在Spring MVC Rest中处理JSon时如何处理POJO嵌套对象

Z时代
2024-01-10
分类：问答

我试图弄清楚如何更好地处理Spring MVC中嵌套Java对象的JSon序列化/反序列化。

我的域模型如下：

  public class Cart {
        private String id;
        private Customer customerID;
        private Checkout checkoutID;
        private List<CartProduct> itemCatalogList;
        *** ... getters & setters ... ***
    }
   public class ProductCart {
        private String sku;
        private String color;
        private String sizeBase
        private int qty;
        *** ... getters & setters ... ***
    }
    public class Checkout {
        private String id;
        private String billingAddress;
        private String shippingAddress;
        private Cart cartID;
        *** ... getters & setters ... ***
    }

我在想的JSon是这样的：

{
  "cart": {
    "$oid": "51f631cb84812abb04000006"
  },
  "shippingAddress" : "5h avenue - new york",  
  "billingAddress" : "5h avenue - new york"
}

{ "customer": { "$oid": "5174da574940368a9126e8dc" }, "items_catalog": [ { "sku": "00075161", "color": "ff99cc", "size_base": "IT_25", "qty": 3, }, { "sku": "00075161", "color": "ff99cc", "size_base": "IT_27", "qty": 2, }, { "sku": "00075161", "color": "ff99cc", "size_base": "IT_29", "qty": 1, } }

假设这是一个可行的域模型和json文档，如何在Spring中从JSon开始创建结帐？

我的问题是我不知道如何在结帐和购物车json中“爆炸” $ oid来创建结帐和购物车Java Bean：

有没有办法用杰克逊自动做到这一点？

还是应该创建一种拦截器来处理例如checkout json以便检索购物车，然后执行到POJO的映射？

（-还是第三种方法？）

非常感谢您的任何建议。

回答：

如果我对您的理解正确，则可以执行以下操作（我使用的是Spring 3.2.3.RELEASE＆Jackson 1.9.12）。

在applicationContext.xml中，您具有：

<bean id="jacksonMessageConverter"
          class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/>
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list>
                <ref bean="jacksonMessageConverter"/>
            </list>
        </property>
    </bean>

您具有如下所示的Spring控制器：

package test;
import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
@RequestMapping("/json")
public class JsonParsingController {
    private final static Logger log = Logger.getLogger(JsonParsingController.class);
    @RequestMapping(value = "/cart.do", method = RequestMethod.POST, produces = "application/json; charset=utf-8")
@ResponseBody public CartResponse handleCart(@RequestBody Cart cart) {
    if (cart != null) {
        log.debug(cart);
    }
    return new CartResponse("OK!");
}
}

和三个POJO：

package test;
public class Cart {
    private String id;
    private Checkout checkoutID;
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public Checkout getCheckoutID() {
        return checkoutID;
    }
    public void setCheckoutID(Checkout checkoutID) {
        this.checkoutID = checkoutID;
    }
    @Override
    public String toString() {
        return "Cart{" +
                "id='" + id + '\'' +
                ", checkoutID=" + checkoutID +
                '}';
    }
}
package test;
public class Checkout {
    private String id;
    private String billingAddress;
    private String shippingAddress;
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getBillingAddress() {
        return billingAddress;
    }
    public void setBillingAddress(String billingAddress) {
        this.billingAddress = billingAddress;
    }
    public String getShippingAddress() {
        return shippingAddress;
    }
    public void setShippingAddress(String shippingAddress) {
        this.shippingAddress = shippingAddress;
    }
    @Override
    public String toString() {
        return "Checkout{" +
                "id='" + id + '\'' +
                ", billingAddress='" + billingAddress + '\'' +
                ", shippingAddress='" + shippingAddress + '\'' +
                '}';
    }
}
package test;
public class CartResponse {
    private String result;
    public CartResponse(String result) {
        this.result = result;
    }
    public String getResult() {
        return result;
    }
    public void setResult(String result) {
        this.result = result;
    }
}

然后，您可以在HTML页面中执行以下操作：

<script language="JavaScript" type="text/javascript">
    $(document).ready(function () {
        // Your data
        var arr = {
                    id: '51f631cb84812abb04000006',
                    checkoutID: {
                        id: '123456789',
                        "shippingAddress" : "5h avenue - new york",
                        "billingAddress" : "5h avenue - new york"
                    }
                  };
        $.ajax({
            url: '/json/cart.do',
            type: 'POST',
            data: JSON.stringify(arr),
            contentType: 'application/json; charset=utf-8',
            dataType: 'json',
            async: false,
            success: function (msg) {
                alert(msg.result);
            }
        });
    });
</script>