Java基础之转换流的编码和解码

迷南。 2022-12-19 00:58 224阅读 0赞

package cn.itcast.io.p1.transstream.demo;
    
    import java.io.FileInputStream;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    import java.io.FileReader;
    import java.io.FileWriter;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.io.OutputStreamWriter;
    import java.io.UnsupportedEncodingException;
    
    public class TransStreamDemo3 {
        
    
    	/**
    	 * @param args
    	 * @throws IOException 
    	 */
    	public static void main(String[] args) throws IOException {
        
    
    		readText_2();
    	}
    
    	public static void readText_2() throws IOException, FileNotFoundException {
        
    		
    		
    		InputStreamReader isr = new InputStreamReader(new FileInputStream("gbk_1.txt"),"utf-8");
    		char[] buf = new char[10];
    		int len = isr.read(buf);
    		String str = new String(buf,0,len);
    		System.out.println(str);
    		
    		isr.close();
    	}
    
    	public static void readText_1() throws IOException {
        
    		
    		FileReader fr = new FileReader("gbk_1.txt");
    		
    		char[] buf = new char[10];
    		int len = fr.read(buf);
    		String str = new String(buf,0,len);
    		System.out.println(str);
    		
    		fr.close();
    		
    		
    	}
    
    	public static void writeText_3() throws IOException {
        
    		
    		OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("u8_1.txt"),"UTF-8");
    		
    		osw.write("你好");
    		osw.close();
    		
    	}
    
    	public static void writeText_2() throws IOException {
        
    		
    		OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("gbk_3.txt"),"GBK");
    		
    //		OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("gbk_3.txt"),"GBK");
    //		FileWriter fw = new FileWriter("gbk_1.txt");
    		
    		/*
    		 * 这两句代码的功能是等同的。 
    		 * FileWriter：其实就是转换流指定了本机默认码表的体现。而且这个转换流的子类对象，可以方便操作文本文件。
    		 *             简单说：操作文件的字节流+本机默认的编码表。
    		 * 				这是按照默认码表来操作文件的便捷类。
    		 * 
    		 * 如果操作文本文件需要明确具体的编码。FileWriter就不行了。必须用转换流。 
    		 * 
    		 */
    		
    		
    		osw.write("你好");
    		
    		osw.close();
    		
    		
    	}
    
    	public static void writeText_1() throws IOException {
        
    		
    		FileWriter fw = new FileWriter("gbk_1.txt");
    		
    		fw.write("你好");
    		
    		fw.close();
    	}
    
    }

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