Spring boot 文件上传（多文件上传）

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1.加入相应的maven依赖

<?xml version="1.0" encoding="UTF-8"?><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>demo</artifactId>    <version>0.0.1-SNAPSHOT</version>    <packaging>jar</packaging>    <name>spring-boot</name>    <description>Demo project for Spring Boot</description>    <!--       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>1.5.3.RELEASE</version>        <relativePath/> <!-- lookup parent from repository -->    </parent>    <properties>        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>        <java.version>1.8</java.version>    </properties>    <dependencies>        <!-- spring boot web支持：mvc,aop... -->        <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>            <!--thymleaf模板-->            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-thymeleaf</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-devtools</artifactId>            <optional>true</optional>        </dependency>    </dependencies>    <build>        <plugins>            <!-- 编译版本; -->            <plugin>                <artifactId>maven-compiler-plugin</artifactId>                <configuration>                    <source>1.8</source>                    <target>1.8</target>                </configuration>            </plugin>            <plugin>                <groupId>org.springframework.boot</groupId>                <artifactId>spring-boot-maven-plugin</artifactId>                <configuration>                    <fork>true</fork>                </configuration>            </plugin>        </plugins>    </build></project>

2.新建一个表单页面(这里使用thymleaf)
在src/main/resouces新建templates(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 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>

3.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：

@Controllerpublic 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.";        }    }}

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根路径下

4.对文件做一些限制是有必要的，在Application.java进行编码配置：

@SpringBootApplicationpublic class Application {    public static void main(String[] args) {        SpringApplication.run(Application.class, args);    }    @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();    }}

5.多文件上传实现
在src/resouces/templates/mutifile.html

<!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>

/** * 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)public@ResponseBodyString 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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