springbootのアップロードとダウンロード

ここで私は達成するために2つの方法を使用します

最初

pom.xml

        <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>

application.properties

spring.thymeleaf.cache=true

html
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>
            <meta charset="UTF-8" /> 
            <title>Insert title here</title> 
      </head> 
 <body>
       <h1 th:inlines="text">文件上传</h1>
       <form action="fileUpload" method="post" enctype="multipart/form-data">
         <p>选择文件: <input type="file" name="fileName"/></p>
          <p><input type="submit" value="提交"/></p> 
      </form> 
</body> 
</html>

multifile.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> <meta charset="UTF-8" /> 
     <title>Insert title here</title> 
      </head>
   <body> 
         <h1 th:inlines="text">文件上传</h1> 
        <form action="multifileUpload" method="post" enctype="multipart/form-data" >
               <p>选择文件1: <input type="file" name="fileName"/></p> 
               <p>选择文件2: <input type="file" name="fileName"/></p> 
               <p>选择文件3: <input type="file" name="fileName"/></p> 
               <p><input type="submit" value="提交"/></p> 
        </form>
     </body> 
</html>

コントローラ

package com.spring.boot.upload.Controller;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
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;
import org.springframework.web.multipart.MultipartHttpServletRequest;

@Controller
public class UploadController {
    
    

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

	/*
	 * 实现文件上传
	 */
	@RequestMapping("fileUpload")
	@ResponseBody
	public String fileUpload(@RequestParam("fileName") MultipartFile file) {
    
    
		if (file.isEmpty()) {
    
    
			return "false";
		}
		String fileName = file.getOriginalFilename();
		int size = (int) file.getSize();
		System.out.println(fileName + "-->" + size);
		String path = "C:\\upload";
		File dest = new File(path + "/" + fileName);
		if (!dest.getParentFile().exists()) {
    
    // 判断文件父目录是否存在
			dest.getParentFile().mkdir();
		}
		try {
    
    
			file.transferTo(dest); // 保存文件
			return "true";
		} catch (IllegalStateException e) {
    
    
			// TODO Auto-generated catch block
			e.printStackTrace();
			return "false";
		} catch (IOException e) {
    
    
			// TODO Auto-generated catch block
			e.printStackTrace();
			return "false";
		}
	}

	/*
	 * 获取multifile.html页面
	 */
	@RequestMapping("multifile")
	public String multifile() {
    
    
		return "/multifile";
	}

	/*
	 * 实现多文件上传
	 */
	@RequestMapping(value = "multifileUpload", method = RequestMethod.POST)
	/**
	 * public @ResponseBody String
	 * multifileUpload(@RequestParam("fileName")List<MultipartFile> files)
	 */
	public @ResponseBody String multifileUpload(HttpServletRequest request) {
    
    
		List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("fileName");
		if (files.isEmpty()) {
    
    
			return "false";
		}
		String path = "C:\\upload";
		for (MultipartFile file : files) {
    
    
			String fileName = file.getOriginalFilename();
			int size = (int) file.getSize();
			System.out.println(fileName + "-->" + size);
			if (file.isEmpty()) {
    
    
				return "false";
			} else {
    
    
				File dest = new File(path + "/" + fileName);
				if (!dest.getParentFile().exists()) {
    
    // 判断文件父目录是否存在
					dest.getParentFile().mkdir();
				}
				try {
    
    
					file.transferTo(dest);
				} catch (Exception e) {
    
    
					e.printStackTrace();
					return "false";
				}
			}
		}
		return "true";
	}

	@RequestMapping("/download")
	public String downLoad(HttpServletResponse response) throws UnsupportedEncodingException {
    
    
		String filename = "项目报告.pptx";
		String filePath = "E:\\COT";
		File file = new File(filePath + "/" + filename);
		if (file.exists()) {
    
