package cn.xlucas.io;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.InetAddress;
import java.net.Socket;
public class IoDemo1 {
 public static void main(String[] args) throws IOException {
  //testInput();
  writeFile();
  readFile();
 }
 //將文件的內容讀取出來
 public static void readFile() throws IOException{
  //建立文件與程序的輸入數據通道
  FileInputStream filein=new FileInputStream("F:\\a.txt");
  //創建輸入字節流的轉換流并且指定碼表進行讀取
  InputStreamReader inputin=new InputStreamReader(filein,"utf-8");
  //FileReader filein =new FileReader("F:\\a.txt");//這種會出現亂碼的情況 
  int context=0;
  while((context=inputin.read())!=-1){
   System.out.print((char)context);
  }
  //關閉資源
  inputin.close();
  filein.close(); 
 }
 //將內容用utf-8的格式寫入文件中
 public static void writeFile() throws IOException{
  //建立了文件與程序的數據 通道
  FileOutputStream fileout=new FileOutputStream("F:\\a.txt");
  //創建一個輸出字節流的轉換流并且指定碼表進行寫數據
  OutputStreamWriter output=new OutputStreamWriter(fileout,"utf-8");
  output.write("中國");
  output.close();
  fileout.close();
 }
 public static void testOutput() throws Exception{
  Socket socket = new Socket(InetAddress.getLocalHost(),9090);
  //獲取到socket的輸出流對象。
  OutputStream outputStream = socket.getOutputStream();
  //把輸出字節流轉換成輸出字符流
  OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream);
  outputStreamWriter.write("不餓!");
 }
 public static void testInput() throws IOException{
  InputStream in=System.in;
  //輸入轉換流
  InputStreamReader input=new InputStreamReader(in);
  BufferedReader buffer=new BufferedReader(input);//用來做緩沖
  //int context =in.read();// 每次只會讀取到一個字節的數據
  System.out.print(buffer.readLine());//讀取一行數據
  //關閉字眼
  buffer.close();
  input.close();
 }
}