jsp的request.getParameter获取不到表单参

可能原因:

1: form表单中的控件没有定义name属性

2: form表单中的控件被设置成disabled

3: form表单的enctype="multipart/form-data"是一种用于上传文件的表单

解决方法:

对于第三种情况我们直接request.getParameter来取参数值是取不到的

我们可以借用apache的上传组件来解决

用到jar包commons-fileupload-1.1.1.jar

import org.apache.commons.fileupload.FileItem;

import org.apache.commons.fileupload.FileItemFactory;

import org.apache.commons.fileupload.FileUploadException;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

    /**

     *获取各种类型表单的表单参数

     *@paramrequest HttpServletRequest请求对像

     * @paramparamName 参数名

     *@return

     *@throwsFileUploadException

     */

    publicstatic String getParameterValue(HttpServletRequest request,String paramName) throws FileUploadException{

    boolean isMultipart = ServletFileUpload.isMultipartContent(request);

    if(isMultipart==true){

        FileItemFactory factory = new DiskFileItemFactory();

        ServletFileUpload upload = new ServletFileUpload(factory);

        List fileItemList = upload.parseRequest(request);

        if(fileItemList!=null){

           for(Iterator itr=fileItemList.iterator();itr.hasNext();){

               FileItem fileItem = (FileItem)itr.next();

               if(fileItem.getFieldName().equalsIgnoreCase(paramName)){

                   return new String(fileItem.getString().getBytes("ISO8859-1"))//中文转码

               }

           }

        }

    }else{

        return new String(request.getParameter(paramName).getBytes("ISO8859-1"))//中文转码

    }

    return"";

    }

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