    
			// 判断文件父目录是否存在
			response.setContentType("application/vnd.ms-excel;charset=UTF-8");
			response.setCharacterEncoding("UTF-8");
			// response.setContentType("application/force-download");
			response.setHeader("Content-Disposition",
					"attachment;fileName=" + java.net.URLEncoder.encode(filename, "UTF-8"));
			byte[] buffer = new byte[1024];
			FileInputStream fis = null;
			// 文件输入流
			BufferedInputStream bis = null;
			OutputStream os = null;
			// 输出流
			try {
    
    
				os = response.getOutputStream();
				fis = new FileInputStream(file);
				bis = new BufferedInputStream(fis);
				int i = bis.read(buffer);
				while (i != -1) {
    
    
					os.write(buffer);
					i = bis.read(buffer);
				}
			} catch (Exception e) {
    
    
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			System.out.println("----------file download---" + filename);
			try {
    
    
				bis.close();
				fis.close();
			} catch (IOException e) {
    
    
				e.printStackTrace();
			}
		}
		return null;
	}

}

2番目の
pom.xmlは最初のものと同じです。ここでは記述しません。

application.properties

#默认支持文件上传.
spring.http.multipart.enabled=true

#支持文件写入磁盘.
spring.http.multipart.file-size-threshold=0

# 上传文件的临时目录
#spring.http.multipart.location=

# 最大支持文件大小
spring.http.multipart.max-file-size=10Mb

# 最大支持请求大小
spring.http.multipart.max-request-size=20Mb

エントリーファイル

package com.springbootupload2;

import org.apache.coyote.http11.AbstractHttp11Protocol;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.embedded.tomcat.TomcatConnectorCustomizer;
import org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory;
import org.springframework.context.annotation.Bean;

@SpringBootApplication
public class SpringBootUpload2Application {
    
    

    public static void main(String[] args) {
    
    
        SpringApplication.run(SpringBootUpload2Application.class, args);
    }

    @Bean
    public TomcatServletWebServerFactory tomcatEmbedded() {
    
    
        TomcatServletWebServerFactory tomcat = new TomcatServletWebServerFactory();
        tomcat.addConnectorCustomizers((TomcatConnectorCustomizer) connector -> {
    
    
            if ((connector.getProtocolHandler() instanceof AbstractHttp11Protocol<?>)) {
    
    
                // -1 means unlimited
                ((AbstractHttp11Protocol<?>) connector.getProtocolHandler()).setMaxSwallowSize(-1);
            }
        });
        return tomcat;
    }
}

ツール

package com.springbootupload2.ulit;

import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.multipart.MultipartException;

@ControllerAdvice
public class GlobalExceptionHandler {
    
    
	@ExceptionHandler(MultipartException.class)
	public String handleError1(MultipartException e, Model model) {
    
    
		model.addAttribute("message", e.getCause().getMessage());
		return "uploadStatus";
	}

}

コントローラ

package com.springbootupload2.Controller;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

@Controller
public class UploadController {
    
    

	private static final String UPLOADED_FOLDER = "C:\\Users\\赵\\IdeaProjects\\spring-boot-upload2\\src\\main\\resources\\static\\";

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

	@PostMapping("/upload")
	public String singleFileUpload(@RequestParam("file") MultipartFile file, Model model) {
    
    
		if (file.isEmpty()) {
    
    
			model.addAttribute("message", "请选择要上传的文件");
			return "/";
		}

		try {
    
    
			// Get the file and save it somewhere
			byte[] bytes = file.getBytes();
			Path path = Paths.get(UPLOADED_FOLDER + file.getOriginalFilename());
			Files.write(path, bytes);

			model.addAttribute("message", "上传成功 '" + file.getOriginalFilename() + "'");

		} catch (IOException e) {
    
    
			e.printStackTrace();
			model.addAttribute("message", "上传异常，请联系管理员！");
		}

		return "uploadStatus";
	}

}

html
file.html

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8" /> 
    <title>Insert title here</title> 
</head>
<body>
<h1>Spring Boot 文件上传</h1>
<form method="POST" action="/upload" enctype="multipart/form-data">
    <input type="file" name="file" /><br/><br/>
    <input type="submit" value="上传" />
</form>
</body>
</html>

uploadStatus.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8" /> 
    <title>Insert title here</title> 
</head>
<body>
<h1>Spring Boot - 上传状态</h1>
<div th:if="${message}">
    <h2 th:text="${message}"/>
</div>
</body>
</html>

springbootのアップロードとダウンロード

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