1、通过的ServletAPI获取
只需要在控制器的方法的形参位置设置HTTPRequest request 类型的形参就i可以在控制器方法种使用request对象获取请求参数
@RequestMapping("/servletAPI")public String getByServletAPI(HttpServletRequest request){HttpSession session = request.getSession();String username = request.getParameter("username");String password = request.getParameter("password");System.out.println("username = " + username + "," + "password = " + password);return "success";
2、通过控制器方法的形参获取请求参数
前端页面
<form th:action="@{/param}" method="post">用户名：<input type="text" name="username"><br>密码：<input type="password" name="password"><br><input type="submit" value="登录">
</form>@RequestMapping("/param")
public String getParam(String username,String password){ System.out.println("username:"+username+",password:"+password);return "success";
}* 只需要在控制器方法的形参位置，设置一个形参，形参的名字和请求参数的名字一致即可
3、通过@RequestParam获取请求参数
@RequestParam是将请求参数和控制器方法的形参创建映射关系
| http://localhost:8080/springmvc_rest/param?password=123 |
@RequestMapping("/param")
public String getParam(@RequestParam(value = "username",required = true, defaultValue = "hello")String username, String password){System.out.println("username:" + username + ",password:" + password);return "success";
}
@RequestParam注解的属性：
value：设置和形参绑定的请求参数的名字
required:设置是否必须传输value所对应的请求参数
- 默认值为true，表示value所对应的请求参数必须传输否则页面报错 Required String parameter 'xxx' is not present
- 若设置为false，则表示value所对应的请求参数不是必须传输，如果此时获取该参数的值，则为nul
defaultValue：设置当没有传输value所对应的请求参数时，为形参设置的默认值，此时和required属性值无关
4、通过@RequestHeaher获取请求参数
@RequestParam是将请求头信息和控制器方法的形参创建映射关系
@RequestMapping("/param")public String getParam(String username, String password,@RequestHeader("referer") String referer){System.out.println("username = " + username + "," + "password = " + password);System.out.println("referer = " + referer);return "success";}5、通过@CookieValue获取请求参数
@CookieValue是将cookie数据和控制器方法的形参创建映射关系
@RequestMapping("/param")public String getParam(String username, String password,@CookieValue("JSESSIONID") String jsessionId){System.out.println("username = " + username + "," + "password = " + password);System.out.println("jsessionId = " + jsessionId);return "success";}
返回结果
6、通过pojo获取请求参数
先创建实体类
package com.pojo;
public class User {private Integer id;private String username;private String password;public User() { }public User(Integer id, String username, String password) {this.id = id;this.username = username;this.password = password;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}@Overridepublic String toString() {return "User{" +"id=" + id + ", username='" + username + '\'' +", password='" + password + '\'' +'}';}
}前端页面
<form th:action="@{/param/pojo}" method="post">用户名：<input type="text" name="username"><br>密码：<input type="password" name="password"><br><input type="submit" value="登录">
</form>控制器
@RequestMapping("/param/pojo")
public String getParamByPojo(User user){System.out.println(user);return "success";
}
