【springmvc】springmvc中如何上傳文件
阿新 • • 發佈:2017-06-01
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使用到的組件:可自行根據情況選擇版本
<!--上傳依賴包--> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.2</version> </dependency> <!--commons-upload依賴包begin--> <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.5</version> </dependency> <!--commons-upload依賴包END-->
xx-servlet.xml文件配置
<!-- SpringMVC上傳文件時,需要配置MultipartResolver處理器 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <!--默認編碼為ISO-8859-1--> <property name="defaultEncoding" value="UTF-8"/> <!--上傳大小限制為100MB,maxUploadSize配置的是字節數--> <property name="maxUploadSize" value="104857600"/> <!--Set the maximum allowed size (in bytes) before uploads are refused--> <property name="maxInMemorySize" value="40960"/> <!--uploadTempDir上傳文件的臨時路徑,文件上傳完後,臨時目錄中的臨時文件會被自動清除--> <property name="uploadTempDir" value="fileUpload/temp"/> </bean>
tips:關於uploadTempDir,需要創建WEB-INF/fileUpload/temp這兩個文件夾;因為程序不會自動創建,如果不創建,會直接報錯;至於叫什麽,層級如何,根據自己情況可修改;
maxUploadSize:配置的是字節數;
maxInMemorySize:Set the maximum allowed size (in bytes) before uploads are refused
如果在上傳過程中,亂碼,可以在web.xml中配置如下filter,指定編碼格式為utf-8;
<filter> <filter-name>characterEncodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <!--支持異步--> <async-supported>true</async-supported> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>characterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
前端HTML:
如果想一次選擇多文件上傳,可以設置 multiple; 一次上傳一個文件的話,不設置這個屬性;
另外,enctype="multipart/form-data" 是必須設置的;
<form name="Form2" action="/rest/upload/springUpload" method="post" enctype="multipart/form-data"> <h1>使用spring mvc提供的類的方法上傳文件</h1> <input type="file" name="file" multiple="multiple"> <input type="submit" value="upload"/> </form>
後臺代碼:
/* *采用spring提供的上傳文件的方法 */ @RequestMapping(value = "springUpload", method = RequestMethod.POST) public ModelAndView springUpload(HttpServletRequest request) throws IllegalStateException, IOException { long startTime = System.currentTimeMillis(); //將當前上下文初始化給 CommonsMultipartResolver (多部分解析器) CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver( request.getSession().getServletContext()); //檢查form中是否有enctype="multipart/form-data" if (multipartResolver.isMultipart(request)) { //將request變成多部分request MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request; //獲取multiRequest 中所有的文件名 Iterator fileNames = multiRequest.getFileNames(); // 上傳文件夾是否存在,不存在創建;最終格式為/uploadFile/2017-06-01/{文件名} String realPath = request.getSession().getServletContext().getRealPath("/uploadFile/") + DateTimeUtils.getNow().toString(); File pathFile = new File(realPath); if (!pathFile.exists()) { pathFile.mkdirs(); } while (fileNames.hasNext()) { //一次遍歷所有文件 List<MultipartFile> fileList = multiRequest.getFiles(fileNames.next().toString()); if (fileList != null) { for (MultipartFile file : fileList) { String path = realPath + "/" + file.getOriginalFilename(); System.out.println("上傳路徑:" + path); //上傳 file.transferTo(new File(path)); } } } } long endTime = System.currentTimeMillis(); System.out.println("運行時間:" + String.valueOf(endTime - startTime) + "ms"); return new ModelAndView("fileupload/success"); }
最終效果:
參考:
# 關於CommonsMultipartResolver配置
https://docs.spring.io/spring/docs/1.2.x/javadoc-api/org/springframework/web/multipart/commons/CommonsMultipartResolver.html
http://www.cnblogs.com/fjsnail/p/3491033.html # 有個問題,就是方法三種並沒有解決一次上傳多個資源時的情況;
【springmvc】springmvc中如何上傳文件