SpringBoot上传下载文件

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1 配置文件

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########## 文件上传配置 #########
  spring:
	  servlet:
	    multipart:
	      enabled: true # 开启多文件上传
	      max-file-size: 5MB 
	      max-request-size: 5MB

2 Controller编写

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package com.pibigstar.web;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import com.pibigstar.common.Constant;

/**
 * 文件上传Controller
 * @author pibigstar
 *
 */
@Controller()
@RequestMapping("/file")
public class FileController {

	private final String upload_path = Constant.DEFAULT_FILE_UPLOAD_PATH;

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

	/**
	 * 上传
	 * @param file
	 * @param redirectAttributes
	 * @return
	 */
	@PostMapping("upload")
	public String singleFileUpload(@RequestParam("file") MultipartFile file,RedirectAttributes redirectAttributes) {
		if (file.isEmpty()) {
			redirectAttributes.addFlashAttribute("message", "请选择文件进行上传");
			return "redirect:/file/uploadStatus";
		}

		try {
			byte[] bytes = file.getBytes();
			Path path = Paths.get(upload_path+file.getOriginalFilename());
			Files.write(path, bytes);

			redirectAttributes.addFlashAttribute("message","成功上传文件： '" + file.getOriginalFilename() + "'");

		} catch (IOException e) {
			e.printStackTrace();
		}

		return "redirect:/file/uploadStatus";
	}

	/**
	 * 下载
	 * @param res
	 * @throws IOException
	 */
	@GetMapping("download")  
	public void download(HttpServletResponse res) throws IOException {

		String fileName = "Main.jpg";
		res.setHeader("content-type", "application/octet-stream");
		res.setContentType("application/octet-stream");
		res.setHeader("Content-Disposition", "attachment;filename=" + fileName);
		byte[] buff = new byte[1024];
		BufferedInputStream bis = null;
		OutputStream os = null;
		try {
			os = res.getOutputStream();
			bis = new BufferedInputStream(new FileInputStream(new File("E://temp/"+ fileName)));
			int i = bis.read(buff);
			while (i != -1) {
				os.write(buff, 0, buff.length);
				os.flush();
				i = bis.read(buff);
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (bis != null) {
				try {
					bis.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		System.out.println("success");
	}

	@GetMapping("uploadStatus")
	public String uploadStatus() {
		return "uploadStatus";
	}
}

3 前台

upload.html

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<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<body>

<h1>文件上传示例</h1>

<form method="POST" action="/file/upload" enctype="multipart/form-data">
    <input type="file" name="file" /><br/><br/>
    <input type="submit" value="Submit" />
</form>

</body>
</html>

uploadStatus.html

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<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<body>

<h1>上传成功</h1>

<div th:if="${message}">
    <h2 th:text="${message}"/>
</div>

<div th:if="${path}">
    <h2 th:text="${path}"/>
</div>

</body>
</html>
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