📄 showpriceservlet.java

📁 J2EE 技术源码书籍源代码（j2ee编程技术）

💻 JAVA

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/*
 * Created on 2004-6-13
 *
 * To change the template for this generated file go to
 * Window - Preferences - Java - Code Generation - Code and Comments
 */
package com.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author haoyulong
 *
 * To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Generation - Code and Comments
 */
public class ShowPriceServlet extends HttpServlet {
	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		//TODO Method stub generated by Lomboz
		response.setContentType("text/html;charset=gb2312");
		PrintWriter out = response.getWriter();
		String Price=(String)getServletConfig().getServletContext().getAttribute("Price");
        if(Price==null){Price=new String("0");
        }
        String oldPrice=(String)request.getSession().getAttribute("OldPrice");
        
        
        out.println("<HTML><HEAD><TITLE>南京猪肉价格显示 "
	                + "</TITLE></HEAD>");
	    out.println("<BODY>");
	    out.println("南京市场当前猪肉价格："+Price+"元/斤");
	    if(oldPrice!=null){
	    	out.println("<BR>");
		    out.println("南京市场过去猪肉价格："+oldPrice+"元/斤");
        	int p1=Integer.parseInt(oldPrice,10);
     	    int p2=Integer.parseInt(Price,10);
     	    if(p1<p2)out.println(" 唉～～,猪肉又涨价了，日子没法过了！");
     	    if(p1>p2)out.println(" 好消息,猪肉降价了!");
        }
	    out.println("</BODY></HTML>");
		//更新会话中的猪肉价格
	    request.getSession().setAttribute("OldPrice",Price);

	}
}

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