SpringMVC中ModelAndView addObject()设置的值jsp取不到的问题

最新推荐文章于 2025-03-07 09:15:00 发布

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最新推荐文章于 2025-03-07 09:15:00 发布

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分类专栏： SpringMVC 文章标签： spring mvc web-xml

本文链接：https://blog.youkuaiyun.com/asdfayw/article/details/53035296

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controller

public class HelloWorldController implements Controller {
    public ModelAndView handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) 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();
        //添加模型数据 可以是任意的POJO对象
        mv.addObject("message", "Hello World!!!!");
        //设置逻辑视图名，视图解析器会根据该名字解析到具体的视图页面
        mv.setViewName("hello");
        return mv;
    }
}

jsp

<%@ 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>
    <title>Hello World</title>
</head>
<body>
${message}
message=<%=request.getParameter("message")%>
</body>
</html>

web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>

  <servlet>
    <servlet-name>mymvct</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>mymvct</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

</web-app>

mymvct-servlet.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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <!-- HandlerMapping -->
    <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>

    <!-- HandlerAdapter -->
    <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>

    <!-- ViewResolver -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <property name="prefix" value="/pages/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

    <!-- 处理器 -->
    <bean name="/hello" class="cn.myspringmvct.chapter2.web.controller.HelloWorldController"/>
</beans>

在csdn论坛找到了问题的原因：maven自动生成的web.xml有问题，schema写的不对，修改后可以正确取值：
web.xml

<?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">
  <display-name>Archetype Created Web Application</display-name>

  <servlet>
    <servlet-name>mymvct</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>mymvct</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

</web-app>