springmvc上传文件大小限制 spring boot文件上传大小限制



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springmvc上传文件大小限制 spring boot文件上传大小限制

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Spring Boot或Spring Cloud快速实现文件上传
很多时候我们都需要在Spring Boot或Spring Cloud中快速集成文件上传功能 , 但是对于新手来说增加文件上传功能需要查阅很多文档 。这里给出了示例可以帮助您快速将文件上传功能集成到系统中来 。
第一步 , 我们需要在application.yml中配置文件上传的大小
spring:servlet:multipart:max-file-size: 1500MBmax-request-size: 1500MB第二步 , 为了能快速处理文件名和URL , 我们要用到FilenameUtils , 在pom.xml的dependencies中引入Apache Commons IO , 注意是否已经有引用 , 避免版本冲突
<dependency><groupId>commons-io</groupId><artifactId>commons-io</artifactId><version>2.11.0</version></dependency>第三步 , 写一个Controller , 处理文件上传的请求
import org.apache.commons.io.FilenameUtils;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.RestController;import org.springframework.web.multipart.MultipartFile;import javax.servlet.http.HttpServletRequest;import java.io.File;import java.util.LinkedHashMap;import java.util.Map;import java.util.UUID;/** * 文件上传控制器 * * @author 杨若瑜 [email protected]@RequestMapping("/platform/")public class UploadFileController {// 相对于项目根路径的上传路径private static final String UPLOAD_FOLDER = "/upload/";// 返回给前端的服务器根路径(分布式、CDN场景很有用)private static final String URL_SERVER = "http://127.0.0.1:8080/";// 允许上传的文件扩展名private static final String[] ALLOW_EXTENSIONS = new String[]{// 图片"jpg", "jpeg", "png", "gif", "bmp",// 压缩包"zip", "rar", "gz", "7z", "cab",// 音视频,"wav", "avi", "mp4", "mp3", "m3u8", "ogg", "wma", "wmv", "rm", "rmvb", "aac", "mov", "asf", "flv",// 文档"doc", "docx", "xls", "xlsx", "ppt", "pptx", "pot", "txt", "csv", "md", "pdf"};/*** 判断文件名是否允许上传* @param fileName 文件名* @return*/public boolean isAllow(String fileName) {String ext = FilenameUtils.getExtension(fileName).toLowerCase();for (String allowExtension : ALLOW_EXTENSIONS) {if (allowExtension.toLowerCase().equals(ext)) {return true;}}return false;}/*** 上传文件* @param request 请求* @param file 文件 , 与前台提交表单的file相一致* @return 返回JSON*/@RequestMapping("upload")public Object upload(HttpServletRequest request, @RequestParam("file") MultipartFile file) {String webAppFolder = request.getServletContext().getRealPath("/");String fileName = file.getOriginalFilename();if (isAllow(fileName)) {String ext = FilenameUtils.getExtension(fileName).toLowerCase();String newFileName = UUID.randomUUID().toString().replace("-", "");// 自动创建上传目录String targetPath = FilenameUtils.normalize(webAppFolder + "/" + UPLOAD_FOLDER);String targetFile = FilenameUtils.normalize(targetPath + "/" + newFileName + "." + ext);new File(targetPath).mkdirs();try {String urlPath = URL_SERVER + "/" + UPLOAD_FOLDER + "/" + newFileName + "." + ext;file.transferTo(new File(targetFile));Map<String, Object> resJson = new LinkedHashMap<>();resJson.put("status", "success");resJson.put("data", FilenameUtils.normalize(urlPath,true).replace("http:/","http://").replace("https:/","https://"));return resJson;} catch (Exception e) {e.printStackTrace();Map<String, Object> resJson = new LinkedHashMap<>();resJson.put("status", "error");resJson.put("message", "文件上传失败:" + e.getMessage());return resJson;}} else {Map<String, Object> resJson = new LinkedHashMap<>();resJson.put("status", "error");resJson.put("message", "该类型文件不允许上传");return resJson;}}}第四步、写一个测试网页upload.html , 启动并测试一下是否好用 。
<!doctype html><html lang="zh"><head><meta charset="UTF-8"><meta name="viewport"content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"><meta http-equiv="X-UA-Compatible" content="ie=edge"><title>上传文件测试</title></head><body><form action="/platform/upload" method="post" enctype="multipart/form-data">请选择文件:<input type="file" name="file"><br><input type="submit" value="http://www.mnbkw.com/jxjc/176311/上传"></form></body></html>选择一张照片 , 上传
此时后台会返回一个JSON , 我们打开data所指向的图片看看是否上传成功:
果然 , 图片已经上传成功
至此 , 如何使用Spring Boot或Spring Cloud实现文件上传功能就写到这里 。最后需要补充的是 , 如果你的使用场景使用ajax或App上传 , 表单提交类型必须为multipart/form-data , 并且以post的方式提交 。
这里放上jQuery的范例:
// userInfoAvatar是一个input , 并且type为filevar file = document.getElementById('userInfoAvatar').files[0];var formData = http://www.mnbkw.com/jxjc/176311/new FormData();formData.append("file",file);$.ajax({type: 'POST',url: '/platform/upload',data: formData,contentType: false,processData: false,dataType: "json",mimeType: "multipart/form-data",success: function(data) {// 成功时回调},error : function(data){// 失败时回调}});放上axios范例:
// userInfoAvatar是一个input , 并且type为filelet file = document.getElementById('userInfoAvatar').files[0];let formData = http://www.mnbkw.com/jxjc/176311/new FormData();formData.append("file",file);axios({ method: 'POST',url: '/platform/upload',data:formData,headers: { 'Content-Type': 'multipart/form-data'}}).then((data)=>{ console.log(data)}).catch((ex)=>{ console.error(ex)})放上Http Client Fluent API范例:
String fileName = 文件名;byte[] bytes = 文件的二进制;MultipartEntityBuilder builder = MultipartEntityBuilder.create().setMode(HttpMultipartMode.BROWSER_COMPATIBLE).setCharset(Charset.forName("utf-8"));builder.addBinaryBody("file", bytes, ContentType.MULTIPART_FORM_DATA, fileName); String responseJson = Request.Post("http://127.0.0.1:8080/platform/upload").connectTimeout(20000).socketTimeout(20000).body(builder.build()).execute().returnContent().asString();System.out.println(responseJson);【springmvc上传文件大小限制 spring boot文件上传大小限制】其他的框架如法炮制即可 。真正放到正式环境之前记得要加强安全防护 , 对用户进行鉴权 。