Java Servlet MVC，将数据库查询结果显示到JSP表

请帮助我了解

MVC

javaservlet。我在多行多列上显示数据库查询结果时发现了问题（加载所有数据，假设我在查询后得到10行），我希望加载

JSP

表中的所有学生列表

如何在servlet中设置属性和在JSP中设置属性

我将查询结果设置为数组列表，这是我的代码：

Bean类

package com.mvc.bean;

public class StudentBean {
    private String name;
    private String id;

    public String getName() {
        return name;
    }

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

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }
} 

package com.mvc.dao;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;

import com.mvc.bean.StudentBean;
import com.mvc.util.DBConnection;

public class StudentDao {
    public ArrayList<StudentBean> getStudent() {
        ArrayList<StudentBean> list_student = new ArrayList<StudentBean>();
        Connection con = null;
        Statement statement = null;
        ResultSet resultSet = null;

        try {
            con = DBConnection.createConnection();
            statement = con.createStatement();
            resultSet = statement.executeQuery("SELECT * FROM tbl_student");
            while(resultSet.next()){
                StudentBean studentBean = new StudentBean();
                studentBean.setId(resultSet.getString("id"));
                studentBean.setName(resultSet.getString("name"));
                list_student.add(studentBean);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return list_student;
    }
}

package com.mvc.controller;

import java.io.IOException;
import java.util.ArrayList;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.mvc.bean.StudentBean;
import com.mvc.dao.StudentDao;

public class StudentServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    public StudentServlet() {

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        StudentDao studentDao = new StudentDao();
        ArrayList<StudentBean> studentList = studentDao.getStudent();

        //I have get value studentBean as array list
        //Here, how to request.setAttribute ? i want passing to jsp table
        request.getRequestDispatcher("/Student.jsp").forward(request, response);
    }
}

DAO类

package com.mvc.bean;

public class StudentBean {
    private String name;
    private String id;

    public String getName() {
        return name;
    }

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

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }
} 

package com.mvc.dao;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;

import com.mvc.bean.StudentBean;
import com.mvc.util.DBConnection;

public class StudentDao {
    public ArrayList<StudentBean> getStudent() {
        ArrayList<StudentBean> list_student = new ArrayList<StudentBean>();
        Connection con = null;
        Statement statement = null;
        ResultSet resultSet = null;

        try {
            con = DBConnection.createConnection();
            statement = con.createStatement();
            resultSet = statement.executeQuery("SELECT * FROM tbl_student");
            while(resultSet.next()){
                StudentBean studentBean = new StudentBean();
                studentBean.setId(resultSet.getString("id"));
                studentBean.setName(resultSet.getString("name"));
                list_student.add(studentBean);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return list_student;
    }
}

package com.mvc.controller;

import java.io.IOException;
import java.util.ArrayList;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.mvc.bean.StudentBean;
import com.mvc.dao.StudentDao;

public class StudentServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    public StudentServlet() {

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        StudentDao studentDao = new StudentDao();
        ArrayList<StudentBean> studentList = studentDao.getStudent();

        //I have get value studentBean as array list
        //Here, how to request.setAttribute ? i want passing to jsp table
        request.getRequestDispatcher("/Student.jsp").forward(request, response);
    }
}

package com.mvc.dao；
导入java.sql.Connection；
导入java.sql.ResultSet；
导入java.sql.Statement；
导入java.util.ArrayList；
导入com.mvc.bean.StudentBean；
导入com.mvc.util.DBConnection；
公立班学生{
公共数组列表getStudent（）{
ArrayList_student=新建ArrayList（）；
连接con=null；
Statement=null；
ResultSet ResultSet=null；
试一试{
con=DBConnection.createConnection（）；
statement=con.createStatement（）；
resultSet=statement.executeQuery（“从tbl_学生中选择*）；
while（resultSet.next（））{
StudentBean StudentBean=新StudentBean（）；
setId（resultSet.getString（“id”）；
setName（resultSet.getString（“name”）；
list_student.add（studentBean）；
}
}捕获（例外e）{
e、 printStackTrace（）；
}
留学生返回名单；
}
}

