PrintStream和PrintWriter
- PrintStream
package com.io.printstream; import java.io.IOException; import java.io.PrintStream; import java.nio.charset.StandardCharsets; /** * 演示 PrintStream(字节打印流/输出流) */ public class PrintStream_ { public static void main(String[] args) throws IOException { PrintStream out=System.out; //在默认情况下,PrintStream输出数据的位置是标准输出,即显示器 out.println("cyy,hello"); //因为print底层使用的是write,所以我们也可以直接调用write进行打印/输出 out.write("cyy,hello".getBytes()); out.close(); //我们可以去修改打印流输出的位置/设备 //"hello,沐晴~"是输出到d:\f1.txt中 System.setOut(new PrintStream("d:\\f1.txt")); System.out.println("hello,沐晴~"); } }
- PrintWriter
package com.io.printstream; import java.io.FileWriter; import java.io.IOException; import java.io.PrintWriter; public class PrintWriter_ { public static void main(String[] args) throws IOException { //写入到指定的文件中 PrintWriter printWriter = new PrintWriter(new FileWriter("d:\\f2.txt")); printWriter.print("hi,北京!"); printWriter.close(); } }