springmvc Demo

時間 2019-12-01

原文原文鏈接

springmvc用於處理瀏覽器的視圖，其核心處理文件DispatcherServlet貫穿整個過程。當客戶在瀏覽器上發送請求時，DispatcherServlet截獲該處理，尋找對應的處理器映射器，該映射器再尋找對應的處理器，處理完成後返回ModelAndView對象，再由視圖解析器處理呈現出來。html

springmvc也是在servlet基礎上實現，首先配置web.xml。在其中配置DispatcherServlet，以及對應的springmvc文件，該處理器截獲的路徑。java

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app version="2.5" 
 3     xmlns="http://java.sun.com/xml/ns/javaee" 
 4     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
 5     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
 6     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
 7     
 8     <servlet>
 9         <servlet-name>smart</servlet-name>
10         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
11         <load-on-startup>1</load-on-startup>
12     </servlet>
13     <servlet-mapping>
14         <servlet-name>smart</servlet-name>
15         <url-pattern>*.html</url-pattern>
16     </servlet-mapping>
17     
18     <context-param>
19         <param-name>contextConfigLocation</param-name>
20         <param-value>classpath:applicationContext.xml</param-value>
21     </context-param>
22     
23     <listener>
24         <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
25     </listener>
26     
27 </web-app>

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xmlns:aop="http://www.springframework.org/schema/aop"
 5     xmlns:c="http://www.springframework.org/schema/c"
 6     xmlns:cache="http://www.springframework.org/schema/cache"
 7     xmlns:context="http://www.springframework.org/schema/context"
 8     xmlns:jdbc="http://www.springframework.org/schema/jdbc"
 9     xmlns:jee="http://www.springframework.org/schema/jee"
10     xmlns:lang="http://www.springframework.org/schema/lang"
11     xmlns:mvc="http://www.springframework.org/schema/mvc"
12     xmlns:p="http://www.springframework.org/schema/p"
13     xmlns:task="http://www.springframework.org/schema/task"
14     xmlns:tx="http://www.springframework.org/schema/tx"
15     xmlns:util="http://www.springframework.org/schema/util"
16     xsi:schemaLocation="http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.3.xsd
17         http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
18         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
19         http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
20         http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.3.xsd
21         http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.3.xsd
22         http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache-4.3.xsd
23         http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.3.xsd
24         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
25         http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-4.3.xsd
26         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd ">
27  
28      <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" 
29          p:prefix="/"
30          p:suffix=".jsp"
31      />
32  
33      <context:component-scan base-package="controller"></context:component-scan>
34      
35         
36 </beans>

View Code

接下來建立頁面，此頁面內實現用戶註冊功能，提交到/user.html路徑web

 1 <%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
 2 <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="utf-8">
 7 <title>用戶註冊</title>
 8 </head>
 9 <body>
10     
11     <form  method="post" action="<c:url value="/user.html" />"> 
12             <table align = "center" border="1" style="border-collapse: collapse;">
13                 <tr>
14                     <td colspan="2">用戶註冊</td>
15                 </tr>
16                 <tr>
17                     <td>用戶名：</td>
18                     <td><input type="text" name="username" /></td>
19                 </tr>
20                 <tr>
21                     <td>密碼：</td>
22                     <td><input type="password" name="username" /></td>
23                 </tr>
24                 <tr>
25                     <td class="tdstyle" colspan="2">
26                         <input type="submit" value="註冊" />
27                     </td>
28                 </tr>
29             </table>
30     </form>    
31     
32 </body>
33 </html>

DispatcherServlet尋找對應的處理器UserController.java。spring自動把用戶輸入的數據封裝到user對象中，在傳給ModelAndView，ModelAndView再傳遞封裝數據和頁面路徑，最終解析到頁面上。spring

 1 package controller;
 2 
 3 import org.springframework.stereotype.Controller;
 4 import org.springframework.web.bind.annotation.RequestMapping;
 5 import org.springframework.web.bind.annotation.RequestMethod;
 6 import org.springframework.web.servlet.ModelAndView;
 7 
 8 import dao.User;
 9 
10 @Controller
11 @RequestMapping("/user")
12 public class UserController {
13 
14     @RequestMapping(method = RequestMethod.POST)
15     public ModelAndView createUser(User user) {
16         
17         ModelAndView view = new ModelAndView();
18         view.setViewName("userlist");
19         view.addObject("user", user);
20         return view;
21     }
22     
23 }

User爲與用戶輸入的數據對應的對象瀏覽器

 1 package dao;
 2 
 3 public class User {
 4 
 5     private String username;
 6     private String password;
 7     public String getUsername() {
 8         return username;
 9     }
10     public void setUsername(String username) {
11         this.username = username;
12     }
13     public String getPassword() {
14         return password;
15     }
16     public void setPassword(String password) {
17         this.password = password;
18     }
19     
20     
21     
22 }

信息展現頁面userlist.jspspring-mvc

 1 <%@ page language="java" contentType="text/html; charset=utf-8"
 2     pageEncoding="utf-8"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="utf-8">
 7 <title>用戶列表</title>
 8 </head>
 9 <body>
10 
11   
12     用戶${user.username }建立成功
13 
14 </body>
15 </html>

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