菜鸟学习Spring——SpringMVC注解版前台向后台传值的两种方式.doc

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菜鸟学习Spring——SpringMVC注解版前台向后台传值的两种方式分类：菜鸟学习SSH2015-01-21 11:3410028人阅读评论(1)收藏举报一、概述。在很多企业的开法中常常用到SpringMVC+Spring+Hibernate（mybatis）这样的架构，SpringMVC相当于Struts是页面到Contorller直接的交互的框架也是界面把信息传输到Contorller层的一种架构，通过这个架构可以让我们把页面和Contorller层解耦，使得开发人员的分工更加明确。二、代码演示。 1、首先配置SpringMVC环境。 1.1导入jar。值得注意的是红色标记的commons-logging这个jar包一定得引入进去不然会报错。 1.2、xml配置文件。 web.xml [html] view plaincopyprint? 1. <?xml version="1.0" encoding="UTF-8"?> 2. <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"> 3. <servlet> 4. <servlet-name>springMVC</servlet-name> 5. <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 6. <load-on-startup>1</load-on-startup> 7. </servlet> 8. <servlet-mapping> 9. <servlet-name>springMVC</servlet-name> 10. <url-pattern>*.spring</url-pattern> 11. </servlet-mapping> 12. <welcome-file-list> 13. <welcome-file>index.jsp</welcome-file> 14. </welcome-file-list> 15. </web-app> <?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"> <servlet> <servlet-name>springMVC</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springMVC</servlet-name> <url-pattern>*.spring</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app> springMVC-servlet.xml [html] view plaincopyprint? 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" xmlns:p="http://www.springframework.org/schema/p" 4. xmlns:context="http://www.springframework.org/schema/context" 5. xsi:schemaLocation=" 6. http://www.springframework.org/schema/beans 7. http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 8. http://www.springframework.org/schema/context 9. http://www.springframework.org/schema/context/spring-context-3.0.xsd"> 10. <context:component-scan base-package="com.gaowei.controller" /> 11. </beans> <?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"> <context:component-scan base-package="com.gaowei.controller" /> </beans> 2、前台界面代码。 login.jsp [plain] view plaincopyprint? 1. <%@ page language="java" contentType="text/html; charset=UTF-8" 2. pageEncoding="UTF-8"%> 3. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 4. <html> 5. <head> 6. <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 7. <title>Insert title here</title> 8. </head> 9. <body> 10. <form action="login.spring" method="post"> 11. username:<input type="text" name="username"> 12. <br/> 13. password:<input type="text" name="password"> 14. <br/> 15. <input type="submit" value="登录"> 16. </form> 17. </body> 18. </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> <form action="login.spring" method="post"> username:<input type="text" name="username"> <br/> password:<input type="text" name="password"> <br/> <input type="submit" value="登录"> </form> </body> </html> No.jsp [html] view plaincopyprint? 1. <%@ page language="java" contentType="text/html; charset=UTF-8" 2. pageEncoding="UTF-8"%> 3. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 4. <html> 5. <head> 6. <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 7. <title>Insert title here</title> 8. </head> 9. <body> 10. No! 11. </body> 12. </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> No! </body> </html> Ok.jsp [html] view plaincopyprint? 1. <%@ page language="java" contentType="text/html; charset=UTF-8" 2. pageEncoding="UTF-8"%> 3. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 4. <html> 5. <head> 6. <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 7. <title>Insert title here</title> 8. </head> 9. <body> 10. OK！ welcome:${username} 11. </body> 12. </html> <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> OK！ welcome:${username} </body> </html> 3、Contorller层接收前台的两种方式。方式一：利用@RequestParam这个注解 [java] view plaincopyprint? 1. package com.gaowei.controller; 2. 3. import org.springframework.stereotype.Controller; 4. import org.springframework.ui.Model; 5. import org.springframework.web.bind.annotation.RequestMapping; 6. import org.springframework.web.bind.annotation.RequestParam; 7. 8. @Controller 9. public class Login { 10. 11. //方式一 12. @RequestMapping("/login") 13. public String login(@RequestParam("username") String username, 14. @RequestParam("password") String password,Model model){ 15. if (username.equals(password)) 16. { 17. model.addAttribute("username", username); 18. return "ok.jsp"; 19. } else { 20. return "no.jsp"; 21. } 22. } 23. } package com.gaowei.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 public class Login { //方式一 @RequestMapping("/login") public String login(@RequestParam("username") String username, @RequestParam("password") String password,Model model){ if (username.equals(password)) { model.addAttribute("username", username); return "ok.jsp"; } else { return "no.jsp"; } } } 方式二： [java] view plaincopyprint? 1. package com.gaowei.controller; 2. 3. import org.springframework.stereotype.Controller; 4. import org.springframework.ui.Model; 5. import org.springframework.web.bind.annotation.RequestMapping; 6. import org.springframework.web.bind.annotation.RequestParam; 7. 8. @Controller 9. public class Login { 10. @RequestMapping("/login") 11. public String login(String username,String password,Model model){ 12. if (username.equals(password)) 13. { 14. model.addAttribute("username", username); 15. return "ok.jsp"; 16. } else { 17. return "no.jsp"; 18. } 19. } 20. 21. } package com.gaowei.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 public class Login { @RequestMapping("/login") public String login(String username,String password,Model model){ if (username.equals(password)) { model.addAttribute("username", username); return "ok.jsp"; } else { return "no.jsp"; } } } 4、界面结果。第一种传值方式：第二种传值方式三、总结。这里体现出了SpringMVC传值方式的多样性满足了开发人员的不同需求。第一种用来表单的提交。第二种用来界面间相互传值，也为了方便开发人员利用AJAX。

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