bootstrap fileinput + springMVC 简单示例

在开发的时候需要实现一个class文件的上传存储功能，所以用到了bootstrap fileinput 插件，后台是用的springMVC。

提前准备

在开始贴代码前把一些必要的jar,css,js等文件准备好。

bootstrap fileinput

需要加载jQuery、bootstrap、fileinput

<script src="http://cdn.bootcss.com/jquery/1.11.1/jquery.min.js"></script> <!-- 加载jQuery --><script src="http://cdn.bootcss.com/bootstrap/3.2.0/js/bootstrap.min.js"></script> <!-- 加载bootstrap的js --><script src="<%=webContext %>/resources/bootstrap/js/fileinput.js"></script> <!-- 加载fileinput的js --><link rel="stylesheet"href="http://cdn.bootcss.com/bootstrap/3.2.0/css/bootstrap.min.css" /> <!-- 加载bootstrap的css样式 --><link rel="stylesheet"href="<%=webContext %>/resources/bootstrap/css/fileinput.css" /> <!-- 加载fileinput的css样式 -->

springMVC

需要配置文件解析器,下面是配置在spring-bean.xml中。

<bean id="multipartResolver"  class="org.springframework.web.multipart.commons.CommonsMultipartResolver">          <property name="maxUploadSize" value="-1" />          <property name="defaultEncoding" value="UTF-8" />          <property name="maxInMemorySize" value="40960"></property>          <property name="uploadTempDir" value="fileUpload/temp"></property>    </bean>

jar包

在配置springMVC的文件解析器时可能会抛出ClassNotFound的异常。原因很可能是缺少Apache的commons-io和commons-fileupload两个jar包，下面是maven添加。

<dependency><groupId>commons-io</groupId><artifactId>commons-io</artifactId><version>1.3.2</version></dependency><dependency><groupId>commons-fileupload</groupId><artifactId>commons-fileupload</artifactId><version>1.2.1</version></dependency>

代码片段

jsp页面代码

jsp页面部分

<button class="btn btn-primary" data-toggle="modal" data-target="#myModal">上传</button><!-- 模态框（Modal） --><div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true"><div class="modal-dialog modal-lg"><div class="modal-content"><div class="modal-header"><button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button><h2 class="modal-title" id="myModalLabel">上传class文件</h2></div><div class="modal-body"><form enctype="multipart/form-data" id="uploadForm"><input id="fileUpload" name="classFile" type="file" multiple class="file-loading"></form></div><div class="modal-footer"><h6>class文件的包名必须是customfuction。</h6><h6>class名作为表达式名,包含一个公开方法。</h6><h6>方法名为class名+Template,无继承，无实现接口。</h6></div></div><!-- /.modal-content --></div><!-- /.modal --></div>

js代码

$("#myModal").on("hidden.bs.modal",function(){location.reload();}); //关闭模态框时刷新页面$("#fileUpload").fileinput({    uploadUrl: "<%=webContext %>/craw/customFunctionUpload.do", // server upload action    allowedFileExtensions: ['class'],    uploadAsync: true,    maxFileCount: 5,    uploadExtraData: {state:"0"}});

后台控制代码

@RequestMapping("craw/customFunctionUpload.do")public void fileUpload(@RequestParam(value = "classFile") MultipartFile file, HttpServletRequest request,HttpServletResponse response) throws IOException, JBOException {if (file != null) {//注意：返回格式必须是json(可查看官方文档)//=========================具体功能可忽略===========================String globalDir = request.getSession().getServletContext().getRealPath("/");String fileName = file.getOriginalFilename();String state = request.getParameter("state");BizObjectManager bm = JBOFactory.getBizObjectManager("jbo.service.custom_function");String version = "1";int count = bm.createQuery("select count(*) from O where funcName=:funcName").setParameter("funcName", fileName.substring(0, fileName.length() - 6)).getSingleResult(false).getAttribute("count(*)").getInt();if("0".equals(state)){if(count >= 1){response.getWriter().print("{\"error\":\"已存在同名class！\"}");return;}}else{if(!fileName.substring(0, fileName.length() - 6).equals(state)){response.getWriter().print("{\"error\":\"上传的class文件名与要修改的表达式名不匹配！\"}");return;}if(count >= 1){version =  "" + (Integer.valueOf(bm.createQuery("select version form O where funcName=:funcName").setParameter("funcName", fileName.substring(0, fileName.length() - 6)).getSingleResult(false).getAttribute("version").getString()) + 1);}}System.out.println(globalDir+"cfClasses/customfunction");File write = new File(globalDir+"cfClasses/customfunction", fileName);if (write.getParentFile().exists() == false) {System.out.println("dir not exist");write.getParentFile().mkdirs();}write.createNewFile();InputStream ins = file.getInputStream();OutputStream ous = new FileOutputStream(write);try {byte[] buffer = new byte[1024];ARE.getLog().debug("开始写文件:" + fileName);int len = 0;while ((len = ins.read(buffer)) > -1)ous.write(buffer, 0, len);ARE.getLog().debug("已保存的文件:" + fileName);} catch (Exception e) {response.getWriter().print("{\"error\":\"文件保存失败\"}");} finally {ous.close();ins.close();}System.out.println("fileupload success!  name=" + fileName);MyFileClassLoader fileClsLoader = new MyFileClassLoader();fileClsLoader.setClassPath(globalDir + "cfClasses");boolean flag = false;int paramCount = 0;String funcTemplateName = fileName.substring(0,fileName.length()-6)+"Template";String funcTemplate = funcTemplateName + "(";try {Class cls = fileClsLoader.loadClass("customfunction."+fileName.substring(0,fileName.length()-6));Method[] mthds = cls.getMethods(); for(Method mthd : mthds){ String methodName = mthd.getName(); System.out.println("mthd.name="+methodName); if(methodName.equals(fileName.substring(0,fileName.length()-6)+"Template")){ flag = true; paramCount = mthd.getGenericParameterTypes().length; for (int i = 1; i <= paramCount; i++) { funcTemplate += "${"+ i + "},";} if(paramCount > 0){ funcTemplate = funcTemplate.substring(0,funcTemplate.length() - 1); } funcTemplate += ")"; } }} catch (ClassNotFoundException | IllegalArgumentException e) {ARE.getLog().error("解析class文件模板函数失败！", e);write.delete();response.getWriter().print("{\"error\":\"文件保存失败\"}");}if(!flag){write.delete();response.getWriter().print("{\"error\":\"class文件中不存在方法名为"+funcTemplateName+"的方法\"}");return;}BizObject obj = bm.newObject();obj.setAttributeValue("funcName", fileName.substring(0, fileName.length() - 6));obj.setAttributeValue("funcTemplate", funcTemplate);obj.setAttributeValue("version", version);obj.setAttributeValue("inputTime", StringFunction.getTodayNow());obj.setAttributeValue("updateTime", StringFunction.getTodayNow());bm.saveObject(obj);//=========================具体功能可忽略===========================response.getWriter().print("{}");  //成功时返回一个空json表示成功} else {System.out.println("file empty");response.getWriter().print("{\"error\":\"上传失败\"}");  //出错时返回一个包含error属性的json,前端控件会显示错误状态并输出对应信息}}}

图片展示

按钮

弹出模态框

成功

报错