北京市雨量检测信息管理系统（使用ajax+反射+EL+JSTL实现）

实体类RainManage：

package org.news.entity;

import java.util.Date;


public class RainManage {

	//districtName,monitorTime,rain,monitoringStation,monitoringAddress
	private Integer id;             //主键id
	private String districtName;    //区域名称
	private Date monitorTime;       //监测时间
    private Integer rain;           //雨量
    private String monitoringStation;//监测站
    private String monitoringAddress;//站点地址

    public Integer getId() {
        return id;
    }

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

    public String getDistrictName() {
        return districtName;
    }

    public void setDistrictName(String districtName) {
        this.districtName = districtName;
    }

    public Date getMonitorTime() {
        return monitorTime;
    }

    public void setMonitorTime(Date monitorTime) {
        this.monitorTime = monitorTime;
    }

    public Integer getRain() {
        return rain;
    }

    public void setRain(Integer rain) {
        this.rain = rain;
    }

    public String getMonitoringStation() {
        return monitoringStation;
    }

    public void setMonitoringStation(String monitoringStation) {
        this.monitoringStation = monitoringStation;
    }

    public String getMonitoringAddress() {
        return monitoringAddress;
    }

    public void setMonitoringAddress(String monitoringAddress) {
        this.monitoringAddress = monitoringAddress;
    }
}

BaseDao层：

package org.news.dao;

/**
 * 操作数据库的通用类
 * @author Think
 *
 */

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.naming.*;
import javax.sql.DataSource;

public class BaseDao {

	protected Connection connection = null;
	protected PreparedStatement preparedStatement = null;
	protected ResultSet resultSet = null;

	// 1、打开数据库

	public Connection getConnection() {
		
		try {
			Class.forName("com.mysql.jdbc.Driver");
			connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/rain?useUnicode=true&amp;characterEncoding=utf-8", "rootel","908071");
		} catch (Exception e) {
			e.printStackTrace();
		}
		return connection;
	}

	// 2、关闭所有资源

	public void closeAll(Connection connection,
			PreparedStatement preparedStatement, ResultSet result) {
		if (result != null) {
			try {
				result.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}

		if (preparedStatement != null) {
			try {
				preparedStatement.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}

		if (connection != null) {
			try {
				connection.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
	}

	// 3、增、删、改通用方法
	public int executeUpdate(String sql, Object... param) {
		int num = 0;// 影响行数
		connection = this.getConnection();
		try {
			preparedStatement = connection.prepareStatement(sql);
			// 为参数进行赋值
			if (param != null) {
				for (int i = 0; i < param.length; i++) {
					preparedStatement.setObject(i + 1, param[i]);
				}
			}
			// 执行SQL语句
			num = preparedStatement.executeUpdate();
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			this.closeAll(connection, preparedStatement, null);
		}
		return num;
	}

	/**
	 * 执行查询操作 备注：此方法适用于纯查询使用，若是输入加查询需要另外设计
	 * 
	 * @param sql
	 *            语句
	 * @return
	 */
	public ResultSet executeQuery(String sql, Object... param) {

		connection = this.getConnection();
		try {
			// 发送SQL语句
			preparedStatement = connection.prepareStatement(sql);
			// 参数进行赋值
			if (param != null) {
				for (int i = 0; i < param.length; i++) {
					preparedStatement.setObject(i + 1, param[i]);
				}
			}
			// 返回结果集
			resultSet = preparedStatement.executeQuery();

		} catch (Exception e) {

			closeAll(connection, preparedStatement, resultSet); // 关闭所有连接

			System.out.println("发生异常:\n" + e.getMessage());

		}
		return resultSet;
	}
}

接口类RainManageDao：

package org.news.dao;

import java.sql.SQLException;
import java.util.List;
import org.news.entity.RainManage;

public interface RainManageDao {
	//全部雨量信息
	List<RainManage> getAll() throws SQLException;
	//根据ID删除雨量信息
	int Del(int id);
	//添加雨量
	int insert(RainManage rainManage);
	
}

实现类RainManageDaoImpl：

package org.news.dao.impl;

