Struts2.x后台如何向前端发送Json

jQuery如何接受json串：

http://blog.youkuaiyun.com/javaacmer/article/details/8829635

Struts2.x后台发送json串的Action方法：

看代码：return null

    public String dedimensionslist() throws IOException {
        String pk_father = pk_dedimensions;
        dedimensionslist = this.dedimensions.childrenlist(pk_father);
        Map jsonMap = new HashMap();
        jsonMap.put("children", dedimensionslist);
        jsonMap.put("message", "success");
        jsonMap.put("statusCode", 200);
        String jsonString = JSONObject.fromObject(jsonMap).toString();
        PrintWriter pt =this.getResponse().getWriter();
        pt.write(jsonString);
        return null;
    }

需要的jar包：

         json-lib-2.2.2-jdk15.jar

        commons-beanutils-1.7.0.jar

        commons-collections-3.2.jar

        commons-lang.jar

        commons-logging-1.1.jar

        ezmorph-1.0.4.jar