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org.apache.struts2.interceptor
类 FileUploadInterceptor

java.lang.Object
  继承者 com.opensymphony.xwork2.interceptor.AbstractInterceptor
      继承者 org.apache.struts2.interceptor.FileUploadInterceptor
所有已实现的接口：
com.opensymphony.xwork2.interceptor.Interceptor, Serializable
public class FileUploadInterceptor
extends com.opensymphony.xwork2.interceptor.AbstractInterceptor

Interceptor that is based off of MultiPartRequestWrapper, which is automatically applied for any request that includes a file. It adds the following parameters, where [File Name] is the name given to the file uploaded by the HTML form:

You can get access to these files by merely providing setters in your action that correspond to any of the three patterns above, such as setDocument(File document), setDocumentContentType(String contentType), etc.
See the example code section.

This interceptor will add several field errors, assuming that the action implements ValidationAware. These error messages are based on several i18n values stored in struts-messages.properties, a default i18n file processed for all i18n requests. You can override the text of these messages by providing text for the following keys:

Interceptor parameters:

Extending the interceptor:

You can extend this interceptor and override the acceptFile method to provide more control over which files are supported and which are not.

Example code: 

 
 <action name="doUpload" class="com.example.UploadAction">
     <interceptor-ref name="fileUpload"/>
     <interceptor-ref name="basicStack"/>
     <result name="success">good_result.jsp</result>
 </action>

You must set the encoding to multipart/form-data in the form where the user selects the file to upload. 

 
   <s:form action="doUpload" method="post" enctype="multipart/form-data">
       <s:file name="upload" label="File"/>
       <s:submit/>
   </s:form>

And then in your action code you'll have access to the File object if you provide setters according to the naming convention documented in the start. 

 
    package com.example;

    import java.io.File;
    import com.opensymphony.xwork2.ActionSupport;

    public UploadAction extends ActionSupport {
       private File file;
       private String contentType;
       private String filename;

       public void setUpload(File file) {
          this.file = file;
       }

       public void setUploadContentType(String contentType) {
          this.contentType = contentType;
       }

       public void setUploadFileName(String filename) {
          this.filename = filename;
       }

       public String execute() {
          //...
          return SUCCESS;
       }
  }

另请参见：
序列化表格

构造方法摘要
FileUploadInterceptor()
           
 
方法摘要
 String intercept(com.opensymphony.xwork2.ActionInvocation invocation)
           
 void setAllowedExtensions(String allowedExtensions)
          Sets the allowed extensions
 void setAllowedTypes(String allowedTypes)
          Sets the allowed mimetypes
 void setContainer(com.opensymphony.xwork2.inject.Container container)
           
 void setMatcher(com.opensymphony.xwork2.util.PatternMatcher matcher)
           
 void setMaximumSize(Long maximumSize)
          Sets the maximum size of an uploaded file
 
从类 com.opensymphony.xwork2.interceptor.AbstractInterceptor 继承的方法
destroy, init
 
从类 java.lang.Object 继承的方法
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

构造方法详细信息

FileUploadInterceptor

public FileUploadInterceptor()
方法详细信息

setMatcher

public void setMatcher(com.opensymphony.xwork2.util.PatternMatcher matcher)

setContainer

public void setContainer(com.opensymphony.xwork2.inject.Container container)

setAllowedExtensions

public void setAllowedExtensions(String allowedExtensions)
Sets the allowed extensions

参数：
allowedExtensions - A comma-delimited list of extensions

setAllowedTypes

public void setAllowedTypes(String allowedTypes)
Sets the allowed mimetypes

参数：
allowedTypes - A comma-delimited list of types

setMaximumSize

public void setMaximumSize(Long maximumSize)
Sets the maximum size of an uploaded file

参数：
maximumSize - The maximum size in bytes

intercept

public String intercept(com.opensymphony.xwork2.ActionInvocation invocation)
                 throws Exception
指定者：
接口 com.opensymphony.xwork2.interceptor.Interceptor 中的 intercept
指定者：
类 com.opensymphony.xwork2.interceptor.AbstractInterceptor 中的 intercept
抛出：
Exception
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