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。

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@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：

 

@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 = "/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"}