SpringMVC重定向传递参数

在SpringMVC的一个controller中要把参数传到页面，只要配置视图解析器，把参数添加到Model中，在页面用el表达式就可以取到。但是，这样使用的是forward方式，浏览器的地址栏是不变的，如果这时候浏览器F5刷新，就会造成表单重复提交的情况。所以，我们可以使用重定向的方式，改变浏览器的地址栏，防止表单因为刷新重复提交。

WEB-INF下web.xml文件：

<!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>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>/</url-pattern>

    </servlet-mapping>

</web-app>

WEB-INF下springmvc-servlet文件：

<?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:context="http://www.springframework.org/schema/context"

       xmlns:mvc="http://www.springframework.org/schema/mvc"

       xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd

       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd

       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd">

    <mvc:annotation-driven />

    <context:component-scan base-package="com" />

    <bean id="irViewResolver"

        class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <property name="prefix" value="/page/" />

        <property name="suffix" value=".jsp" />

</beans>

*视图定位：作用是把视图约定在 webapp/page/*.jsp 这个位置

JSP文件：

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8" isELIgnored="false"%>

<h1>${message}</h1>

<form action="addProduct">

    产品名称 ：<input type="text" name="name" value=""><br />

    产品价格： <input type="text" name="price" value=""><br />

    <input type="submit" value="增加商品">

</form>

Controller：

package com;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.ModelAttribute;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import pojo.Product;

@Controller

public class IndexController{

    @RequestMapping("/addProduct")

    public String add(Product product, RedirectAttributes model){

        model.addFlashAttribute("name", product.getName());

        return "redirect:/showProduct";

    }

    @RequestMapping("/showProduct")

    public String show(@ModelAttribute("name") String name, Model model){

        System.out.println(name);

        model.addAttribute("name", name);

        return "show";

    }

}

*自动装箱：add方法里面准备一个Product参数，会自动获取表单提交数据

package pojo;

public class Product {

    private int id;

    private String name;

    private float price;

    public int getId() {

        return id;

    }

    public void setId(int id) {

        this.id = id;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public float getPrice() {

        return price;

    }

    public void setPrice(float price) {

        this.price = price;

    }

}

出现的问题：

java.lang.IllegalStateException: Argument [RedirectAttributes] is of type Model or Map but is not assignable from the actual model. You may need to switch newer MVC infrastructure classes to use this argument.

解决：在springmvc-servlet.xml中

<?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:context="http://www.springframework.org/schema/context"

xmlns:mvc="http://www.springframework.org/schema/mvc"

xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd

http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd

http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd">

并加上这个标签：<mvc:annotation-driven />

巴特西

SpringMVC重定向传递参数

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