springboot简易上传下载

Posted 2020-11-21 晨子语

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1.导入上传下载依赖：

　　　　　<dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.2</version>
        </dependency>

        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.4</version>
        </dependency>
　　　　<!-- 添加thymeleaf --> 
　　　　　<dependency> 
　　　　　　　<groupId>org.springframework.boot</groupId> 
　　　　　　　<artifactId>spring-boot-starter-thymeleaf</artifactId> 
　　　　　</dependency>

2.上传：

1）前端页面：

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script>
        function exproExcel() {
            
        }
    </script>
</head>
<body>
    <h1>Spring Boot</h1>
    <a href="/Expro/excel">导出</a>
    <p th:text="${hello}"></p>
    <p>文件上传</p>
    <form action="/upload/file" method="post" enctype="multipart/form-data">
        上传：<input type="file" name="upfile"/>
        <button type="submit">提交</button>
    </form>

</body>
</html>

2）编写跳到上传页面接口：

@Controller
public class HelloController {

    @RequestMapping("/hello")
    public String helloIndex(HashMap<String, Object> map){

        map.put("hello","Hello SpringBoot!");
        return "/index";
    }
}

3）编写接收上传文件接口：

@Controller
@RequestMapping("/upload")
public class UploadFileController {

    @RequestMapping(value = "/file")
    public @ResponseBody String uploadFile(@RequestParam("upfile") MultipartFile file, HttpServletRequest request){

        String message ="";

        try {

            if(!file.isEmpty()){

                FileOutputStream outputStream = new FileOutputStream("F:\XIAOYAO"+"\"+file.getOriginalFilename());

                outputStream.write(file.getBytes());
                outputStream.flush();
                outputStream.close();

                message="上传成功！";


            }



        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            message="上传失败！";
        } catch (IOException e) {
            e.printStackTrace();
            message="上传失败！";
        }

            return message;
    }
}

3.下载：

1）编写下载接口：

@RestController
@RequestMapping("/Expro")
public class ExprotExcelController {

    @RequestMapping("/excel")
    public void exproExcel(HttpServletRequest request, HttpServletResponse response) throws Exception{

        String path =  ClassLoader.getSystemResource("").toURI().getPath(); //获取类加载地址

        System.out.println(path);

        File file = new File(path+"excelTempalte/模板.xlsx");
        FileInputStream fileInputStream = new FileInputStream(file); //读取文件

        response.setHeader("Content-disposition", "attachment;filename=test.xlsx"); //设置响应头和文件名字
        OutputStream outputStream = response.getOutputStream();

        //创建缓存区
        byte [] buffe = new byte[1024];

        int len =0;

        while ((len =fileInputStream.read(buffe))>0){
            outputStream.write(buffe,0,len);
        }
        

        fileInputStream.close();
        outputStream.flush();
        outputStream.close();
    }
}

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