1.導入必須的兩個包
<!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.4</version>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
在spring-mvc的配置xml文件裏配
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="maxUploadSize" value="20000000"/>
<property name="defaultEncoding" value="utf-8"></property>
</bean>
bean 的id不能錯
2.前端頁面
<meta http-equiv="Content-Type" content="multipart/form-data;charset=utf-8" />
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>測試上傳</title>
</head>
<body>
<form method="post" action="/userPicUpload" enctype="multipart/form-data" >
<fieldset>
<legend>用戶基本信息</legend>
<p>
<label for="userPic">頭像</label>
<input id="userPic" name="userPic" type="file">
</p>
<p>
<input class="submit" type="submit" value="提交">
</p>
</fieldset>
</form>
</body>
</html>
post傳遞，必須加上enctype=“multipart/form-data”
3.後臺接受
@RequestMapping(value = "/userPicUpload",method = RequestMethod.POST)
@ResponseBody
public void userPicUpload(HttpServletRequest request,@RequestParam(value = "userPic",required = false)MultipartFile userPic)throws Exception {
System.out.println("開始");
String path = request.getSession().getServletContext().getRealPath("upload");
String fileName = userPic.getOriginalFilename();
// String fileName = new Date().getTime()+".jpg";
System.out.println(path);
File targetFile = new File(path, fileName);
if(!targetFile.exists()){
targetFile.mkdirs();
}
//保存
try {
userPic.transferTo(targetFile);
} catch (Exception e) {
e.printStackTrace();
}
}
注意MultipartFile 的名字要和前端圖片的name一樣，不然會null