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import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.ServletException; import javax.servlet.ServletConfig; import java.io.IOException; import java.io.PrintWriter; import java.util.HashMap; /** * Created by IntelliJ IDEA. * User: ming * Date: 2008-6-14 * Time: 9:35:50 * To change this template use File | Settings | File Templates. * 返回股票当前信息的servlet */ public class GetStocksInfo extends HttpServlet { //保存股票对象的map private HashMap<String,Stock> stocks; protected void doGet(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws ServletException, IOException { //返回两只股票的价格信息 //1。计算随机数 double sz = Math.random() * 20; double pf = Math.random() * 0.5; //通过随机数是奇数还是偶数来判断股票上涨还是下跌 boolean flagsz = ((int)(Math.random() * 10)) % 2 == 0; boolean flagpf = ((int)(Math.random() * 10)) % 2 == 0; //2。将随机数和股票的当前价格进行加或减的操作，得到新的当前价格 Stock szzs = stocks.get("300001"); Stock pfyh = stocks.get("000001"); double temp; if (flagsz) { temp = szzs.getNow() + sz; } else { temp = szzs.getNow() - sz; } //需要对新的当前价格进行截取，只保留小数点后两位 temp = (int)(temp * 100) / 100.0; szzs.setNow(temp); if (flagpf) { temp = pfyh.getNow() + pf; } else { temp = pfyh.getNow() - pf; } temp = (int)(temp * 100) / 100.0; pfyh.setNow(temp); httpServletResponse.setContentType("text/html;charset=gb2312"); PrintWriter out = httpServletResponse.getWriter(); //out.println(szzs + "<br />" + pfyh); //3。返回两只股票的昨天收盘，今天开盘和当前价格 //采用json的数据格式返回股票的信息 StringBuilder builder = new StringBuilder(); //采用数组的方式回传两个股票对象 /* builder.append("[{name:\"").append(szzs.getName()).append("\",id:\"").append(szzs.getId()) .append("\",yes:").append(szzs.getYesterday()).append(",tod:").append(szzs.getToday()) .append(",now:").append(szzs.getNow()) .append("},") .append("{name:\"").append(pfyh.getName()).append("\",id:\"").append(pfyh.getId()) .append("\",yes:").append(pfyh.getYesterday()).append(",tod:").append(pfyh.getToday()) .append(",now:").append(pfyh.getNow()) .append("}]"); */ //采用对象的方式回传两个股票对象 builder.append("{") .append("\"").append(szzs.getId()).append("\":{name:\"").append(szzs.getName()) .append("\",yes:").append(szzs.getYesterday()).append(",tod:").append(szzs.getToday()) .append(",now:").append(szzs.getNow()) .append("},") .append("\"").append(pfyh.getId()).append("\":{name:\"").append(pfyh.getName()) .append("\",yes:").append(pfyh.getYesterday()).append(",tod:").append(pfyh.getToday()) .append(",now:").append(pfyh.getNow()) .append("}}"); out.println(builder); } protected void doPost(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws ServletException, IOException { doGet(httpServletRequest, httpServletResponse); } public void init(ServletConfig servletConfig) throws ServletException { stocks = new HashMap<String,Stock>(); //创建股票 Stock szzs = new Stock(3000.0,2990.1,"上证指数","300001"); Stock pfyh = new Stock(23.22, 23.50,"浦发银行","000001"); //将两只股票保存在stocks的map中 stocks.put(szzs.getId(),szzs); stocks.put(pfyh.getId(),pfyh); System.out.println(stocks); } }