SpringMVC通过注解获得参数的实例

Z时代
2024-01-10
分类：IT

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


<form action="pojoparam">
    姓名：<input type="text" name="name"><br>
    年龄：<input type="text" name="age"><br>
    城市：<input type="text" name="address.city"><br>
    省份：<input type="text" name="address.province"><br>
    <input type="submit" value="提交"><br>
  </form>

运行结果：