SpringMVC中的参数怎么利用注解获取?很多新手对此不是很清楚,为了帮助大家解决这个难题,下面小编将为大家详细讲解,有这方面需求的人可以来学习下,希望你能有所收获。
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SpringMVC可以通过RequestParam注解来映射获得参数,具体用法如下:
例子:
配置过程省略
1.新建controller类
package com.loger.controller; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; @Controller public class RequestParam { public static final String SUCCESS = "success"; @RequestMapping(value="/requestparam") public String requestParam(@org.springframework.web.bind.annotation. RequestParam(value="username") String un, @org.springframework.web.bind.annotation.RequestParam(value="age") Integer age){ System.out.println(un + " " + age); return SUCCESS; } }
2.index.jsp
运行结果:
补充:如果表单名跟方法的参数名一致的话,无需再用@RequestParam注解来映射。
如改为
@RequestMapping(value="/requestparam")
public String requestParam(String username,Integer age)即可!
用类作为参数,且包含级联属性的参数获取方法:
1.新建Adress类
package com.loger.bean; public class Address { private String province; private String city; public String getProvince() { return province; } public void setProvince(String province) { this.province = province; } public String getCity() { return city; } public void setCity(String city) { this.city = city; } @Override public String toString() { return "Address [province=" + province + ", city=" + city + "]"; } }
2.新建User类
package com.loger.bean; public class User { private String name; private int age; private Address address; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public Address getAddress() { return address; } public void setAddress(Address address) { this.address = address; } @Override public String toString() { return "User [name=" + name + ", age=" + age + ", address=" + address + "]"; } }
3.controller
4.表单
User有级联属性Address,表单传入的参数是address.city address.province
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