Spring實現(xiàn)文件上傳功能

更新時間：2017年01月25日 10:14:15 作者：Rollen Holt

本篇文章主要介紹了Spring實現(xiàn)文件上傳功能，小編覺得挺不錯的，現(xiàn)在分享給大家，也給大家做個參考。一起跟隨小編過來看看吧

本篇文章，我們要來做一個Spring的文件上傳功能：

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>

</html>

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，所以編碼風格上采取了隨性的方式，不建議大家模仿。

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。

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