch (IOException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    			//equalsIgnoreCase忽略大小写
    		}
    		try {
    			br.close();
    		} catch (IOException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    	}
    	
    	/**
    	 * 转换流
    	 * InputStreamReader 和OutputStramWriter
    	 * 编码：字符串转为字节数组OutputStreamWriter
    	 * 解码：字节数组转为字符串InputStreamReader
    	 * @author mxr
    	 *
    	 */
    	@Test
    	public void test(){
    		BufferedReader br = null;
    		BufferedWriter bw = null;
    		try {
    			File file = new File("H:/javatext/aa.txt");
    			FileInputStream fis = new FileInputStream(file);
    			//返回的是Reader
    			InputStreamReader isr = 
    					new InputStreamReader(fis,"UTF-8");
    			br = new BufferedReader(isr);
    			File file1 = new File("H:/javatext/ds.txt");
    			FileOutputStream fos = new FileOutputStream(file1);
    			OutputStreamWriter osw = 
    					new OutputStreamWriter(fos,"UTF-8");
    			bw = new BufferedWriter(osw);
    			String str=null;
    			while((str = br.readLine())!=null){
    				bw.write(str);
    				bw.newLine();
    				bw.flush();
    			}
    		} catch (IOException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}finally{
    			try {
    				bw.close();
    				br.close();
    			} catch (IOException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    		}
    		
    		
    	}
    }