activiti5 開發

你們在開發過程，能夠參考不少網上的案例，說到集成開發，其實能夠直接參考activiti提供給咱們的activiti-rest-5.18.0，這個jar原本是提供rest接口，你們在開發過程若是想使用什麼api其實能夠直接參考這個jar的源碼，基本都提供了，很方便也不用去看什麼代碼。

在集成的時候，可能須要activiti-diagram-rest-5.18.0 這個jar是給js生成流程圖的接口，你們若是沒有使用diagram-viewer這個作流程圖，能夠不須要引入。

還有在集成modeler的時候activiti-modeler-5.18.0只要這個jar便可，這個jar提供了modeler的保存和查詢接口。

順便說一下，5.18版本的modeler支持了ie8可是在保存的時候可能會出現錯誤。

跟蹤接口發現是在activiti-modeler-5.18.0的jar中保存接口出錯，實際上是在保存svg_xml解析生成圖片的時候猶豫ie8生成的xml字符串不對出錯。其實這裏能夠不須要svg_xml生成圖片註釋掉，並且這裏使用了batik-codec-1.7生成圖片，其實能夠不須要。

/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.activiti.rest.editor.model;

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

import org.activiti.editor.constants.ModelDataJsonConstants;
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.util.MultiValueMap;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
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 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, @RequestBody MultiValueMap<String, String> values) {
    try {
      
      Model model = repositoryService.getModel(modelId);
      
      ObjectNode modelJson = (ObjectNode) objectMapper.readTree(model.getMetaInfo());
      
      modelJson.put(MODEL_NAME, values.getFirst("name"));
      modelJson.put(MODEL_DESCRIPTION, values.getFirst("description"));
      model.setMetaInfo(modelJson.toString());
      model.setName(values.getFirst("name"));
      
      repositoryService.saveModel(model);
      
      repositoryService.addModelEditorSource(model.getId(), values.getFirst("json_xml").getBytes("utf-8"));
      
     /* InputStream svgStream = new ByteArrayInputStream(values.getFirst("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);
    }
  }
}

這樣就是在保存modeler以後不會再數據庫生成圖片的資源，不過這裏推薦一種，就是日常用model生成的json部署的時候使用bpmn的生成圖片方法activiti-image-generator-5.18.0 這樣既能夠不用引入batik的jar，也能夠使用activiti的jar便可，並且和流程定義的生成圖是同樣。