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

import org.news.dao.BaseDao;
import org.news.dao.RainManageDao;
import org.news.entity.RainManage;
public class RainManageDaoImpl extends BaseDao implements RainManageDao {
    //显示全部信息
	@Override
	public List<RainManage> getAll() throws SQLException {
		connection = super.getConnection();
		String sql = "select * from tb_rainquality ";
		preparedStatement = connection.prepareStatement(sql);
		resultSet = preparedStatement.executeQuery();
		RainManage rainManage = null;
		List<RainManage> list = new ArrayList<RainManage>();

		//districtName,monitorTime,rain,monitoringStation,monitoringAddress
        while (resultSet.next()){
            rainManage=new RainManage();
            rainManage.setId(resultSet.getInt("id"));
            rainManage.setDistrictName(resultSet.getString("districtName"));
            rainManage.setMonitorTime(resultSet.getDate("monitorTime"));
            rainManage.setRain(resultSet.getInt("rain"));
            rainManage.setMonitoringStation(resultSet.getString("monitoringStation"));
            rainManage.setMonitoringAddress(resultSet.getString("monitoringAddress"));
            list.add(rainManage);
        }
        // 关闭文档流
		super.closeAll(connection, preparedStatement, resultSet);

		return list;
	}

    @Override
    public int Del(int id) {
	    String sql="DELETE FROM tb_rainquality WHERE id=?";
	    int result=0;
	    result=super.executeUpdate(sql,id);
        return result;
    }


    @Override
	public int insert(RainManage rainManage) {
	    String sql= "INSERT INTO tb_rainquality(districtName,monitorTime,rain,monitoringStation,monitoringAddress) VALUE(?,?,?,?,?);";
	    int result=0;
	    result=this.executeUpdate(sql,rainManage.getDistrictName(),rainManage.getMonitorTime(),rainManage.getRain(),
                rainManage.getMonitoringStation(),rainManage.getMonitoringAddress());
		return result;
	}



}

服务层接口RainManageService类：

package org.news.service;

import java.sql.SQLException;
import java.util.List;

import org.news.entity.RainManage;

public interface RainManageService {

	//全部雨量信息
	List<RainManage> getAll() throws SQLException;
	//根据ID删除雨量信息
	int Del(int id);
	//添加雨量
	int insert(RainManage rainManage);
}

RainManageServiceImpl实现服务接口类：

package org.news.service.impl;

import java.sql.SQLException;
import java.util.List;

import org.news.dao.RainManageDao;
import org.news.dao.impl.RainManageDaoImpl;
import org.news.entity.RainManage;
import org.news.service.RainManageService;

public class RainManageServiceImpl implements RainManageService {


	@Override
	public List<RainManage> getAll() throws SQLException {
		RainManageDao rainManageDao =new RainManageDaoImpl();
		return rainManageDao.getAll();
	}

	@Override
	public int Del(int id) {
		RainManageDao rainManageDao =new RainManageDaoImpl();
		return rainManageDao.Del(id);
	}


	@Override
	public int insert(RainManage rainManage) {
		RainManageDao rainManageDao =new RainManageDaoImpl();
		return rainManageDao.insert(rainManage);
	}
}

BaseServlet反射辅助类：

package org.news.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

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

public class BaseServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public BaseServlet() {
		super();
	}
	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}
	
	@Override
	protected void service(HttpServletRequest request,HttpServletResponse response){
		//创建java反射实现调用方法
		//不需要依赖实例化的对象就可以拿到所有类的资源
		try {			
			request.setCharacterEncoding("utf-8");		
			Class clazz=this.getClass();	
			String opr=	request.getParameter("opr");
			//this是拿到所有子类对象 		
			
			//一开始加载主页的时候没有参数，默认是加载全部显示数据
			if(opr==null){
				opr="list";
			}		
			//要找的方法的条件
			Method me=	clazz.getMethod(opr,
							HttpServletRequest.class,
								HttpServletResponse.class);			
			//调用method的方法
			me.invoke(this,request, response);
			
