本篇文章，我們要來做一個Spring的文件上傳功能：
1. 創建一個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; @Controllerpublic 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@EnableAutoConfigurationpublic 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。
上面的例子是實現的是單個文件上傳的功能，假定我們現在要實現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. */ @Controllerpublic 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武林網。
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