IT兄弟连 JavaWeb教程 JSP内置对象经典案例

  • 2019 年 10 月 5 日
  • 筆記

版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。

本文链接：https://blog.csdn.net/ITXDL123/article/details/90089806

案例需求：使用MVC模式编写一个程序当发起一个deptList.do请求时在servlet中准备一个部门列表对象，把这个列表对象放入request作用域中，然后转发到deptlist.jsp，使用jsp的语法来显示这个部门列表。部门类型是XdlDept成员变量有int id、String name、String loc。

案例实现：

● XdlDept类

package com.xdl.bean;  import java.io.Serializable;  public class XdlDept  implements Serializable{      private static final long serialVersionUID = 1L;      @Override      public String toString() {          return "XdlDept [deptno=" + deptno + ", dname=" + dname                     + ", loc=" + loc + "]n";      }      public XdlDept(int deptno, String dname, String loc) {          super();          this.deptno = deptno;          this.dname = dname;          this.loc = loc;      }      public XdlDept() {          super();      }      public int getDeptno() {          return deptno;      }      public void setDeptno(int deptno) {          this.deptno = deptno;      }      public String getDname() {          return dname;      }      public void setDname(String dname) {          this.dname = dname;      }      public String getLoc() {          return loc;      }      public void setLoc(String loc) {          this.loc = loc;      }      private  int  deptno;      private  String dname;      private  String  loc;  }

● XdlDeptController类

package com.xdl.controller;  import java.io.IOException;  import java.util.List;  import javax.servlet.ServletException;  import javax.servlet.annotation.WebServlet;  import javax.servlet.http.HttpServlet;  import javax.servlet.http.HttpServletRequest;  import javax.servlet.http.HttpServletResponse;  import com.xdl.bean.XdlDept;  import com.xdl.dao.XdlDeptDAO;  import com.xdl.dao.impl.XdlDeptDAOOracleImp;  @WebServlet("/deptList.do")  public class XdlDeptController extends HttpServlet {      private static final long serialVersionUID = 1L;      protected void service(HttpServletRequest request,          HttpServletResponse response) throws ServletException, IOException {          XdlDeptDAO  dao  =  new  XdlDeptDAOOracleImp();          // 通过M层获取数据          List<XdlDept>  depts = dao.getDeptList();          //放入对应的域对象          request.setAttribute("depts", depts);          // 跳转对应的页面          request.getRequestDispatcher("deptlist2.jsp").                forward(request, response);      }  }

● deptList.jsp

<%@page import="com.xdl.bean.XdlDept"%>  <%@page import="java.util.ArrayList"%>  <%@page import="com.xdl.bean.XdlUser"%>  <%@page import="java.util.List"%>  <%@ 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>  <style type="text/css">     table {        width:600px;        text-align: center;        border-collapse: collapse;     }     table,tr,td{        border:1px solid red;     }  </style>  </head>  <body>      <%           // 这是单行注释           /** 这叫文档注释  */           List<XdlDept> datas2 = (List<XdlDept>)request.getAttribute("depts");      %>      <table>           <tr>  <td>DEPTNO</td> <td> DNAME</td> <td> LOC</td> </tr>           <%              for(int i=0;i<datas2.size();i++){                 XdlDept  dept = datas2.get(i);           %>               <tr>                    <td><%=dept.getDeptno() %></td>                    <td><%=dept.getDname() %></td>                    <td><%=dept.getLoc() %></td> </tr>           <%  }           %>      </table>  </body>  </html>

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