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使用Java解析JSON数据并提取特定字段：以提取`mailNo`为例

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用户8589624
发布于 2025-11-15 13:39:03
发布于 2025-11-15 13:39:03
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文章被收录于专栏：nginxnginx

使用Java解析JSON数据并提取特定字段：以提取mailNo为例

在现代软件开发中，处理JSON数据是一项非常常见的任务。无论是从API接口获取数据，还是将数据存储为JSON格式，解析和提取JSON中的特定字段都是开发人员需要掌握的基本技能。本文将以一个实际案例为例，详细介绍如何使用Java解析JSON数据并提取其中的mailNo字段。

1. 背景介绍

1.1 JSON简介

JSON（JavaScript Object Notation）是一种轻量级的数据交换格式，易于人阅读和编写，同时也易于机器解析和生成。它基于JavaScript的一个子集，但独立于语言，几乎所有的编程语言都支持JSON格式的数据处理。

1.2 实际案例

假设我们有一个JSON数据，其中包含多个订单信息，每个订单都有一个唯一的mailNo字段。我们的目标是从这个JSON数据中提取出所有的mailNo字段，并将其存储在一个列表中。

2. 准备工作

2.1 环境搭建

为了解析JSON数据，我们需要使用一个Java库。在本文中，我们将使用Jackson库，这是一个非常流行的JSON处理库，功能强大且易于使用。

2.1.1 添加依赖

如果你使用Maven构建项目，可以在pom.xml中添加以下依赖：

代码语言：javascript
复制
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.13.3</version>
</dependency>

如果你使用Gradle构建项目，可以在build.gradle中添加以下依赖：

代码语言：javascript
复制
implementation 'com.fasterxml.jackson.core:jackson-databind:2.13.3'
2.2 JSON数据结构

