servlet与jsp的运用涉及EL和JavaBean知识点

原创已于 2022-10-17 19:09:49 修改 · 189 阅读

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文章标签：

#servlet #前端 #javascript

于 2022-10-17 19:08:27 首次发布

Javaweb 专栏收录该内容

1 篇文章

订阅专栏

本文介绍了如何使用Java Servlet和JSP实现一个简单的学生信息管理页面，展示了如何封装Student对象、创建servlet动态生成数据并通过JSTL遍历显示在jsp上。

1.对属性进行封装

package stu;

public class Student {
    private String name;
    private int  sex;
    private String major;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getSex() {
        return sex;
    }

    public void setSex(int sex) {
        this.sex = sex;
    }

    public String getMajor() {
        return major;
    }

    public void setMajor(String major) {
        this.major = major;
    }
}

2.创建servlet项目

package stu;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

@WebServlet(name = "StuListServlet", value = "/StuListServlet")
public class StuListServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        List<Student> students=new ArrayList<>();
        Student stu1=new Student();
        stu1.setName("刘德华");
        stu1.setSex(1);
        stu1.setMajor("软件工程");
        students.add(stu1);
        Student stu2=new Student();
        stu2.setName("张曼玉");
        stu2.setSex(0);
        stu2.setMajor("数字媒体");
        students.add(stu2);
        Student stu3=new Student();
        stu3.setName("张学友");
        stu3.setSex(1);
        stu3.setMajor("软件工程");
        students.add(stu3);

        request.setAttribute("students", students);
        request.getRequestDispatcher("stuList.jsp").forward(request, response);


    }

//    @Override
//    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//
//    }
}

3.导入jar包

下载地址：https://tomcat.apache.org/taglibs/standard/

添加到依赖中

4.创建jsp文件

<%@ page import="java.util.List" %>
<%@ page import="java.util.ArrayList" %><%--
  Created by IntelliJ IDEA.
  User: 璀璨的SUN
  Date: 2022/10/17
  Time: 18:37
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!-- 引入核心标签库 -->
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<html>
<head>
    <title>Title</title>
</head>
<body>
<%--效果一代码--%>
<%--<table border="1">--%>
<%--    <tr><th>姓名</th><th>性别</th><th>专业</th></tr>--%>
<%--    <c:forEach var="stu" items="${students}">--%>
<%--        <tr>--%>
<%--            <td>${stu.name}</td>--%>
<%--            <td>${stu.sex==0?'女':'男'}</td>--%>
<%--            <td>${stu.major}</td></tr>--%>
<%--    </c:forEach>--%>


<%--</table>--%>



<%--效果二代码--%>
<%
    List<String> names=new ArrayList<>();
    names.add("刘德华");
    names.add("张曼玉");
    names.add("张学友");
    request.setAttribute("names", names);


%>

<c:forEach var="name" items="${names}">
    <br>${name}
</c:forEach>

</body>
</html>

5.引入核心库标签

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

6.配置web.xml