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spring mvc hello

發布時間：2024/1/23 c/c++ 23 豆豆

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1.配置web.xml文件

<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"><welcome-file-list><welcome-file>index.jsp</welcome-file></welcome-file-list><servlet><servlet-name>hello</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><load-on-startup>1</load-on-startup><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:spring-servlet-config.xml</param-value></init-param></servlet><servlet-mapping><servlet-name>hello</servlet-name><url-pattern>/</url-pattern></servlet-mapping> </web-app>

2.配置spring-servlet-config.xml

<?xml version="1.0" encoding="UTF-8"?> <beansxmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:p="http://www.springframework.org/schema/p"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"><bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean><bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="viewClass" value="org.springframework.web.servlet.view.JstlView"></property><property name="prefix" value="/"></property><property name="suffix" value=".jsp"></property></bean><bean name="/hello" class="com.controller.HelloController"></bean> </beans>

3.控制器代碼;

package com.controller;import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.ModelAndView; import org.springframework.web.servlet.mvc.Controller;public class HelloController implements Controller {public ModelAndView handleRequest(HttpServletRequest arg0,HttpServletResponse arg1) throws Exception {//1.收集參數，驗證參數；//2.綁定參數到命令對象；//3.將命令對象傳入業務對象，進行業務處理；//4.選擇下一個頁面;ModelAndView mv=new ModelAndView();//添加模型和數據可以是任意的POJO對象;mv.addObject("message","hello world"); //這是數據，相當于model//設置邏輯視圖名，視圖解析器會根據名字，將之解析到具體的視圖頁面;//設置viewmv.setViewName("hello");return mv;}}

4.前端頁面

<%@ page language="java" import="java.util.*" 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"> <html><head><base href="<%=basePath%>"><title>My JSP 'index.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"></head><body>${message }</body> </html>

使用注解的話，

SpringMVC 的注解和 XML 沖突的問題

There?is?already?handler?of?type?[class?com.sdemo.controller.Login]?mapped.原因在于spring配置文件中和控制器注解都定義過了。

@Controller
public class HelloController {

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