springmvc 数据绑定

  • 基本类型

@ResponseBody
@RequestMapping(value = "/baseType")
public String bastType(@RequestParam(value = "age",required = false,defaultValue = "1") Integer age){
    return "age:"+age;
}

请求: /baseType?age=2
结果: age:20

  • 数组

@ResponseBody
@RequestMapping(value = "/array")
public String array(String[] name){
    StringBuilder sb = new StringBuilder();

    for (String str : name) {
        sb.append(str).append(",");
    }
    sb.deleteCharAt(sb.length()-1);
    return sb.toString();
}

请求: /array?name=tom&name=jack&name=jim
结果: tom,jack,jim

  • 对象

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

    // getter and setter...

    @Override
    public String toString() {
        return "User{" +
            "name='" + name + '\'' +
            ", age=" + age +
            '}';
    }
}
@ResponseBody
@RequestMapping(value = "/object")
public String object(User user) {

    return user.toString();
}

请求: /object?name=jack&age=10
结果: User{name='jack', age=20}

  • 对象.对象

public class User {
    private String name;
    private Integer age;
    private ContactInfo contactInfo;

    // getter and setter...

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", contactInfo=" + contactInfo +
                '}';
    }
}
@ResponseBody
@RequestMapping(value = "/object2")
public String object2(User user) {
    return user.toString();
}

请求: /object2?name=jack&age=20&contactInfo.phone=123456&contactInfo.address=xxxxx
结果: User{name='jack', age=20, contactInfo=ContactInfo{phone='123456', address='xxxxx'}}

  • 同属性多对象

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

    // getter and setter...

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

    // getter and setter

    @Override
    public String toString() {
        return "User{" +
            "name='" + name + '\'' +
            ", age=" + age +
            '}';
    }
}
@ResponseBody
@RequestMapping(value = "/object3")
public String object2(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.");
}

请求: /object3?user.name=jack&age=20&admin.name=tom
结果: User{name='jack', age=20}Admin{name='tim', age=20}

  • list

import java.util.List;
public class UserListForm {
    private List users ;

    // getter and setter...

    @Override
    public String toString() {
        return "UserListForm{" +
            "users=" + users +
            '}';
    }
}
@ResponseBody
@RequestMapping(value = "/list")
public String list(UserListForm userListForm) {
    return userListForm.toString();
}

请求: /list?users[0].name=111&users[0].age=1&users[1].name=222&users[1].age=2
结果: UserListForm{users=[User{name='111', age=1, contactInfo=null}, User{name='222', age=2, contactInfo=null}]}
说明: users[index] 中index的索引不要跳跃 如果这样写/list?users[0].name=111&users[0].age=1&users[3].name=222&users[3].age=2
结果会是这样的:UserListForm{users=[User{name='111', age=1, contactInfo=null}, User{name='null', age=null, contactInfo=null}, User{name='null', age=null, contactInfo=null}, User{name='222', age=2, contactInfo=null}]}
其他方法: 也可以在前端把数据组装成json字符串,然后传入,再用工具转化为对象

  • set

import java.util.LinkedHashSet;
import java.util.Set;
public class UserSetForm {
    //set需要事先初始化一下才行,而且要先设置好里面的对象,也不能索引越界
    private Set users;

    public UserSetForm(){
        users = new LinkedHashSet<>();

        users.add(new User());
        users.add(new User());
    }

    // getter and setter...

    @Override
    public String toString() {
        return "UserSetForm{" +
            "users=" + users +
            '}';
    }
}
@ResponseBody
@RequestMapping(value = "/set")
public String set(UserSetForm userSetForm) {
    return userSetForm.toString();
}

请求: /set?users[0].name=111&users[0].age=1&users[1].name=222&users[1].age=2
结果: UserSetForm{users=[User{name='111', age=1, contactInfo=null}, User{name='222', age=2, contactInfo=null}]}
说明: set需要事先初始化一下才行,而且要先设置好里面的对象,也不能索引越界 set用来去重,需要重写hashCode()equals()方法

  • map

public class UserMapForm {
    private Map users;

    //getter and setter

    @Override
    public String toString() {
        return "UserMapForm{" +
                "users=" + users +
                '}';
    }
}
@ResponseBody
@RequestMapping(value = "/map")
public String map(UserMapForm userMapForm) {
    return userMapForm.toString();
}

请求: /map?user[x].name=tom&user[x].age=20&user[y].name=jack&user[y].age=22
结果: UserMapForm{users={x=User{name='tom', age=20, contactInfo=null}, y=User{name='jack', age=22, contactInfo=null}}}

  • json

/**
 * 需要的jar包
    
         org.codehaus.jackson
         jackson-mapper-asl
         1.9.13
     

    request-header   Content-Type:application/json

    data:  
     {
         "name":"aaaa",
         "age":20
     }
 * @param user
 * @return
 */
 @ResponseBody
@RequestMapping(value = "/json")
public String json(@RequestBody User user) {

    return user.toString();
}

请求: localhost:8085/json
结果: User{name='aaaa', age=20, contactInfo=null}

  • xml

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="age")
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
    @XmlElement(name="name")
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @Override
    public String toString() {
        return "Admin{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}
/**
 * 所需jar包
     
         org.springframework
         spring-oxm
         4.3.6.RELEASE
     

 request header   Content-Type:application/xml
 data:
     
         aaa
         20
     
 * @param admin
 * @return
 */
@ResponseBody
@RequestMapping(value = "/xml")
public String xml(@RequestBody Admin admin) {

    return admin.toString();
}

请求: localhost:8085/xml
结果: Admin{name='aaa', age=20}

你可能感兴趣的:(springmvc 数据绑定)