【入门篇】Activiti流程资源文件下载保存到本地

需求

用户或者开发人员，有时候需要对绘制好的流程文件进行查看

参考数据库



方案

根据流程标识，查找流程定义表，然后读取到跟这个流程有关的文件，然后保存到本地或者给出界面显示，目前只做保存到本地

代码

//流程定义资源文件查询
@Test
public void queryProcessDefinitionResource() throws IOException{
//得到repositoryService
RepositoryService repositoryService = processEngine.getRepositoryService();

//根据流程定义id查询部署id
String processDefinitionId = "purchasingflow:1:4";
ProcessDefinition processDefinition = repositoryService
.createProcessDefinitionQuery()
.processDefinitionId(processDefinitionId).singleResult();
//部署id
String deploymentId = processDefinition.getDeploymentId();

//bpmn文件
//bpmn资源文件名称
String resourceName_bpmn = processDefinition.getResourceName();
//bpmn资源文件输入流
InputStream inputStream_bpmn = repositoryService.getResourceAsStream(deploymentId, resourceName_bpmn);

//png文件
//png文件名称
String resourceName_png = processDefinition.getDiagramResourceName();
//png资源文件输入流
InputStream inputStream_png = repositoryService.getResourceAsStream(deploymentId, resourceName_png);

//构造输入流
File file_bpmn = new File("d:/" + resourceName_bpmn);
File file_png = new File("d:/" + resourceName_png);

FileOutputStream fileOutputStream_bpmn = new FileOutputStream(file_bpmn);
FileOutputStream fileOutputStream_png = new FileOutputStream(file_png);

//流复制
byte[] b = new byte[1024];
int len = -1;
while((len = inputStream_bpmn.read(b,0,1024)) != -1){
fileOutputStream_bpmn.write(b,0,len);
}

while((len = inputStream_png.read(b,0,1024)) != -1){
fileOutputStream_png.write(b,0,len);
}

//关闭流
inputStream_bpmn.close();
inputStream_png.close();
fileOutputStream_bpmn.close();
fileOutputStream_png.close();
}
效果图