Spring boot實現(xiàn)文件上傳功能

發(fā)布時間：2020-10-21 01:06:38 來源：腳本之家閱讀：114 作者：卡通人物nnn 欄目：編程語言

本文實例為大家分享了Spring boot實現(xiàn)文件上傳的具體代碼，供大家參考，具體內(nèi)容如下

1. 創(chuàng)建一個Maven的web工程，然后配置pom.xml文件，增加依賴：

<dependency> 
 <groupId>org.springframework.boot</groupId> 
 <artifactId>spring-boot-starter-web</artifactId> 
 <version>1.0.2.RELEASE</version> 
</dependency>

2. 在webapp目錄下的index.jsp文件中輸入一個表單：

<html> 
<body> 
<form method="POST" enctype="multipart/form-data" action="/upload"> 
 File to upload: <input type="file" name="file"><br /> 
 Name: <input type="text" name="name"><br /> <br /> 
 <input type="submit" value="Upload"> 
  Press here to upload the file! 
</form> 
</body>

這個表單就是我們模擬的上傳頁面

3. 編寫處理這個表單的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. 然后我們對上傳的文件做一些限制，同時編寫main方法來啟動這個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. 然后訪問http://localhost:8080/upload就可以看到頁面了。

上面的例子是實現(xiàn)的是單個文件上傳的功能，假定我們現(xiàn)在要實現(xiàn)文件批量上傳的功能的話，我們只需要簡單的修改一下上面的代碼就行，考慮到篇幅的問題，下面只是貼出和上面不同的代碼，沒有貼出的說明和上面一樣。：

1.新增batchUpload.jsp文件

<html> 
<body> 
<form method="POST" enctype="multipart/form-data" 
  action="/batch/upload"> 
 File to upload: <input type="file" name="file"><br /> 
 File to upload: <input type="file" name="file"><br /> 
 <input type="submit" value="Upload"> Press here to upload the file! 
</form> 
</body> 
</html>

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<MultipartFile> 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"; 
 } 
}

這樣一個簡單的批量上傳文件的功能就ok了，是不是很簡單啊。

注意：上面的代碼只是為了演示而已，所以編碼風(fēng)格上采取了隨性的方式，不建議大家模仿。

參考資料：MultipartResolver實現(xiàn)文件上傳功能

以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持億速云。

1. MultipartResolver也可以實現(xiàn)文件上傳功能。參考文章：

向AI問一下細節(jié)

Spring boot實現(xiàn)文件上傳功能

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