一、配置SpringMVC
在spring.xml中配置：
<!-- springmvc文件上传需要配置的节点--><bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"><property name="maxUploadSize" value="-1"/><property name="defaultEncoding" value="UTF-8"/><property name="resolveLazily" value="false"/><property name="uploadTempDir" value="/statics/document/tempdir"/><!--<property name="maxInMemorySize" value="104857600"/>--></bean>
其中属性详解：
defaultEncoding="UTF-8" 是请求的编码格式，默认为iso-8859-1
maxUploadSize="-1 是上传文件的大小，单位为字节 -1表示无限制
uploadTempDir="fileUpload/temp" 为上传文件的临时路径
二、单文件与多文件上传
1、单文件上传
jsp：
<body><h2>文件上传实例</h2><form action="fileUpload.html" method="post" enctype="multipart/form-data">选择文件:<input type="file" name="file"><input type="submit" value="提交"></form></body>
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！
controller：
@RequestMapping("fileUpload")public String fileUpload(@RequestParam(value = "file", required = false) MultipartFile file) {// 判断文件是否为空if (!file.isEmpty()) {try {// 文件保存路径String filePath = request.getSession().getServletContext().getRealPath("/") + "upload/"+ file.getOriginalFilename();// 转存文件file.transferTo(new File(filePath));} catch (Exception e) {e.printStackTrace();}}// 重定向return "redirect:/list.html";}
注意RequestParam参数中value的名字要与jsp中的相互匹配，否则会找不到返回空指针
transferTo是存储文件的核心方法，但是这个方法同一个文件只能使用一次，不能使用第二次，否则tomcat服务器会报500的错误
MultipartFile类常用的一些方法：
- String getContentType()//获取文件MIME类型
- InputStream getInputStream()//后去文件流
- String getName() //获取表单中文件组件的名字
- String getOriginalFilename() //获取上传文件的原名
- long getSize() //获取文件的字节大小，单位byte
- boolean isEmpty() //是否为空
- void transferTo(File dest)//保存到一个目标文件中。
三、多文件上传
与上面的相同只不过是form里面多创建几个input
如果需要使用一个标签控件上传多个文件，需要使用js插件uploadify
jsp：
<body><h2>上传多个文件 实例</h2><form action="filesUpload.html" method="post"enctype="multipart/form-data"><p>选择文件:<input type="file" name="files"><p>选择文件:<input type="file" name="files"><p>选择文件:<input type="file" name="files"><p><input type="submit" value="提交"></form></body>
controller：
private boolean saveFile(MultipartFile file) {// 判断文件是否为空if (!file.isEmpty()) {try {// 文件保存路径String filePath = request.getSession().getServletContext().getRealPath("/") + "upload/"+ file.getOriginalFilename();// 转存文件file.transferTo(new File(filePath));return true;} catch (Exception e) {e.printStackTrace();}}return false;}@RequestMapping("filesUpload")public String filesUpload(@RequestParam("files") MultipartFile[] files) {//判断file数组不能为空并且长度大于0if(files!=null&&files.length>0){//循环获取file数组中得文件for(int i = 0;i<files.length;i++){MultipartFile file = files[i];//保存文件saveFile(file);}}// 重定向return "redirect:/list.html";}
四、带参数上传
还是使用form表单进行上传，但是上传文件的时候要带上一部分的参数
例子form上传使用多个input上传多个文件并且携带参数
jsp：
其中使用了ajaxForm插件，并没有展示出来
<form method="post" enctype="multipart/form-data" id="uploadForm"action="${pageContext.request.contextPath}/background/worksInsert">作品名称：<input type="text" name="name" id="name"><br>参赛年份：<input type="text" name="year" id="year"><br>参加竞赛：<select name="competition" id="competition"><option value="请选择">请选择</option></select><br>源文件上传:<input type="file" name="file1" id="file1"><br>展示文件上传:<input type="file" name="file2" id="file2"><br>附件上传:<input type="file" name="file3" id="file3"><br><input type="submit" value="提交"></form>
controller：
主要是参数的书写，通过不同的value取到不同得文件，同时request.getParameter方法取到参数的值
@RequestMapping("/worksInsert")@ResponseBodypublic MessageCarrier worksInsert(@RequestParam(value = "file1", required = false) MultipartFile file1, @RequestParam(value = "file2", required = false) MultipartFile file2, @RequestParam(value = "file3", required = false) MultipartFile file3, HttpServletRequest request) throws IOException {MessageCarrier messageCarrier = new MessageCarrier();if (file1 == null || request.getParameter("name") == null) {return null;}// 获取源文件存储路径String filename = request.getParameter("name");String sworks = savePathL("works") + "/" + filename;String vworks = savePathL("works") + "/" + filename;String fworks = savePathL("works") + "/" + filename;String sRealworks = System.getProperty("studentSystem.root") + sworks.substring(1, sworks.length());String sRealvworks = System.getProperty("studentSystem.root") + vworks.substring(1, vworks.length());String sRealfworks = System.getProperty("studentSystem.root") + fworks.substring(1, fworks.length());DBWorks dbWorks = new DBWorks();CompetitionWorks competitionWorks = new CompetitionWorks();// System.out.println(request.getParameter("name"));competitionWorks.setWorksName(request.getParameter("name"));competitionWorks.setWorksYear(request.getParameter("year"));competitionWorks.setWorksComID(request.getParameter("competition"));competitionWorks.setWorksIsIndex("0");competitionWorks.setWorksNeedUpdate("0");competitionWorks.setWorksSavePath(sworks + "/" + file1.getOriginalFilename());// 如果有展示文件获取展示文件的存储路径if (file2 != null && file2.getSize() != 0) {competitionWorks.setWorksSaveViewPath(vworks + "/" + file2.getOriginalFilename());} else {competitionWorks.setWorksSaveViewPath("NULL");}// 如果有附件的话获取附件的存储路径并保存if (file3 != null && file3.getSize() != 0) {competitionWorks.setWorksSaveFilePath(fworks + "/" + file3.getOriginalFilename());} else {competitionWorks.setWorksSaveFilePath("NULL");}//先将内容设置为NULLcompetitionWorks.setWorksContent("NULL");messageCarrier = dbWorks.worksInsert(competitionWorks);switch (messageCarrier.getMessageContent()) {case "OK": {FilesUpload filesUpload = new FilesUpload();messageCarrier = filesUpload.upload(file1, sRealworks);if (!competitionWorks.getWorksSaveViewPath().equals("NULL")) {messageCarrier = filesUpload.upload(file2, sRealvworks);}if (!competitionWorks.getWorksSaveFilePath().equals("NULL")) {messageCarrier = filesUpload.upload(file3, sRealfworks);}//如果上传成功则解析内容并将其录入数据库if (messageCarrier.getMessageContent().equals("OK")) {String path = competitionWorks.getWorksSavePath();String filePath = System.getProperty("studentSystem.root") + path;String fileName = path.substring(path.lastIndexOf("/") + 1);File file = new File(filePath);//解析文件内容FilesToContent filesToContent = new FilesToContent();String content = filesToContent.resolve(file);// System.out.println(content);competitionWorks.setWorksContent(content);messageCarrier = dbWorks.worksUpdateName(competitionWorks);}}break;default: {return messageCarrier;}}return messageCarrier;}
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时间： 2024-10-22 02:54:58