表单

⚠️ **Activiti7 **移除了 IdentityService 和 FormService 。因此对于 Activiti6 官方文档提供的实例代码无法在7中使用。

和表单结合的意思就是在流程中，手动添加表单，类似于人工卡点的意思。表单形式有两种：

1. 自带

2. 自定义。

实际使用时，一般使用 【② 自定义】 方式。这同 Java 语法中的基本类型和引用类型一样，既有内置也可自定义。

All information relevant to a business process is either included in the process variables themselves or referenced through the process variables 📝 在Activiti7中，所有业务相关的信息（数据）都是通过流程变量呈现的：

Map<String,String>

捋清表单属性与流程变量的映射关系，是实现工作流表单引擎的关键：

Properties are derived from process variables, but they don’t have to be stored as process variables. For example, a process variable could be a JPA entity of class Address. And a form property StreetName used by the UI technology could be linked with an expression #{address.street}

Analogue, the properties that a user is supposed to submit in a form can be stored as a process variable or as a nested property in one of the process variables with a UEL value expression like e.g. #{address.street} .

Analogue the default behavior of properties that are submitted is that they will be stored as process variables unless a formProperty declaration specifies otherwise. 📝 默认情况下，表单属性会当做流程变量进行存储，除非使用formProperty进行额外声明。

Also type conversions can be applied as part of the processing between form properties and process variables.

其他XML示例：

官方示例2

<startEvent id="start">
  <extensionElements>
    <activiti:formProperty id="speaker"
      name="Speaker"
      variable="SpeakerName"
      type="string" />

    <activiti:formProperty id="start"
      type="date"
      datePattern="dd-MMM-yyyy" />

    <activiti:formProperty id="direction" type="enum">
      <activiti:value id="left" name="Go Left" />
      <activiti:value id="right" name="Go Right" />
      <activiti:value id="up" name="Go Up" />
      <activiti:value id="down" name="Go Down" />
    </activiti:formProperty>

  </extensionElements>
</startEvent>

官方示例2

<startEvent>
  <extensionElements>
    <activiti:formProperty id="numberOfDays" name="Number of days" value="${numberOfDays}" type="long" required="true"/>
    <activiti:formProperty id="startDate" name="First day of holiday (dd-MM-yyy)" value="${startDate}" datePattern="dd-MM-yyyy hh:mm" type="date" required="true" />
    <activiti:formProperty id="vacationMotivation" name="Motivation" value="${vacationMotivation}" type="string" />
  </extensionElements>
</userTask>

在activiti7中使用表单