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07
02
springboot

SpringBoot 原始方式文件上传下载!

发表于 2020-07-02 • 被 153 人看爆

写在前面:

本文只关注快速实现功能,写的比较简化,因此适合有一些 SpringBoot 基础的小伙伴~~~

配置文件和配置类

pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.quan</groupId>
    <artifactId>upload</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>upload</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <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>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

application.yml

spring:
 #thymeleaf
 thymeleaf:
  cache: false   # 默认开启缓存,开发环境建议关闭
  enabled: true    # 启用MVC Thymeleaf视图分辨率
  encoding: UTF-8  # 模板编码
  mode: HTML5      # 应用于模板的模板模式
  prefix: classpath:/templates/  #模板前缀,在此路径下存放模板
  suffix: .html		#模板后缀
  servlet:
    content-type: text/html   # servlet 格式

UploadConfig.java

@Configuration
public class UploadConfig {
    @Bean
    public MultipartConfigElement multipartConfigElement() {
        MultipartConfigFactory factory = new MultipartConfigFactory();
        //允许上传的文件最大值
        factory.setMaxFileSize(DataSize.parse("50MB"));
        /// 设置总上传数据总大小
        factory.setMaxRequestSize(DataSize.parse("50MB"));
        return factory.createMultipartConfig();
    }
}

注:我试过在yml配置文件中修改上传文件大小限制,但是不生效,如果你的yml中关于文件上传大小的配置生效,这个配置类大可不必。

Controller

UploadController.java

@Controller
public class UploadController {
    private static final Logger LOGGER = LoggerFactory.getLogger(UploadController.class);

    // 上传下载指定文件夹
    private static final String FILEPATH = "C:/Users/admin/Desktop/upload/";

    @GetMapping("/")
    public String index() {
        return "index";
    }

    @PostMapping("/upload")
    @ResponseBody
    public String upload(@RequestParam("file") MultipartFile file) {
        if (file.isEmpty()) {
            return "上传失败,请选择文件";
        }

        // 获取上传的文件名称
        String fileName = file.getOriginalFilename();
        // 上传文件保存路径
        File dest = new File(FILEPATH + fileName);
        try {
            file.transferTo(dest);
            LOGGER.info("上传成功");
            return "上传成功";
        } catch (IOException e) {
            LOGGER.error(e.toString(), e);
        }
        return "上传失败!";
    }

    @PostMapping("/multiUpload")
    @ResponseBody
    public String multiUpload(HttpServletRequest request) {
        List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("file");
        String filePath = "C:/Users/admin/Desktop/upload/";

        for (int i = 0; i < files.size(); i++) {
            MultipartFile file = files.get(i);
            if (file.isEmpty()) {
                return "上传第" + (i++) + "个文件失败";
            }
            String fileName = file.getOriginalFilename();

            File dest = new File(filePath + fileName);
            try {
                file.transferTo(dest);
                LOGGER.info("第" + (i + 1) + "个文件上传成功");
            } catch (IOException e) {
                LOGGER.error(e.toString(), e);
                return "上传第" + (i++) + "个文件失败";
            }
        }

        return "上传成功";

    }

    @PostMapping("/downFile")
    @ResponseBody
    public String downFile(String fileName, HttpServletRequest request, HttpServletResponse response) throws Exception {
        //获取输入流对象
        FileInputStream fis = new FileInputStream(new File(FILEPATH, fileName));
        //获取文件后缀
        String extendFileName = fileName.substring(fileName.lastIndexOf("."));
        //动态设置相应类型,根据前台文件类型设置响应类型
        response.setContentType(request.getSession().getServletContext().getMimeType(extendFileName));
        //设置响应头,attachment表示以附件形式下载,inline表示在线打开
        response.setHeader("content-disposition", "attachment;fileName=" + URLEncoder.encode(fileName, "UTF-8"));
        //获取输出流对象
        ServletOutputStream os = response.getOutputStream();
        //下载文件,使用spring框架中的FileCopyUtils工具
        FileCopyUtils.copy(fis, os);

        return "下载成功!";
    }
}

注:UploadController 中也包括对下载的处理。

页面

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h2>单文件上传</h2>
<form method="post" action="/upload" enctype="multipart/form-data">
    <input required type="file" name="file"><br>
    <input required type="submit" value="提交">
</form>
<br>
<br>

<h2>多个文件上传</h2>
<form method="post" action="/multiUpload" enctype="multipart/form-data">
    <input required type="file" name="file"><br>
    <input required type="file" name="file"><br>
    <input required type="file" name="file"><br>
    <input required type="submit" value="提交">
</form>
<br>
<br>

<h2>下载文件</h2>
<form method="post" action="/downFile">
    <!--两种方式都可实现  但是下载的文件必须是 controller里指定文件夹中的-->
    <input required type="file" name="fileName"><br>
    <!--<input type="text" name="fileName"><br>-->
    <input required type="submit" value="下载">
</form>
<br>
<br>
</body>
</html>

测试

测试会发现我们成功实现了文件的上传和下载!

ps:如有疑问可以联系 QQ:1540752331

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