我开始学习Spring MVC。想要将Excel文件上传到数据库的Web应用程序。
我从简单的文件上传开始，并在开始时遇到问题。
我使用Maven和Tomcat 8在Netbans中创建的项目。
我用教程
制作了简单的示例项目它完美无缺，但我想根据官方的Spring帮助将其更改为文件上传
http://docs.spring.io/spring/docs/3.0.x/spring-framework-reference/html/mvc.html#mvc-multipart
我打开了文件上传表格，当我选择文件并提交时我收到了错误：
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
如何解决这个问题以及错误在哪里？这是我的代码中的错误，或者我错过了什么，或者配置错误了？
我在form.jsp文件和一个控制器类HelloController上有一个表单，为什么它不起作用？
的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">
<!-- 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/form.jsp</welcome-file>
</welcome-file-list>
</web-app>
前端控制器-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"
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="1000000"/>
</bean>
<context:component-scan base-package="helloweb"/>
</beans>
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="">
<label>file to send: <input type="file" name="file" /></label>
<input type="submit" />
</form>
</body>
</html>
HelloController.java
/*
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* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package helloweb;
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
{
private String startmessage="start";
@RequestMapping("form")
public String viewLoginPage(Model model)
{
model.addAttribute("message", startmessage);
return "form";
}
@RequestMapping(value = "form", method = RequestMethod.POST)
public String login(
@RequestParam(value = "file", required = true) MultipartFile file)
{
if((file.isEmpty()) )
{
startmessage="file empty";
return "redirect:form";
}
else
{
byte[] bytes = file.getBytes();
return "hello";
}
}
}