SpringMvc获取请求参数

本是古典何须时尚 2023-07-03 12:13 2阅读 0赞

1.  @RequestMapping：获取请求参数
2.  @RequestHeader：获取请求头信息某个key的值
3.  @CookieValue：获取指定cookid中值

**@RequestMapping 的使用：**  
@RequestParam(value = “name”) String name 该代码等价于原生servlet中：name =request.getParameter（“name”）

@RequestMapping的四个参数

*  value：指定获取url地址上key的值
 *  name：指定获取url地址上key的值
 *  required：这个参数是否必须（默认为true）
 *  defaultValue：默认值，没声明时默认null  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0ODkyMDkx_size_16_color_FFFFFF_t_70]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0ODkyMDkx_size_16_color_FFFFFF_t_70 1]

**@RequestHeader的使用**  
@RequestHeader (value = “User-Agent”) ，等价于原生servlet获取请求头信息 request.getHeader(“User-Agent”)

@RequestHeader的四个参数

*  value：获取指定的请求头信息
 *  name：获取指定的请求头信息
 *  required：这个参数是否必须（默认为true）
 *  defaultValue：默认值，没声明时默认null  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0ODkyMDkx_size_16_color_FFFFFF_t_70 2]  
    ![在这里插入图片描述][20200206160826445.png]  
    查看游览器User-Agent请求头信息

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0ODkyMDkx_size_16_color_FFFFFF_t_70 3]  
**@CookieValue的使用**  
@CookieValue(value = “JSESSIONID”），等价于原生servlet获取cookie中信息

Cookie [ ] cookies =request.getCookies();
    for(Cookie c:cookies ){
    	if(c.getName .equals("JSESSIONID")){
    		String cv = c.getValue();
    	}
    }

@CookieValue的四个参数

*  value：获取指定的cookid中的值
 *  name：获取指定的cookid中的值
 *  required：这个参数是否必须（默认为true）
 *  defaultValue：默认值，没声明时默认null![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0ODkyMDkx_size_16_color_FFFFFF_t_70 4]
 *  ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0ODkyMDkx_size_16_color_FFFFFF_t_70 5]  
    **SpringMvc自动封装pojo属性**  
    Address 类

package com.stone.mvc.model;
    
    public class Address
    {
        private String province; // 省
        private String town;    //  市
        private String district;  //  街道
    
        public Address()
        {
        }
    
        public Address(String province, String town, String district)
        {
            this.province = province;
            this.town = town;
            this.district = district;
        }
    
        @Override
        public String toString()
        {
            return "Address{" +
                    "province='" + province + '\'' +
                    ", town='" + town + '\'' +
                    ", district='" + district + '\'' +
                    '}';
        }
    
        public String getProvince()
        {
            return province;
        }
    
        public void setProvince(String province)
        {
            this.province = province;
        }
    
        public String getTown()
        {
            return town;
        }
    
        public void setTown(String town)
        {
            this.town = town;
        }
    
        public String getDistrict()
        {
            return district;
        }
    
        public void setDistrict(String district)
        {
            this.district = district;
        }
    }

User类

package com.stone.mvc.model;
    
    
    
    
    public class User
    {
        private String name; // 用户姓名
        private Integer age; // 用户年龄
        private String sex; //  用户性别
        private Address address;    //用户地址
    
    
        public User(String name, Integer age, String sex, Address address)
        {
            this.name = name;
            this.age = age;
            this.sex = sex;
            this.address = address;
        }
    
        @Override
        public String toString()
        {
            return "User{" +
                    "name='" + name + '\'' +
                    ", age=" + age +
                    ", sex='" + sex + '\'' +
                    ", address=" + address +
                    '}';
        }
    
        public User()
        {
        }
    
        public String getName()
        {
            return name;
        }
    
        public void setName(String name)
        {
            this.name = name;
        }
    
        public Integer getAge()
        {
            return age;
        }
    
        public void setAge(Integer age)
        {
            this.age = age;
        }
    
        public String getSex()
        {
            return sex;
        }
    
        public void setSex(String sex)
        {
            this.sex = sex;
        }
    
        public Address getAddress()
        {
            return address;
        }
    
        public void setAddress(Address address)
        {
            this.address = address;
        }
    }

RequestController 控制器

@Controller
    public class RequestController
    {
        
        @RequestMapping("request4")
        public String request4(User user){
            System.out.println("user = " + user);
    
            return "success";
        }
    
    }

页面数据  
![在这里插入图片描述][20200206210356873.png]  
运行结果  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0ODkyMDkx_size_16_color_FFFFFF_t_70 6]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0ODkyMDkx_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200206155055787.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0ODkyMDkx,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0ODkyMDkx_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20200206155022358.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0ODkyMDkx,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0ODkyMDkx_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20200206160652756.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0ODkyMDkx,size_16,color_FFFFFF,t_70
[20200206160826445.png]: https://img-blog.csdnimg.cn/20200206160826445.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0ODkyMDkx_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20200206160932126.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0ODkyMDkx,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0ODkyMDkx_size_16_color_FFFFFF_t_70 4]: https://img-blog.csdnimg.cn/20200206162340108.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0ODkyMDkx,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0ODkyMDkx_size_16_color_FFFFFF_t_70 5]: https://img-blog.csdnimg.cn/20200206162633616.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0ODkyMDkx,size_16,color_FFFFFF,t_70
[20200206210356873.png]: https://img-blog.csdnimg.cn/20200206210356873.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0ODkyMDkx_size_16_color_FFFFFF_t_70 6]: https://img-blog.csdnimg.cn/20200206211220558.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ0ODkyMDkx,size_16,color_FFFFFF,t_70