			} catch (IllegalArgumentException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (IllegalAccessException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (InvocationTargetException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (UnsupportedEncodingException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (SecurityException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (NoSuchMethodException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		
	}

}

删除，DelServlet类：

package org.news.servlet;

import org.news.service.RainManageService;
import org.news.service.impl.RainManageServiceImpl;

import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet(name="DelServlet",urlPatterns = "/DelServlet")
public class DelServlet extends BaseServlet {

    public void del(HttpServletRequest request, HttpServletResponse response){

        response.setCharacterEncoding("utf-8");
        int id=Integer.parseInt(request.getParameter("id"));
        RainManageService rainManageService=new RainManageServiceImpl();
        int result=rainManageService.Del(id);

        //System.out.println(result);

    }
}

添加,InsertServlet类：

package org.news.servlet;

import java.io.IOException;

import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.lang.model.element.NestingKind;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.news.entity.RainManage;
import org.news.service.RainManageService;
import org.news.service.impl.RainManageServiceImpl;


@WebServlet(name = "InsertServlet", urlPatterns = "/InsertServlet")
public class InsertServlet extends BaseServlet {

    /**
     *
     */
    private static final long serialVersionUID = 1L;


    //添加的方法
    public void insert(HttpServletRequest request, HttpServletResponse response) throws IOException, ParseException {

        response.setContentType("text/html;charset=utf-8");
        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
        PrintWriter out;
        String contextPath = request.getContextPath();

        //districtName,monitorTime,rain,monitoringStation,monitoringAddress
        String districtName = request.getParameter("districtName");
        Date monitorTime = new
                SimpleDateFormat("yyyy-MM-dd")
                .parse(request.getParameter("monitorTime"));
        int rain = Integer.parseInt(request.getParameter("rain"));
        String monitoringStation = request.getParameter("monitoringStation");
        String monitoringAddress = request.getParameter("monitoringAddress");

        RainManageService rainManageService = new RainManageServiceImpl();
        RainManage rainManage = new RainManage();
        rainManage.setDistrictName(districtName);
        rainManage.setMonitorTime(monitorTime);
        rainManage.setRain(rain);
        rainManage.setMonitoringStation(monitoringStation);
        rainManage.setMonitoringAddress(monitoringAddress);

        int result = rainManageService.insert(rainManage);

         out = response.getWriter();
        if (result == -1) {
            out.print("<script type=\"text/javascript\">");
            out.print("alert(\"添加没有成功\");");
            out.print("</script>");
        } else if (result == 0) {
            out.print("<script type=\"text/javascript\">");
            out.print("alert(\"未找到相关信息\");");
            out.print("</script>");
        } else {
            out.print("<script type=\"text/javascript\">");
            out.print("alert(\"已经成功添加信息，点击确认返回首页\");");
            out.print("location.href=\"" + contextPath
                    + "/ListServlet?opr=list\";");
            out.print("</script>");
        }

    }
}

显示全部信息的ListServlet类:

package org.news.servlet;

import java.io.IOException;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.news.entity.RainManage;
import org.news.service.RainManageService;
import org.news.service.impl.RainManageServiceImpl;

@WebServlet(name = "ListServlet", value = "/ListServlet")
public class ListServlet extends BaseServlet {
    
    private static final long serialVersionUID = 1L;

    // 查询
    public void list(HttpServletRequest request, HttpServletResponse response) throws SQLException, ServletException, IOException {

        RainManageService productService = new RainManageServiceImpl();
        List<RainManage> list = new ArrayList<RainManage>();
        list = productService.getAll();
        request.setAttribute("list", list);
        request.getRequestDispatcher("index.jsp").forward(request, response);


