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

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