java中八种IO操作

java中八种IO操作

package com.mengya.TestIO;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.BufferedOutputStream;
import java.io.FileWriter;
import java.io.FileReader;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.OutputStreamWriter;
import java.io.InputStreamReader;

public class TestIO {

 /**
  * Java中的8种IO操作
  */
 /*
  * 创建文件
  */
 public void CreateFile(){
  File f=new File("e:\\io.txt");
  if(!f.exists()){
   try {
    f.createNewFile();
   } catch (IOException e) {
    e.printStackTrace();
   }
  }
 }
 /*
  * FileOutputStream字节流式的写
  */
 public void set1(){
  try {
   FileOutputStream f=new FileOutputStream("e:\\io.txt");
   String str="我的未来不是梦";
   byte[] b=str.getBytes();
   try {
    f.write(b);
    f.flush();
    f.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  }  
 }
 /*
  * FileInputStream字节流式的读
  */
 public void get1(){
  try {
   FileInputStream f=new FileInputStream("e:\\io.txt");
   byte[] b=new byte[200];
   try {
    int n=f.read(b);
    String str=new String(b,0,n);
    System.out.println(str);
   } catch (IOException e) {
    e.printStackTrace();
   }
   
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  }  
 }
 /*
  *
  */
 public void set2(){
  try {
   FileOutputStream f=new FileOutputStream("e:\\io.txt",true);//如果没true则复盖原来的文件，加了true则添加原文件后面
   BufferedOutputStream ff=new BufferedOutputStream(f);
   String str=new String("我的心跟着希望在动");
   try {
    ff.write(str.getBytes());
    ff.flush();
    ff.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  }
  
 }
 
 public void get2(){
  try {
   FileInputStream f=new FileInputStream("e:\\io.txt");
   BufferedInputStream ff=new BufferedInputStream(f);
   byte[] b=new byte[200];
   try {
    int n = ff.read(b);
    String str=new String(b,0,n);
    System.out.println(str);
   } catch (IOException e) {
    e.printStackTrace();
   }
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  }
 }
 
 /*
  * 字符流
  */
 public void set3(){
  try {
   FileWriter f=new FileWriter("e:\\io.txt",true);
   f.write("\r\n我在佛前苦苦求了几千前");//\r\n表示换行
   f.flush();
   f.close();
  } catch (IOException e) {
   e.printStackTrace();
  }
 }
 public void get3(){
  try {
   FileReader f=new FileReader("e:\\io.txt");
   char[] c=new char[200];
   try {
    int n = f.read(c);
    String str=new String(c,0,n);
    System.out.println(str);
   } catch (IOException e) {
    e.printStackTrace();
   }
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  }
 }
 public void set4(){
  try {
   FileWriter f=new FileWriter("e:\\io.txt",true);
   BufferedWriter ff=new BufferedWriter(f);
   ff.write("希望能感动上天");
   ff.flush();
   ff.close();
  } catch (IOException e) {
   e.printStackTrace();
  }
  
 }
 public void get4(){
  try {
   FileReader f=new FileReader("e:\\io.txt");
   BufferedReader ff=new BufferedReader(f);
   char[] c=new char[200];
   int n;
   try {
    n = ff.read(c);
    String str=new String(c,0,n);
    System.out.println(str);
    ff.close();
    f.close();
   } catch (IOException e) {
    e.printStackTrace();
   }   
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  }
  
 }
 /*
  * 将字节流转化为字符流
  */
 public void h1(){
  try {
   FileOutputStream f=new FileOutputStream("e:\\io.txt",true);
   OutputStreamWriter ff=new OutputStreamWriter(f);
   try {
    ff.write("\r\n希望你能够出现在我面前");
    ff.flush();
    ff.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  }
 }
 public void h2(){
  try {
   FileInputStream f=new FileInputStream("e:\\io.txt");
   InputStreamReader ff=new InputStreamReader(f);
   char[] c=new char[200];
   int n;
   try {
    n = ff.read(c);
    String str=new String(c,0,n);
    System.out.println(str);
    ff.close();
    f.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  }
 }
 /*
  * 比较好的读的方式
  */
 public void hh(){
  try {
   FileReader f=new FileReader("e:\\io.txt");
   BufferedReader ff=new BufferedReader(f);
   while(ff.ready()){
    System.out.println(ff.readLine());
   }
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
 public static void main(String[] args) {
  TestIO test=new TestIO();
  test.CreateFile();
  //test.set1();
  //test.get1();
  //test.set2();
  //test.get2();
  //test.set3();
  //test.get3();
  //test.set4();
  //test.get4();
  //test.h1();
  //test.h2();
  test.hh();
 }

}