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问Spring MVC -上载文件状态400 -所需的文件参数‘MultipartFile’不存在
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Stack Overflow用户

提问于 2016-08-30 02:41:19

回答 2查看 1.8K关注 0票数 1

我是新来的春天。我有练习，使一个网络应用程序的文件被上传，然后写入数据库。我在Netbeans中使用Spring MVC和Maven。

基于本教程，我制作了一个完全可用的basic项目

https://saarapakarinen.wordpress.com/2015/01/11/building-a-basic-spring-3-web-project-netbeans-and-maven/

并尝试为我的应用程序扩展它，想要制作基于官方Spring教程的文件上传组件

http://docs.spring.io/spring/docs/3.0.x/spring-framework-reference/html/mvc.html#mvc-multipart

但它不工作，得到一个错误：

HTTP状态400 -所需的文件参数‘MultipartFile’不存在

我已经用wyslij.jsp (上传文件的表单)扩展了这个项目

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Wysylanie pliku</title>
    </head>

<body>
    <form method="get" action="http://localhost:8084/Hello/application/wyslij" enctype="multipart/form-data">
            <input type="file" name="file"/>
            <input type="submit"/>
        </form>
</body>


</html>

并添加了用于上传文件UpladController.java的控制器

package helloweb;

import java.io.IOException;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

@Controller
public class UploadController 
{

    @RequestMapping(value = "wyslij", method = RequestMethod.GET)
    public String handleFormUpload(@RequestParam("file") MultipartFile file) throws IOException 
    {

        if (!file.isEmpty()) {
            byte[] bytes = file.getBytes();
            // store the bytes somewhere
           return "redirect:tak";
       } else 
        {
           return "redirect:nie";
       }
    }

}

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">
    <!-- name of the project//-->
    <display-name>HelloProject</display-name>
    <servlet>
        <servlet-name>front-controller</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>front-controller</servlet-name>
        <url-pattern>/application/*</url-pattern>
    </servlet-mapping>

    <!-- max time of the session //-->

    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <!-- default page //-->
    <welcome-file-list>
        <welcome-file>application/wyslij.jsp</welcome-file>
    </welcome-file-list>
</web-app>

和front-controller-serlvet.xml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"
       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">

     <!-- configuration to fetch jsp files automatically from WEB-INF/jsp -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 
        <property name="prefix" value="/WEB-INF/jsp/" /> 
        <property name="suffix" value=".jsp" /> 
    </bean>

    <bean id="multipartResolver"
    class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

    <!-- one of the properties available; the maximum file size in bytes -->
    <property name="maxUploadSize" value="100000"/>

</bean>



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

</beans>

谁能告诉我，为什么是错误，并解释一下？

编辑：

我决定使用教程中制作的form.jsp和HelloController.java，并将其转换为文件上传(它们比我的代码工作得更多)

form.jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

        <title>Form Page</title>
    </head>
    <body>

            <form method="POST" enctype="multipart/form-data" action="http://localhost:8084/Hello/application/form">
              <label>file to send: <input type="file" name="file" /></label>
              <input type="submit" />
            </form>
    </body>
</html>

和HelloController.java

package helloweb;

import java.io.IOException;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;


@Controller
public class HelloController 
{ 
    @RequestMapping(value = "form", method = RequestMethod.POST)
    public String login(@RequestParam(value = "file", required = true) MultipartFile file) throws IOException 
    {
                    if (!file.isEmpty()) 
                    {
            byte[] bytes = file.getBytes();
            // store the bytes somewhere
           return "redirect:tak";
       } 
                    else 
        {
           return "redirect:nie";
        }

    }

        @RequestMapping("form")
    public String viewLoginPage(Model model)
    {  
        return "form";
    }
}

现在我至少在起始页正确显示了文件上传表单，但在选择一个文件并单击按钮后，我得到了一个错误：

HTTP Status 500 - Could not parse multipart servlet request; nested exception is java.lang.IllegalStateException: Unable to process parts as no multi-part configuration has been provided

spring

file

maven

netbeans

upload

回答 2

Stack Overflow用户

发布于 2016-08-30 17:52:05

Chnaged和Controller现在是：

@Controller
public class UploadController 
{

    @RequestMapping(value = "wyslij", method = RequestMethod.POST)
    public String handleFormUpload(@RequestParam("file") MultipartFile file) throws IOException 
    {

        if (!file.isEmpty()) {
            byte[] bytes = file.getBytes();
            // store the bytes somewhere
           return "redirect:tak";
       } else 
        {
           return "redirect:nie";
       }
    }

}

和jsp：

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Wysylanie pliku</title>
    </head>

<body>
    <form method="post" action="http://localhost:8084/Hello/application/wyslij" enctype="multipart/form-data">
            <input type="file" name="file"/>
            <input type="submit"/>
        </form>
</body>


</html>

使用GET测试的邮递员结果测试的服务：

HTTP Status 405 - Request method 'GET' not supported

type Status report

message Request method 'GET' not supported

description The specified HTTP method is not allowed for the requested resource.

开机自检结果：

HTTP Status 400 - Required MultipartFile parameter 'file' is not present

type Status report

message Required MultipartFile parameter 'file' is not present

description The request sent by the client was syntactically incorrect.

票数 1

Stack Overflow用户

发布于 2016-08-30 11:24:55

您正在发送多部分/表单数据编码的文件，这需要Http POST。在您的控制器中，将其更改为post，如下所示。

@RequestMapping(value = "wyslij", method = RequestMethod.POST)

在您的jsp中也是如此。

 <form method="post" action="http://localhost:8084/Hello/application/wyslij" enctype="multipart/form-data">
        <input type="file" name="file"/>
        <input type="submit"/>
    </form>

票数 0

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/39213024

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