Activiti系列（二）集成Activiti Modeler

Activiti6.0.0及以上版本与activiti-modeler的maven引用有冲突，解决方法参考
Activiti6.0.0及以上版本集成Activiti Modeler

1.下载源文件

activiti-5.22.0官方Demo

activiti5.22.0源码

2.copy源文件

• （一）复制前端文件

解压activiti-5.22.0官方Demo

解压activiti-explorer.war

复制editor-app,diagram-viewer文件夹，以及modele.html到本地项目

• （2）复制服务端文件

解压activiti5.22.0源码

复制ModelEditorJsonRestResource.java,ModelSaveRestResource.java,StencilsetRestResource.java到控制层文件夹下

3.添加maven引用

<dependency>
	<groupId>org.activitigroupId>
	<artifactId>activiti-modelerartifactId>
	<version>5.22.0version>
dependency>

4.启动项目,访问modeler页面

http://localhost:8080/modeler.html

修改启动类，屏蔽登录功能

@SpringBootApplication
@EnableAutoConfiguration(exclude = {
		org.springframework.boot.autoconfigure.security.SecurityAutoConfiguration.class,
		org.activiti.spring.boot.SecurityAutoConfiguration.class,
})
public class DemoApplication {

	public static void main(String[] args) {
		SpringApplication.run(DemoApplication.class, args);
	}
}

再次访问modeler页面

处理 /activiti-explorer/service/model//json 请求的报错

该请求的控制类为ModelEditorJsonRestResource.java

@RequestMapping(value="/model/{modelId}/json", method = RequestMethod.GET, produces = "application/json")

在/public/editor-app/app-cfg.js文件中修改请求的地址

ACTIVITI.CONFIG = {
	//'contextRoot' : '/activiti-explorer/service',
	'contextRoot' : '',
};

再次访问modeler页面

报错GET http://localhost:8080/model//json 404 ()
这是因为我们没有已经建好的model模型，无法查看

5.新建model

测试类

@Controller
@RequestMapping("model")
public class ModelTest {

    @RequestMapping("create")
    public void createModel(HttpServletRequest request, HttpServletResponse response){
        try{
            String modelName = "modelName";
            String modelKey = "modelKey";
            String description = "description";

            ProcessEngine processEngine = ProcessEngines.getDefaultProcessEngine();

            RepositoryService repositoryService = processEngine.getRepositoryService();

            ObjectMapper objectMapper = new ObjectMapper();
            ObjectNode editorNode = objectMapper.createObjectNode();
            editorNode.put("id", "canvas");
            editorNode.put("resourceId", "canvas");
            ObjectNode stencilSetNode = objectMapper.createObjectNode();
            stencilSetNode.put("namespace", "http://b3mn.org/stencilset/bpmn2.0#");
            editorNode.put("stencilset", stencilSetNode);
            Model modelData = repositoryService.newModel();

            ObjectNode modelObjectNode = objectMapper.createObjectNode();
            modelObjectNode.put(ModelDataJsonConstants.MODEL_NAME, modelName);
            modelObjectNode.put(ModelDataJsonConstants.MODEL_REVISION, 1);
            modelObjectNode.put(ModelDataJsonConstants.MODEL_DESCRIPTION, description);
            modelData.setMetaInfo(modelObjectNode.toString());
            modelData.setName(modelName);
            modelData.setKey(modelKey);

            //保存模型
            repositoryService.saveModel(modelData);
            repositoryService.addModelEditorSource(modelData.getId(), editorNode.toString().getBytes("utf-8"));
            response.sendRedirect(request.getContextPath() + "/modeler.html?modelId=" + modelData.getId());
        }catch (Exception e){
        }
    }

}

访问localhost:8080/model/create

处理http://localhost:8080/editor/stencilset?version=1523329753442请求的报错

在StencilsetRestResource.java中，我们项目中少了stencilset.json

@RestController
public class StencilsetRestResource {
  
  @RequestMapping(value="/editor/stencilset", method = RequestMethod.GET, produces = "application/json;charset=utf-8")
  public @ResponseBody String getStencilset() {
  //stencilset.json为Model中的工具栏的名称字符，这里在resources下面查找
    InputStream stencilsetStream = this.getClass().getClassLoader().getResourceAsStream("stencilset.json");
    try {
      return IOUtils.toString(stencilsetStream, "utf-8");
    } catch (Exception e) {
      throw new ActivitiException("Error while loading stencil set", e);
    }
  }
}

下载stencilset.json，并放置在resources目录下
再次访问localhost:8080/model/create

6.保存Model

处理http://localhost:8080/model/102503/save的报错

修改ModelSaveRestResource.java为

@RestController
public class ModelSaveRestResource implements ModelDataJsonConstants {
  
  protected static final Logger LOGGER = LoggerFactory.getLogger(ModelSaveRestResource.class);

  @Autowired
  private RepositoryService repositoryService;
  
  @Autowired
  private ObjectMapper objectMapper;
  
  @RequestMapping(value="/model/{modelId}/save", method = RequestMethod.PUT)
  @ResponseStatus(value = HttpStatus.OK)
  public void saveModel(@PathVariable String modelId, String name, String description, String json_xml, String svg_xml) {
    try {

      Model model = repositoryService.getModel(modelId);

      ObjectNode modelJson = (ObjectNode) objectMapper.readTree(model.getMetaInfo());

      modelJson.put(MODEL_NAME, name);
      modelJson.put(MODEL_DESCRIPTION, description);
      model.setMetaInfo(modelJson.toString());
      model.setName(name);

      repositoryService.saveModel(model);

      repositoryService.addModelEditorSource(model.getId(), json_xml.getBytes("utf-8"));

      InputStream svgStream = new ByteArrayInputStream(svg_xml.getBytes("utf-8"));
      TranscoderInput input = new TranscoderInput(svgStream);

      PNGTranscoder transcoder = new PNGTranscoder();
      // Setup output
      ByteArrayOutputStream outStream = new ByteArrayOutputStream();
      TranscoderOutput output = new TranscoderOutput(outStream);

      // Do the transformation
      transcoder.transcode(input, output);
      final byte[] result = outStream.toByteArray();
      repositoryService.addModelEditorSourceExtra(model.getId(), result);
      outStream.close();

    } catch (Exception e) {
      LOGGER.error("Error saving model", e);
      throw new ActivitiException("Error saving model", e);
    }
  }
}

再次保存，保存成功。Activiti Modeler集成成功

• 源码下载