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Spring MVC 学习 之 - URL参数传递

  在学习 Spring Mvc 过程中,有必要来先了解几个关键参数:

   @Controller:

         在类上注解,则此类将编程一个控制器,在项目启动 Spring 将自动扫描此类,并进行对应URL路由映射。

@Controllerpublic class UserAction {   }

  @RequestMapping

         指定URL映射路径,如果在控制器上配置 RequestMapping  ,具体请求方法也配置路径则映射的路径为两者路径的叠加 常用映射如:RequestMapping("url.html")

        配置映射路径:

 

@Controllerpublic class UserAction {    @RequestMapping(value = "/get_alluser.html")   public ModelAndView GetAllUser(String Id)   {   }}

     以上配置映射

     http://***:8080:web1/get_alluser.html:

         如在 @Controller添加 @RequestMapping(value = "http://www.mamicode.com/user"),则映射路径变成

          http://***:8080:web1/user/get_alluser.html

   @ResponseBody

      将注解方法对应的字符串直接返回

   @RequestParam

      自动映射URL对应的参数到Action上面的数值,RequestParam 默认为必填参数

    

   @PathVariable

      获取@RequestMapping 配置指定格式的URL映射参数

     

     /*      *   直接输出 HTML,或JSON 字符串      *   请求路径:      *       /web1/urlinfo/getcontent.html?key=rhythmk      *      /web1/urlinfo/getcontent.json?key=rhythmk      * */    @ResponseBody    @RequestMapping(value = "/getcontent.**")    public String GetContent(            @RequestParam("key") String key,            @RequestParam(value = "key2", required = false, defaultValue = "http://www.mamicode.com/defaultValue") String key2) {        System.out.println("getcontent 被调用");        String result = "直接返回内容  - key:" + key + ",key2:" + key2;        System.out.println(result);        return result;    }

 

    /*     * RequestMapping 支持 Ant 风格的URL配置 :     *  请求路径:     *     /urlinfo/geturlant/config.html?key=adddd     */    @ResponseBody    @RequestMapping(value = "/geturlant/**.html")    public String getUrlAnt(HttpServletRequest request) {        String result = "?后面的参数为:" + request.getQueryString();        return result;    }

 

    /*     * 配置指定格式的URL,映射到对应的参数     *   请求路径:/web1/urlinfo/geturlparam/12_123.html     *          * */        @RequestMapping(value = "/geturlparam/{id}_{menuId}.html")    public ModelAndView getUrlParam(@PathVariable("id") String id,            @PathVariable("menuId") String menuId) {        ModelAndView mode = new ModelAndView(ShowMsg);        mode.addObject("msg", "获取到的Id:" + id + ",menuId:" + menuId);        return mode;    }

 

    /*     * 只接收Post 请求     */    @ResponseBody    @RequestMapping(value = "/posturl.html", method = RequestMethod.POST)    public String UrlMethod(@RequestParam String id) {        return "只能是Post请求,获取到的Id:" + id;    }

 

    /*     *   写入 cookie     * */     @RequestMapping("/writecookies.html")    public ModelAndView writeCookies(@RequestParam String value,            HttpServletResponse response) {        response.addCookie(new Cookie("key", value));        ModelAndView mode = new ModelAndView(ShowMsg);        mode.addObject("msg", "cookies 写入成功");        return  mode ;    }

 

      /*       *  通过 @CookieValue 获取对应的key的值       * */    @RequestMapping("/getcookies.html")    public ModelAndView getCookie(@CookieValue("key") String cookvalue) {        ModelAndView mode = new ModelAndView(ShowMsg);        mode.addObject("msg", "cookies=" + cookvalue);        return mode;    }

 

    /*      * 将 Servlet Api 作为参数传入      *   可以在action中直接使用  HttpServletResponse,HttpServletRequest     * */    @RequestMapping("/servlet.html")    public String Servlet1(HttpServletResponse response,            HttpServletRequest request) {        Boolean result = (request != null && response != null);        ModelAndView mode = new ModelAndView();        mode.addObject("msg", "result=" + result.toString());        return ShowMsg;    }

 

    /*     *   根据URL传入的参数实例化对象     *        *   如: http://127.0.0.1:8080/web1/urlinfo/getobject.html?UserId=1&UserName=ad     * */    @RequestMapping("getobject.html")    public ModelAndView getObject(UserInfo user) {        String result = "用户ID:" + user.getUserId().toString() + ",用户名:"                + user.getUserName().toString();        ModelAndView mode = new ModelAndView(ShowMsg);        mode.addObject("msg", "result=" + result.toString());        return mode;    }

 

 实现页面跳转:

   

    /*      * 实现页面跳转     * /web1/urlinfo/redirectpage.html     * */    @RequestMapping("/redirectpage.html")    public String RedirectPage()    {        return  "redirect:getcookies.html?r=10";                     }

 

Spring MVC 学习 之 - URL参数传递