Servlet类

package com.mvc.bean;

public class StudentBean {
    private String name;
    private String id;

    public String getName() {
        return name;
    }

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

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }
} 

package com.mvc.dao;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;

import com.mvc.bean.StudentBean;
import com.mvc.util.DBConnection;

public class StudentDao {
    public ArrayList<StudentBean> getStudent() {
        ArrayList<StudentBean> list_student = new ArrayList<StudentBean>();
        Connection con = null;
        Statement statement = null;
        ResultSet resultSet = null;

        try {
            con = DBConnection.createConnection();
            statement = con.createStatement();
            resultSet = statement.executeQuery("SELECT * FROM tbl_student");
            while(resultSet.next()){
                StudentBean studentBean = new StudentBean();
                studentBean.setId(resultSet.getString("id"));
                studentBean.setName(resultSet.getString("name"));
                list_student.add(studentBean);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return list_student;
    }
}

package com.mvc.controller;

import java.io.IOException;
import java.util.ArrayList;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.mvc.bean.StudentBean;
import com.mvc.dao.StudentDao;

public class StudentServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    public StudentServlet() {

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        StudentDao studentDao = new StudentDao();
        ArrayList<StudentBean> studentList = studentDao.getStudent();

        //I have get value studentBean as array list
        //Here, how to request.setAttribute ? i want passing to jsp table
        request.getRequestDispatcher("/Student.jsp").forward(request, response);
    }
}

package com.mvc.controller；
导入java.io.IOException；
导入java.util.ArrayList；
导入javax.servlet.ServletException；
导入javax.servlet.http.HttpServlet；
导入javax.servlet.http.HttpServletRequest；
导入javax.servlet.http.HttpServletResponse；
导入com.mvc.bean.StudentBean；
导入com.mvc.dao.StudentDao；
公共类StudentServlet扩展了HttpServlet{
私有静态最终长serialVersionUID=1L；
公共学生servlet（）{
}
受保护的void doGet（HttpServletRequest请求，HttpServletResponse响应）抛出ServletException，IOException{
StudentDao StudentDao=新StudentDao（）；
ArrayList studentList=studentDao.getStudent（）；
//我已将值studentBean作为数组列表获取
//这里，如何请求.setAttribute？我想传递到jsp表
request.getRequestDispatcher（“/Student.jsp”）.forward（请求，响应）；
}
}

JSP

<!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=ISO-8859-1">
        <title>Student</title>
    </head>
    <body>
        <table>
        <tr>
            <th>Id</th>
            <th>Name</th>
        </tr>
        <tr>
            //Here i want get array value from servlet, how to ?
            <td><%=request.getAttribute("?") %></td>
            <td<%=request.getAttribute("?") %>></td>
        </tr>
        </table>
    </body>
</html>

学生
身份证件
名称
//这里我想从servlet中获取数组值，如何？

---

否则？

可以从java代码中使用：

request.setAttribute（“mylist”，studentBean）

在JSP中，需要使用
request.getAttribute（“mylist”）
你会得到你的名单

对于表，您需要进行循环以从列表中提取信息。
已解决，在Servlet类中添加了
request.setAttribute

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    StudentDao studentDao = new StudentDao();
    ArrayList<StudentBean> studentList = studentDao.getStudent();

    //added here
    request.setAttribute("studentList", studentList);

    request.getRequestDispatcher("/Student.jsp").forward(request, response);
}

在表中，使用
forEach
提取
标记

.getID（）
和
.getName（）
请参阅Bean类方法：

<table>
    <tr>
        <th>Id</th>
        <th>Name</th>
    </tr>
    <c:forEach var="studentBean" items="${studentList}">
        <tr>  
            <td>${studentBean.getID()}</td>
            <td>${studentBean.getName()}</td>
        </tr>
    </c:forEach>
</table>


身份证件
名称
${studentBean.getID（）}
${studentBean.getName（）}