请问用junit怎样为下面代码编写用例呢？新人求教。最好弄个模板出来。

@RequestMapping(value = "/addAdv", produces = "text/html;charset=utf-8")
@ResponseBody
public String addAdvAction(HttpServletRequest request, HttpServletResponse response) {
    JSONObj json = new JSONObj();

    String advContent = request.getParameter("advContent");
    String advImgPath = request.getParameter("advImgPath");
    String advTitle = request.getParameter("advTitle");
    String advTypeStr = request.getParameter("advType");

    try {
        int advType = Integer.parseInt(advTypeStr);
        advService.addAdv(advContent, advImgPath, advTitle, advType);
        json.setCode("success");
        json.setMsg("添加成功");
    } catch (Exception e) {
        logger.error(e);
        e.printStackTrace();

        json.setCode("failure");
        json.setMsg("添加失败");
    }
    return json.toString();
}

ent = request.getParameter("advContent");
String advImgPath = request.getParameter("advImgPath");
String advTitle = request.getParameter("advTitle");
String advTypeStr = request.getParameter("advType");

try {
    int advType = Integer.parseInt(advTypeStr);
    advService.addAdv(advContent, advImgPath, advTitle, advType);
    json.setCode("success");
    json.setMsg("添加成功");
} catch (Exception e) {