【发布时间】：2014-07-04 09:22:47
【问题描述】：
我正在使用 Spring MVC 和 JQUERY 来实现将数据从表单提交到服务器的两步流程：
JQUERY ajax POST 请求会在点击文件浏览时将文件数据从表单提交到服务器。这会将文件存储在文件服务器上，并在存储文件信息的数据库中创建一个条目，模式设置为草稿。
当用户点击表单提交按钮时，其他表单数据，如“文件标题”等，将被提交到服务器。进入数据库的条目现在应该将模式设置为“完成”。
在第 1 步中，我将文件数据（例如数据库中列的 Id、文件名）设置为会话属性。
/**
* Upload single file using Spring Controller
*/
@RequestMapping(value = "/uploadFileDraft", method = RequestMethod.POST)
@ResponseStatus(value = HttpStatus.OK)
public void uploadFileDraft(@RequestParam("file") MultipartFile file,Model map, HttpSession httpSession) {
PostDto draftPost = new PostDto();
draftPost.setPostedDate(new Date());
draftPost.setStrRawFileName(file.getOriginalFilename());
//Logic to save this object into database.
postService.uploadPostDraft(draftPost);
//now set the data into session object
httpSession.setAttribute("filePostDraftDto", draftPost);
}
现在在第 2 步中，我尝试从会话中检索此 Dto 对象并调用另一个服务。但他的对象不存在于会话中。
@RequestMapping(value = "/uploadFilePublish", method = RequestMethod.POST)
@ResponseStatus(value = HttpStatus.OK)
public void uploadVideoPublish(@RequestParam("strVideoTitle") String strVideoTitle, Model map, HttpSession httpSession) {
PostDto postDtoDraft = null;
if(null!= httpSession.getAttribute("filePostDraftDto"))
{
postDtoDraft = (PostDto)httpSession.getAttribute("filePostDraftDto");
}
if(null!=postDtoDraft )
{
System.out.println("file name from session is: "+postDtoDraft.getStrFileName());
}
else
{
System.out.println("error: postDtoDraft is null");
}
}
}
每次都会打印以下内容：error: postDtoDraft is null
我的 web.xml 是：
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="3.0"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
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_3_0.xsd">
<display-name>WebConnect</display-name>
<!-- Spring Security Configuration File -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring-security.xml</param-value>
</context-param>
<!-- Creates the Spring Container shared by all Servlet and Filters -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<listener>
<listener-class>org.springframework.security.web.session.HttpSessionEventPublisher</listener-class>
</listener>
<filter>
<filter-name>springSecurityFilterChain</filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>
<filter-mapping>
<filter-name>springSecurityFilterChain</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<servlet>
<servlet-name>mvc-dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>mvc-dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.htm</welcome-file>
</welcome-file-list>
<!-- session time out set as 30 minites -->
<session-config>
<session-timeout>30</session-timeout>
</session-config>
applicationConfig.xml 是：
<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:tx="http://www.springframework.org/schema/tx" xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
<context:annotation-config />
<context:component-scan base-package="com.mycomp.myproj" />
<context:spring-configured />
<neo4j:config graphDatabaseService="graphDatabaseService" />
<neo4j:repositories base-package="com.mycomp.myproj.repository" />
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/jsp/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- setting maximum upload size -->
<property name="maxUploadSize" value="10000000000" />
</bean>
<mvc:resources mapping="/resources/**" location="/resources/" />
<mvc:default-servlet-handler />
<mvc:annotation-driven />
<tx:annotation-driven mode="aspectj"
transaction-manager="transactionManager" />
spring-security.xml 是：
<beans:beans xmlns="http://www.springframework.org/schema/security"
xmlns:beans="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-3.0.xsd
http://www.springframework.org/schema/security
http://www.springframework.org/schema/security/spring-security.xsd">
<http pattern="/resources/**" security="none" />
<http authentication-manager-ref="userAuthManager">
<intercept-url pattern="/" access="IS_AUTHENTICATED_ANONYMOUSLY" />
<intercept-url pattern="/login" access="IS_AUTHENTICATED_ANONYMOUSLY" />
<intercept-url pattern="/register" access="IS_AUTHENTICATED_ANONYMOUSLY" />
<intercept-url pattern="/**" access="ROLE_USER" />
<form-login login-page='/' authentication-failure-url="/" />
<logout invalidate-session="true" logout-success-url="/" logout-url="/j_spring_security_logout" />
<session-management invalid-session-url="/">
<concurrency-control max-sessions="1"
expired-url="/" />
</session-management>
</http>
<beans:bean id="userAuthManager" class="com.inw.pyt.security.UserAuthManager">
</beans:bean>
<beans:bean id="passwordEncoder"
class="org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder" />
【问题讨论】：
-
你能看到 JSESSIONID 设置了吗？如果您在点击
uploadVideoPublish方法后打印会话中的所有属性，您看到您的属性和值了吗？为什么对postService.uploadPostDraft();的调用不带参数？似乎应该把你的draftPost保存起来。 -
正确， postService.uploadPostDraft() 应该接受参数。我只是在发布我的问题时错过了它。相应地编辑了问题。当我打印所有属性时，它不会显示我的属性甚至 JSESSIONID。
-
JSESSIONID 将是一个 cookie 或可能是一个 GET 参数。如果您在设置会话变量后立即打印它，您会在那里看到它吗？
标签： spring spring-mvc spring-security httpsession