springmvc的单文件和多文件上传和文件下载

一. 配置pom.xml

		<dependency>
			<groupId>commons-fileupload</groupId>
			<artifactId>commons-fileupload</artifactId>
			<version>1.3</version>
		</dependency>

二. SpringMVC 用的是的MultipartFile来进行文件上传所以我们首先要配置springmvc中的MultipartResolver:用于处理表单中的file

	<!-- 配置文件上传，如果没有使用文件上传可以不用配置 -->
	<bean name="multipartResolver"
		class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<!-- 默认编码 -->
		<property name="defaultEncoding" value="utf-8" />
		<!-- 文件大小最大值 -->
		<property name="maxUploadSize" value="10485760000" />
		<!-- 内存中的最大值 -->
		<property name="maxInMemorySize" value="1024" />
	</bean>

三.编写jsp页面（文件上传和文件下载页面）

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
        <form action="springmvc/uploads" method="post" enctype="multipart/form-data">
                文件1:<input type="file" name="files">
                <br>
                文件2:<input type="file" name="files">
                <br>
                文件3:<input type="file" name="files">
                <br>
                <input type="submit" value="多文件上传">
        </form>
        <form action="springmvc/upload" method="post" enctype="multipart/form-data">
                文件:<input type="file" name="file">
                <br>
                <input type="submit" value="单文件上传">
        </form>
    <a href="springmvc/download">下载a.txt文件</a> 
</body>
</html>

注意要在form标签中加上enctype="multipart/form-data"表示该表单是要处理文件的,这是最基本的东西，很多人会忘记然而当上传出错后则去找程序的错误，却忘了这一点。

四.编写控制类

1.多文件上传控制类

//文件上传
	private void saveFile(MultipartFile file) {
		if (!file.isEmpty()) {
			String rootPath = "C:\\Programme Software\\eclipse\\eclipse\\eclipse-workspace\\upload\\";
			String fileName = file.getOriginalFilename();
			File writeFile = new File(rootPath, fileName);
			try {
				file.transferTo(writeFile);
			} catch (IllegalStateException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
//文件上传
	@RequestMapping(value = "/uploads")
	public String Upload(MultipartFile[] files) throws Exception {
		for (MultipartFile file : files) {
			saveFile(file);
		}
		return "success";
	}

通过MultipartFile的transferTo(File dest)这个方法来转存文件到指定的路径。

2.单文件上传控制类

	//单文件上传
	@RequestMapping(value = "/upload")
	public String Upload(MultipartFile file) throws Exception {
		if (!file.isEmpty()) {
			String rootPath = "C:\\Programme Software\\eclipse\\eclipse\\eclipse-workspace\\upload\\";
			String fileName = file.getOriginalFilename();
			File writeFile = new File(rootPath, fileName);
			try {
				file.transferTo(writeFile);
			} catch (IllegalStateException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return "success";
	}

3.文件下载控制类

	//文件下载
	@RequestMapping("/download")
	public ResponseEntity<byte[]> DownloadFile(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		// 接受的是UTF-8
		req.setCharacterEncoding("utf-8");
		// 获取项目根目录
		String path = "C:\\Programme Software\\eclipse\\eclipse\\eclipse-workspace\\upload\\a.txt";
		// 获取文件名
		String filename = "a.txt";
		File file = null;
		HttpHeaders headers = null;
		try {
			System.out.println(filename);// myfiles
			file = new File(path);
			// 请求头
			headers = new HttpHeaders();
			String fileName1 = new String(filename.getBytes("UTF-8"), "iso-8859-1");// 解决文件名乱码
			// 通知浏览器以attachment（下载方式）打开图片
			headers.setContentDispositionFormData("attachment", fileName1);
			// application/octet-stream二进制流数据（最常见的文件下载）。
			headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
		return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file), headers, HttpStatus.OK);
	}

springmvc的单文件和多文件上传和文件下载

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