Spring MVC 学习 之 - URL参数传递详解

本篇文章主要介绍了SpringMVC-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，有兴趣的可以了解一下。

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"}