北大青鸟 Y2JAVA 指导学习 “我形我印”打印器

package com.print.biz; 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; import javax.servlet.http.HttpSession; import com.print.entity.Shape; import com.print.entity.ShapeInfo; public class PrintServlet extends HttpServlet { /** * 处理Get请求 * * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //如果图形信息为空，则转到图形选择页面 if(request.getParameter("shape") != null && request.getParameter("style") != null && request.getParameter("shape").trim() == "" && request.getParameter("style").trim() == "" ){ response.sendRedirect(request.getContextPath() + "/shapeInfo.jsp"); return; }//获取表单信息 else if (request.getParameter("shape") != null && request.getParameter("style") != null && request.getParameter("shape").trim() != "" && request.getParameter("style").trim() != "") { ShapeInfo shapeInfo = new ShapeInfo(); //实例化图形类 int shapeId = Integer.parseInt(request.getParameter("shape")); Shape shape = Shape.getShapeById(shapeId); //获取形状的枚举值 //将获取的值封装到ShapeInfo类中 shapeInfo.setShapeId(shape); shapeInfo.setShapeStyle(new String(request.getParameter("style").getBytes("ISO-8859-1"))); request.setAttribute("shapeInfo", shapeInfo); //用request保存图形信息 request.getRequestDispatcher("printShape.jsp").forward(request, response); //转发到打印页面 } } /** * 处理Post请求 * * This method is called when a form has its tag value method equals to post. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }