SpringMVC數據綁定二（List、Set和Map類型）

1.List類型綁定

//聯系信息類 用戶類的子屬性
public class ContactInfo {
    private String phone;
    private String address;
    //getting and setting............
}

//用戶類
public class User {
    private String name;
    private Integer age;
    private ContactInfo contactInfo;
    
    //getting and setting............
    @Override
    public String toString() {
        return "User [name=" + name + ", age=" + age + ", contactInfo=" + contactInfo + "]";
    }
}

//List<User> 集合的包裝類
public class UserListForm {
    private List<User> users;

    public List<User> getUsers() {
        return users;
    }

    public void setUsers(List<User> users) {
        this.users = users;
    }

    @Override
    public String toString() {
        return "UserListForm [users=" + users + "]";
    }
}

//controller方法
//http://127.0.0.1:8080/SpringMVC/list?users[0].name=Tom&users[0].age=20&users[1].name=Lucy&users[1].age=25&users[1].contactInfo.phone=10086
@RequestMapping(value="list")
    @ResponseBody
    public String list(UserListForm userListForm) {
        return userListForm.toString();
    }

結果顯示：

注意：若參數中users[20] 則生成的list對應的size為21

 

2.Set

//Set<User> 集合的包裝類

public class UserSetForm {
    private Set<User> users;

    public UserSetForm() {
        //必須初始化，如若沒有則報500錯誤Cannot get element with index 0 from Set of size 0
　　 //getPropertyValue(AbstractNestablePropertyAccessor.java:661)中做判斷。拋出異常

        users = new LinkedHashSet<>();
        users.add(new User());
        users.add(new User());
    }
    
    public Set<User> getUsers() {
        return users;
    }

    public void setUsers(Set<User> users) {
        this.users = users;
    }

    @Override
    public String toString() {
        return "UserSetForm [users=" + users + "]";
    }
}

 

@RequestMapping(value="set")
    @ResponseBody
    public String set(UserSetForm userSetForm) {
        return userSetForm.toString();
    }

 

訪問方式和list一樣：但是必須在聲明的時候初始化，有幾個對象初始化幾個

3、Map

//Map<String,User> users 包裝類
public class UserMapForm {
    private Map<String,User> users;

    public Map<String, User> getUsers() {
        return users;
    }

    public void setUsers(Map<String, User> users) {
        this.users = users;
    }

    @Override
    public String toString() {
        return "UserMapForm [users=" + users + "]";
    }
}

 

//TODO:http://127.0.0.1:8080/SpringMVC/map?users["x"].name=Tom&users["x"].age=10&users["y"].name=Lucy
    @RequestMapping(value="map")
    @ResponseBody
    public String map(UserMapForm userMapForm) {
        return userMapForm.toString();
    }