1.普通方式（没有配置multipartResolver）
/**
* @Description 上传文件
* @author zhangyd
* @date 2015年12月1日 下午3:02:23
* @return
* @throws Exception
*/
@RequestMapping("/uploadFile")
@ResponseBody
public Object uploadFile(HttpServletRequest request) throws Exception {
String path = LoadSystemProperties.UPLOAD_FILES_PATH;
File file = new File(path);
if (!file.exists()) {
file.mkdirs();
}
//获取图片url地址
String fileName = "";// 文件名称
/**上传文件处理内容**/
DiskFileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload sfu = new ServletFileUpload(factory);
sfu.setHeaderEncoding("UTF-8"); // 处理中文问题
sfu.setSizeMax(1024 * 1024); // 限制文件大小
try {
List<FileItem> fileItems = sfu.parseRequest(request); // 解码请求
for (FileItem fi : fileItems) {
String name = fi.getName();
if (name == null) {
continue;
}
fileName = UUID.randomUUID() + name.substring(name.lastIndexOf("."), name.length());
fi.write(new File(path, fileName));
}
} catch (Exception e) {
e.printStackTrace();
}
//获取图片url地址
return path + "\\" + fileName;
}
注：以上使用必须是在没有配置multipartResolver的前提下，配置multipartResolver后将会获取不到
这个问题只需要了解下SpringMVC中CommonsMultipartResolver的处理源码就会明白
/**
* Parse the given servlet request, resolving its multipart elements.
* @param request the request to parse
* @return the parsing result
* @throws MultipartException if multipart resolution failed.
*/
protected MultipartParsingResult parseRequest(HttpServletRequest request) throws MultipartException {
String encoding = determineEncoding(request);
FileUpload fileUpload = prepareFileUpload(encoding);
try {
List<FileItem> fileItems = ((ServletFileUpload) fileUpload).parseRequest(request);
return parseFileItems(fileItems, encoding);
}
catch (FileUploadBase.SizeLimitExceededException ex) {
throw new MaxUploadSizeExceededException(fileUpload.getSizeMax(), ex);
}
catch (FileUploadException ex) {
throw new MultipartException("Could not parse multipart servlet request", ex);
}
}
因为，配置完CommonsMultipartResolver之后，实际上SpringMVC已经对当前的HttpServletRequest处理过了；因此，当再次通过sfu.parseRequest(request);// 解码请求获取请求中的文件时，就会获取不到了。
2.通过SpringMVC的multipartResolver处理器获取
注：必须配置以下内容
<!-- SpringMVC上传文件时，需要配置MultipartResolver处理器 -->
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="defaultEncoding" value="UTF-8" />
<!-- 指定所上传文件的总大小不能超过100MB。注意maxUploadSize属性的限制不
是针对单个文件，而是所有文件的容量之和 -->
<!-- <property name="maxUploadSize" ><value>104857600</value></property> -->
<!-- <property name="uploadTempDir" value="E:\temp"></property> -->
<!-- <property name="resolveLazily"></property> -->
<!-- <property name="servletContext"></property> -->
<!-- <property name="maxInMemorySize"></property> -->
</bean>
1).
public void upload(HttpServletRequest request) {
// 转型为MultipartHttpRequest
try {
MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
List<MultipartFile> fileList = multipartRequest.getFiles("file");
for (MultipartFile mf : fileList) {
if (!mf.isEmpty()) {
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
2).
/**
* @param files
* @return
* @throws Exception
* @Description 上传文件
* @author zhangyd
* @date 2015年12月1日 下午3:02:23
*/
@RequestMapping("/uploadFile2")
@ResponseBody
public Object uploadFile(@RequestParam(value = "file") MultipartFile[] files) throws Exception {
String path = LoadSystemProperties.UPLOAD_FILES_PATH;
File file = new File(path);
if (!file.exists()) {
file.mkdirs();
}
for (MultipartFile fi : files) {
path = FileUtil.getUploadFilePath(fi);
}
//获取图片url地址z
return path;
}