spring mvc hello

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发布于 2024-12-17 11:20:25

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代码可运行

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代码可运行

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"?>
<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"
  xsi:schemaLocation="http://www.springframework.org/schema/beans 
  http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

  <!-- 在spring中配置HandlerMapping、HandlerAdapter -->
  <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean>
  <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>
  <!-- ViewResolver -->
  <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.控制器代码;

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.收集参数，验证参数；
    //2.绑定参数到命令对象；
    //3.将命令对象传入业务对象，进行业务处理；
    //4.选择下一个页面;
    ModelAndView mv=new ModelAndView();
    //添加模型和数据可以是任意的POJO对象;
    mv.addObject("message","hello world"); //这是数据，相当于model
    //设置逻辑视图名，视图解析器会根据名字，将之解析到具体的视图页面;//设置view
    mv.setViewName("hello");
    return mv;
  }

}

4.前端页面

<%@ 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">
  <!--
  <link rel="stylesheet" type="text/css" href="styles.css">
  -->
  </head>

  <body>
    <!-- 这是创建的hello.jsp页面 ;message:相当于我们的设置属性-->
    ${message }
  </body>
</html>

使用注解的话，