[计算机]ch1JavaEE框架技术概述.pptVIP

系统的后台 后台主要由以下三个部分： 论坛的管理：添加、修改、删除 用户的管理：修改、删除 帖子的管理：删除 Calculator类 package ; //计算器业务类 public class Calculator { public double add(double a, double b){return a+b; } public double del(double a, double b){return a-b; } public double mul(double a, double b){return a*b; } public double div(double a, double b){ if(b!=0){ return a/b; } else{ return 0; } } } add.jsp form name=calcForm method=post action=add.do table border=1 tr td第一个数：/td tdinput type=text name=num1//td /tr tr td第二个数：/td tdinput type=text name=num2//td /tr tr td colspan=2 align=center input type=submit value= 加 / input type=reset value=重填/ /td /tr /table /form add_result.jsp table border=1 tr td第一个数：/td td${param.num1}/td /tr tr td第二个数：/td td${param.num1}/td /tr tr td计算结果：/td td${requestScope.result}/td /tr /table action接口MyAction.java package org.sf.ssha.framework; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public interface MyAction { public String execute(HttpServletRequest request,HttpServletResponse response); } action的实现类 package org.sf.ssha.action; public class AddAction implements MyAction { Calculator biz=new Calculator(); //业务类 public String execute(HttpServletRequest request, HttpServletResponse response) { //接收数据 double num1=Double.parseDouble(request.getParameter(num1)); double num2=Double.parseDouble(request.getParameter(num2)); //调用业务方法执行业务操作 double result=biz.add(num1, num2); //在request域中存在数据 request.setAttribute(result, result); //转向 return add_result.jsp; } } Controller类 public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //得到action MyAction action=(MyAction)this.determinActionByPath(request); //调用action的execut