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 >
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(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 >
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(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" ;
}
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(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);
}
}
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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();
}
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(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 >
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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" ;
}
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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