在Spring MVC Rest中处理JSon时如何处理POJO嵌套对象

本文介绍了在Spring MVC Rest中处理JSon时如何处理POJO嵌套对象的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！问题描述

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:

结帐:

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

购物车:

{ "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, } }

假设这是可行的域模型& json文档，在春季如何从JSon开始创建结帐?

我的问题是我不知道如何在结帐& cart json，以便创建结帐&购物车Java Bean:

有没有办法用Jackson来自动完成?
还是我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?

(-还是第三种方式?)

非常感谢您提供任何建议.

解决方案

如果我对您的理解正确，那么您可以执行以下操作(我使用的是Spring 3.2.3.3.RELEASE& Jackson 1.9.12).

在您的applicationContext.xml中，您具有:

您有一个看起来像这样的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:

至少对我来说-它有效:)

I'm trying to figure out how to better deal with JSon serialization/deserialization of nested Java objects in Spring MVC.

My domain model is the following:

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 ... *** }

The JSon I was thinking is something like this:

checkout:

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

cart:

{ "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, } }

Assuming this is a viable domain model & json document, how in Spring I could create a checkout starting from a JSon?

My problem is that I don't know how to "explode" the $oid in the checkout & cart json in order to create checkout & cart Java Beans:

is there a way to do it automatically with Jackson?
or should I create a sort of Interceptor to handle a, for example, checkout json in order to retrieve the cart and then perform the mapping to the POJO?

(- or there is a 3rd way?)

Thanks a lot for any advice.

解决方案

If I understood you correctly, you could do something like this (I'm using Spring 3.2.3.RELEASE & Jackson 1.9.12).

In your applicationContext.xml you have:

You have Spring controller which looks like this:

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!"); } }

and three POJOs:

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; } }

Then in your HTML page you can do something like this:

At least as for me - it works :)

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在Spring MVC Rest中处理JSon时如何处理POJO嵌套对象