Question

我要求从文件系统获取图像并在浏览器中显示它。我迄今为止尝试过的代码如下所示：

.jsp代码：

<formspring:form enctype="multipart/form-data" modelAttribute="onlinePurchase">
   Please select a file to upload : <input type="file" name="multipartFileUpload" id="multipartFileUpload" />
   <div class="submit">
        <input type="submit" id="upload" name="_eventId_upload"
            value="Upload Image" />
        </div>
 </formspring:form>

控制器代码：

  public void saveImage(OnlinePurchase onlinepurchase,
        MultipartFile multipartFile) {

    try {
        onlinepurchase.setContent(multipartFile.getBytes());
    } catch (IOException e) {
        e.printStackTrace();
    }
    onlinepurchase.setContentSize(new Long(multipartFile.getSize())
            .intValue());
    onlinepurchase.setContentType(multipartFile.getContentType());
    onlinepurchase.setFilename(multipartFile.getOriginalFilename());

}

flow.xml代码：

 <view-state id="onlinePurchaseStep1" view="onlinepurchase/onlinepurchaserequest-step-1"
    model="onlinePurchase">

    <on-render>
        <evaluate expression="oPAction.initialize" />
    </on-render>
    <transition on="submit" to="onlinePurchaseStep1" validate="false">
        <evaluate expression="oPAction.cropImage" />
    </transition>
    <transition on="upload" to="onlinePurchaseStep1" validate="false">
        <evaluate
    expression="oPAction.saveImage(onlinePurchase,requestParameters.multipartFileUpload)"
            result="" result-type="" />
    </transition>
    <transition on="success" to="onlinePurchaseStep2">
        <evaluate expression="oPAction.addMedia" />
    </transition>

    <transition on="cancel" to="login" validate="false" />
</view-state>

问题是没有调用saveImage（OnlinePurchase onlinepurchase，String multipartFile）方法。任何建议都表示赞赏。

Answer 1

你需要一个MultipartResolver：在spring的webmvc xml配置文件中添加此行。

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

请注意，CommonsMultipartResolver使用org.apache.commons.io包中的类，因此您可能需要在类路径中添加commons-io.jar。如果你的项目是maven，你可以在pom中添加以下依赖项：

     <dependency> 
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-io</artifactId> 
        <version>a valid version</version> <!-- 2.4 worked for me -->
     </dependency>

在spring webflow中上传图片并在浏览器中显示

1 个答案: