SpringMVC的一個登陸小案例
準備工作
- 創建一個Dynamic Web Project(本人是Eclipse)
- 添加相關的jar包,構建路徑
- 創建springMVC-servlet.xml,及完善web.xml
- 創建代碼邏輯
目錄結構如下
對于新手而言,有一個項目的完整的目錄結構是多么幸福的一件事啊。
目錄結構
個人建議:注意其中的springMVC-servlet.xml的位置。以及源代碼包的名稱。
代碼實戰
首先是大管家,web.xml:
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<?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>SpringTest</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> </welcome-file-list> <servlet> <servlet-name>springMVC</servlet-name> <servlet- class >org.springframework.web.servlet.DispatcherServlet</servlet- class > </servlet> <servlet-mapping> <servlet-name>springMVC</servlet-name> <url-pattern>*.spring</url-pattern> </servlet-mapping> </web-app> |
然后是小管家springMVC-servlet.xml:
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<? xml version = "1.0" encoding = "UTF-8" ?> < beans xmlns = "http://www.springframework.org/schema/beans" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xmlns:p = "http://www.springframework.org/schema/p" xmlns:context = "http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd"> <!-- 最簡單的配置,讓Spring自己去探索--> < context:component-scan base-package = "controller" ></ context:component-scan > </ beans > |
再就是一個登陸界面了,login.jsp:
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<%@ 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>登陸界面</title> </head> <body> <form action= "login.spring" method= "post" > username:<input type= "text" name= "username" ><br /> Password:<input type= "password" name= "password" ><br /> <input type= "submit" value= "登陸" > </form> </body> </html> |
login.jsp對應的那個action就是要進行處理的后臺頁面,也就是我們的Login.Java:
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package controller; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; @Controller // @Controller 代表本Java類是controller控制層 public class Login { /** * @RequestParam注解的作用是:根據參數名從URL中取得參數值 * @param username * 用戶名,一定要對應著表單的name才行 * @param password * 用戶密碼,也應該對應表單的數據項 * @param model * 一個域對象,可用于存儲數據值 * @return */ @RequestMapping ( "/login" ) // @RequestMapping 注解可以用指定的URL路徑訪問本控制層 public String login( @RequestParam ( "username" ) String username, @RequestParam ( "password" ) String password, Model model) { if (username.equals( "admin" ) && password.equals( "admin" )) { model.addAttribute( "username" , username); return "ok.jsp" ; } else { model.addAttribute( "username" , username); return "no.jsp" ; } } } |
最后就是ok.jsp和no.jsp了:
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<%@ 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> <body> <font color= "green" >${username } </font>歡迎你! </body> </html> <%@ page language= "java" contentType= "text/html; charset=UTF-8" pageEncoding= "UTF-8" %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd" > <html> <head> <meta http-equiv= "Content-Type" content= "text/html; charset=UTF-8" > <title>Insert title here</title> </head> <body> <font color= "red" >Sorry</font>,沒有${username }這個用戶! <br /> <a href= "login.jsp" rel= "external nofollow" >重試一下!</a> </body> </html> |
測試
在你的瀏覽器上輸入http://localhost:8080/SpringTest/login.jsp
然后就可以對代碼進行測試了。本人親測好用,這里就不再貼圖了。
總結
- 在web.xml中配置DispatcherServlet核心控制器
- 在WEB-INF文件夾中創建springMVC-servlet.xml配置文件
- @Controller、@RequestMapping、@RequestParam以及Model域對象等的使用
- 表單以post方式,或者使用get方式都是可以的
下面是注解的小技巧:
@Controller就是對應于springMVC-servlet.xml中的
感謝閱讀,希望能幫助到大家,謝謝大家對本站的支持!
原文鏈接:http://blog.csdn.net/marksinoberg/article/details/51482079