IO基本操作

ゝ一世哀愁。 2022-05-25 06:58 182阅读 0赞

package test;
    
    import java.io.*;
    
    public class IOTest2 {
    
    	static String path1 = "src/test/a.txt";
    	static String path2 = "src/test/b.txt";
    
    	public static void main(String[] args) {
    		//字节流	
    		readFile1();
    		//字符流
    		readFile2();
    		//字节流缓存流
    		readFile3();
    		//字符缓存流
    		readFile4();
    	
    		//字节流
    		writeFile1();              
    		//字符流
    		writeFile2();
    		//字节缓存流
    		writeFile3();
    		//字符缓存流
    		writeFile4();
    	}
    	private static void writeFile4() {
    		File file = new File(path2);
    		Writer writer = null;
    		BufferedWriter bw = null;
    		try {
    			writer = new FileWriter(file);
    			bw = new BufferedWriter(writer);
    			String str = "骄傲后来开始放假啊包括了是吧";
    			bw.write(str);
    			
    		}//抛异常+关闭
    		
    	}
    	private static void readFile4() {
    		File file = new File(path1);
    		Reader reader = null;
    		BufferedReader br = null;
    		try {
    			reader = new FileReader(file);
    			br = new BufferedReader(reader);
    			String str = null;
    			while((str = br.readLine()) != null) {
    				System.out.println(str);
    			}
    			
    		} //抛异常+关闭
    	}
    	private static void readFile1() {
    
    		File file = new File(path1);
    		InputStream is = null;
    		try {
    			is = new FileInputStream(file);
    			byte [] bytes = new byte [1000];
    	   		is.read(bytes);
    			String str = new String (bytes);
    			System.out.println(str);
    		}//抛异常+关闭
    	}	
    			
    	private static void writeFile3() {
    		File file = new File(path2);
    		OutputStream os = null;
    		BufferedOutputStream bos= null;
    		try {
    			os = new FileOutputStream(file);
    			bos = new BufferedOutputStream(os);
    			String str = "sadfalhnsdf;klasdhnf";
    			bos.write(str.getBytes());
    		} //抛异常+关闭
    	}
    
    	private static void readFile3() {
    		
    		File file = new File(path1);
    		InputStream is = null;
    		BufferedInputStream bis= null;
    		try {
    			is = new FileInputStream(file);
    			bis = new BufferedInputStream(is);
    			byte [] bytes = new byte [1000];
    			bis.read(bytes);
    			String str = new String (bytes);
    			System.out.println(str);
    		}//抛异常+关闭
    	}
    
    	private static void writeFile2() {
    		File file = new File(path2);
    		Writer writer = null;
    		try {
    			writer = new FileWriter(file);
    			writer.write("aoifjaopfhaowuihaiwpfhaoi");
    		} //抛异常+关闭
    	}
    
    	private static void writeFile1() {
    		File file = new File(path2);
    		OutputStream os = null;
    		try {
    			os = new FileOutputStream(file);
    			String str = "sadfalhnsdf;klasdhnf";
    			os.write(str.getBytes());
    		}//抛异常+关闭
    	}
    
    	private static void readFile2() {
    		File file = new File(path1);
    		Reader reader = null;
    		try {
    			reader = new FileReader(file);
    			int i = -1;
    			while( (i = reader.read())!= -1) {
    				System.out.print((char)i);
    			}
    			
    		} //抛异常+关闭
    }
    }

byte->String :  String str = new String (bytes)

String->byte:   str.getBytes();

![20180509213449133][]

[20180509213449133]: /images/20220525/254b6dcb26434f9eabbd6bda7b37a1dc.png