Java中IO流详解

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(); } //将文件的内容读取出来 public static void readFile() throws IOException{  //建立文件与程序的输入数据通道  FileInputStream filein=new FileInputStream("F://a.txt");  //创建输入字节流的转换流并且指定码表进行读取  InputStreamReader inputin=new InputStreamReader(filein,"utf-8");  //FileReader filein =new FileReader("F://a.txt");//这种会出现乱码的情况   int context=0;  while((context=inputin.read())!=-1){   System.out.print((char)context);  }  //关闭资源  inputin.close();  filein.close();  } //将内容用utf-8的格式写入文件中 public static void writeFile() throws IOException{  //建立了文件与程序的数据 通道  FileOutputStream fileout=new FileOutputStream("F://a.txt");  //创建一个输出字节流的转换流并且指定码表进行写数据  OutputStreamWriter output=new OutputStreamWriter(fileout,"utf-8");  output.write("中国");  output.close();  fileout.close(); } public static void testOutput() throws Exception{  Socket socket = new Socket(InetAddress.getLocalHost(),9090);  //获取到socket的输出流对象。  OutputStream outputStream = socket.getOutputStream();  //把输出字节流转换成输出字符流  OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream);  outputStreamWriter.write("不饿!"); } public static void testInput() throws IOException{  InputStream in=System.in;  //输入转换流  InputStreamReader input=new InputStreamReader(in);  BufferedReader buffer=new BufferedReader(input);//用来做缓冲  //int context =in.read();// 每次只会读取到一个字节的数据  System.out.print(buffer.readLine());//读取一行数据  //关闭字眼  buffer.close();  input.close(); }}