read.java

来自「一个基于Java语言开发的计算器的源代码」· Java 代码 · 共 68 行

package process;
import java.io.*;
import java.util.*;
public class Read {
	private String sourcefile;
	private FileInputStream fis=null;
	private static DataInputStream dis=null;
	public Read(String sourcefile){
		this.sourcefile=sourcefile;
		try{
			fis=new FileInputStream(sourcefile);
			dis=new DataInputStream(fis);	
		}catch(Exception e){
			System.out.println("鏁版嵁婧愭枃浠舵病鎵惧埌");
		}
	}
	public String getLoginName(){
		try{
			byte[] bs=readByte(32);
			String s=new String(bs);
			return s.trim();
		}catch(Exception e){
			throw new RuntimeException();
		}
	}
	public int getPid()throws Exception{
		readByte(4);//璺宠繃鏃犵敤瀛楄妭
		readByte(32);
		int i=dis.readInt();
		return i;
	}
	public short getType()throws Exception{
		return dis.readShort();
	}
	public long getTime()throws Exception{
		readByte(6);//璺宠繃鏃犵敤瀛楄妭
		int time1=dis.readInt();
		int time2=dis.readInt();
		return time1*1000L+time2;
	}
	public String getIP()throws Exception{
		readByte(4);
		readByte(20);
		readByte(2);//璺宠繃鏃犵敤瀛楄妭
		byte[] bs=readByte(257);
		return (new String(bs)).trim();
	}
	public void endOnceRead()throws Exception{
		readByte(1);
	}
	public boolean isEnd()throws Exception{
		return dis.available()==0;
	}
	public static byte[] readByte(int size)throws Exception{
		byte[] bs=new byte[size];
		for(int i=0;i<size;i++){
			bs[i]=dis.readByte();
		}
		return bs;
	}
	public static void main(String[]args)throws Exception{
		Read read=new Read("wtmpx");
		while(!read.isEnd()){
			System.out.println(read.getLoginName()+":"+read.getPid()+":"+read.getType()+":"+read.getTime()+":"+read.getIP());
			read.endOnceRead();
		}
	}
}