表单form的enctype="multipart/form-data"使用体会

xyz — Fri, 14 Mar 2008 02:52:00 GMT

by xyz

在��用表单传送数据的时候，如果form 加了enctype="multipart/form-data" �q�个属性，那么表单��h��传到另一个jsp或servlet 里时
是不能用request.getParameter()来获取到各个表单元素的值的�?br /> 可以通用�q�样(上传�l��g提供的API)�Q?br />

boolean isMultipart = ServletFileUpload.isMultipartContent(request);
if (isMultipart) {
// Create a factory for disk-based file items
org.apache.commons.fileupload.FileItemFactory factory = new DiskFileItemFactory();

  // Create a new file upload handler
  ServletFileUpload upload = new ServletFileUpload(factory);
  // Parse the request
  List /* FileItem */items = upload.parseRequest(request);

  // Process the uploaded items
  Iterator iter = items.iterator();

  while (iter.hasNext()) {
   org.apache.commons.fileupload.FileItem item = (org.apache.commons.fileupload.FileItem) iter
     .next();
   if (item.isFormField()) {
    String name = item.getFieldName();
    String value = item.getString("GBK");
    //out.println(name + "=" + value);
    params.put(name.toUpperCase(), value.trim());
   } ......
===============================================================================
使用multipart/form-data上传�Ӟ��发送的��h��和一般的http不一��P��需要�{化后才能��d��他参数�?

如果你用spring,它提供一个MultiRequestResolver�Q�只需要：
MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
然后��p��正常��d��参数�Q?
multipartRequest.getParameter("xxx");

以下是spring的处理方法，必须首先安装commons-fileupload�l��g�Q?

public MultipartHttpServletRequest resolveMultipart(HttpServletRequest request) throws MultipartException {
DiskFileUpload fileUpload = this.fileUpload;
String enc = determineEncoding(request);

// use prototype FileUpload instance if the request specifies
// its own encoding that does not match the default encoding
if (!enc.equals(this.defaultEncoding)) {
fileUpload = new DiskFileUpload();
fileUpload.setSizeMax(this.fileUpload.getSizeMax());
fileUpload.setSizeThreshold(this.fileUpload.getSizeThreshold());
fileUpload.setRepositoryPath(this.fileUpload.getRepositoryPath());
fileUpload.setHeaderEncoding(enc);
}

try {
List fileItems = fileUpload.parseRequest(request);
Map parameters = new HashMap();
Map multipartFiles = new HashMap();
for (Iterator it = fileItems.iterator(); it.hasNext();) {
FileItem fileItem = (FileItem) it.next();
if (fileItem.isFormField()) {
String value = null;
try {
value = fileItem.getString(enc);
}
catch (UnsupportedEncodingException ex) {
logger.warn("Could not decode multipart item '" + fileItem.getFieldName() +
"' with encoding '" + enc + "': using platform default");
value = fileItem.getString();
}
String[] curParam = (String[]) parameters.get(fileItem.getFieldName());
if (curParam == null) {
// simple form field
parameters.put(fileItem.getFieldName(), new String[] { value });
}
else {
// array of simple form fields
String[] newParam = StringUtils.addStringToArray(curParam, value);
parameters.put(fileItem.getFieldName(), newParam);
}
}
else {
// multipart file field
CommonsMultipartFile file = new CommonsMultipartFile(fileItem);
multipartFiles.put(file.getName(), file);
if (logger.isDebugEnabled()) {
logger.debug("Found multipart file [" + file.getName() + "] of size " + file.getSize() +
" bytes with original filename [" + file.getOriginalFilename() + "], stored " +
file.getStorageDescription());
}
}
}
/***** 注意 parameters ��是普通的text之类的字�D늚��? *****/
return new DefaultMultipartHttpServletRequest(request, multipartFiles, parameters);
}
catch (FileUploadBase.SizeLimitExceededException ex) {
throw new MaxUploadSizeExceededException(this.fileUpload.getSizeMax(), ex);
}
catch (FileUploadException ex) {
throw new MultipartException("Could not parse multipart request", ex);
}
}
====================================================================================================

表单标签中设�|�enctype="multipart/form-data"来确保匿名上载文件的正确�~�码�?br /> 如下�Q?br />
    上传企业营业执照囄��Q?lt;/td>


��得加ENCTYPE="multipart/form-data"�?br /> 表单中enctype="multipart/form-data"的意思，是设�|�表单的MIME�~�码。默认情况，�q�个�~�码格式是application/x-www-form-urlencoded�Q�不能用于文件上传；只有使用了multipart/form- data�Q�才能完整的传递文件数据，�q�行下面的操�?
enctype=\"multipart/form-data\"是上传二�q�制数据; form里面的input的��g��2�q�制的方式传�q�去�?br /> form里面的input的��g��2�q�制的方式传�q�去�Q�所以request��得不到��g��?nbsp;也就是说加了�q�段代码,用request��׃��传递不成功,

取表单值加入数据库�Ӟ��用到下面的：
SmartUpload su = new SmartUpload();//新徏一个SmartUpload对象
su.getRequest().getParameterValues();取数�l��?br /> su.getRequest().getParameter( );取单个参数单个�?/p>

xyz 2008-03-14 10:52 发表评论

xyz — Thu, 06 Mar 2008 10:27:00 GMT

by xyz

今天使上面这�D�代码，想从服务端�{两段数据�q�来�Q�一�D는�来显�C�白提示�Q�一�D는�来控制一个div的显�C�和隐藏。所以我惛_��了传一个responseXML
�l�果在调试中出现很多问题�Q�显�C�Z��出来�Q�搞了半天，分析�ȝ��了如下：
1、在服务器必��d��成xml文�g格式�Q�还不能用写两个out.println()语句来写那两�D�|��字，必须写能一�D�XML文�g�Q�用两个的子节点来写那两�D�|��字�?br /> 2、在jsp��面上显�C�时�Q�要�q�样写才能获取到documentElement
var myDocument = new ActiveXObject("Microsoft.XMLDOM")
    myDocument.async="false";
    myDocument.loadXML(originalRequest.responseText);
window.alert(myDocument);
    var myRoot = myDocument.documentElement;
在页面上getElementsByTagName("font")[0].firstChild.data;的时一定要get在服务端有写的元素，不然也会��D��其它正确的显�C�Z��出来�?br />

xyz 2008-03-06 18:27 发表评论

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表单form的enctype="multipart/form-data"使用体会