JavaWeb开发一个很简单的例子---MVC案例之查询

本文转载自查看原文 2017-01-17 15:47 2613 java

现在Javaweb开发第一阶段学习步入实践阶段，在这儿将自己做的项目记下来，也方便积累经验。

下图是处理流程：

MySQL数据库表如下所示：

1.在web项目webContent中新建test.jsp

<%@ 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>

    <a href="listAllStudentsServlet">List All Students</a>

</body> 
</html>

2在Java-src中新建ListAllStudentServlet.java，并对其进行配置

package com.javaweb.mvc;

import java.io.IOException; 
import java.util.Arrays; 
import java.util.List;

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


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

    
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
        
        StudentDao studentDao = new StudentDao(); 
        List<Student> students = studentDao.getAll(); 
        
        request.setAttribute("students", students); 
        request.getRequestDispatcher("/students.jsp").forward(request, response); 
        
        
    }

}

3.继续创建Student.java

package com.javaweb.mvc;

public class Student { 
    private Integer id; 
    private String studentName; 
    private String location; 
    private String telephone; 
    
    public Integer getId() { 
        return id; 
    } 
    public void setId(Integer id) { 
        this.id = id; 
    } 
    public String getStudentName() { 
        return studentName; 
    } 
    public void setStudentName(String studentName) { 
        this.studentName = studentName; 
    } 
    public String getLocation() { 
        return location; 
    } 
    public void setLocation(String location) { 
        this.location = location; 
    } 
    public String getTelephone() { 
        return telephone; 
    } 
    public void setTelephone(String telephone) { 
        this.telephone = telephone; 
    } 
    public Student(Integer id, String studentName, String location, String telephone) { 
        super(); 
        this.id = id; 
        this.studentName = studentName; 
        this.location = location; 
        this.telephone = telephone; 
    } 
    
   

}

4.创建StudentDao.java

package com.javaweb.mvc;

import java.util.ArrayList; 
import java.util.List; 
import java.sql.*;

public class StudentDao { 
    
    public List<Student> getAll(){ 
        List<Student> students = new ArrayList<Student>(); 
        Connection conn = null; 
        PreparedStatement ps = null; 
        ResultSet rs = null; 
        
        try { 
            
                Class.forName("com.mysql.jdbc.Driver"); 
            
            String url = "jdbc:mysql://localhost:3306/student?user=root&password=1234"; 
            String user = "root"; 
            String password = "1234"; 
            String sql = "select * from stu"; 
            conn = DriverManager.getConnection(url, user, password); 
            ps = conn.prepareStatement(sql); 
            rs = ps.executeQuery(); 
            while(rs.next()){ 
                int id = rs.getInt(1); 
                String studentName = rs.getString(2); 
                String location = rs.getString(3); 
                String telephone = rs.getString(4); 
                
                Student student = new Student(id, studentName, location, telephone); 
                
                students.add(student); 
            } 
            
        }catch (ClassNotFoundException e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
        } 
        catch (SQLException e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
        }finally{ 
            try { 
                if(rs != null) 
                    rs.close(); 
                if(ps != null) 
                    ps.close(); 
                if(conn != null) 
                    conn.close(); 
            } catch (SQLException e) { 
                // TODO Auto-generated catch block 
                e.printStackTrace(); 
            } 
        } 
        
        return students; 
    }

}

5.在webContent中新建students.jsp

<%-- 显示学生信息 --%> 
<%@page import="java.util.List"%> 
<%@page import="com.javaweb.mvc.Student" %> 
<%@ 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>

    
    <% 
        List<Student> students = (List<Student>)request.getAttribute("students"); 
        
    %> 
    <table> 
        <tr> 
            <th>id</th> 
            <th>studentName</th> 
            <th>location</th> 
            <th>telephone</th> 
        </tr> 
        
        <% 
            for(Student student:students){ 
        %> 
            <tr> 
                <td><%= student.getId() %></td> 
                <td><%= student.getStudentName() %></td> 
                <td><%= student.getLocation() %></td> 
                <td><%= student.getTelephone() %></td> 
            </tr> 
        <% 
            } 
        %> 
        
    </table> 
    
   

</body> 
</html>

6.添加JDBC驱动

添加在lib文件夹，因为lib文件夹中存放支持web应用运行的JAR文件

7.接下来就可以运行了

这是运行结果：

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