filechanneltester.java

简单的WEB 应用(自己修改的)简单的WEB 应用

import java.io.*;
import java.nio.*;
import java.nio.channels.*;
import java.nio.charset.*;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.io.File;

public class FileChannelTester {
  public static void writeFile(String address,String str)throws IOException{
    final int BSIZE=1024;
	SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
	String time =  sdf.format(new Date()).toString();
  
  //向文件中写数据
  //FileChannel fc=new FileOutputStream("logs.txt").getChannel();
  //FileChannel fc=new FileOutputStream("logs.txt").getChannel();
  //  fc.write(ByteBuffer.wrap("你好,".getBytes()));
  //  fc.close();

	File file = new File(".\\logs");
		if(!file.exists())file.mkdirs();

    //向文件末尾添加数据
	FileChannel fc=new RandomAccessFile(".\\logs\\logs.txt","rw").getChannel();
    fc.position(fc.size());  //定位到文件末尾	
	if(null != str && !"".equals(str)){
		str = time + "：" + address + "，请求的页面为 " + str + " 。\r\n\r\n";
	} else {
		str = time + "：" + address +" 。\r\n\r\n";
	}
	fc.write(ByteBuffer.wrap(str.getBytes()));
    fc.close();

    //读数据
    //fc=new FileInputStream("D:\\logs.txt").getChannel();
	fc=new FileInputStream(".\\logs\\logs.txt").getChannel();
    ByteBuffer buff=ByteBuffer.allocate(BSIZE);
    fc.read(buff);  //把文件中的数据读入到ByteBuffer中
    buff.flip();
    Charset cs=Charset.defaultCharset(); //获得本地平台的字符编码
	String str2 = cs.decode(buff).toString(); //转换为Unicode编码
    System.out.println(str2); 
    
	fc.close();
  }
}