Java Spring MVC 上传下载文件配置及controller方法详解-6ren

Java Spring MVC 上传下载文件配置及controller方法详解

转载作者：qq735679552 更新时间：2022-09-29 22:32:09

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下载:

1.在spring-mvc中配置(用于100M以下的文件下载) 。

 
    ? 
   
         <bean  
         class 
         = 
         "org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" 
         >  
        
         <property name= 
         "messageConverters" 
         >  
        
         <list>  
        
         <!--配置下载返回类型--> 
        
         <bean  
         class 
         = 
         "org.springframework.http.converter.ByteArrayHttpMessageConverter" 
         />  
        
         <bean  
         class 
         = 
         "org.springframework.http.converter.StringHttpMessageConverter" 
         >  
        
         <!--配置编码方式--> 
        
         <property name= 
         "supportedMediaTypes" 
         value= 
         "application/json; charset=UTF-8" 
         />  
        
         </bean>  
        
         </list>  
        
         </property>  
        
         </bean>

下载文件代码。

 
    ? 
   
         @RequestMapping 
         ( 
         "/file/{name.rp}" 
         ) 
        
         public 
         ResponseEntity< 
         byte 
         []> fileDownLoad( 
         @PathVariable 
         ( 
         "name.rp" 
         )String name, HttpServletRequest request,HttpServletResponse response) { 
        
         // @PathVariable String name, 
        
         // @RequestParam("name")String name, 
        
         // System.out.println("<name>"+name); 
        
         // System.out.println(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>"); 
        
         ResponseEntity< 
         byte 
         []> re =  
         null 
         ; 
        
         try 
         { 
        
         /** 
        
         * css,js,json,gif,png,bmp,jpg,ico,doc,docx,xls,xlsx,txt,swf,pdf 
        
         * **/ 
        
         //下载防止静态加载干扰 
        
         Feelutile f= 
         new 
         Feelutile(); 
        
         name=f.getfileformat(name); 
        
         String pathString= 
         "C:\\tempDirectory\\" 
         +name;  
        
         File file= 
         new 
         File(pathString); 
        
         HttpHeaders headers= 
         new 
         HttpHeaders(); 
        
         //String filename=URLEncoder.encode(name, "UTF-8");//为了解决中文名称乱码问题  
        
         String filename= 
         new 
         String(name.getBytes( 
         "utf-8" 
         ), 
         "utf-8" 
         ); 
        
         byte 
         [] by=FileUtils.readFileToByteArray(file); 
        
         headers.setContentType(MediaType.APPLICATION_OCTET_STREAM); 
        
         //URLEncoder.encode(filename, "UTF-8") 
        
         headers.setContentDispositionFormData( 
         "attachment" 
         ,filename); 
        
         headers.setContentLength(by.length); 
        
         re= 
         new 
         ResponseEntity< 
         byte 
         []>(by, headers, HttpStatus.CREATED); 
        
         }  
         catch 
         (Exception e) { 
        
         e.printStackTrace(); 
        
         try 
         { 
        
         request.getRequestDispatcher( 
         "/error/404.jsp" 
         ).forward(request, response); 
        
         }  
         catch 
         (ServletException e1) { 
        
         // TODO Auto-generated catch block 
        
         e1.printStackTrace(); 
        
         }  
         catch 
         (IOException e1) { 
        
         // TODO Auto-generated catch block 
        
         e1.printStackTrace(); 
        
         } 
        
         } 
        
         return 
         re; 
        
         }

上传文件

1在spring-mvc中配置。

 
    ? 
   
         <!-- 
         4 
         .文件上传 配置 file upload --> 
        
         <bean id= 
         "multipartResolver" 
        
         class 
         = 
         "org.springframework.web.multipart.commons.CommonsMultipartResolver" 
         > 
        
         <property name= 
         "defaultEncoding" 
         > 
        
         <value>UTF- 
         8 
         </value> 
        
         </property> 
        
         <property name= 
         "maxUploadSize" 
         > 
        
         <value> 
         1048576000 
         </value> 
        
         </property> 
        
         <property name= 
         "maxInMemorySize" 
         > 
        
         <value> 
         40960 
         </value> 
        
         </property> 
        
         </bean>

在controller中代码如下。

 
    ? 
   
         @RequestMapping 
         (value= 
         "/upload" 
         , method = RequestMethod.POST) 
        
         @ResponseBody 
        
         public 
         Json upload(Doc doc,  
         @RequestParam 
         ( 
         "uploadFile" 
         ) CommonsMultipartFile file) { 
        
         Json j =  
         new 
         Json(); 
        
         try 
         { 
        
         String realpath =  
         this 
         .servletContext.getRealPath( 
         "/upload" 
         );  
        
         String uploadFileFileName = file.getOriginalFilename();  
        
         String uploadFileFileNameWithoutSpace = uploadFileFileName.replaceAll( 
         " " 
         ,  
         "" 
         );  
        
         String fileType = uploadFileFileNameWithoutSpace.substring(uploadFileFileNameWithoutSpace.lastIndexOf( 
         "." 
         )); 
        
         File targetFile =  
         new 
         File(realpath+File.separator, uploadFileFileNameWithoutSpace); 
        
         if 
         (targetFile.exists()) { 
        
         targetFile.delete(); 
        
         } 
        
         file.getFileItem().write(targetFile);  
        
         docService.upload(doc,uploadFileFileNameWithoutSpace); 
        
         j.setSuccess( 
         true 
         ); 
        
         j.setMsg( 
         "Upload manual successfully" 
         ); 
        
         } 
         catch 
         (Exception e) { 
        
         logger.error(ExceptionUtil.getExceptionMessage(e)); 
        
         j.setMsg( 
         "Upload manual unsuccessfully" 
         ); 
        
         } 
        
         return 
         j; 
        
         }