SpringMVC - 資料綁定（Xml、@InitBinder、Set、嵌套對象、多個對象）（二）

Entity類： 

package com.imooc.object;

import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;


@XmlRootElement(name="admin")
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;
    }

    @XmlElement(name="age")
    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

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

package com.imooc.object;

import java.util.HashSet;
import java.util.Objects;
import java.util.Set;

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;
    }

    public static void main(String[] args) {
        Set<User> u = new HashSet<User>();
        User u1 = new User();
        u1.setName("aa");
        User u2 = new User();
        u2.setName("aa");
        u.add(u1);
        u.add(u2);
        System.out.println("size:"+u.size());
        System.out.println(u);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || 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 +
//                '}'+this.hashCode();
//    }

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

package com.imooc.object;

public class ContactInfo {
    private String phone;
    private String address;

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "ContactInfo{" +
                "phone='" + phone + '\'' +
                ", address='" + address + '\'' +
                '}';
    }
}      

package com.imooc.object;

import java.util.LinkedHashSet;
import java.util.Set;

public class UserSetForm {
    private Set<User> users;

    private UserSetForm(){
        users = new LinkedHashSet<User>();
        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 +
                '}';
    }
}      

package com.imooc.object;

import java.util.List;

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 +
                '}';
    }
}      

package com.imooc.object;

import java.util.Map;

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

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

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

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

package com.imooc.controller;

import com.imooc.object.*;
import org.springframework.beans.propertyeditors.CustomDateEditor;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.*;
import javax.servlet.http.HttpServletRequest;
import java.text.SimpleDateFormat;
import java.util.Date;

@Controller
public class TestController {

    //todo     http://localhost:8080/baseType.do?age=10
    //todo 500 http://localhost:8080/baseType.do
    //todo 400 http://localhost:8080/baseType.do?age=abc
    @RequestMapping(value = "baseType.do")
    @ResponseBody
    public String baseType(int age){
        return "age:"+age;
    }

    //todo     http://localhost:8080/baseType2.do?age=10
    //todo     http://localhost:8080/baseType2.do
    //todo 400 http://localhost:8080/baseType2.do?age=abc
    @RequestMapping(value = "baseType2.do")
    @ResponseBody
    public String baseType2(Integer age){
        return "age:"+age;
    }

    //todo http://localhost:8080/array.do?name=Tom&name=Lucy&name=Jim
    @RequestMapping(value = "array.do")
    @ResponseBody
    public String array(String[] name){
        StringBuilder sbf = new StringBuilder();
        for(String item : name){
            sbf.append(item).append(" ");
        }
        return sbf.toString();
    }

    //todo http://localhost:8080/object.do?name=Tom&age=10
    //TODO http://localhost:8080/object.do?name=Tom&age=10&contactInfo.phone=10086
    //TODO http://localhost:8080/object.do?user.name=Tom&admin.name=Lucy&age=10
    @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.");
    }

    //TODO http://localhost:8080/list.do?users[0].name=Tom&users[1].name=Lucy
    //TODO http://localhost:8080/list.do?users[0].name=Tom&users[1].name=Lucy&users[20].name=Jim
    @RequestMapping(value = "list.do")
    @ResponseBody
    public String list(UserListForm userListForm){
        return "listSize:"+userListForm.getUsers().size() + "  " + userListForm.toString();
    }

    //TODO http://localhost:8080/set.do?users[0].name=Tom&users[20].name=Lucy
    @RequestMapping(value = "set.do")
    @ResponseBody
    public String set(UserSetForm userSetForm){
        return userSetForm.toString();
    }

    //TODO http://localhost:8080/map.do?users['X'].name=Tom&users['X'].age=10&users['Y'].name=Lucy
    @RequestMapping(value = "map.do")
    @ResponseBody
    public String map(UserMapForm userMapForm){
        return userMapForm.toString();
    }

//    {
//        "name": "Jim",
//            "age": 16,
//            "contactInfo": {
//                "address": "beijing",
//                "phone": "10010"
//              }
//    }
    //application/json
    @RequestMapping(value = "json.do")
    @ResponseBody
    public String json(@RequestBody User user){
        return user.toString();
    }

//    <?xml version="1.0" encoding="UTF-8" ?>
//    <admin>
//      <name>Jim</name>
//      <age>16</age>
//    </admin>
    //application/xml
    @RequestMapping(value = "xml.do")
    @ResponseBody
    public String xml(@RequestBody Admin admin){
        return admin.toString();
    }      

1. 如果沒有@InitBinder注解的輔助方法，根據之前所學的理論，這個方法如果傳遞user.name，admin.name結果會怎麼樣呢？

   答：user和admin的name屬性都為null。

2. Set集合報錯表面取決于提前添加了對應個數的對象，但是底層取決于hashCode方法的判斷依據。是以一般情況不建議使用Set來做集合，用List。
3. 待更新...