Struts2文件上传 —— 单个文件上传

注意：enctype属性
<s:formaction="/upload"method="POST"enctype="multipart/form-data">
<s:filelabel="选择文件："name="file"/>
<s:submitvalue="上传"/>
</s:form>

<package name="default" namespace="/" extends="struts-default">
    <action name="upload" class="cn.itcast.user.action.FileUploadAction" method="upload">
       <param name="filePath">d:/</param>
       <result name="input">/jsp/fail/upload_fail.jsp</result>
       <result>/jsp/success/upload_success.jsp</result>
    </action>
</package>

public class FileUploadAction extends ActionSupport {
    // 上传文件对象，该属性必须符合特定规范，即与表单提交name相同
    private File file;
    // 上传文件的MIME类型
    private String fileContentType;
    // 上传文件的文件名
    private String fileFileName;
    // 上传至指定路径,该参数值由struts.xml配置
    private String uploadPath;

    public String upload() throws Exception {
       OutputStream os = null;
       InputStream is = null;
       try {
        os = new FileOutputStream(uploadPath+fileFileName);
           is = new FileInputStream(file);
           byte[] buffer = new byte[1024];
           int len = -1;
           while ((len = is.read(buffer)) != -1) {
              os.write(buffer, 0, len);
        }
        } catch (Exception e) {
           e.printStackTrace();
        }finally{
           if(os!=null)
               os.close();
           if(is!=null)
               is.close();
           if(file!=null)
              is.close();
       }
       return SUCCESS;
    }
}