activiti shell 任务

拼搏现实的明天。 2022-05-15 20:07 254阅读 0赞

shell 任务用于执行shell 脚本，在Service TAsk 中配置 ，可以用javaf提供的api来执行shell命令
    需要使用java.lang.Runtime为原exec()执行shell，也可用java.lang.ProcessBuilder来执行
    
    ProcessBuilder例子：
    public class JavaShellTest{
    	public static void main(String[] args) throws IOException {
    		List<String> list=new ArrayList<>();
    		list.add("cmd");
    		list.add("/c");
    		list.add("echo");
    		list.add("hello");
    		
    		ProcessBuilder builder=new ProcessBuilder(list);
    		//执行命令
    		Process process = builder.start();
    		String result=convertStream(process.getInputStream());
    		System.out.println(result);
    	}
    	
    	public static String convertStream(InputStream is) throws IOException{
    		if(is!=null) {
    			Writer writer=new StringWriter();
    			char[] buffer =new char[1024];
    			try {
    				Reader reader= new BufferedReader(new InputStreamReader(is, "UTF-8"));
    				int n;
    				while((n=reader.read(buffer))!=-1) {
    					writer.write(buffer,0,buffer.length);
    				}
    			}finally {
    				is.close();
    			}
    			return writer.toString();
    		}else {
    			return "";
    		}
    	}
    
    
    
    2. 现在在bpmn中添加配置
    <serviceTask id="serviceTask1" name="service task" activiti:type="shell">
        <extensionElement>
            <activiti:field name="command" stringValue="cmd"/>
            <activiti:field name="arg1" stringValue="/c"/>
            <activiti:field name="arg2" stringValue="echo"/>
            <activiti:field name="arg3" stringValue="%JAVA_HOME%"/>
            <activiti:field name="outputVariable" stringValue="javaHome"/>
        </extensionElement>
    </serviceTask>
    
    
    3. 通过runtimeService获取就行了
    ProcessDefinition pd=rs.createProcessDefinitionQuery().deployment(deploy.getId()).singleResult();
    
    ProcessInstance pi=runtimeService.startProcessInstanceById(pd.getId());
    
    runtimeService.getVariable(pi.getId(),"javaHome");