控制类改进：Spring IoC程序
提交页面一个查看商品的链接：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> This is my JSP page. <br> <a href="domain">查看已购买的商品</a> </body> </html>
实体类Product
注意：实体勒种必须要有无参构造函数，否则在applicationContext.xml配置文件中将会报错
No constructor with 0 arguments defined in class 'Spring_modle.Product' applicationContext.xml /Spring_Ioc_DI/src line 7 Spring Beans Problem
package Spring_modle; public class Product { /** * @return the name */ public String getName() { return name; } /** * @param name the name to set */ public void setName(String name) { this.name = name; } /** * @return the pirce */ public double getPirce() { return pirce; } /** * @param pirce the pirce to set */ public void setPirce(double pirce) { this.pirce = pirce; } private String name; private double pirce; /** * 有参构造 * @param name * @param pirce */ public Product(String name, double pirce) { super(); this.name = name; this.pirce = pirce; } /** * @author tianjie *Spring注入必须要有无参构造，否则 applicationContext.xml将会报错 * 无参构造 * */ public Product() { } } 后台控制类servlet
package Spring_Control; import java.io.IOException; import java.util.ArrayList; import java.util.List; 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 org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import Spring_modle.Product; public class domain extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { /** * 静态获取 * */ // ApplicationContext con= // new ClassPathXmlApplicationContext(new String[]{"applicationContext.xml"}); // // Proudect p1,p2,p3; // p1=con.getBean("p1",Proudect.class); // p2=con.getBean("p2",Proudect.class); // p3=con.getBean("p3",Proudect.class); // // List<Proudect> list=new ArrayList<Proudect>(); // list.add(p1); // list.add(p2); // list.add(p3); /** * 动态获取 * */ ApplicationContext con= new ClassPathXmlApplicationContext(new String[]{"applicationContext.xml"}); String[] p=con.getBeanNamesForType(Product.class); List<Product> list=new ArrayList<Product>(); Product proudect; for(int i=0;i<p.length;i++){ proudect=con.getBean(p[i],Product.class); list.add(proudect); } HttpSession session=request.getSession(); session.setAttribute("list", list); response.sendRedirect("details.jsp"); } } applicationContext.xml配置文件
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <bean name="p1" class="Spring_modle.Product" ><!-- 控制反转 --> <property name="name" value="化妆品"></property><!-- 依赖注入 --> <property name="pirce" value="300"></property> </bean> <bean name="p2" class="Spring_modle.Product"><!-- 控制反转 --> <property name="name" value="轮滑鞋"></property><!-- 依赖注入 --> <property name="pirce" value="500"></property> </bean> <bean name="p3" class="Spring_modle.Product"><!-- 控制反转 --> <property name="name" value="书"></property><!-- 依赖注入 --> <property name="pirce" value="30"></property> </bean> </beans> 结果页面 details.jsp
<%@page import="java.util.List"%> <%@page import="Spring_modle.Proudect"%> <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <center> <% out.write("输出商品：<br>"); List<Proudect> list=(List<Proudect>)session.getAttribute("list"); for(int i=0;i<list.size();i++){ out.write("商品名称："+list.get(i).getName()+"<br>"); out.write("商品名称："+list.get(i).getPirce()+"<br>"); } %> </center> </body> </html>
