ACTIVITI 自定义外置表单 formkey JSP

使用Activiti的时候，发现外外置表单需要将.form文件和流程一起打包部署。

实际应用时，感觉好麻烦。不能将流程和表单完全分离开，现将配置formkey 为JSP文件的做法分享，参考如下：

一、定义java Test FormEngine:

package me.kafeitu.activiti.chapter6.form;
import org.activiti.engine.ActivitiException;
import org.activiti.engine.delegate.VariableScope;
import org.activiti.engine.form.FormData;
import org.activiti.engine.form.StartFormData;
import org.activiti.engine.form.TaskFormData;
import org.activiti.engine.impl.context.Context;
import org.activiti.engine.impl.form.FormEngine;
import org.activiti.engine.impl.persistence.entity.ResourceEntity;
import org.activiti.engine.impl.persistence.entity.TaskEntity;
import org.activiti.engine.impl.scripting.ScriptingEngines;
import java.io.UnsupportedEncodingException;
public class TestFormEngine  implements FormEngine {
private static final  String NOT_FOUND_FORM_CONTENT_FLAG = "____NOT_FOUND_FORM___";
public TestFormEngine() {
        System.out.print("TestFormEngine init...............");
}
public String getName() {
return "juel";
}
public Object renderStartForm(StartFormData startForm) {
        System.out.print("renderStartForm...............");
if(startForm.getFormKey() == null) {
return null;
} else {
            String formTemplateString = this.getFormTemplateString(startForm, startForm.getFormKey());
System.out.print("formTemplateString..............."+formTemplateString);
if(NOT_FOUND_FORM_CONTENT_FLAG.equals(formTemplateString)){
return startForm.getFormKey();
}
            ScriptingEngines scriptingEngines = Context.getProcessEngineConfiguration().getScriptingEngines();
return scriptingEngines.evaluate(formTemplateString, "juel", (VariableScope)null);
}
    }
public Object renderTaskForm(TaskFormData taskForm) {
if(taskForm.getFormKey() == null) {
return null;
} else {
            String formTemplateString = this.getFormTemplateString(taskForm, taskForm.getFormKey());
if(NOT_FOUND_FORM_CONTENT_FLAG.equals(formTemplateString)){
return taskForm.getFormKey();
}
            ScriptingEngines scriptingEngines = Context.getProcessEngineConfiguration().getScriptingEngines();
TaskEntity task = (TaskEntity)taskForm.getTask();
return scriptingEngines.evaluate(formTemplateString, "juel", task.getExecution());
}
    }
protected String getFormTemplateString(FormData formInstance, String formKey) {
        String deploymentId = formInstance.getDeploymentId();
ResourceEntity resourceStream = Context.getCommandContext().getResourceEntityManager().findResourceByDeploymentIdAndResourceName(deploymentId, formKey);
if(resourceStream == null) {
// throw new ActivitiObjectNotFoundException("Form with formKey \'" + formKey + "\' does not exist", String.class);
return NOT_FOUND_FORM_CONTENT_FLAG;
} else {
byte[] resourceBytes = resourceStream.getBytes();
String encoding = "UTF-8";
String formTemplateString = "";
try {
                formTemplateString = new String(resourceBytes, encoding);
return formTemplateString;
} catch (UnsupportedEncodingException var9) {
throw new ActivitiException("Unsupported encoding of :" + encoding, var9);
}
        }
    }
}

二、Controller 中的方法如下：

/**
 * 读取启动流程的表单字段
 */
@RequestMapping(value = "getform/start/{processDefinitionId}")
public ModelAndView readStartForm(@PathVariable("processDefinitionId") String processDefinitionId) throws Exception {
    ProcessDefinition processDefinition = repositoryService.createProcessDefinitionQuery().processDefinitionId(processDefinitionId).singleResult();
boolean hasStartFormKey = processDefinition.hasStartFormKey();

// 根据是否有formkey属性判断使用哪个展示层
String viewName = "chapter6/start-process-form";
ModelAndView mav = new ModelAndView(viewName);
// 判断是否有formkey属性
if (hasStartFormKey) {
 Object renderedStartForm = formService.getRenderedStartForm(processDefinitionId);
        //Object renderedStartForm = formService.getRenderedStartForm(processDefinition.getId(), "juel");

mav.addObject("startFormData", renderedStartForm);
mav.addObject("processDefinition", processDefinition);
} else { // 动态表单字段
StartFormData startFormData = formService.getStartFormData(processDefinitionId);
mav.addObject("startFormData", startFormData);
}
    mav.addObject("hasStartFormKey", hasStartFormKey);
mav.addObject("processDefinitionId", processDefinitionId);
return mav;
}

三、JSP中的配置如下：

 

<c:if test="${hasStartFormKey}">
   <c:if test="${fn:endsWith(startFormData, '.jsp')}">
      <c:import url="${startFormData}" ></c:import>
   </c:if>
   <c:if test="${!fn:endsWith(startFormData, '.jsp')}">
${startFormData}
</c:if>
</c:if>

四、在流程定义中可以formKey:

<startEvent id="startevent1" name="Start" activiti:initiator="applyUserId" activiti:formKey="chapter6/leave-formkey/leave-start.form"></startEvent>

 

五、activiti.cfg.xml 中的配置如下：

<bean id="processEngineConfiguration" class="org.activiti.engine.impl.cfg.StandaloneProcessEngineConfiguration">
   <property name="jdbcUrl" value="jdbc:h2:file:~/activiti-in-action-chapter6;AUTO_SERVER=TRUE" />
   <property name="jdbcDriver" value="org.h2.Driver" />
   <property name="jdbcUsername" value="sa" />
   <property name="jdbcPassword" value="" />
   <property name="databaseSchemaUpdate" value="true" />
   <property name="jobExecutorActivate" value="false" />
<!-- 自定义表单引擎 -->
<property name="customFormEngines">
      <list>
         <bean class="me.kafeitu.activiti.chapter6.form.TestFormEngine" />
      </list>
   </property>
</bean>