织梦网站后台怎么登陆,网上做公司网站怎么做,公司网站建设请示报告,沈阳seo整站优化1. 简介
Spring MVC可以简化从前端接收参数的步骤。
2. Param传参
通过设定函数入参和添加标记来简化接受#xff1a;
//参数接收
RequestMapping(product)
ResponseBody
//接受/product?productgoodsid123
//1.名称必须相同#xff0c;2.不传值不会不…1. 简介
Spring MVC可以简化从前端接收参数的步骤。
2. Param传参
通过设定函数入参和添加标记来简化接受
//参数接收
RequestMapping(product)
ResponseBody
//接受/product?productgoodsid123
//1.名称必须相同2.不传值不会不报错
public String product(String product, int id){System.out.println(product product , id id);return product product , id id;
}//注解指定
//pdt必须传递并转化成product不传就报400异常
//id可以不传递不传默认值就是1
RequestMapping(product1)
ResponseBody
public String product1(RequestParam(value pdt) String product, RequestParam(required false,defaultValue 1) int id){System.out.println(product product , id id);return product product , id id;
}//特殊值 ids1ids2ids3
GetMapping(product2)
ResponseBody
public String product2(RequestParam ListString ids){//RequestParam必须加System.out.println(hbs ids);return ok;}//数据直接放到数据类里要求名字必须相同
//如果没传就用默认值都不会报错
RequestMapping(product3)
ResponseBody
public String product3(Product product){System.out.println(product product);return product.toString();
}3. 动态路径传参
也可以直接从动态路径接受参数
//动态路径用{}括起来
//接收路径参数用PathVariable标记
RequestMapping({pdt}/{id})
public String login(PathVariable(pdt) String product, PathVariable String id){System.out.println(product product , id id);return product product , id id;
}4. JSON传参
从前端传来的JSON解析接收方法如下 pom.xml中导入json依赖
dependencygroupIdcom.fasterxml.jackson.core/groupIdartifactIdjackson-core/artifactIdversion2.15.0/version
/dependency配置类中加入EnableWebMvc注解
...
EnableWebMvc
public class MVCConfig {
...
}业务逻辑实现
RequestMapping(/)
Controller
ResponseBody
public class JsonController {RequestMapping(value product,method RequestMethod.POST)public String data(RequestBody Product product){//RequestBody表示接受json数据System.out.println(product product);return product.toString();}
}5.接收Cookie
通过CookieValue标注接受Cookie
RequestMapping
public String data(CookieValue(value cookieName) String cookie){System.out.println(cookie cookie);return ok;
}6.接收Header
通过RequestHeader标注接受Header:
RequestMapping
public String data(RequestHeader(Connection) String conn){//接收header的Connection字段System.out.println(conn conn);return conn conn;
}7.获取原生对象
原生对象可以直接在函数入参获取
Controller
public class dataController {Autowiredprivate ServletContext servletContext;//通过IOC自动获取ServletContext对象public void api(HttpServletResponse response, HttpServletRequest request, HttpSession session) {//获取HttpServletResponseHttpServletRequestHttpSession对象//获取ServletContext对象ServletContext servletContext1 request.getServletContext();ServletContext servletContext2 session.getServletContext();}
}
