fastjson如何判断JSONObject和JSONArray

1、fastjson如何判断JSONObject和JSONArray，百度一下，教程还真不少，但是是阿里的fastjson的我是没有找到合适的方法。这里用一个还算可以的方法，算是实现了这个效果。

网上贴代码，有时候不把引入的包贴上去，自己使用的话还真不知道是导入那个包咧。

maven依赖的如下所示：

<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.47</version>
</dependency>

 实现代码如下所示：

例子主要实现的是解析第一层，然后解析第二层，解析第二层的时候判断是否是JSONArray还是JSONObject类型的。最后我是直接输出的，你肯定是将解析出的信息进行其他操作，这里不做叙述了。

package com.fline.aic.utils;

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

public class FastJosnUtils {

    /**
     * FastJSON
     */
    public static void fastJson() {
        // 1、Json字符串,JSONObject类型的
//        String message = "{
" + "    "catalogId": "IJ1009",
"
//                + "    "tableName": "core_data.uc_gov_org",
" + "    "type": "POST",
"
//                + "    "condition": "null",
" + "    "data": {
" + "        "DataSource": "'P33'",
"
//                + "        "DataStamp": "'2018-08-25'",
" + "        "GovScCode": "'aaa'",
"
//                + "        "OperEffDate": "'2018-05-02'",
" + "        "OrgCode": "'ww'",
"
//                + "        "OrgDesc": "'ss'",
" + "        "OrgId": "1",
"
//                + "        "OrgName": "'11111'",
" + "        "OrgSeq": "11",
"
//                + "        "OrgShortName": "'ss'",
" + "        "OrgStatus": "'ss'",
"
//                + "        "OrgType": "'ss'",
" + "        "ParentOrgId": "0",
"
//                + "        "RegAddress": "'ww'",
" + "        "RegDate": "",
" + "        "RegionId": "1"
"
//                + "    }
" + "}";
        
        // 1、Json字符串,JSONArray类型的
        String message = "{
" + "    "catalogId": "IJ1009",
"
                + "    "tableName": "core_data.uc_gov_org",
" + "    "type": "POST",
"
                + "    "condition": "null",
" + "    "data": [{
" + "        "DataSource": "'P33'",
"
                + "        "DataStamp": "'2018-08-25'",
" + "        "GovScCode": "'aaa'",
"
                + "        "OperEffDate": "'2018-05-02'",
" + "        "OrgCode": "'ww'",
"
                + "        "OrgDesc": "'ss'",
" + "        "OrgId": "1",
"
                + "        "OrgName": "'11111'",
" + "        "OrgSeq": "11",
"
                + "        "OrgShortName": "'ss'",
" + "        "OrgStatus": "'ss'",
"
                + "        "OrgType": "'ss'",
" + "        "ParentOrgId": "0",
"
                + "        "RegAddress": "'ww'",
" + "        "RegDate": "",
" + "        "RegionId": "1"
"
                + "    },{
" + 
                "        "DataSource": "'P33'",
" + 
                "        "DataStamp": "'2018-08-25'",
" + 
                "        "GovScCode": "'aaa'",
" + 
                "        "OperEffDate": "'2018-05-02'",
" + 
                "        "OrgCode": "'ww'",
" + 
                "        "OrgDesc": "'ss'",
" + 
                "        "OrgId": "1",
" + 
                "        "OrgName": "'11111'",
" + 
                "        "OrgSeq": "11",
" + 
                "        "OrgShortName": "'ss'",
" + 
                "        "OrgStatus": "'ss'",
" + 
                "        "OrgType": "'ss'",
" + 
                "        "ParentOrgId": "0",
" + 
                "        "RegAddress": "'ww'",
" + 
                "        "RegDate": "",
" + 
                "        "RegionId": "1"
" + 
                "    }]
" + "}";
        // 解析第一层{},由于多种json写到了一起,所以直接引用到了包,自行开发引用自己的Json包就行。
        JSONObject jsonObject = JSONObject.parseObject(message);
        String catalogId = jsonObject.getString("catalogId");
        String schemaTableName = jsonObject.getString("tableName");
        String type = jsonObject.getString("type");
        String condition = jsonObject.getString("condition");
        System.out.println("{catalogId :" + catalogId + ", schemaTableName: " + schemaTableName + ", type: " + type
                + ", condition:" + condition + "}");

