Question

activiti modeler 怎么将设计的流程保存到后台的？后台哪里接收的？

把activiti里面的activiti-explorer.war项目里的activiti modeler 模块抽离出来整合到自己的项目中，可是不知道后台是怎么接收activiti modeler画的流程定义的数据的？谁懂解释一下

Answer 1

package org.activiti.editor.rest.model;

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

import org.activiti.editor.constants.ModelDataJsonConstants;
import org.activiti.engine.ProcessEngines;
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.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.node.ObjectNode;
import org.restlet.data.Form;
import org.restlet.data.Status;

import org.restlet.resource.Put;
import org.restlet.resource.ServerResource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import sun.misc.BASE64Encoder;
/**
 * @author Tijs Rademakers
 */
public class ModelSaveRestResource extends ServerResource implements
		ModelDataJsonConstants {

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

	@Put
	public void saveModel(Form modelForm) {
		ObjectMapper objectMapper = new ObjectMapper();
		String modelId = (String) getRequest().getAttributes().get("modelId");
		// System.out.println("json " + modelForm.getFirstValue("json_xml"));

		try {

			/*
			 * ObjectNode modelNode = (ObjectNode)
			 * objectMapper.readTree(modelForm.getFirstValue("json_xml"));
			 * JsonToBpmnExport converter = new JsonToBpmnExport(modelNode);
			 * byte[] bpmnBytes = converter.convert();
			 * System.out.println("bpmn " + new String(bpmnBytes));
			 */

			RepositoryService repositoryService = ProcessEngines
					.getDefaultProcessEngine().getRepositoryService();
			Model model = repositoryService.getModel(modelId);

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

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

					
			byte[] svg_xml=modelForm.getFirstValue("svg_xml").getBytes("UTF-8");
		
			
			//转成UTF-8 然后使用base64编码
			String gbk=new String(modelForm.getFirstValue("json_xml").getBytes("GBK"));
			String iso = new String(gbk.getBytes("UTF-8"),"ISO-8859-1");
			String utf8=new String(iso.getBytes("ISO-8859-1"),"UTF-8");
			byte[]  json_xml=new BASE64Encoder().encode(utf8.getBytes("UTF-8")).getBytes();
			repositoryService.addModelEditorSource(model.getId(),json_xml);
			
			
			
			InputStream svgStream = new ByteArrayInputStream(svg_xml);
			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();
				
			repositoryService.saveModel(model);
			
		} catch (Exception e) {
			LOGGER.error("Error saving model", e);
			setStatus(Status.SERVER_ERROR_INTERNAL);
		}
	}
}