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Springboot实现文件上传功能

本文实例为大家分享了Spring boot实现文件上传的具体代码,供大家参考,具体内容如下

成都创新互联公司是创新、创意、研发型一体的综合型网站建设公司,自成立以来公司不断探索创新,始终坚持为客户提供满意周到的服务,在本地打下了良好的口碑,在过去的十载时间我们累计服务了上千家以及全国政企客户,如阳台护栏等企业单位,完善的项目管理流程,严格把控项目进度与质量监控加上过硬的技术实力获得客户的一致表扬。

1. 创建一个Maven的web工程,然后配置pom.xml文件,增加依赖:

 
 org.springframework.boot 
 spring-boot-starter-web 
 1.0.2.RELEASE 
 

2. 在webapp目录下的index.jsp文件中输入一个表单:

 
 
File to upload:
Name:

Press here to upload the file!

这个表单就是我们模拟的上传页面

3. 编写处理这个表单的Controller:

import java.io.BufferedOutputStream; 
import java.io.File; 
import java.io.FileOutputStream; 
 
import org.springframework.stereotype.Controller; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.RequestMethod; 
import org.springframework.web.bind.annotation.RequestParam; 
import org.springframework.web.bind.annotation.ResponseBody; 
import org.springframework.web.multipart.MultipartFile; 
 
@Controller 
public class FileUploadController { 
 
 @RequestMapping(value="/upload", method=RequestMethod.GET) 
 public @ResponseBody String provideUploadInfo() { 
  return "You can upload a file by posting to this same URL."; 
 } 
 
 @RequestMapping(value="/upload", method=RequestMethod.POST) 
 public @ResponseBody String handleFileUpload(@RequestParam("name") String name, 
   @RequestParam("file") MultipartFile file){ 
  if (!file.isEmpty()) { 
   try { 
    byte[] bytes = file.getBytes(); 
    BufferedOutputStream stream = 
      new BufferedOutputStream(new FileOutputStream(new File(name + "-uploaded"))); 
    stream.write(bytes); 
    stream.close(); 
    return "You successfully uploaded " + name + " into " + name + "-uploaded !"; 
   } catch (Exception e) { 
    return "You failed to upload " + name + " => " + e.getMessage(); 
   } 
  } else { 
   return "You failed to upload " + name + " because the file was empty."; 
  } 
 } 
 
} 

4. 然后我们对上传的文件做一些限制,同时编写main方法来启动这个web :

import org.springframework.boot.SpringApplication; 
import org.springframework.boot.autoconfigure.EnableAutoConfiguration; 
import org.springframework.boot.context.embedded.MultiPartConfigFactory; 
import org.springframework.context.annotation.Bean; 
import org.springframework.context.annotation.ComponentScan; 
import org.springframework.context.annotation.Configuration; 
 
import javax.servlet.MultipartConfigElement; 
 
@Configuration 
@ComponentScan 
@EnableAutoConfiguration 
public class Application { 
 
 @Bean 
 public MultipartConfigElement multipartConfigElement() { 
  MultiPartConfigFactory factory = new MultiPartConfigFactory(); 
  factory.setMaxFileSize("128KB"); 
  factory.setMaxRequestSize("128KB"); 
  return factory.createMultipartConfig(); 
 } 
 
 public static void main(String[] args) { 
  SpringApplication.run(Application.class, args); 
 } 
} 

5. 然后访问http://localhost:8080/upload就可以看到页面了。

上面的例子是实现的是单个文件上传的功能,假定我们现在要实现文件批量上传的功能的话,我们只需要简单的修改一下上面的代码就行,考虑到篇幅的问题,下面只是贴出和上面不同的代码,没有贴出的说明和上面一样。:

1.新增batchUpload.jsp文件

 
 
File to upload:
File to upload:
Press here to upload the file!

2. 新增BatchFileUploadController.java文件:

import org.springframework.stereotype.Controller; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.RequestMethod; 
import org.springframework.web.bind.annotation.ResponseBody; 
import org.springframework.web.multipart.MultipartFile; 
import org.springframework.web.multipart.MultipartHttpServletRequest; 
 
import javax.servlet.http.HttpServletRequest; 
import java.io.BufferedOutputStream; 
import java.io.File; 
import java.io.FileOutputStream; 
import java.util.List; 
 
/** 
 * Created by wenchao.ren on 2014/4/26. 
 */ 
 
@Controller 
public class BatchFileUploadController { 
 
 @RequestMapping(value="/batch/upload", method= RequestMethod.POST) 
 public @ResponseBody 
 String handleFileUpload(HttpServletRequest request){ 
  List files = ((MultipartHttpServletRequest)request).getFiles("file"); 
  for (int i =0; i< files.size(); ++i) { 
   MultipartFile file = files.get(i); 
   String name = file.getName(); 
   if (!file.isEmpty()) { 
    try { 
     byte[] bytes = file.getBytes(); 
     BufferedOutputStream stream = 
       new BufferedOutputStream(new FileOutputStream(new File(name + i))); 
     stream.write(bytes); 
     stream.close(); 
    } catch (Exception e) { 
     return "You failed to upload " + name + " => " + e.getMessage(); 
    } 
   } else { 
    return "You failed to upload " + name + " because the file was empty."; 
   } 
  } 
  return "upload successful"; 
 } 
} 

这样一个简单的批量上传文件的功能就ok了,是不是很简单啊。

注意:上面的代码只是为了演示而已,所以编码风格上采取了随性的方式,不建议大家模仿。

参考资料:MultipartResolver实现文件上传功能

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持创新互联。

1. MultipartResolver也可以实现文件上传功能。参考文章:


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