招聘网站可做哪些推广方案,51ppt模板网原创ppt模板,电子商务网站设计的基本流程,龙岩天宫山简介一、RequestMapping注解
RequestMapping注解#xff1a;是Spring MVC框架中的一个控制器映射注解#xff0c;用于将请求映射到相应的处理方法上#xff0c;具体来说#xff0c;他可以将指定URL的请求绑定到一个特定的方法或类上#xff0c;从而实现对请求的处理和响应。 …一、RequestMapping注解
RequestMapping注解是Spring MVC框架中的一个控制器映射注解用于将请求映射到相应的处理方法上具体来说他可以将指定URL的请求绑定到一个特定的方法或类上从而实现对请求的处理和响应。
1.RequestMapping的value属性
package com.pon;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
Controller
public class Order {RequestMapping(value {/e,/b})public String o(){return index;}
} 多个vlue属性在同一RequestMapping上可以作为同一地址·。
控制类
package com.pon;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
Controller
public class Order {RequestMapping(value {/e,/b})public String o(){return index;}
}
index.html
!DOCTYPE html
html langen
headmeta charsetUTF-8titleTitle/title
/head
body
h1你好/h1
/body
/html 1)Ant风格的value 3)value使用占位符 URL使用RESTFul风格
package com.pon;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
Controller
public class Order {RequestMapping(value {/e,/b})public String o(){return index;}RequestMapping(value /login/{username}/{password})//value的占位符public String log(PathVariable(username)String username,PathVariable(password)String password){System.out.println(用户名username密码password);return index;}
}处理器端
2.RequestMapping的method属性
超链接发送的请求方式为get请求。 在controller包下的Hello类
package com.pon.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;Controller
public class Hello {RequestMapping(/)public String first(){return first;}//请求映射只支持post请求RequestMapping(value {/ljx},method {RequestMethod.POST})public String hello(){return hi;}
}
first.xml
!DOCTYPE html
html langen xmlns:thhttp://www.thymeleaf.org
headmeta charsetUTF-8titleTitle/title
/head
body
h1首页/h1
a th:href{/ljx}Hello界面/a
/body
/html
hi.xml
!DOCTYPE html
html langen
headmeta charsetUTF-8titleTitle/title
/head
body
h1你好 MVC/h1
/body
/html RequestMapping的派生注解 验证GetMapping
在controller包下的Hello类
Controller
public class Hello {RequestMapping(/)public String first(){return first;}RequestMapping(value {/ljx},method {RequestMethod.POST})public String hello(){return hi;}GetMapping(/get)public String getMapping(){return hi;}
}
first.xml
!DOCTYPE html
html langen xmlns:thhttp://www.thymeleaf.org
headmeta charsetUTF-8titleTitle/title
/head
body
h1首页/h1
a th:href{/lix}Hello界面/a
a th:href{/get}Get界面/a
/body
/html
hi.xml
!DOCTYPE html
html langen
headmeta charsetUTF-8titleTitle/title
/head
body
h1你好 MVC/h1
/body
/html 3.RequestMapping的params属性
params在requestmapping中赋值和method在同一位置。 4.RequestMapping的headers属性
二、SpringMvc获取请求参数
1通过ServletAPI获取 testContorller类下
package com.pon.controller;
import jakarta.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
Controller
public class TestController {RequestMapping(/parama)public String test(HttpServletRequest request){String s request.getParameter(username);String r request.getParameter(password);System.out.println(names,passwordr);return test;}
}先访问首页的first.html
!DOCTYPE html
html langen xmlns:thhttp://www.thymeleaf.org
headmeta charsetUTF-8titleTitle/title
/head
body
h1首页/h1
form th:action{/format}input typesubmit value表单br
/form
a th:href{/parama(usernameadmin,password123456)}获取请求参数/a
/body
/html
test.html
!DOCTYPE html
html langen
headmeta charsetUTF-8titleTitle/title
/head
body
h1获取到请求参数/h1
/body
/html 2通过控制器方法的形参获取请求参数 testContorller类下
Controller
public class TestController {
RequestMapping(/testparam)public String testparam( String username, String password){System.out.println(usernameusernamepasswordpassword);return hi;}
}
first.html页面中调用/testparam路径
!DOCTYPE html
html langen xmlns:thhttp://www.thymeleaf.org
headmeta charsetUTF-8titleTitle/title
/head
body
h1首页/h1
form th:action{/format}input typesubmit value表单br
/form
a th:href{/parama(usernameadmin,password123456)}获取请求参数/a
a th:href{/testparam(usernameadminmm,password1234)}控制器方法获取请求参数/a
/body
/html
hi.html
!DOCTYPE html
html langen
headmeta charsetUTF-8titleTitle/title
/head
body
h1你好 MVC/h1
/body
/html 3RequestParam 当HTML中的属性名与获取请求参数中的名字不一样需要使用RequestParam。
例如
在控制器类中
Controller
public class TestController {
RequestMapping(/testparam)public String testparam( String username, String password){System.out.println(username:username,password:password);return hi;}
}
首页first.html界面
a th:href{/testparam(usernadminmm,password1234)}控制器方法获取请求参数/abr
、
当参数不一样时页面可以正常访问但控制台获取不到参数。
解决方案在控制类的构造函数上添加RequestParam注解其他参数不变。
Controller
public class TestController {
RequestMapping(/testparam)public String testparam(RequestParam(usern)String username, String password){System.out.println(username:username,password:password);return hi;}
} 4RequsetHeader
请求头信息其实就是:localhost:8080 5CookieValue 6通过实体类形参获取请求参数
在首页first.html中定义一个表单
!DOCTYPE html
html langen xmlns:thhttp://www.thymeleaf.org
headmeta charsetUTF-8titleTitle/title
/head
body
h1首页/h1
form th:action{/pojo} methodpost用户名input typetext nameusernamebr密码 input typepassword namepasswordbr性别input typeradio namesex value男男input typeradio namesex value女女br年龄:input typetext nameagebrinput typesubmit value实体类请求参数
/form
/body
/html
根据表单的属性创建一个实体类对象User:
package com.pon.pojo;
public class User {private String username;private String password;private String sex;private Integer age;public User() {}public User(String username, String password, String sex, Integer age) {this.username username;this.password password;this.sex sex;this.age age;}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;}public String getSex() {return sex;}public void setSex(String sex) {this.sex sex;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age age;}Overridepublic String toString() {return User{ username username \ , password password \ , sex sex \ , age age };}
}在控制类中写访问页面的路径
Controller
public class TestController {RequestMapping(/pojo)public String Pojo(User user){System.out.println(user);return hi;}
}hi.xml
!DOCTYPE html
html langen
headmeta charsetUTF-8titleTitle/title
/head
body
h1success/h1
/body
/html
