我的问题与多文件上传有关。我使用Viral Patel example作为参考，并且能够将任何类型的文件上传到db，它正在非常好地存储和检索。和文件作为blob类型存储在mysql db中。现在我的要求是上传不是一个文件，而是上传多个文件。我使用javascript添加了一个按钮来添加更多文件。它工作正常。但如果我添加2或3个文件，则没有动态创建列。请建议我。下面是我的代码
这是我的POJO课程：
**POJO CLASS**
@Entity
@Table(name="AGREEMENT")
public class Agreement implements Serializable{
private static final long serialVersionUID = 2641L;
@Id
@Column(name="AGREEMENT_ID")
@GeneratedValue(strategy=GenerationType.AUTO)
private int agreementId;
@ManyToOne
@JoinColumn(name="CUSTOMER_ID")
private Customer customer;
@Column(name="CONTENT")
@Lob
private Blob content;
@Column(name="filename")
private String filename;
@Column(name="content_type")
private String contentType;
//getters and setters
}
这是控制器：
**Controller**
@RequestMapping(value="/agreement.htm", method=RequestMethod.GET)
public ModelAndView agreementForm(ModelMap model,HttpServletRequest request,
Agreement agreement) {
int customerId=Integer.parseInt(request.getParameter("id"));
logger.info("Agreememt to be added" +customerId);
Customer customer = new Customer(customerId);
agreement.setCustomer(customer);
model.addAttribute("agreement", agreement);
ModelAndView mav = new ModelAndView("addAgreement");
return mav;
}
@RequestMapping(value = "/addAgreement.htm", method = RequestMethod.POST)
public String queryAddConfirm(@ModelAttribute Agreement
agreement,@RequestParam("file") MultipartFile file, BindingResult result, ModelMap
model, HttpServletRequest servlet, HttpSession session) throws Exception
{
Long fileSize = file.getSize();
Blob blob = Hibernate.getLobCreator(sessionFactory.openSession()).
createBlob(file.getInputStream(), fileSize);
logger.info("Added Agreements");
//query.setContent(content);
agreement.setContent(blob);
agreement.setContentType(file.getContentType());
agreement.setFilename(file.getOriginalFilename().toString());
model.addAttribute("agreement", agreement);
model.addAttribute("agreement", agreement.getCustomer());
System.out.println("customerID"+agreement.getCustomer());
customerService.addAgreements(agreement);
return "redirect:/customerAdmin/adminListAgreement.htm";
}
@RequestMapping("/download/{agreementId}")
public String download(@PathVariable("agreementId")
Integer agreementId, HttpServletResponse response) {
Agreement agreement = customerService.fileDownload(agreementId);
try {
response.setHeader("Content-Disposition", "inline;filename=\""
+agreement.getFilename().toString()+ "\"");
OutputStream out = response.getOutputStream();
response.setContentType(agreement.getContentType().toString());
IOUtils.copy(agreement.getContent().getBinaryStream(), out);
out.flush();
out.close();
} catch (IOException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
这是Dao实施层：
**Customer DaoIMPL**
public void addAgreements(Agreement agreement) {
getCurrentSession().save(agreement);
}
这是添加文件jsp。在这里我创建了一个名为“添加文件”的按钮。当我单击添加按钮时，新的浏览按钮正在创建，并且能够选择文件。但是在db中，动态提交后没有创建行。请帮助我如何添加动态列以及如何下载（检索）它。
**addAgreement JSP**
<div id=add-container align="center" style="height:400px;width:400px"><br>
<p><font color="white" size="6px" face="Comic sans MS" >Add
Agreement</font></p><hr>
<div class="containerdiv" align="center">
<form:label path="customer" type="text" align="left" value=""
maxlength="50">Customer ID :<span class="error"></span></form:label>
<form:input style="width:300px" path="customer" readonly="true"/>
<font color="red"><form:errors path="customer" /></font></div><br>
<p>Select files to upload. Press Add button to add more file inputs.</p>
<input id="addFile" type="button" value="Add File" />
<div class="containerdiv" align="center">
<table id="fileTable" align="center">
<tr>
<td><input name="file" id= "file" type="file" /></td>
</tr>
</table></div>
<br>
<div class="row" Align="center" margin-top: "15px;">
<input class="submit" style="width:150px" type="submit"
value="upload" class="large-centered radius button columns"/>
<input class="cancel" style="width:150px" type="button"
value="Cancel" class="large-centered columns button disabled radius closeButton"
onclick=" goBack()"/>
</div>
</div>
控制器显示添加的文件列表
**listAgreement GET(controller)**
@RequestMapping(value="/adminListAgreement.htm", method=RequestMethod.GET)
public String AgreementList(ModelMap model) {
logger.info("Admin List Agreement GET");
List<Agreement> agreement = customerService.findAllAgreements();
model.addAttribute("agreement", agreement);
return "adminListAgreement";
}
这是adeed jsp文件列表
**listAgreement JSP**
<tr>
<td class="heading">Agreement Id</td>
<td class="heading">Content</td>
<td class="heading">File Name</td>
<td class="heading">CustomerID</td>
</tr>
</thead>
<tbody>
<c:forEach items="${agreement}" var="agreement" >
<tr>
<td>${agreement.agreementId}</td>
<td>
<a href="${pageContext.request.contextPath}/customerAdmin
/download/${agreement.agreementId}.htm">
<img src="${pageContext.request.contextPath}/resources/images
/download1.jpg"
border="0"
title="Download this document"/></a>
</td>
<td> ${agreement.filename}</td>
<td>${agreement.customer}</td>
<%-- <td>${query.image}</td> --%>
</tr>
</c:forEach>
</tbody>
<script>
$(document).ready(function() {
//add more file components if Add is clicked
$('#addFile').click(function() {
var fileIndex = $('#fileTable tr').children().length - 1;
$('#fileTable').append(
'<tr><td>'+
' <input type="file" name="files['+ fileIndex +']" />'+
'</td></tr>'
);
});
});
</script>
答案 0 :(得分：0)
我通过将10个浏览按钮添加到10个文件而不是使用自动添加按钮来添加不同的下载路径来解决它。我刚刚添加了十列和十个浏览按钮，并保留了不同的下载路径来下载它。:)