java 代码jodd 上传图片到文件服务器

迈不过友情╰ 2022-01-27 05:11 367阅读 0赞

今天项目需要上传图片到文件服务器，使用的是jodd,特做记录

1.导入依赖

2.post提交图片

private String uploadExecute(MultipartFile multipartFile){
            try {
                File file = multipartFileToFile(multipartFile);
                HttpRequest request = HttpRequest.post(pictureUrl);
                request.contentType("multipart/form-data");
                request.charset("utf-8");
                Map<String,Object> params=new HashMap<>();
                request.form("file",file);
                HttpResponse response = request.send();
                String respJson = response.bodyText();
                return respJson;
            }catch (Exception e){
                e.printStackTrace();
                logger.error("上传图片异常:{}",e);
            }
    
            return null;
    }

遇到问题：request.form("file",file);  form方法不支持multipartFile ，需要将multipartFile 类型转成File类型

3.multipartFile 类型转成File类型

因为我是springboot 项目，转换的时候遇到了很多坑，记录一下

通过配置multipartResolver强制转换File f = (File) xxx，因为使用

//显示声明CommonsMultipartResolver为mutipartResolver  
    @Bean(name = "multipartResolver")  
       public MultipartResolver multipartResolver()\{  
        CommonsMultipartResolver resolver = new CommonsMultipartResolver();  
        resolver.setDefaultEncoding("UTF-8");  
        resolver.setResolveLazily(true);//resolveLazily属性启用是为了推迟文件解析，以在在UploadAction中捕获文件大小异常  
        resolver.setMaxInMemorySize(40960);  
        resolver.setMaxUploadSize(50\*1024\*1024);//上传文件大小 50M 50\*1024\*1024  
        return resolver;  
    \}

导致接收不到图片信息，因为springboot已经封装了自己的图片解释器，这样会导致mutipartFile 接收不到参数

springboot通过将流将mutipartFile 转换

private File multipartFileToFile( MultipartFile file ) throws Exception {
    
            File toFile = null;
            if(file.equals("")||file.getSize()<=0){
                file = null;
            }else {
                InputStream ins = null;
                ins = file.getInputStream();
                toFile = new File(file.getOriginalFilename());
                inputStreamToFile(ins, toFile);
                ins.close();
            }
            return  toFile;
    }
    
        private void inputStreamToFile(InputStream ins, File file) {
            try {
                OutputStream os = new FileOutputStream(file);
                int bytesRead = 0;
                byte[] buffer = new byte[8192];
                while ((bytesRead = ins.read(buffer, 0, 8192)) != -1) {
                    os.write(buffer, 0, bytesRead);
                }
                os.close();
                ins.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }