java之初识服务器跨域获取数据

$.ajax({
        type : "get", //jquey是不支持post方式跨域的
        async:false,
        url : "http://192.168.0.113:8080/test/", //跨域请求的URL
        dataType : "jsonp",
        //传递给请求处理程序，用以获得jsonp回调函数名的参数名(默认为:callback)
        jsonp: "callback",
        //自定义的jsonp回调函数名称，默认为jQuery自动生成的随机函数名
        jsonpCallback:"success_jsonpCallback",
        //成功获取跨域服务器上的json数据后,会动态执行这个callback函数
        success : function(json){ 
          alert(json.name); 
        } 
    }); 

public class ServletTest extends HttpServlet {

    private final String gdtcUrl = "http://www.xxxxx
.cn/";
    /**
     * 毫秒
     */
    private final long delayTime = 60 * 1000;

    /**
     * 定时器
     */
    private Timer mTimer = null;

    /**
     * 缓存json
     */
    private String cashJson = null;

    @Override
    public void init() throws ServletException {
        String params = getInitParameter("iniParam");
        System.out.println(params);

        mTimer = new Timer();
        mTimer.schedule(new TimerTask() {

            @Override
            public void run() {
                List<ModuleBean> datas = JdbcConnection.getFast5Hm();
                cashJson = JSON.toJSONString(datas);
                System.out.println("数据定时来了：" + cashJson);
            }
        }, 0, delayTime);
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        resp.setCharacterEncoding("GBK");
        resp.setContentType("text/plain;charset=UTF-8");
        String referer = req.getHeader("Referer");
        System.out.println("来访地址：" + referer);
        if (referer != null && referer.startsWith(gdtcUrl)) {
            // 当缓存为空时，请求一次数据库
            if (cashJson == null) {
                cashJson = JSON.toJSONString(JdbcConnection.getFast5Hm());
            }
　　　　　　　　
            String renderStr = req.getParameter("callback") + "(" + cashJson
                    + ")";
            resp.getWriter().write(renderStr);

        } else {
            resp.getWriter().write("error of no authority");
        }
        resp.getWriter().flush();
    }
}