Springboot实现文件上传
环境:
Spring Boot v1.5.1.RELEASE
jdk1.7
实现:
1、引入依赖,支持跳转
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<!-- 添加thymeleaf --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> |
2、在 src/main/resources 目录下新建 static 目录和 templates 目录。 static存放静态文件,比如 css、js、image… templates 存放静态页面。先在templates 中新建一个 uploadimg.html
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<!DOCTYPE html> <html> <head> <title>uploadimg.html</title> <meta name="keywords" content="keyword1,keyword2,keyword3"></meta> <meta name="description" content="this is my page"></meta> <meta name="content-type" content="text/html; charset=UTF-8"></meta> <!--<link rel="stylesheet" type="text/css" href="./styles.css">--> </head> <body> <form enctype="multipart/form-data" method="post" action="/testuploadimg"> 图片<input type="file" name="file"/> <input type="submit" value="上传"/> </form> </body> </html> |
<meta name="keywords" content="keyword1,keyword2,keyword3"></meta>
<meta name="description" content="this is my page"></meta>
<meta name="content-type" content="text/html; charset=UTF-8"></meta>
<!--<link rel="stylesheet" type="text/css" href="./styles.css">-->
</head>
<body>
<form enctype="multipart/form-data" method="post" action="/testuploadimg">
图片<input type="file" name="file"/>
<input type="submit" value="上传"/>
</form>
</body>
</html>
3、在 controller 中写两个方法,一个方法跳转到上传文件的页面,一个方法处理上传文件
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//跳转到上传文件的页面 @RequestMapping(value="/gouploadimg", method = RequestMethod.GET) public String goUploadImg() { //跳转到 templates 目录下的 uploadimg.html return "uploadimg"; } //处理文件上传 @RequestMapping(value="/testuploadimg", method = RequestMethod.POST) public @ResponseBody String uploadImg(@RequestParam("file") MultipartFile file, HttpServletRequest request) { String contentType = file.getContentType(); String fileName = file.getOriginalFilename(); /*System.out.println("fileName-->" + fileName); System.out.println("getContentType-->" + contentType);*/ String filePath = request.getSession().getServletContext().getRealPath("imgupload/"); try { FileUtil.uploadFile(file.getBytes(), filePath, fileName); } catch (Exception e) { // TODO: handle exception } //返回json return "uploadimg success"; } |
//处理文件上传
@RequestMapping(value="/testuploadimg", method = RequestMethod.POST)
public @ResponseBody String uploadImg(@RequestParam("file") MultipartFile file,
HttpServletRequest request) {
String contentType = file.getContentType();
String fileName = file.getOriginalFilename();
/*System.out.println("fileName-->" + fileName);
System.out.println("getContentType-->" + contentType);*/
String filePath = request.getSession().getServletContext().getRealPath("imgupload/");
try {
FileUtil.uploadFile(file.getBytes(), filePath, fileName);
} catch (Exception e) {
// TODO: handle exception
}
//返回json
return "uploadimg success";
}
4、在上面中,我将文件上传的实现写在工具类 FileUtil 的 uploadFile 方法中
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public static void uploadFile(byte[] file, String filePath, String fileName) throws Exception { File targetFile = new File(filePath); if(!targetFile.exists()){ targetFile.mkdirs(); } FileOutputStream out = new FileOutputStream(filePath+fileName); out.write(file); out.flush(); out.close(); } |
以上代码引入spring boot项目后可以实现文件上传到指定文件夹,亲测有效
注意:如果上传的文件大于 1M 时,上传会报错文件太大的错误,在 application.properties 中设置上传文件的参数即可
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spring.http.multipart.maxFileSize=100Mb spring.http.multipart.maxRequestSize=100Mb |