文件上传主要分以下几个步骤:
(1)新建maven java project;
(2)在pom.xml加入相应依赖;
(3)新建一个表单页面(这里使用thymleaf);
(4)编写controller;
(5)测试;
(6)对上传的文件做一些限制;
(7)多文件上传实现
(1)新建maven Java project
新建一个名称为spring-boot-fileupload maven Java项目;
(2)在pom.xml加入相应依赖;
加入相应的maven依赖,具体看以下解释:
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< project xmlns = "http://maven.apache.org/POM/4.0.0" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation = "http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" > < modelVersion >4.0.0</ modelVersion > < groupId >com.example</ groupId > < artifactId >spring-boot-fileupload</ artifactId > < version >0.0.1-SNAPSHOT</ version > <!-- spring boot 父节点依赖, 引入这个之后相关的引入就不需要添加version配置, spring boot会自动选择最合适的版本进行添加。 --> < parent > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-starter-parent</ artifactId > < version >1.4.0.RELEASE</ version > </ parent > < dependencies > <!-- spring boot web支持:mvc,aop... --> < dependency > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-starter-web</ artifactId > </ dependency > <!-- thmleaf模板依赖. --> < dependency > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-starter-thymeleaf</ artifactId > </ dependency > </ dependencies > < build > < plugins > <!-- 编译版本; --> < plugin > < artifactId >maven-compiler-plugin</ artifactId > < configuration > < source >1.7</ source > < target >1.7</ target > </ configuration > </ plugin > </ plugins > </ build > </ project > |
(3)新建一个表单页面(这里使用thymleaf)
在src/main/resouces新建templates,在templates下新建一个file.html:
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<!DOCTYPE html> < html xmlns = "http://www.w3.org/1999/xhtml" xmlns:th = "http://www.thymeleaf.org" xmlns:sec = "http://www.thymeleaf.org/thymeleaf-extras-springsecurity3" > < head > < title >Hello World!</ title > </ head > < body > < form method = "POST" enctype = "multipart/form-data" action = "/upload" > < p > 文件:< input type = "file" name = "file" /> </ p > < p > < input type = "submit" value = "上传" /> </ p > </ form > </ body > </ html > |
(4)编写controller;
编写controller进行测试,这里主要实现两个方法:其一就是提供访问的/file路径;其二就是提供post上传的/upload方法,具体看代码实现:
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@Controller public class FileUploadController { // 访问路径为:http://127.0.0.1:8080/file @RequestMapping ( "/file" ) public String file() { return "/file" ; } /** * 文件上传具体实现方法; * * @param file * @return */ @RequestMapping ( "/upload" ) @ResponseBody public String handleFileUpload( @RequestParam ( "file" ) MultipartFile file) { if (!file.isEmpty()) { try { /* * 这段代码执行完毕之后,图片上传到了工程的跟路径; 大家自己扩散下思维,如果我们想把图片上传到 * d:/files大家是否能实现呢? 等等; * 这里只是简单一个例子,请自行参考,融入到实际中可能需要大家自己做一些思考,比如: 1、文件路径; 2、文件名; * 3、文件格式; 4、文件大小的限制; */ BufferedOutputStream out = new BufferedOutputStream( new FileOutputStream( new File( file.getOriginalFilename()))); out.write(file.getBytes()); out.flush(); out.close(); } catch (FileNotFoundException e) { e.printStackTrace(); return "上传失败," + e.getMessage(); } catch (IOException e) { e.printStackTrace(); return "上传失败," + e.getMessage(); } return "上传成功" ; } else { return "上传失败,因为文件是空的." ; } } // 访问路径为:http://127.0.0.1:8080/file @RequestMapping ( "/mutifile" ) public String mutifile() { return "/mutifile" ; } |
(5)编写Application.java然后测试
Application没什么代码,就是Spring Boot的启动配置,具体如下:
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package com.example.controller; import javax.servlet.MultipartConfigElement; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; //import org.springframework.boot.context.embedded.MultipartConfigFactory; import org.springframework.boot.web.servlet.MultipartConfigFactory; import org.springframework.context.annotation.Bean; @SpringBootApplication public class Application { public static void main(String[] args) { SpringApplication.run(Application. class , args); } } |
然后你就可以访问:http://127.0.0.1:8080/file 进行测试了,文件上传的路径是在工程的跟路径下,请刷新查看,其它的请查看代码中的注释进行自行思考
(6)对上传的文件做一些限制;
对文件做一些限制是有必要的,在Application.java进行编码配置:。
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@Bean public MultipartConfigElement multipartConfigElement() { MultipartConfigFactory factory = new MultipartConfigFactory(); //// 设置文件大小限制 ,超了,页面会抛出异常信息,这时候就需要进行异常信息的处理了; factory.setMaxFileSize( "128KB" ); //KB,MB /// 设置总上传数据总大小 factory.setMaxRequestSize( "256KB" ); //Sets the directory location where files will be stored. //factory.setLocation("路径地址"); return factory.createMultipartConfig(); } |
(7)多文件上传实现
多文件对于前段页面比较简单,具体代码实现:
在src/resouces/templates/mutifile.html
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<!DOCTYPE html> < html xmlns = "http://www.w3.org/1999/xhtml" xmlns:th = "http://www.thymeleaf.org" xmlns:sec = "http://www.thymeleaf.org/thymeleaf-extras-springsecurity3" > < head > < title >Hello World!</ title > </ head > < body > < form method = "POST" enctype = "multipart/form-data" action = "/batch/upload" > < p >文件1:< input type = "file" name = "file" /></ p > < p >文件2:< input type = "file" name = "file" /></ p > < p >文件3:< input type = "file" name = "file" /></ p > < p >< input type = "submit" value = "上传" /></ p > </ form > </ body > </ html > |
FileUploadController中新增两个方法:
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// 访问路径为:http://127.0.0.1:8080/mutifile @RequestMapping ( "/mutifile" ) public String mutifile() { return "/mutifile" ; } /** * 多文件具体上传时间,主要是使用了MultipartHttpServletRequest和MultipartFile * * @param request * @return */ @RequestMapping (value = "/batch/upload" , method = RequestMethod.POST) @ResponseBody public String handleFileUpload(HttpServletRequest request) { List<MultipartFile> files = ((MultipartHttpServletRequest) request) .getFiles( "file" ); MultipartFile file = null ; BufferedOutputStream stream = null ; for ( int i = 0 ; i < files.size(); ++i) { file = files.get(i); if (!file.isEmpty()) { try { byte [] bytes = file.getBytes(); stream = new BufferedOutputStream( new FileOutputStream( new File(file.getOriginalFilename()))); stream.write(bytes); stream.close(); } catch (Exception e) { stream = null ; return "You failed to upload " + i + " => " + e.getMessage(); } } else { return "You failed to upload " + i + " because the file was empty." ; } } return "upload successful" ; } |
访问路径:http://127.0.0.1:8080/mutifile 进行测试。
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服务器之家。
原文链接:http://blog.csdn.net/u014695188/article/details/52398239