本节主要介绍SpringMVC简单的增删改查功能。

1.查询

dao中的代码

     public List<WeatherPojo> getAllWeather(){

         String sql="select * from weathertest";

         List<WeatherPojo> pojos=new ArrayList<WeatherPojo>();

         pojos= jdbcTemplate.query(sql,new RowMapper() {

             @Override

             public Object mapRow(ResultSet rs, int arg1) throws SQLException {

                 // TODO Auto-generated method stub

                 WeatherPojo weather=new WeatherPojo();

                 weather.setName(rs.getString("name"));

                 weather.setPassword(rs.getString("password"));

                 weather.setId(rs.getInt("id"));

                 return weather;

             }

         });

         return pojos;

     }

查询

同事，还可以写service和serviceimpl。需要对jdmctempl添加注解

@Autowired
private JdbcTemplate jdbcTemplate;

在impl中需要对dao添加注解

@Autowired
private WeatherDao weatherDao;

在controller中调用服务

     @Autowired

     private WeatherServiceImpl weatherService;

     @RequestMapping(params="method=query")

     public ModelAndView getAllWeather(HttpServletRequest request,HttpServletResponse response){

         List<WeatherPojo> pojos=weatherService.getWeatherList();

         request.setAttribute("weathers", pojos);

         System.out.println(pojos.get(0).getName());

         return new ModelAndView("weatherlist");

     }

通过modelandview返回页面,页面代码如下：

 <%@ page language="java" contentType="text/html; charset=utf-8"

     pageEncoding="utf-8"%>

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

     <%String path = request.getContextPath();

 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

 %>

 <!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>

 <div><a href="<%=basePath %>weather.do?method=add">添加</a></div>

 <div>

 <table>

 <thead>

 <tr>

 <th>姓名</th>

 <th>说明</th>

 <th>操作</th>

 </tr>

 </thead>

 <tbody>

 <c:forEach var="item" items="${weathers}">

 <tr>

 <td>${item.name }</td>

 <td>${item.password }</td>

 <td></td>

 <td><a href="<%=basePath %>weather.do?method=edit&id=${item.id}">编辑</a><a href="<%=basePath %>weather.do?method=delete&id=${item.id}">删除</a></td>

 </tr>

 </c:forEach>

 </tbody>

 </table>

 </div>

 </body>

 </html>

list

2.增加

dao中代码

     public void addWeather(WeatherPojo weather){

         String sql="insert into weathertest(id,name,password) values("+weather.getId()+",'"+weather.getName()+"','"+weather.getPassword()+"')";

         jdbcTemplate.execute(sql);

     }

controller代码，get方法是进入新增页面，页面传递空对象。post方法为添加新的记录

     @RequestMapping(params="method=add",method=RequestMethod.GET)

     public ModelAndView addWeather(HttpServletRequest request,HttpServletResponse reponse){

         request.setAttribute("weather", new WeatherPojo());

         return new ModelAndView("weatheradd");

     }

     @RequestMapping(params="method=add",method=RequestMethod.POST)

     public ModelAndView addWeather(WeatherPojo weather){

         weatherService.addWeather(weather);

         return new ModelAndView("redirect:/weather.do?method=query");

     }

jsp页面代码

 <%@ page language="java" contentType="text/html; charset=utf-8"

     pageEncoding="utf-8"%>

         <%String path = request.getContextPath();

 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

 %>

 <!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>

 <form action="<%=basePath%>weather.do?method=add" method="post">

 <label for="id">id</label>

 <input name="id"/><br>

 <label for="name">name</label>

 <input name="name"><br>

 <label for="password">password</label>

 <input name="password"><br>

 <input type="submit" value="提交">

 </form>

 </body>

 </html>

3.修改

dao中代码：

 public void editWeather(WeatherPojo weather){

         String sql="update weathertest set name='"+weather.getName()+"',password='"+weather.getPassword()+"' where id="+weather.getId()+"";

         jdbcTemplate.execute(sql);

