这是我的控制器类
@Controller
public class UploadController {
@Autowired
UploadDAO uploaddao;
@RequestMapping("/upload")
public ModelAndView getUploadForm(@ModelAttribute("upload") Upload uploadedFile,BindingResult result) {
return new ModelAndView("insertfile");
}
@RequestMapping("/fileUpload")
public ModelAndView fileUploaded(
@ModelAttribute("uploadedFile") Upload uploadedFile,
BindingResult result) {
InputStream inputStream = null;
OutputStream outputStream = null;
MultipartFile file = uploadedFile.getFile();
String fileName = file.getOriginalFilename();
if (result.hasErrors()) {
return new ModelAndView("uploadForm");
}
try {
inputStream = file.getInputStream();
File newFile = new File("D:/try" + fileName);
if (!newFile.exists()) {
newFile.createNewFile();
}
outputStream = new FileOutputStream(newFile);
int read = 0;
byte[] bytes = new byte[1024];
while ((read = inputStream.read(bytes)) != -1) {
outputStream.write(bytes, 0, read);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return new ModelAndView("showFile", "message", fileName);
}
}
这是我的模型类
@Entity
@Table(name="upload_files")
public class Upload
{
@Id
@Column
@GeneratedValue(strategy=GenerationType.AUTO)
private int File_Id;
@Column
private int User_Id;
@Column
private String Title;
@Column
private String Description;
@Column
private String Category;
@Column
private String Area;
@Column
private String Author;
//@Column
//private String Path;
@Column
private String Grant_Status;
@Column
private Date InsertedDate;
@Column
private Date InsertedTime;
@Transient
private MultipartFile file;
public MultipartFile getFile()
{
System.out.println("file"+file);
return file;
}
public void setFile(MultipartFile file) {
this.file = file;
}
public int getUser_Id() {
return User_Id;
}
public void setUser_Id(int user_Id) {
User_Id = user_Id;
}
public String getTitle() {
return Title;
}
public void setTitle(String title) {
Title = title;
}
public String getDescription() {
return Description;
}
public void setDescription(String description) {
Description = description;
}
public String getCategory() {
return Category;
}
public void setCategory(String category) {
Category = category;
}
public String getArea() {
return Area;
}
public void setArea(String area) {
Area = area;
}
public String getAuthor() {
return Author;
}
public void setAuthor(String author) {
Author = author;
}
/*public String getPath() {
return Path;
}
public void setPath(String path) {
Path = path;
}*/
public String getGrant_Status() {
return Grant_Status;
}
public void setGrant_Status(String grant_Status) {
Grant_Status = grant_Status;
}
public Date getInsertedDate() {
return InsertedDate;
}
public void setInsertedDate(Date insertedDate) {
InsertedDate = insertedDate;
}
public Date getInsertedTime() {
return InsertedTime;
}
public void setInsertedTime(Date insertedTime) {
InsertedTime = insertedTime;
}
}
这是我的dao类
@Repository
public class UploadDAO
{
@Autowired
SessionFactory sessionFactory;
@Transactional
public String uploadFile(Upload s)
{
try
{
Session session=this.sessionFactory.openSession();
Transaction tr=session.beginTransaction();
session.save(s); //insert
tr.commit();
session.close();
System.out.println("dao");
}
catch(Exception e)
{
System.out.println(e.getCause());
}
return "Record Inserted...";
}
}
jsp page
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@taglib uri="http://java.sun.com/jstl/core_rt" prefix="c"%>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="fileUpload" method="post" modelAttribute="upload">
<table>
<tr>
<td>User_Id:</td>
<td><input name="User_Id"/></td>
</tr>
<tr>
<td>Title:</td>
<td><input name="Title"/></td>
</tr>
<tr>
<td>Description:</td>
<td><input name="Description"/></td>
</tr>
<tr>
<td>Category:</td>
<td><input name="Category"/></td>
</tr>
<tr>
<td>Area:</td>
<td><input name="Area"/></td>
</tr>
<tr>
<td>Author:</td>
<td><input name="Author"/></td>
</tr>
<tr>
<td>Upload File: </td>
<td><input type="file" name="file" />
</td>
</tr>
<!-- <tr>
<td></td>
<td><input type="hidden" name="file" /></td>
</tr> -->
<tr>
<td colspan="2">
<input type="submit" value="upload">
<!-- <input type="submit" name="action" value="add"> -->
<!-- <input type="submit" name="action" value="edit"> -->
<!-- <input type="submit" name="action" value="delete"> -->
<!-- <input type="submit" name="action" value="search"> -->
</td>
</tr>
</table>
</form>
</body>
</html>
错误追踪：
Dec 22, 2015 4:45:35 PM org.springframework.web.servlet.PageNotFound noHandlerFound
WARNING: No mapping found for HTTP request with URI [/DataRepository/] in DispatcherServlet with name 'DispatcherServlet'
filenull
filenull
Dec 22, 2015 4:46:04 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [DispatcherServlet] in context with path [/DataRepository] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
java.lang.NullPointerException
at org.controller.UploadController.fileUploaded(UploadController.java:41)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:938)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
它在提交上传按钮后给出了空指针异常我正在使用瞬态为MultiPartFile，因为我不想将文件存储到数据库中我只想存储路径和其他细节。