Java IO类操作Print与BufferedReader

PrintStream

PrintStream p = new PrintStream("F:\\1.txt"); p.println("嘿嘿"); p.close(); 

结果：

PrintWriter

PrintWriter p2 = new PrintWriter("F:\\1.txt"); p2.println("呵呵"); p2.flush(); p2.close(); 

结果

字符流转换为字节流

FileOutputStream fos = new FileOutputStream("f:\\1.txt"); PrintWriter pw = new PrintWriter(fos); pw.println("123456"); pw.flush(); pw.close(); 

结果：

BufferedReader

缓存读取流：将字符输入流 转为带有缓存 可以一次读取一行的缓存读取流

FileReader fr = new FileReader("F:\\1.txt"); BufferedReader br = new BufferedReader(fr); String test = br.readLine(); System.out.println(test); br.close(); 

结果：

注意：读到结尾会返回null

异常日志收集

package zuoye; import jdk.internal.org.objectweb.asm.tree.TryCatchBlockNode; import java.io.FileNotFoundException; import java.io.PrintWriter; import java.text.SimpleDateFormat; import java.util.Date; public class Demo12 { public static void main(String[] args) throws FileNotFoundException { //收集异常信息 try { String s = null; s.toString(); }catch (Exception e){ PrintWriter pw = new PrintWriter("c://bug.txt"); SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm"); pw.print(format.format(new Date())); e.printStackTrace(pw); pw.close(); } } } 

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