ueditor上传附件显示服务器返回错误

ueditor上传附件显示服务器返回错误，

百度了很多，基本是json错误的原因，可是我将我的json字符串在线转是可以的

后来将

response.getWriter().print("{'url':'" + up.getUrl() + "','fileType':'" + up.getType() + "','title':'" + up.getOriginalName() + "'," +
        "'state':'" + up.getState() + "','original':'" + up.getOriginalName() + "'}");

改为下列就好了

response.getWriter().print("{\"url\":\"" + up.getUrl() + "\",\"fileType\":\"" + up.getType() + "\",\"title\":\"" + up.getOriginalName() + "\"," +
        "\"state\":\"" + up.getState() + "\",\"original\":\"" + up.getOriginalName() + "\"}");

花了好多时间解决，没想到最后这么简单。还是记录一下，谨记！