getOutputStream() has already been called for this response 异常处理

在使用完输出流以后调用以下两行代码即可：
out.clear();
out = pageContext.pushBody();

 

如输出图片

 <%
   JbpmContext jbpmContext= JbpmConfiguration.getInstance().createJbpmContext();
    ProcessDefinition pd = jbpmContext.getGraphSession().findLatestProcessDefinition("abl");
    FileDefinition fd = pd.getFileDefinition();
    byte[] bytes = fd.getBytes("processimage.jpg");

 
 response.setContentType("image/jpeg");
 response.getOutputStream().write(bytes);
 out.clear();
 out = pageContext.pushBody();
 
   %>