spring+json+jquery

Spring与JSON当输出中文有乱码时，可以直接在@RequestMapping(produces="application/json;charset=UTF-8")中加上produces即可解决。

我在使用@ResponseBody String返回JSON数据时老是给我报错:JSON.parse() expected property name or '}',搞了很久才找到原因,需要把单引号改成双引号就可以解决问题!

@RequestMapping(value = "/home/getCategories", method = RequestMethod.GET,produces="application/json;charset=UTF-8")
    public @ResponseBody String getCategories(HttpSession session) {
        User user = (User) session.getAttribute("user");
        Set<Category> catsSet = user.getCategories();
        StringBuilder sb = new StringBuilder();
        sb.append("[");
        int i = 0;
        for (Category cat : catsSet) {
            sb.append("{\"id\":" + cat.getId() + ",\"name\":\"" + cat.getName()
                    + "\"}");
            i++;
            if (i < catsSet.size())
                sb.append(",");
            
            logger.info(cat.getName());
        }
        sb.append("]");
        logger.info(sb.toString());
        return sb.toString();
    }