大小限制配置
Spring boot2.x,一次请求默认单个文件最大为1MB，全部文件最大为10MB，可在配置文件配置大小
spring.servlet.multipart.max-file-size=50MB spring.servlet.multipart.max-request-size=50MB
配置jsp
#jsp 支持 spring.mvc.view.suffix=.jsp spring.mvc.view.prefix=/WEB-INF/ui/ #静态资源 spring.mvc.static-path-pattern=/static/** spring.resources.static-locations=classpath:/static
为了方便访问WEB-INF下的页面，可配置UrlFilenameViewController，参考：https://faceghost.com/article/327181
创建页面
在WEB-INF/ui下创建upload.jsp
<%@ page language="java" contentType="text/html;charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html > <html> <head> <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"> <title> servlet 文件上传</title> </head> <body> <form action="execUpload" method="post" enctype="multipart/form-data"> fileName:<input type="text" name="fileName"/><br/> file:<input type="file" name="file"><br/> <input type="submit" value="上传"> </form> </body> </html>
创建上传类
@RestController
public class UploadController {
/**
* 文件上传
* @param file 页面中 type="file" name="file"
* @param fileName 页面中 type="text" name="fileName"
* @return 文件上传路径
* @throws Exception
*/
@RequestMapping("/execUpload")
public String upload(MultipartFile file , String fileName) throws Exception{
//开始
System.err.println("upload s ...");
System.err.println("fileName:" + fileName);
String originFileName = file.getOriginalFilename();
System.err.println("originFileName:" + originFileName);
/**
* 获取文件类型
*
*/
String fileType = originFileName.substring(originFileName.lastIndexOf("."),originFileName.length());
/**
* 获取项目webapp目录下的upload的路径
*/
String prePath = this.getClass().getResource("/").getPath() + "static" + File.separator + "upload";
System.err.println("prePath:" + prePath);
/**
* 上传保存后新的文件名称
*/
String newFileName = UUID.randomUUID().toString() + fileType;
System.err.println("newFileName:" + newFileName);
InputStream inputStream = file.getInputStream();
File newFile = new File(prePath + File.separator + newFileName);
if(!newFile.getParentFile().exists()){
newFile.getParentFile().mkdirs();
}
OutputStream outputStream = new FileOutputStream(newFile);
byte[] b = new byte[1024];
int len = 0;
while ((len = inputStream.read(b)) > 0){
outputStream.write(b,0,len);
}
inputStream.close();
outputStream.close();
System.err.println("upload e ...");
return newFile.getAbsolutePath();
}
}上传成功，可以通过http://IP:Port/项目名/static/upload/文件名 访问