Spring MVC 學習之- URL參數傳遞詳解

在學習Spring Mvc 過程中，有必要來先了解幾個關鍵參數：

@Controller：

在類上註解，則此類將編程一個控制器，在項目啟動Spring 將自動掃描此類，並進行對應URL路由映射。

 @Controllerpublic class UserAction{ }

@RequestMapping

指定URL映射路徑，如果在控制器上配置RequestMapping ，具體請求方法也配置路徑則映射的路徑為兩者路徑的疊加常用映射如:RequestMapping("url.html")

配置映射路徑：

 @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"),則映射路徑變成

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

@ResponseBody

將註解方法對應的字符串直接返回

@RequestParam

自動映射URL對應的參數到Action上面的數值，RequestParam 默認為必填參數。

@PathVariable

獲取@RequestMapping 配置指定格式的URL映射參數

/* * 直接輸出HTML，或JSON 字符串* 請求路徑: * /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 被調用"); String result = "直接返回內容- key:" + key + ",key2:" + key2; System.out.println(result); return result; }

 /* * RequestMapping 支持Ant 風格的URL配置： * 請求路徑： * /urlinfo/geturlant/config.html?key=adddd */ @ResponseBody @RequestMapping(value = "/geturlant/**.html") public String getUrlAnt(HttpServletRequest request) { String result = "?後面的參數為：" + request.getQueryString(); return result; }

 /* * 配置指定格式的URL，映射到對應的參數* 請求路徑：/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", "獲取到的Id:" + id + ",menuId:" + menuId); return mode; }

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

 /* * 寫入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 寫入成功"); return mode ; }

 /* * 通過@CookieValue 獲取對應的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; }

 /* * 將Servlet Api 作為參數傳入* 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; }

 /* * 根據URL傳入的參數實例化對象* * 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 = "用戶ID：" + user.getUserId().toString() + ",用戶名:" + user.getUserName().toString(); ModelAndView mode = new ModelAndView(ShowMsg); mode.addObject("msg", "result=" + result.toString()); return mode; }

實現頁面跳轉：

 /* * 實現頁面跳轉* /web1/urlinfo/redirectpage.html * */ @RequestMapping("/redirectpage.html") public String RedirectPage() { return "redirect:getcookies.html?r=10"; }

直接回傳JSON

請求的URL地址一定是以.json結尾，否則異常

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 ()

回傳實體：

 @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; }

回傳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; }

請求：

/web1/urlinfo/getuser.json

輸出：

 {"userId":100,"userName":"王坤"}

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持武林網。