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解決當(dāng)FORM的ENCTYPE="multipart/form-data" 時request.getParameter()獲取不到值的方法

Situation(原因):
javax.servlet.HttpServletRequest.getParameter(String) returns null when the ContentType is multipart/form-data

Solutions(解決辦法):

Solution A:

1. download http://www.servlets.com/cos/index.html
2. invoke getParameters() on com.oreilly.servlet.MultipartRequest

Solution B:

    1. download http://jakarta.apache.org/commons/fileupload/
    2. invoke readHeaders() in org.apache.commons.fileupload.MultipartStream
    Or
    1. Invoke parseRequest(request) on org.apache.commons.fileupload.FileUploadBase which returns list of org.apache.commons.fileupload.FileItem objects.
   2. Invoke isFormField() on each of the FileItem objects. This determines whether the file item is a form paramater or stream of uploaded file.
   3. Invoke getFieldName() to get parameter name and getString() to get parameter value on FileItem if it's a form parameter. Invoke write(java.io.File) on FileItem to save the uploaded file stream to a file if the FileItem is not a form parameter.

Solution C:

1. download http://users.boone.net/wbrameld/multipartformdata/
2. invoke getParameter on com.bigfoot.bugar.servlet.http.MultipartFormData

Solution D:

Use Struts. Struts 1.1 handles this automatically.

posted on 2008-03-26 10:38 梁健閱讀(2731) 評論(2) 編輯收藏所屬分類: jsp/servlet

Feedback

# re: 解決當(dāng)FORM的ENCTYPE="multipart/form-data" 時request.getParameter()獲取不到值的方法 2009-03-03 10:52 fd

沒人看的懂你說的。。。要么就別寫回復(fù) 更多評論

# re: 解決當(dāng)FORM的ENCTYPE="multipart/form-data" 時request.getParameter()獲取不到值的方法 2012-05-18 17:30 路人甲

smartupload.getRequest().getParameter("cwname")這樣就可以了回復(fù) 更多評論

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On The Way

解決當(dāng)FORM的ENCTYPE="multipart/form-data" 時request.getParameter()獲取不到值的方法

Feedback

# re: 解決當(dāng)FORM的ENCTYPE="multipart/form-data" 時request.getParameter()獲取不到值的方法 2009-03-03 10:52 fd

# re: 解決當(dāng)FORM的ENCTYPE="multipart/form-data" 時request.getParameter()獲取不到值的方法 2012-05-18 17:30 路人甲

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