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。

@Controller

public 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：

 

@Controller

public 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 = "/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 = "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"; 

                

    }

 

直接回传JSON

    请求的URL地址一定是以.json结尾，否则异常

     Failed to load resource: the server responded with a status of 406 (Not Acceptable) ： The resource identified by this request is only capable of generating responses with characteristics not acceptable according to the request "accept" headers () 

回传实体：

@JsonSerialize(include = JsonSerialize.Inclusion.NON_NULL)

public class UserInfo {



      private  Integer UserId;

      public Integer getUserId() {

        return UserId;

    }

    public void setUserId(Integer userId) {

        UserId = userId;

    }

    public String getUserName() {

        return UserName;

    }

    public void setUserName(String userName) {

        UserName = userName;

    }

    private String UserName;

      

     

}

 回传 action

@ResponseBody

    @RequestMapping("/getuser.json")

    public UserInfo  GetUser()

    {

        System.out.println("getuser");

        UserInfo model=new  UserInfo();

        model.setUserId(100);

        model.setUserName("王坤");

        return model;

    }

请求：

/web1/urlinfo/getuser.json

输出：

{"userId":100,"userName":"王坤"}