BPMN2.0脚本任务

本文主要是介绍BPMN2.0脚本任务，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1. 脚本任务

• JUEL脚本（默认）（Java Unified Expression Lanaguage Java统一表达语言）

• Groovy脚本（依赖groovy-all.jar）

• JavaScript脚本

<scriptTask id="scripttask" name="Script Task"><script>${bean.invoke()}</script>
</scriptTask>

2. 脚本任务（Script Task）内置变量

添加依赖：

<dependency><groupId>org.codehaus.groovy</groupId><artifactId>groovy-all</artifactId>
</dependency>

内置变量 execution, xxxService, processEngineConfiguration

保留关键字，不能用作变量使用：out, out:print, lang:Import, context, elcontext

3. 脚本任务（Script Task）设置返回值

JUEL：

JavaScript:

（1）使用groovy脚本

测试代码

my-process-scripttask1.bpmn20.xml中部分代码：

<process id="my-process"><startEvent id="start" />
<sequenceFlow id="flow1" sourceRef="start" targetRef="someTask" /><scriptTask id="someTask" name="Script Task"
scriptFormat="groovy"><script>def myValue = "value123"execution.setVariable("myKey", myValue)</script>
</scriptTask>
<sequenceFlow id="flow2" sourceRef="someTask" targetRef="end" /><endEvent id="end" />
</process>

测试代码：

public class ScriptTaskTest {
private static final Logger LOGGER = LoggerFactory.getLogger(ScriptTaskTest.class);@Rule
public ActivitiRule activitiRule = new ActivitiRule();@Test
@Deployment(resources = {"my-process-scripttask1.bpmn20.xml"})
public void testUserTask(){ProcessInstance processInstance = activitiRule.getRuntimeService().startProcessInstanceByKey("my-process");HistoryService historyService = activitiRule.getHistoryService();List<HistoricVariableInstance> historicVariableInstances = historyService.createHistoricVariableInstanceQuery().processInstanceId(processInstance.getId()).orderByVariableName().asc().listPage(0, 100);for(HistoricVariableInstance historicVariableInstance : historicVariableInstances){LOGGER.info("variable = {}", historicVariableInstance);}LOGGER.info("variables.size = {}", historicVariableInstances.size());}
}

测试输出：

（2）使用JUEL脚本（设置返回值）：

<process id="my-process"><startEvent id="start" />
<sequenceFlow id="flow1" sourceRef="start" targetRef="someTask" /><scriptTask id="someTask" name="Script Task" scriptFormat="juel" activiti:resultVariable="mySum"><script>#{key1 + key2}</script>
</scriptTask>
<sequenceFlow id="flow2" sourceRef="someTask" targetRef="end" /><endEvent id="end" />
</process>

测试代码：

@Test
@Deployment(resources = {"my-process-scripttask2.bpmn20.xml"})
public void testScriptTask2(){Map<String, Object> variables = Maps.newHashMap();variables.put("key1", 3);variables.put("key2", 5);ProcessInstance processInstance = activitiRule.getRuntimeService().startProcessInstanceByKey("my-process", variables);HistoryService historyService = activitiRule.getHistoryService();List<HistoricVariableInstance> historicVariableInstances = historyService.createHistoricVariableInstanceQuery().processInstanceId(processInstance.getId()).orderByVariableName().asc().listPage(0, 100);for(HistoricVariableInstance historicVariableInstance : historicVariableInstances){LOGGER.info("variable = {}", historicVariableInstance);}LOGGER.info("variables.size = {}", historicVariableInstances.size());}

测试输出：

（3）使用JavaScript脚本

只需要将（2）中流程定义文件中的脚本类型改为javascript，脚本内容改为key1 + key2

<scriptTask id="someTask" name="Script Task"
scriptFormat="javascript" activiti:resultVariable="mySum"><script>key1 + key2</script>
</scriptTask>

测试输出：

可以用脚本实现的就定义在脚本定义文件里面，避免修改java代码。

这篇关于BPMN2.0脚本任务的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！

---