使用Freemarker和Struts2做动态表单
由于项目中需要用到一个可定制的动态表单功能，管理员可以根据需要定制定出想要的表单，参考了一些视频和网上资料，自己做了一个动态电子表单模块。
//FreemarkerManage 的初始配置 public class FreemarkerManage {private static String ENCODING="UTF-8";private static Configuration cfg=new Configuration();static{//定义模板的位置cfg.setTemplateLoader(new ClassTemplateLoader(FreemarkerManage.class,"templates"));cfg.setObjectWrapper(new DefaultObjectWrapper());//设置异常cfg.setTemplateExceptionHandler(TemplateExceptionHandler.IGNORE_HANDLER);cfg.setEncoding(Locale.CHINA, ENCODING);}public static Configuration getConfiguration(){return cfg;}}@Componentpublic class DynaFormFunction {private static String defaultTemplate = "document_form.ftl";private static String showTemplate = "showform.ftl";private static String initForm = "initForm.ftl";private static FlowFormManageService flowFormManageService;private static FormInstanceWebService formInstanceWebService;private static ReportJobWebService reportJobWebService;/*** * 初始化表单信息,将数据放到模板中 * @param workflowId * @return */public static String form(long workflowId) { FlowForm flowForm = flowFormManageService.findFlowFormById(workflowId);if (null == flowForm) {return null;}/** * 加载freemarker的配置 */Configuration configuration = FreemarkerManage.getConfiguration();try {/** * 加载表单模板文件 */Template template = configuration.getTemplate(document_form);Writer writer = new StringWriter();Map root = new HashMap();root.put("form", flowForm);/** * 将模板与数据进行相结合 */template.process(root, writer);return writer.toString();} catch (Exception e) {e.printStackTrace();}return null;}/** * 显示动态表单的值 * @param formInstanceId * @return */public static String showForm(long formInstanceId) { try {FormInstanceDTO formInstanceDTO = formInstanceWebService.findFormInstanceById(formInstanceId);if (null == formInstanceDTO) {return null;}/** * 加载freemarker的配置 */Configuration configuration = FreemarkerManage.getConfiguration();/** * 获取动态表单的实例数据 */Map<Long, Object> dataInstance = formInstanceDTO.getInstanceData();Map<String, Object> newDataInstance = reportJobWebService.findFlowFormData(dataInstance);/** * 根据配置加载模板 */Template template = configuration.getTemplate(showTemplate);Writer writer = new StringWriter();Map root = new HashMap();root.put("showForm", newDataInstance);/** * 将模板与数据进行结合 */template.process(root, writer);return writer.toString();} catch (Exception e) {e.printStackTrace();}return null; }}模板文件的编写(1).initForm.ftl的编写<table><#assign i=0><#assign dataValue=""><#list form.formFields as field><#assign i=i+1><#if field_index % 2 = 0><tr></#if><td colspan="2" valign="top"><span encoding="UTF-8" ?><taglib xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd" version="2.0"> <tlib-version>1.0</tlib-version> <short-name>my</short-name> <uri>http://www.gosophia.com/oa/functions</uri> <function> <name>form</name> <function-class>com.gosophia.reportData.action.DynaFormFunction</function-class> <function-signature>java.lang.String form(long)</function-signature> </function> <function> <name>showForm</name> <function-class>com.gosophia.reportData.action.DynaFormFunction</function-class> <function-signature>java.lang.String showForm(long)</function-signature> </function></taglib>/****在web.xml文件进行配置*/<jsp-config><taglib><taglib-uri>http://www.gosophia.com/myfunctions</taglib-uri><taglib-location>/WEB-INF/my.tld</taglib-location></taglib></jsp-config>在jsp页面显示，并且引进tld文件 /** * *初始化电子表单页面 *///先在jsp页面引进自己的标签<%@taglib prefix="my" uri="http://www.gosophia.com/oa/functions"%>//在jsp直接引入就可以 ${my:form(flowForm.formId)} /** *动态显示电子表单内容 * *///先在jsp页面引进自己的标签<%@taglib prefix="my" uri="http://www.gosophia.com/oa/functions"%>//显示动态表单中数据${my:showForm(approvalReportJobDto.reportJobDto.formInstanceId)}