        // 解析第二层,如果根据需求可以判断是否是JSONObject还是JSONArray
        JSONArray jsonArray = new JSONArray();
        JSONObject jsonData = new JSONObject();
        String data = jsonObject.getString("data");
        //百度了很对,也没有找到合适的,我是这样判断的是否是JSONArray还是JSONObject
        if (data.contains("[") && data.contains("]")) {
            jsonArray = JSONArray.parseArray(data);
            System.out.println("jsonArray: " + jsonArray);
            //然后可以解析第二层
            for(int i=0;i< jsonArray.size();i++) {
                JSONObject jsonArrayObject = (JSONObject) jsonArray.get(i);
                String DataSource = jsonArrayObject.getString("DataSource");
                String DataStamp = jsonArrayObject.getString("DataStamp");
                String OrgName = jsonArrayObject.getString("OrgName");
                String RegAddress = jsonArrayObject.getString("RegAddress");
                //...等等字段
                System.out.println("{DataSource: "+DataSource +", DataStamp: " + DataStamp + ", OrgName: " +OrgName +", RegAddress: " + RegAddress);
            }
            
        } else {
            jsonData = JSONObject.parseObject(data);
            System.out.println("jsonData: " + jsonData);
            //然后可以解析第二层
            String DataSource = jsonData.getString("DataSource");
            String DataStamp = jsonData.getString("DataStamp");
            String OrgName = jsonData.getString("OrgName");
            String RegAddress = jsonData.getString("RegAddress");
            //...等等字段
            System.out.println("{DataSource: "+DataSource +", DataStamp: " + DataStamp + ", OrgName: " +OrgName +", RegAddress: " + RegAddress);
        }
    }

    public static void main(String[] args) {
        fastJson();
        
    }
}

 2、JSON官方的判断json字符串是JSONArray还是JSONObject类型的。是这个样子搞得，百度一下，教程还是很多的。这里也简单贴一下。

<!-- https://mvnrepository.com/artifact/org.json/json -->
<dependency>
     <groupId>org.json</groupId>
    <artifactId>json</artifactId>
    <version>20160810</version>
</dependency>

案例代码如下所示：

package com.fline.aic.utils;

import org.json.JSONArray;
import org.json.JSONObject;
import org.json.JSONTokener;

public class OrgJsonUtils {

    /**
     * 单层的orgJson判断是否是JSONObject还是JSONArray.
     */
    public static void simpleJSONObjectOrgJson() {
        String message = "[{
" + "        "DataSource": "'P33'",
"
                + "        "DataStamp": "'2018-08-25'",
" + "        "GovScCode": "'aaa'",
"
                + "        "OperEffDate": "'2018-05-02'",
" + "        "OrgCode": "'ww'",
"
                + "        "OrgDesc": "'ss'",
" + "        "OrgId": "1",
"
                + "        "OrgName": "'11111'",
" + "        "OrgSeq": "11",
"
                + "        "OrgShortName": "'ss'",
" + "        "OrgStatus": "'ss'",
"
                + "        "OrgType": "'ss'",
" + "        "ParentOrgId": "0",
"
                + "        "RegAddress": "'ww'",
" + "        "RegDate": "",
" + "        "RegionId": "1"
"
                + "    }]";
        Object json = new JSONTokener(message).nextValue();
        if (json instanceof JSONObject) {
            JSONObject jsonObject = (JSONObject) json;
            System.out.println(jsonObject);
            //自行解析即可
        } else if (json instanceof JSONArray) {
            JSONArray jsonArray = (JSONArray) json;
            System.out.println(jsonArray);
            //自行解析即可
        }
    }

    /**
     * 单层的orgJson判断是否是JSONObject还是JSONArray.
     */
    public static void simpleJSONArrayOrgJson() {
        String message = "{
" + "        "DataSource": "'P33'",
"
                + "        "DataStamp": "'2018-08-25'",
" + "        "GovScCode": "'aaa'",
"
                + "        "OperEffDate": "'2018-05-02'",
" + "        "OrgCode": "'ww'",
"
                + "        "OrgDesc": "'ss'",
" + "        "OrgId": "1",
"
                + "        "OrgName": "'11111'",
" + "        "OrgSeq": "11",
"
                + "        "OrgShortName": "'ss'",
" + "        "OrgStatus": "'ss'",
"
                + "        "OrgType": "'ss'",
" + "        "ParentOrgId": "0",
"
                + "        "RegAddress": "'ww'",
" + "        "RegDate": "",
" + "        "RegionId": "1"
"
                + "    }";
        Object json = new JSONTokener(message).nextValue();
        if (json instanceof JSONObject) {
            JSONObject jsonObject = (JSONObject) json;
            System.out.println(jsonObject);
            //自行解析即可
        } else if (json instanceof JSONArray) {
            JSONArray jsonArray = (JSONArray) json;
            System.out.println(jsonArray);
            //自行解析即可
        }
    }

