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在Struts 2中实现文件上传

2011-07-02 02:23:38


     Struts 2是通过Commons FileUpload文件上传。Commons FileUpload通过将HTTP的数据保存到临时文件夹,然后Struts使用fileUpload拦截器将文件绑定到Action的实例中。从而我们就能够以本地文件方式的操作浏览器上传的文件。                                                                                        具体实现
    前段时间Apache发布了Struts 2.0.6 GA,所以本文的实现是以该版本的Struts作为框架的。以下是例子所依靠类包的列表: 清单1 依靠类包的列表
首先,创建文件上传页面FileUpload.jsp,内容如下:<% @ page language = " Java " contentType = " text/Html; charset=utf-8 " pageEncoding = " utf-8 " %> <% @ taglib prefix = " s " uri = " /struts-tags " %>
<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" > < html XMLns ="http://www.w3.org/1999/xhtml" > < head >     < title > Struts 2 File Upload </ title > </ head > < body >     < s:form action ="fileUpload" method ="POST" enctype ="multipart/form-data" >         < s:file name ="myFile" label ="Image File" />         < s:textfield name ="caption" label ="Caption" />                < s:submit />     </ s:form > </ body > </ html >
清单2 FileUpload.jsp 在FileUpload.jsp中,先将表单的提交方式设为POST,然后将enctype设为multipart/form-data,这并没有什么非凡之处。接下来,<s:file/>标志将文件上传控件绑定到Action的myFile属性。
其次是FileUploadAction.java代码:
 package tutorial;
 import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.InputStream; import java.io.OutputStream; import java.util.Date;
 import org.apache.struts2.ServletActionContext;
 import com.opensymphony.xwork2.ActionSupport;
 public class FileUploadAction extends ActionSupport  {