jsp的request.getParameter获取不到表单参数

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"";
    }

评论

1 楼 yuyee 2011-03-24  

哥们，非常感谢你，哥刚碰到第三种问题，我说怎么debug 的时候fileitem里可以 拿到值