    /**
     * JSON官方
     */
    public static void doubleOrgJson() {
        // Json字符串
        /*
         * String message = "{
" + "    "catalogId": "IJ1009",
" +
         * "    "tableName": "core_data.uc_gov_org",
" +
         * "    "type": "POST",
" + "    "condition": "null",
" +
         * "    "data": {
" + "        "DataSource": "'P33'",
" +
         * "        "DataStamp": "'2018-08-25'",
" +
         * "        "GovScCode": "'aaa'",
" +
         * "        "OperEffDate": "'2018-05-02'",
" +
         * "        "OrgCode": "'ww'",
" + "        "OrgDesc": "'ss'",
" +
         * "        "OrgId": "1",
" + "        "OrgName": "'11111'",
" +
         * "        "OrgSeq": "11",
" + "        "OrgShortName": "'ss'",
"
         * + "        "OrgStatus": "'ss'",
" + "        "OrgType": "'ss'",
"
         * + "        "ParentOrgId": "0",
" +
         * "        "RegAddress": "'ww'",
" + "        "RegDate": "",
" +
         * "        "RegionId": "1"
" + "    }
" + "}";
         */

        String message = "{
" + "    "catalogId": "IJ1009",
"
                + "    "tableName": "core_data.uc_gov_org",
" + "    "type": "POST",
"
                + "    "condition": "null",
" + "    "data": [{
" + "        "DataSource": "'P33'",
"
                + "        "DataStamp": "'2018-08-25'",
" + "        "GovScCode": "'aaa'",
"
                + "        "OperEffDate": "'2018-05-02'",
" + "        "OrgCode": "'ww'",
"
                + "        "OrgDesc": "'ss'",
" + "        "OrgId": "1",
"
                + "        "OrgName": "'11111'",
" + "        "OrgSeq": "11",
"
                + "        "OrgShortName": "'ss'",
" + "        "OrgStatus": "'ss'",
"
                + "        "OrgType": "'ss'",
" + "        "ParentOrgId": "0",
"
                + "        "RegAddress": "'ww'",
" + "        "RegDate": "",
" + "        "RegionId": "1"
"
                + "    }]
" + "}";
        // 解析第一层{}
        JSONObject jsonObject = new JSONObject(message);
        String catalogId = jsonObject.getString("catalogId");
        String schemaTableName = jsonObject.getString("tableName");
        String type = jsonObject.getString("type");
        String condition = jsonObject.getString("condition");
        System.out.println("{catalogId :" + catalogId + ", schemaTableName: " + schemaTableName + ", type: " + type
                + ", condition:" + condition + "}");

        // 解析第二层,如果自己已经明确第二层是[]是JSONArray类型的,如下解析即可
        JSONArray jsonArray2 = jsonObject.getJSONArray("data");
        // 解析第二层,如果自己已经明确第二层是{}是JSONObject类型的,如下解析即可
        // JSONObject jsonObject2 = jsonObject.getJSONObject("data");
        
        
        for (int i = 0; i < jsonArray2.length(); i++) {
            JSONObject jsonArrayObject = (JSONObject) jsonArray2.get(i);
            String DataSource = jsonArrayObject.getString("DataSource");
            String DataStamp = jsonArrayObject.getString("DataStamp");
            String OrgName = jsonArrayObject.getString("OrgName");
            String RegAddress = jsonArrayObject.getString("RegAddress");
            // ...等等字段
            System.out.println("{DataSource: " + DataSource + ", DataStamp: " + DataStamp + ", OrgName: " + OrgName
                    + ", RegAddress: " + RegAddress + "}");
        }
    }

    public static void main(String[] args) {
        doubleOrgJson();
        // simpleJSONObjectOrgJson();
        // simpleJSONArrayOrgJson();
    }

}

GSON和jackson，我还未接触过，这里就不叙述了，百度也有很多教程。

待续.....