【Spring boot 文件上传】 - 码农知识堂

【Spring boot 文件上传】

Spring boot 文件上传

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：

POM.XML

< 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/maven-v4_0_0.xsd " >

< modelVersion > 4.0.0 modelVersion >

< groupId > com.hpit groupId >

< artifactId > springboot03 artifactId >

< packaging > war packaging >

< version > 0.0.1-SNAPSHOT version >

< name > springboot03 Maven Webapp name >

< url > http://maven.apache.org url >

< properties >

< project.build.sourceEncoding > UTF-8 project.build.sourceEncoding >

properties >

< parent >

< groupId > org.springframework.boot groupId >

< artifactId > spring-boot-starter-parent artifactId >

< version > 1.4.0.RELEASE version >

parent >

< dependencies >

< dependency >

< groupId > org.springframework.boot groupId >

< artifactId > spring-boot-starter-web artifactId >

dependency >

< dependency >

< groupId > org.springframework.boot groupId >

< artifactId > spring-boot-starter-test artifactId >

< scope > test scope >

dependency >

< dependency >

< groupId > org.springframework.boot groupId >

< artifactId > spring-boot-starter-thymeleaf artifactId >

dependency >

< dependency >

< groupId > org.springframework.boot groupId >

< artifactId > spring-boot-configuration-processor artifactId >

< optional > true optional >

dependency >

< dependency >

< groupId > javax.servlet groupId >

< artifactId > javax.servlet-api artifactId >

< scope > provided scope >

dependency >

< dependency >

< groupId > log4j groupId >

< artifactId > log4j artifactId >

< version > 1.2.17 version >

dependency >

< dependency >

< groupId > javax.servlet groupId >

< artifactId > jstl artifactId >

dependency >

< dependency >

< groupId > org.springframework.boot groupId >

< artifactId > spring-boot-starter-tomcat artifactId >

< scope > provided scope >

dependency >

< dependency >

< groupId > org.apache.tomcat.embed groupId >

< artifactId > tomcat-embed-jasper artifactId >

< scope > provided scope >

dependency >

dependencies >

< build >

< finalName > ${project.artifactId} finalName >

< directory > target directory >

< plugins >

< plugin >

< artifactId > maven-compiler-plugin artifactId >

< configuration >

< source > 1.8 source >

< target > 1.8 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(参照前面的章节，应该知道，templates 是 spring boot 存放模板文件的路

径)，在 templates 下新建一个 file.html:

DOCTYPE html>

< html >

< head >

< title > spring boot 文件上传 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：

com.hpit.springboot03.web.FileUploadController

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import org.apache.log4j.Logger;

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;

/**

* TODO 文件上传控制器

*

*

*/

@Controller

public class FileUploadController {

private Logger logger = Logger. getLogger (getClass());

@RequestMapping (value = "/upload" , method = RequestMethod. GET )

public String file() {

logger .info( "跳转文件上传控制器" );

return "file" ;

}

/**

* TODO 文件上传控制器

*

* @param file

* @return

* @throws IOException

*/

@ResponseBody

@RequestMapping (value = "/upload" , method = RequestMethod. POST )

public String upload( @RequestParam ( "file" ) MultipartFile file ) throws IOException { // 文件上传

BufferedOutputStream outputStream = new BufferedOutputStream(

new FileOutputStream( new File( file .getOriginalFilename())));

logger .info( "文件名称：

" + file .getOriginalFilename());

outputStream .write( file .getBytes());

outputStream .flush();

outputStream .close();

return "文件上传成功" ;

}

}

（5）编写 App.java 然后测试

App.java 没什么代码，就是 Spring Boot 的启动配置，具体如下：

import javax.servlet.MultipartConfigElement;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.web.servlet.MultipartConfigFactory;

import org.springframework.boot.web.servlet.ServletComponentScan;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication

@ServletComponentScan // 开始servlet扫描

@ComponentScan (basePackages = { "com.hpit" })

public class App {

public static void main(String[] args ) throws Exception {

SpringApplication. run (App. class , args );

}

}

然后你就可以访问： http://127.0.0.1 /upload 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 App.java 进行编码配置：

在 App 主程序入口处添加如下配置：

import javax.servlet.MultipartConfigElement;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.web.servlet.MultipartConfigFactory;

import org.springframework.boot.web.servlet.ServletComponentScan;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication

@ServletComponentScan // 开始servlet扫描

@ComponentScan (basePackages = { "com.hpit" })

public class App {

public static void main(String[] args ) throws Exception {

SpringApplication. run (App. class , args );

}

// 配置文件上传

@Bean

public MultipartConfigElement multipartConfigFactory() {

MultipartConfigFactory configFactory = new MultipartConfigFactory();

configFactory .setMaxFileSize( "128MB" ); // KB MB 设置单个上传文件大小

configFactory .setMaxRequestSize( "1024MB" );

configFactory .setLocation( "/" ); // 设置文件上传路径

return configFactory .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/main/resource 下面创建 multifile.html

DOCTYPE html>

< html >

< head >

< title > spring boot 多文件上传 title >

head >

< body >

< form method = "POST" enctype = "multipart/form-data" action = "/upload" >

< p >

文件1： < input type = "file" name = "file" />

文件2： < input type = "file" name = "file" />

文件3： < input type = "file" name = "file" />

p >

< p >

< input type = "submit" value = "上传" />

p >

form >

body >

html >

添加控制实现：com.hpit.springboot03.web.MultiFileUploadController

package com.hpit.springboot03.web;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.List;

import javax.servlet.http.HttpServletRequest;

import org.apache.log4j.Logger;

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;

@Controller

public class MultiFileUploadController {

private Logger logger = Logger. getLogger (getClass());

@RequestMapping (value = "/multifileupload" , method = RequestMethod. GET )

public String multiFile() {

logger .info( "跳转多文件上传" );

return "multifile" ;

}

/**

* TODO 多文件上传控制器

*

* @param servletRequest

* @return

*/

@RequestMapping (value = "multifileupload" , method = RequestMethod. POST )

public @ResponseBody String upload(HttpServletRequest servletRequest ) {

List files = ((MultipartHttpServletRequest) servletRequest ).getFiles( "file" );

for (MultipartFile multipartFile : files ) {

try {

BufferedOutputStream outputStream = new BufferedOutputStream(

new FileOutputStream( new File( multipartFile .getOriginalFilename())));

outputStream .write( multipartFile .getBytes());

outputStream .flush();

outputStream .close();

} catch (FileNotFoundException e ) {

e .printStackTrace();

return "文件上传失败" ;

} catch (IOException e ) {

e .printStackTrace();

return "文件上传失败" ;

}

}

return "文件上传成功" ;

}

}

启动浏览器输入路径进行测试。

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原文地址：https://blog.csdn.net/m0_72254454/article/details/127786167