     }

controller代码

 @RequestMapping(params="method=edit",method=RequestMethod.GET)

     public ModelAndView editWeather(HttpServletRequest request,HttpServletResponse response){

         int id=Integer.valueOf(request.getParameter("id"));

         WeatherPojo weather=new WeatherPojo();

         weather=weatherService.getWeatherById(id);

         ModelAndView mav=new ModelAndView("editweather");

         request.setAttribute("weather", weather);

         System.out.println("--------"+weather.getId());

         System.out.println("--------"+weather.getName());

         System.out.println("--------"+weather.getPassword());

         return mav;

     }

     @RequestMapping(params="method=edit",method=RequestMethod.POST)

     public ModelAndView editWeather(WeatherPojo weather){

         weatherService.editWeather(weather);

         return new ModelAndView("redirect:/weather.do?method=query");

     }

jsp页面：

 <%@ page language="java" contentType="text/html; charset=utf-8"

     pageEncoding="utf-8"%>

             <%String path = request.getContextPath();

 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

 %>

 <!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>

 <form action="<%=basePath%>weather.do?method=edit" method="post">

 <label for="id">id</label>

 <input name="id" readonly="true" value="${weather.id }"/><br>

 <label for="name">name</label>

 <input name="name" value="${weather.name }"><br>

 <label for="password" >password</label>

 <input name="password" value="${weather.password }"><br>

 <input type="submit" value="提交">

 </form>

 </body>

 </html>

4.删除

dao中代码：

    //delete

    public void deleteWeather(int id){

        String sql="delete from weathertest where id="+id;

        jdbcTemplate.execute(sql);

    }

controller代码：

    @RequestMapping(params="method=delete",method=RequestMethod.GET)

    public ModelAndView deleteWeather(HttpServletRequest request,HttpServletResponse response){

        int id=Integer.valueOf(request.getParameter("id"));

        weatherService.deleteWeather(id);

        //页面重定向

        return new ModelAndView("redirect:/weather.do?method=query");

    }

jsp代码：

 <%@ page language="java" contentType="text/html; charset=utf-8"

     pageEncoding="utf-8"%>

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

     <%String path = request.getContextPath();

 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

 %>

 <!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>

 <div><a href="<%=basePath %>weather.do?method=add">添加</a></div>

 <div>

 <table>

 <thead>

 <tr>

 <th>姓名</th>

 <th>说明</th>

 <th>操作</th>

 </tr>

 </thead>

 <tbody>

 <c:forEach var="item" items="${weathers}">

 <tr>

 <td>${item.name }</td>

 <td>${item.password }</td>

 <td></td>

 <td><a href="<%=basePath %>weather.do?method=edit&id=${item.id}">编辑</a><a href="<%=basePath %>weather.do?method=delete&id=${item.id}">删除</a></td>

 </tr>

 </c:forEach>

 </tbody>

 </table>

 </div>

 </body>

 </html>

SpringMvc学习-增删改查的更多相关文章

  1. springMVC实现增删改查

    首先需要准备好一张数据库表我这里用emp这张表:具体代码: /* SQLyog 企业版 - MySQL GUI v8.14 MySQL - 5.1.73-community ************* ...

  2. Oracle的登陆问题和初级学习增删改查(省略安装和卸载)

    1:学习Oracle首先需要安装Oracle,网上已经有很多很多教程了,这里不做叙述,自己百度即可,这里安装的标准版,个人根据需求安装学习或者企业开发即可.如果安装出错,自己百度Oracle的卸载即可 ...

  3. springMVC之增删改查

    一.核心原理 1. 用于发送请求给server: /home.htm 2. 请求被DispatchServlet拦截到 3. DispatchServlet通过HandleMapping检查url有没 ...

  4. 基于SpringMVC的增删改查

    废话不多说,直接开始步骤! 1.创建一个Dynamic Web Project 2.在WEB-INF包下的lib文件夹中引入相关jar commons-logging-.jar jstl.jar sp ...