    }

}

index.jsp主页：

<%--
  Created by IntelliJ IDEA.
  User: Think
  Date: 2020/3/1
  Time: 20:19
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
    <title>雨量信息输出</title>
</head>
<style>
    * {
        margin: 0px;
        padding: 0px;
        margin: auto;
    }

    tr:nth-child(2n) {
        background-color: #fbc9a7
    }

    div {
        text-align: center;
    }

</style>
<body>
<script type="text/javascript" src="js/jquery-1.12.4.js"></script>
<script>
    function del(id) {

            var id2="#"+id;
            //alert("进来了del")
            var flag = confirm("确定要删除吗？");

            if (flag == true) {
                
                $(function () {
                    $.ajax({
                        url: "DelServlet?opr=del",//要提交的url路径
                        type: "get",     // 发送的请求方法
                        data: "id=" + id,  // 要发送到服务器的数据
                        dataType: "text",   // 指定返回的数据格式
                        success: function (id) { //响应成功后要执行的代码
                            //在这里移除文本样式
                            $(id2).parent().parent().remove();
                        },
                        error: function () {  // 请求失败后要执行的代码
                            alert("用户名验证时出现错误，请稍后再试或与管理员联系！");
                        }
                    });
                });
            }
    }


</script>
<div>
    <h3>雨量监测信息</h3>
    <table border="1">
        <tr>
            <td>序号</td>
            <td>区域名称</td>
            <td>监测时间</td>
            <td>雨量值(mm)</td>
            <td>监测站</td>
            <td>站点地址</td>
            <td>操作</td>
        </tr>
        <c:forEach items="${requestScope.list}" var="i">
            <tr>
                <td>${i.id}</td>
                <td>${i.districtName}</td>
                <td>${i.monitorTime}</td>
                <td>${i.rain}</td>
                <td>${i.monitoringStation}</td>
                <td>${i.monitoringAddress}</td>
                <td><a href="javaScript:del(${i.id})" id="${i.id}">删除</a></td>
            </tr>
        </c:forEach>
    </table>
    <a href="insert.jsp">新增雨量监测信息</a>
</div>

</body>
</html>

Insert.jsp页面:

<%--
  Created by IntelliJ IDEA.
  User: Think
  Date: 2020/3/1
  Time: 22:23
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>新增雨量监测信息</title>
</head>
<style>
    *{
        margin: 0px;
        padding: 0px;
        margin: auto;
    }
</style>
<body>
<script type="text/javascript" src="js/jquery-1.12.4.js"></script>
<script>
    $(function () {
        //清空事件
        $('#reset').click(function () {
            $('[type=text]').val('');
        })
        
        //保存的点击事件
        $('#save').click(function(){

            var districtName=$('#districtName').val();
            var monitorTime=$('#monitorTime').val();
            var r=new RegExp(/^(\d{4})-(0\d{1}|1[0-2])-(0\d{1}|[12]\d{1}|3[01])$/);//日期格式验证的正则表达式
            var num=new RegExp(/^\d{1}$/);
            var rain=$('#rain').val();
            var monitoringStation=$('#monitoringStation').val();
            var monitoringAddress=$('#monitoringAddress').val();

            // alert(monitoringAddress+"测试成功")
            if (districtName==""||monitorTime==""
                ||rain==""||monitoringStation==""
                ||monitoringAddress=="") {
                alert("所有选项必填!")
            }else if (!r.test(monitorTime)){
                alert("日期格式不正确，必须是yyyy-MM-dd格式！")
            }else if (!num.test(rain)){
                alert("雨量值有误!");
            }else{
                window.location.href="javascript:document.form.submit()";
            }
        })

    })

</script>
    <div>
        <h3>新增雨量监测信息</h3>
        <form name="form" action="InsertServlet?opr=insert" method="post">
            区域名称:<input type="text" name="districtName" id="districtName"><br>
            监测时间:<input type="text" name="monitorTime" id="monitorTime"><span>yyyy-MM-dd格式</span><br>
            雨量值(mm):<input type="text" name="rain" id="rain"><br>
            监测站:<input type="text" name="monitoringStation" id="monitoringStation"><br>
            站点地址:<input type="text" name="monitoringAddress" id="monitoringAddress"><br>
            <input type="button" value="保存" id="save">
            <input type="button" value="重置" id="reset">
            <a href="javascript:history.go(-1)"><button type="button">返回</button></a>
        </form>
    </div>
</body>
</html>

来源：CSDN

作者：^Truth

链接：https://blog.csdn.net/qq_44739706/article/details/104619449

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