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>

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