  5. 【SpringBoot】11-1.Springboot整合Springmvc+Mybatis增删改查操作（下）

    整合过程:https://www.isdxh.com/68.html 一.增--增加用户 1.创建实体类 package com.dxh.pojo; public class Users { priv ...

  6. 总结day5 ---- ,字典的学习,增删改查,以及字典的嵌套, 赋值运算

    内容大纲: 一:字典的定义 二:字典的增加 >1:按照key增加,  无则增加,有则覆盖 >2:setdefault()  ,无则增加,有则不变 三:字典的删除 >1:pop()  ...

  7. SpringMVC之简单的增删改查示例（SSM整合）

    本篇文章主要介绍了SpringMVC之简单的增删改查示例(SSM整合),这个例子是基于SpringMVC+Spring+Mybatis实现的.有兴趣的可以了解一下. 虽然已经在做关于SpringMVC ...

  8. 基于springmvc、ajax，后台连接数据库的增删改查

    前言 前段时间在博客园上找了一个springmvc的例子,照着学了一下,算是对springmvc有了一个初步的了解,打一个基础,下面是链接.(我只看了博客,视频太耗时间了) 博客链接:http://w ...

  9. idea+spring4+springmvc+mybatis+maven实现简单增删改查CRUD

    在学习spring4+springmvc+mybatis的ssm框架,idea整合简单实现增删改查功能,在这里记录一下. 原文在这里:https://my.oschina.net/finchxu/bl ...

随机推荐

  1. July-程序员面试、算法研究、编程艺术、红黑树、数据挖掘5大经典原创系列集锦与总结

    程序员面试.算法研究.编程艺术.红黑树.数据挖掘5大经典原创系列集锦与总结 http://blog.csdn.net/v_july_v/article/details/6543438

  2. 3D图片采集与展示（SurfaceView 自适应 Camera, 录制视频， 抽取帧）

    最近在做一个3D图片采集与展示. 主要功能为:自定义Camera(google 已经摈弃了Camera, 推荐使用Camera2,后续篇幅,我将会用Camera2取代Camera),围绕一个物体360 ...

  3. C/C++中的隐式类型转换

    代码: #include <iostream> #include <cstdio> using namespace std; int main(int argc,char* a ...

  4. C++中的cout输出机制

    代码: #include <iostream> using namespace std; int hello(){ cout<<"hello"<< ...

  5. socket网络编程中的同步,异步,阻塞式,非阻塞式,有何联系与区别？

    一.举个打电话的例子: 阻塞   block   是指,你拨通某人的电话,但是此人不在,于是你拿着电话等他回来,其间不能再用电话.同步大概和阻塞差不多. 非阻塞   nonblock   是指,你拨通 ...

  6. [Leetcode] Remove Duplicates From Sorted Array II (C++)

    题目: Follow up for "Remove Duplicates":What if duplicates are allowed at most twice? For ex ...

  7. 表单同时有中文字段和文件上传，加上enctype="multipart/form-data"后导致的中文乱码问题

    因为一个表单需要同时上传字段和文件,所以加上enctype="multipart/form-data",但是上传后的中文字段变成了乱码. 把enctype="multip ...

  8. PHP & JAVA 实现 PBKDF2 加密算法

    PHP代码: /** * PBKDF2 加密函数 * 参考标准 * @link https://www.ietf.org/rfc/rfc2898.txt * * php官方函数将在php5.5发布 * ...

  9. Largest Rectangle in a Histogram（HDU 1506 动态规划）

    Largest Rectangle in a Histogram Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 ...

  10. VBoxManage.exe: error: Resize hard disk operation for this format is not implemented yet!

    VirtualBox虚拟磁盘空间不够了,默认10G.想扩大,图形界面下没有找到可操作菜单.Google了一下用 Vbox自带的命令工具VBoxManage即可解决. C:\Program Files\ ...