SpringMVC通过注解获得参数的实例

2019-11-26 11:37:22

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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;@Controllerpublic 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：