MVC基于Struts2的CRUD，java+bean+struts

1，所需jar包，将jar包导入lib中

2，项目目录结构

3，struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.3.dtd">
    
<struts>

<package name="default" namespace="/" extends="struts-default">
        <action name="DelStu" class="struts2.DelStu">
            <result>/index.jsp</result>
        </action>
        
        <action name="UpdateStu" class="struts2.UpdateStu">
            <result>/index.jsp</result>
        </action>
        
        <action name="AddStu" class="struts2.AddStu">
            <result>/index.jsp</result>
        </action>
    </package>
    
</struts>

4,web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>JE-sy2</display-name>
  <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
<!--   Struts2的框架的过滤器 -->
      <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>
    
    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
    
</web-app>

5,StudentDaoImpl.java

package dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import bean.Student;
import util.DBUtil;

public class StudentDaoImpl {
    public void addStudent(Student student)
    {
       Connection connection = DBUtil.getConnection();
       String sql = "insert into student (stuId,stuName) values (?,?)";
       PreparedStatement preparedStatement = null;
       try {
        preparedStatement= connection.prepareStatement(sql);
        preparedStatement.setString(1,student.getStuId());
        preparedStatement.setString(2, student.getStuName());
    
        preparedStatement.executeUpdate();
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }finally{
        DBUtil.close(preparedStatement);
        DBUtil.close(connection);
    }    
    }

    public void deleteStudent(String stuId) {
           Connection connection = DBUtil.getConnection();
           String sql = "delete from student where stuId= ?";
           PreparedStatement preparedStatement = null;
           try {
            preparedStatement= connection.prepareStatement(sql);
            preparedStatement.setString(1, stuId);
            preparedStatement.executeUpdate();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            DBUtil.close(preparedStatement);
            DBUtil.close(connection);
        }
        
    }

    public void updateStudent(Student student) {
           Connection connection = DBUtil.getConnection();
           String sql = "update student set stuName = ? where stuId=?";
           PreparedStatement preparedStatement = null;
           try {
            preparedStatement= connection.prepareStatement(sql);
            preparedStatement.setString(1, student.getStuName());
            preparedStatement.setString(2, student.getStuId());
            preparedStatement.executeUpdate();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            DBUtil.close(preparedStatement);
            DBUtil.close(connection);
        }    
        
    }

    public List<Student> loadStudent() {
           Connection connection = DBUtil.getConnection();
           String sql = "select * from student";
           PreparedStatement preparedStatement = null;
           ResultSet resultSet=null;
           Student student = null;
           List<Student> students=new ArrayList<>();
           try {
            preparedStatement=connection.prepareStatement(sql);
//            preparedStatement.setInt(1, id);
            resultSet=preparedStatement.executeQuery();
            while(resultSet.next())
            {
                student=new Student();
                student.setStuId(resultSet.getString("stuId"));
                student.setStuName(resultSet.getString("stuName"));
                students.add(student);
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            DBUtil.close(resultSet);
            DBUtil.close(preparedStatement);
            DBUtil.close(connection);
        }
        return students;
        
    }
}

6,AddStu.java

package struts2;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

import bean.Student;
import dao.StudentDaoImpl;

public class AddStu extends ActionSupport{
    HttpServletRequest request = ServletActionContext.getRequest();
    private static final long serialVersionUID = 1L;
    @Override
    public String execute() throws Exception {
    
        request.setCharacterEncoding("UTF-8");
        String stuId=request.getParameter("stuId");
        String stuName=request.getParameter("stuName");
        request.setAttribute("name",stuName);//设值
        
        Student student=new Student();
        student.setStuId(stuId);
        student.setStuName(stuName);
        StudentDaoImpl studentDaoImpl=new StudentDaoImpl();
        studentDaoImpl.addStudent(student);
//        response.sendRedirect("CRUD/index.jsp");
        return SUCCESS;
    }
}

7,addStu.jsp

<%@page import="java.util.ArrayList"%>
<%@page import="java.util.List"%>
<%@page import="dao.StudentDaoImpl"%>
<%@page import="bean.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>
<%
    Student student=new Student();
    StudentDaoImpl studentDaoImpl=new StudentDaoImpl();
    List<Student> students=studentDaoImpl.loadStudent();
//     System.out.println(request.getContextPath());
%>
<body>
    <center>
        <form action="AddStu.action" method="post">
            <table>
                <tr>
                    <td>学号：</td>
                    <td><input type="text" name="stuId"/></td>
                </tr>
                <tr>
                    <td>姓名：</td>
                    <td><input type="text" name="stuName"/></td>
                </tr>
                <tr>
                    <td><input type="submit" value="增加"/></td>
                </tr>
            </table>
        </form>
    </center>
</body>
</html>