Activiti6.0.0及以上版本集成Activiti Modeler

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添加maven引用

<dependency>
    <groupId>org.apache.xmlgraphics</groupId>
    <artifactId>batik-transcoder</artifactId>
    <version>1.7</version>
</dependency>
<dependency>
    <groupId>org.apache.xmlgraphics</groupId>
    <artifactId>batik-codec</artifactId>
    <version>1.7</version>
</dependency>
<dependency>
    <groupId>org.activiti</groupId>
    <artifactId>activiti-json-converter</artifactId>
    <version>6.0.0</version>
</dependency>

ModelEditorJsonRestResource

import org.activiti.engine.ActivitiException;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.repository.Model;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;

/**
 * @author Tijs Rademakers
 */
@RestController
public class ModelEditorJsonRestResource{

  protected static final Logger LOGGER = LoggerFactory.getLogger(ModelEditorJsonRestResource.class);

  @Autowired
  private RepositoryService repositoryService;

  @Autowired
  private ObjectMapper objectMapper;

  @RequestMapping(value="/model/{modelId}/json", method = RequestMethod.GET, produces = "application/json")
  public ObjectNode getEditorJson(@PathVariable String modelId) {
    ObjectNode modelNode = null;

    Model model = repositoryService.getModel(modelId);

    if (model != null) {
      try {
        if (StringUtils.isNotEmpty(model.getMetaInfo())) {
          modelNode = (ObjectNode) objectMapper.readTree(model.getMetaInfo());
        } else {
          modelNode = objectMapper.createObjectNode();
          modelNode.put("name", model.getName());
        }
        modelNode.put("modelId", model.getId());
        ObjectNode editorJsonNode = (ObjectNode) objectMapper.readTree(
            new String(repositoryService.getModelEditorSource(model.getId()), "utf-8"));
        modelNode.put("model", editorJsonNode);

      } catch (Exception e) {
        LOGGER.error("Error creating model JSON", e);
        throw new ActivitiException("Error creating model JSON", e);
      }
    }
    return modelNode;
  }
}

ModelSaveRestResource

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;

import org.activiti.engine.ActivitiException;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.repository.Model;
import org.apache.batik.transcoder.TranscoderInput;
import org.apache.batik.transcoder.TranscoderOutput;
import org.apache.batik.transcoder.image.PNGTranscoder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestController;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;

/**
 * @author Tijs Rademakers
 */
@RestController
public class ModelSaveRestResource {

  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("name", name);
      modelJson.put("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);
    }
  }
}

StencilsetRestResource

import java.io.InputStream;

import org.activiti.engine.ActivitiException;
import org.apache.commons.io.IOUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author Tijs Rademakers
 */
@RestController
public class StencilsetRestResource {

  @RequestMapping(value="/editor/stencilset", method = RequestMethod.GET, produces = "application/json;charset=utf-8")
  public @ResponseBody String getStencilset() {
    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);
    }
  }
}

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