流程图网页展示 _Web前端

流程图网页显示
package com.portal.web.sysadmin.flowadmin;

import java.io.InputStream;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.activiti.engine.repository.ProcessDefinition;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.ModelAndView;

import com.portal.pub.web.core.AbstractBaseController;

@Component("/sysadmin/flowadmin/FlowImageShow.html")
public class FlowImageShow extends AbstractBaseController {

	@Override
	public ModelAndView handleRequest(HttpServletRequest request,
			HttpServletResponse response) throws Exception {
		String processDefinitionId = request
				.getParameter("processDefinitionId");
		ProcessDefinition processDefinitioin = repositoryService
				.createProcessDefinitionQuery()
				.processDefinitionId(processDefinitionId).singleResult();
		String diagramResourceName = processDefinitioin
				.getDiagramResourceName();
		InputStream is = repositoryService.getResourceAsStream(
				processDefinitioin.getDeploymentId(), diagramResourceName);
		byte[] b = new byte[1024];
		int len = -1;
		while ((len = is.read(b, 0, 1024)) != -1) {
			response.getOutputStream().write(b, 0, len);
		}
		return null;
	}

}