@InitBinder注解

User类

public class User {

    private String name;
    private Integer age;
    private ContactInfo contactInfo;

    public ContactInfo getContactInfo() {
        return contactInfo;
    }

    public void setContactInfo(ContactInfo contactInfo) {
        this.contactInfo = contactInfo;
    }

    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;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) 
            return true;
        if (o == null || this.getClass() != o.getClass()) 
            return false;
        User user = (User) o;
        return Objects.equals(name, user.name) &&
                Objects.equals(age, user.age);
    }

    @Override
    public int hashCode() {
        return Objects.hash(name, age);
    }

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", contactInfo=" + contactInfo +
                '}';
    }
}

Admin类

public class Admin {
    private String name;
    private Integer age;

    @XmlElement(name="name")
    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;
    }

    @Override
    public String toString() {
        return "Admin{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

Test测试类

 @RequestMapping(value = "object.do")
    @ResponseBody
    public String object(User user,Admin admin){
        return user.toString()+" "+admin.toString();
    }

    @InitBinder("user")
    public void initUser(WebDataBinder binder){
        binder.setFieldDefaultPrefix("user.");
    }

    @InitBinder("admin")
    public void initAdmin(WebDataBinder binder){
        binder.setFieldDefaultPrefix("admin.");
    }

访问地址:http://localhost:8080/object.do?user.name=Tom&admin.name=Lucy&age=10