Spring MVC实现文件上传和下载

Spring MVC实现文件上传和-

本文实例为大家分享了Spring MVC实现文件上传和-的具体代码，供大家参考，具体内容如下

文件上传

1、导入主要依赖

commons-fileupload

commons-fileupload

1.3.3

javax.servlet

javax.servlet-api

4.0.1

2、配置bean：multipartResolver（注：此bena的id必须为：multipartResolver ， 否则上传文件会报400的错误！）

3、index.jsp

4、Controller

@RestController

public class FileController {

//@RequestParam("file") 将name=file控件得到的文件封装成 CommonsMultipartFile 对象

//批量上传 CommonsMultipartFile 则为数组即可

@RequestMapping("/upload")

public String fileUpload(@RequestParam("file") CommonsMultipartFile file, HttpServletRequest request) throws IOhttp://Exception {

//获取文件名 : file.getOriginalFilename();

String uploadFileName = file.getOriginalFilename();

//如果文件名为空，直接回到首页！

if ("".equals(uploadFileName)) {

return "redirect:/index.jsp";

}

System.out.println("上传文件名 : " + uploadFileName);

//上传路径保存设置

String path = request.getServletContext().getRealPath("/upload");

//如果路径不存在，创建一个

File realPath = new File(path);

if (!realPath.exists()) {

realPath.mkdir();

}

System.out.println("上传文件保存地址：" + realPath);

InputStream is = file.getInputStream(); //文件输入流

OutputStream os = new FileOutputStream(new File(realPath, uploadFileName)); //文件输出流

//读取写出

int len = 0;

byte[] buffer = new byte[1024];

while ((len = is.read(buffer)) != -1) {

os.write(buffer, 0, len);

os.flush();

}

os.close();

is.close();

return "redirect:/index.jsp";

}

/*

* 采用file.Transto 来保存上传的文件

*/

@RequestMapping("/upload2")

public String fileUpload2(@RequestParam("file") CommonsMultipartFile file, HttpServletRequest request) throws IOException {

//上传路径保存设置

String path = request.getServletContext().getRealPath("/upload");

File realPath = new File(path);

if (!realPath.exists()) {

realPath.mkdir();

}

System.out.println("上传文件保存地址：" + realPath);

//通过CommonsMultipartFile的方法直接写文件（注意这个时候）

file.transferTo(new File(realPath + "/" + file.getOriginalFilename()));

return "redirect:/index.jsp";

}

}

文件-

index.jsp

Controller

@RequestMapping(value = "/download")

public String downloads(HttpServletResponse response, HttpServletRequest request) throws Exception {

//要-的图片地址

String path = request.getShttp://ervletContext().getRealPath("/upload");

String fileName = "基础语法.jpg";

//1、设置response 响应头

response.reset(); //设置页面不缓存,清空buffer

response.setCharacterEncoding("UTF-8"); //字符编码

response.setContentType("multipart/form-data"); //二进制传输数据

//设置响应头

response.setHeader("Content-Disposition", "attachment;fileName=" + URLEncoder.encode(fileName, "UTF-8"));

File file = new File(path, fileName);

//2、 读取文件--输入流

InputStream input = new FileInputStream(file);

//3、 写出文件--输出流

OutputStream out = response.getOutputStream();

byte[] buff = new byte[1024];

int index = 0;

//4、执行 写出操作

while ((index = input.read(buff)) != -1) {

out.write(buff, 0, index);

out.flush();

}

out.close();

input.close();

return null;

}

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