`

ognl.MethodFailedException

阅读更多

          图片上传错误提示的部分源码:

          Error setting expression 'image' with value '[Ljava.lang.String;@c78e02'
          ognl.MethodFailedException: Method "setImage" failed for object 
com.graduateInfo.action.attachment.AttachmentAction@4577f9 [java.lang.NoSuchMethodException: com.graduateInfo.action.attachment.AttachmentAction.setImage([Ljava.lang.String;)]。

          异常提示:[Struts2框架无法从我的setImage()方法中获得image这个值]

...

/-- Encapsulated exception ------------\

 

          再仔细看JSP页面:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<
%@taglib prefix="s" uri="/struts-tags"%>
<%
 String path = request.getContextPath();
 String basePath = request.getScheme() + "://"
   + request.getServerName() + ":" + request.getServerPort()
   + path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
  <base href="<%=basePath%>">

  <title>My JSP 'personal_image_upload.jsp' starting page</title>

  <meta http-equiv="pragma" content="no-cache">
  <meta http-equiv="cache-control" content="no-cache">
  <meta http-equiv="expires" content="0">
  <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
  <meta http-equiv="description" content="This is my page">
  <link rel="stylesheet" type="text/css"
   href="<%=basePath%>css/table/tableCss.css">
  <script type="text/javascript"
   src="<%=basePath%>js/jquery/jquery-1.7.2.min.js"></script>
 </head>
 <script type="text/javascript">
  
          function uploadImage(){
                  
                  var filePath=$("#image").val();
                  var reg=/\.gif|jpg|jpeg|png|bmp$/;
                  if(filePath==''){
                     alert('上传的图片不能为空!');
                  }else if(!reg.test(filePath)){
                     alert('请导入正确的图片!');
                  }else{                                                         
                     $('#ff').submit();  
                  }               
          }
         
</script>
 <body>
  
<form id="ff"  action="attachment/attachmentAction!saveUserImage.action"
   enctype="multipart/form-data">
   <br />
   <br />
   上传图片:
   <s:file name="image" id="image"></s:file>
   <input type="button" value="上传" onclick="uploadImage();" />
  </form>
  <div style="background: #FAFBDD; padding: 3px;" id="uploadImageMsg" align="center">
   <font color="red">${sessionScope.uploadImageMsg}</font>
  </div>
  
 </body>
</html>

            控制层部分源码:

            public   class  AttachmentAction  extends  ActionSupport {

                        /**
                         * 导入的图片
                         */
                         private File image;
                         /**
                          * 导入的图片名称                         

                          */
                         private String imageFileName;
                           /**
                            * 导入的图片类型                           

                            */
                          private String imageContentType;

 

                         //......

      }

 

        纠错结果:

        造成这个错误的原因有1)第一个错误是要实现文件上传的jsp里面的form元素的ectype没有设置成:enctype="multipart/form-data" ;2)第二个错误也是很多人没有注意的,就是我们的form提交方法应该是method="post"。而且关键还是这个method,纠正后的表单设置为:<form id="ff"  method="post" action="attachment/attachmentAction!saveUserImage.action"
   enctype="multipart/form-data">

         分析:

         enctype="multipart/form-data" 表示文件提交的内容是二进制的,可以很好的处理照片。而且get方法是要附加在link后面去提交的,因而提交的都是String。所以应该选择使用post(头传输)。但是也应该注意,使用post传输,更安全更高效。

 

分享到:
评论
1 楼 wenbing2610 2012-10-05  

相关推荐

Global site tag (gtag.js) - Google Analytics