java - 如何使用 Struts2 提交带有文件和文本字段的多部分/表单数据？

Question

此注册表单包含文件上传和文本字段。使用Struts2我们如何提交表单参数并上传文件？

1. register.jsp :

<s:form action = "Register" enctype="multipart/form-data" method="post">
    <s:textfield name="uname" label = "User Name"/>  
    <s:password name ="password" label = "Password"/>
    <s:file name="fileUpload" label="Select a File to upload" size="40" />
    <s:submit/> 
</s:form>

2。 RegisterAction :

package user.action;

import java.io.File;

public class RegisterAction 
{
    private String uname,password;
    private File fileUpload;
    private String fileUploadContentType;
    private String fileUploadFileName;

    //getter setters

    public String execute() throws Exception
    {
        return "success";
    }
}

3。 struts.xml :

</action>
<action name="Register" class="user.action.RegisterAction">
    <interceptor-ref name="fileUpload">
        <param name="allowedTypes">text/plain</param>
        <param name="maximumSize">10240</param>
    </interceptor-ref> 
    <result name="success">registered.jsp</result>
</action>

4. registered.jsp :

User Name    : <s:property value="uname"/>
File Name    : <s:property value="fileUploadFileName"/> 
Content Type : <s:property value="fileUploadContentType"/> 
File         : <s:property value="fileUpload"/> 

用户名<s:property value="uname"/>没有给出任何输出 registered.jsp .我们是否应该使用 Apache 文件上传来解析请求以获取文本字段值？

Answer 1

不，你不应该。 Apache 文件上传是Struts2 的一部分。 fileUpload 拦截器已包含在 defaultStack 中，因此您无需在操作配置中引用它。如果你想覆盖这个拦截器的参数，那么

<action name="Register" class="user.action.RegisterAction">
    <interceptor-ref name="defaultStack">
        <param name="fileUpload.allowedTypes">text/plain</param>
        <param name="fileUpload.maximumSize">10240</param>
    </interceptor-ref> 
    <result name="success">registered.jsp</result>
</action>

As long as the required libraries are added to your project you will be able to take advantage of of the Struts 2 fileUpload capability.