将深层嵌套的json转换为java对象，反之亦然 [英] Converting deeply nested json to java object and vice versa

问题描述

我正在使用JAXB将我的json转换为java对象。我面临的问题是它导致我创建了大量的类，除了充当json标签的占位符之外没有任何用处。

I am using JAXB for my json conversion to java object. The problem I am facing is that it leads me to create huge number of classes which serves no purpose except acting as a place holder for json tags.

例如：考虑以下json：

For example: Consider below json:

{
"proposalAggregation": {
    "Buys": {
        "Heading1": {
            "key1": "value1",
            "key2": "value2",
            "key3": "value3"
        },
        "Heading2": {
            "key1": "value1",
            "key2": "value2",
            "key3": "value3"
        }
    },
    "Sells": {
        "Heading1": {
            "key1": "value1",
            "key2": "value2",
            "key3": "value3"
        },
        "Heading2": {
            "key1": "value1",
            "key2": "value2",
            "key3": "value3"
        }
    },
    "TAChanges": {
        "Heading1": {
            "key1": "value1",
            "key2": "value2",
            "key3": "value3"
        },
        "Heading2": {
            "key1": "value1",
            "key2": "value2",
            "key3": "value3"
        }
    },
    "Existing": {
        "Heading1": {
            "key1": "value1",
            "key2": "value2",
            "key3": "value3"
        },
        "Heading2": {
            "key1": "value1",
            "key2": "value2",
            "key3": "value3"
        }
    },
    "Proposed": {
        "Heading1": {
            "key1": "value1",
            "key2": "value2",
            "key3": "value3"
        },
        "Heading2": {
            "key1": "value1",
            "key2": "value2",
            "key3": "value3"
        }
    },
    "PIAChanges": {
        "Heading1": {
            "key1": "value1",
            "key2": "value2",
            "key3": "value3"
        },
        "Heading2": {
            "key1": "value1",
            "key2": "value2",
            "key3": "value3"
        }
    }
}

}

现在要将此JSON反序列化为java对象，这些是我需要创建的java类： / p>

Now to deserialize this JSON as-is to java object these are the java classes i need to create:

Class ProposalAggregation --> this contains Buys, sells, existing, porposed,TAChanges, PIA

Class Buys extends Calculation
Class Sells extends Calculation
Class Existing extends Calculation
Class proposed extends Calculation
Class TAChanges extends Calculation
Class PIAChanges extends Calculation 
Class Calculation -- > this contains heading1 and heading2

class Heading1
Class Heading2

因此总共有9个类可以模仿JSON以上，如果我们看一下这些类的作用，它们只不过是JSON标记的占位符。
有没有简单的方法？

So in total 9 classes to mimic above JSON and if we looks at the role of these classes they are nothing but place holders for JSON tags. Is there any easy way for this ?

推荐答案

您可以通过以下方式实施Google的GSON库。已经显示了样本类，您可以进一步修改它。

You can implement Google's GSON library in following manner. Have shown with a sample class, you can modify it further.

类 - ProposalAggregation

package com.test;

import java.util.Map;

public class ProposalAggregation {

private Map<String, Map<String, String>> Buys;
private Map<String, Map<String, String>> Sells;
private Map<String, Map<String, String>> TAChanges;

public Map<String, Map<String, String>> getBuys() {
    return Buys;
}

public void setBuys(Map<String, Map<String, String>> buys) {
    Buys = buys;
}

public Map<String, Map<String, String>> getSells() {
    return Sells;
}

public void setSells(Map<String, Map<String, String>> sells) {
    Sells = sells;
}

public Map<String, Map<String, String>> getTAChanges() {
    return TAChanges;
}

public void setTAChanges(Map<String, Map<String, String>> tAChanges) {
    TAChanges = tAChanges;
}

public String toString() {
    return "BUYS=" + this.Buys + " \nSELLS=" + this.Sells + " \nTACHANGES="
            + this.TAChanges;
}

}

测试主类
请注意，我修改了 key 名称只是为了验证转换是否正确。

Test main class Note that I have modified key names just to verify the conversion is correct.

package com.test;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

import com.google.gson.Gson;

public class TestClass {

    public static void main(String[] args) {
        Gson gson = new Gson();

        try {

            String jsonString = " { 'Buys': { 'bHeading1': { 'bkey1': 'value1', 'bkey2': 'value2', 'bkey3': 'value3' }, 'bbHeading2': { 'bbkey1': 'value1', 'bbkey2': 'value2', 'bbkey3': 'value3' } }, "
                    + "'Sells': { 'sHeading1': { 'skey1': 'value1', 'skey2': 'value2', 'skey3': 'value3' }, 'ssHeading2': { 'sskey1': 'value1', 'sskey2': 'value2', 'sskey3': 'value3' } }, "
                    + "'TAChanges': { 'Heading1': { 'key1': 'value1', 'key2': 'value2', 'key3': 'value3' }, 'Heading2': { 'key1': 'value1', 'key2': 'value2', 'key3': 'value3' } }, 'Existing': { 'Heading1': { 'key1': 'value1', 'key2': 'value2', 'key3': 'value3' }, 'Heading2': { 'key1': 'value1', 'key2': 'value2', 'key3': 'value3' } }, 'Proposed': { 'Heading1': { 'key1': 'value1', 'key2': 'value2', 'key3': 'value3' }, 'Heading2': { 'key1': 'value1', 'key2': 'value2', 'key3': 'value3' } }, 'PIAChanges': { 'Heading1': { 'key1': 'value1', 'key2': 'value2', 'key3': 'value3' }, 'Heading2': { 'key1': 'value1', 'key2': 'value2', 'key3': 'value3' } } }";


            // convert to java class
            ProposalAggregation obj = gson.fromJson(jsonString, ProposalAggregation.class);
            System.out.println("OBJECT : " + obj);

            // convert to json
            String jsonStringFromObj = gson.toJson(obj);
            System.out.println("JSON : " + jsonStringFromObj);

        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}

这是输出。

OBJECT : BUYS={bHeading1={bkey1=value1, bkey2=value2, bkey3=value3}, bbHeading2={bbkey1=value1, bbkey2=value2, bbkey3=value3}} 
SELLS={sHeading1={skey1=value1, skey2=value2, skey3=value3}, ssHeading2={sskey1=value1, sskey2=value2, sskey3=value3}} 
TACHANGES={Heading1={key1=value1, key2=value2, key3=value3}, Heading2={key1=value1, key2=value2, key3=value3}}
JSON : {"Buys":{"bHeading1":{"bkey1":"value1","bkey2":"value2","bkey3":"value3"},"bbHeading2":{"bbkey1":"value1","bbkey2":"value2","bbkey3":"value3"}},"Sells":{"sHeading1":{"skey1":"value1","skey2":"value2","skey3":"value3"},"ssHeading2":{"sskey1":"value1","sskey2":"value2","sskey3":"value3"}},"TAChanges":{"Heading1":{"key1":"value1","key2":"value2","key3":"value3"},"Heading2":{"key1":"value1","key2":"value2","key3":"value3"}}}

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