以下是我们将要处理的JSON数据的示例：

代码语言：javascript
复制
{
  "msg": "操作成功!",
  "code": "ok",
  "result": {
    "records": [
      {
        "merchantId": 0,
        "organId": 0,
        "creatorId": 0,
        "creatorTruename": "",
        "creatorUsername": "",
        "organName": "",
        "merchantTruename": "",
        "merchantUsername": "",
        "consigneeName": "突然的自我",
        "consigneePhone": "153****7763",
        "consigneeTelPhone": "*******7763",
        "consigneeCompany": "",
        "consigneeProvinceId": 0,
        "consigneeProvince": "四川省",
        "consigneeCityId": 0,
        "consigneeCity": "绵阳市",
        "consigneeDistrictId": 0,
        "consigneeDistrict": "涪城区",
        "consigneeAddress": "四川省****靓妍美妆",
        "sendProvinceId": 0,
        "sendProvince": "贵州省",
        "sendCityId": 0,
        "sendCity": "遵义市",
        "sendDistrictId": 0,
        "sendDistrict": "红花岗区",
        "senderName": "夜郎酒业",
        "senderCompany": "",
        "senderPhone": "155****7773",
        "senderTelPhone": "*******7773",
        "senderDetailAddress": "贵州省****中转仓库",
        "mailNo": "SF3150804745040",
        "subWaybillNoList": [],
        "waybillStatus": 50,
        "printSerialNumber": "",
        "printStatus": 0,
        "printNumber": 0,
        "orderValueAddedVo": null,
        "addedServiceCodes": [],
        "callFlag": "",
        "consignment": "夜郎酱宏图纯粮食大曲坤沙酒酱香型白酒礼盒装53度500ml",
        "consignmentNumber": 2,
        "parcelWeight": "2.0",
        "parcelWeightUnit": "2.0",
        "parcelQuantity": 1,
        "meterageWeightQty": "2.0",
        "realWeightQty": "2.0",
        "orderNo": "6938567762089547327|2kBWWcmNUwX2SZ",
        "originalOrderNo": "",
        "signBackNo": "",
        "remark": "",
        "orderCreateTime": "2025-01-10 15:29:41",
        "waybillCreateTime": "2025-01-10 15:29:41",
        "printTime": null,
        "isShowExcludeFile": 0,
        "freight": "1000.0",
        "referenceCost": "",
        "waybillNums": 1,
        "status": "",
        "exceptionFlag": 0,
        "promiseTime": "",
        "receiveTime": "2025-01-10 16:16:55",
        "signTime": "2025-01-11 14:13:40",
        "latestRouteInfo": "您的快件已由本人签收，如有疑问请电联快递员【杨发斌，电话：13330891935】。您的体验对于我们至关重要，如果您对我们的服务有任何的想法和建议，请随时联系我们，我们一定用心倾听，全力改进，不辜负您的信任与支持。",
        "latestOpCode": "80",
        "expressProductId": 0,
        "expressProductCode": "B1",
        "expressProductName": "电商标快",
        "expressPayMethod": 1,
        "expressPayMethodName": "寄付月结",
        "monthlyCard": "052***6969",
        "orderType": 1,
        "customField1": "",
        "customField2": "",
        "customField3": "",
        "amount": "",
        "collectionAmount": "",
        "collectingNumber": "",
        "oldCollectingMoney": "",
        "exceptionCode": "",
        "orderId": 0,
        "waybillId": 0,
        "isUpdateWaybill": 0,
        "mergeOrderType": 2,
        "isDraft": null,
        "failCause": "",
        "orderCrossBorderGoodsVoList": [
          {
            "productCode": "",
            "productName": "夜郎酱宏图纯粮食大曲坤沙酒酱香型白酒礼盒装53度500ml",
            "price": 0.0,
            "currencyCode": "",
            "currencyName": "",
            "unit": "",
            "productNumber": 2.0,
            "orderType": 0,
            "countryOfOrigin": ""
          }
        ],
        "gangAoTaiExtVo": null,
        "swFlag": 0,
        "sendStatus": 1,
        "sendStatusName": "获取成功",
        "expressCompanyMerchantId": 0,
        "totalLength": 41.0,
        "totalHeight": 1.0,
        "totalWidth": 1.0,
        "addedValueServiceInfo": {
          "insuredType": 0,
          "insuredPrice": null,
          "collectingMoney": null,
          "collectingMonthlyCard": "",
          "signBackName": [],
          "signBackNo": "",
          "signBackWaybillStatus": 0,
          "signBackOrderType": [],
          "signBackRouteList": [],
          "isSignBack": 0,
          "signBackRemark": "",
          "signBackNum": 0,
          "thirdSignBack": 0,
          "thirdConsigneeName": "",
          "thirdConsigneePhone": "",
          "thirdConsigneeTel": "",
          "thirdConsigneeProvince": "",
          "thirdConsigneeCity": "",
          "thirdConsigneeArea": "",
          "thirdConsigneeAddress": "",
          "thirdConsigneeCompany": "",
          "takePhotoBack": [],
          "takePhotoNum": 0,
          "takePhotoBackRemark": "",
          "timingSendInformType": 0,
          "timingSendInformDate": "",
          "timingSendInformTime": "",
          "electronicBack": 0,
          "secretKeyAuthentication": "",
          "secretKeyAuthenticationValue": "",
          "woodenPackage": 0,
          "woodenPackageInfo": "",
          "readySend": 0,
          "woodenRemovalNum": 0,
          "packagingService": "",
          "packagingMaterialVos": [],
          "overweightService": 0,
          "timingInsured": 0,
          "freshService": 0,
          "homeDeliveryExt": [],
          "installationType": 0,
          "installationContent": [],
          "selfPickup": 0,
          "exhibitionService": 0,
          "exhibitionExitService": 0,
          "addedServiceCodes": [],
          "customDeliveryTime": ""
        },
        "signBackInfo": "",
        "signBackNum": "",
        "pickupAppointTime": "",
        "consValueCurrencyCode": "",
        "exportDeclarationMethod": "",
        "customsBatchs": "",
        "taxAccount": "",
        "taxPaymentType": "",
        "custReferenceNo": "",
        "isSignBack": 0,
        "signBackRemark": "",
        "cancelTime": null
      },
      {
        "merchantId": 0,
        "organId": 0,
        "creatorId": 0,
        "creatorTruename": "",
        "creatorUsername": "",
        "organName": "",
        "merchantTruename": "",
        "merchantUsername": "",
        "consigneeName": "**",
        "consigneePhone": "157*********2541",
        "consigneeTelPhone": "************2541",
        "consigneeCompany": "",
        "consigneeProvinceId": 0,
        "consigneeProvince": "贵州省",
        "consigneeCityId": 0,
        "consigneeCity": "贵阳市",
        "consigneeDistrictId": 0,
        "consigneeDistrict": "修文县",
        "consigneeAddress": "贵州省****兽霸鞋店",
        "sendProvinceId": 0,
        "sendProvince": "贵州省",
        "sendCityId": 0,
        "sendCity": "遵义市",
        "sendDistrictId": 0,
        "sendDistrict": "红花岗区",
        "senderName": "小包",
        "senderCompany": "",
        "senderPhone": "155****1949",
        "senderTelPhone": "*******1949",
        "senderDetailAddress": "贵州省****菜鸟驿站",
        "mailNo": "SF3150809345059",
        "subWaybillNoList": [],
        "waybillStatus": 50,
        "printSerialNumber": "",
        "printStatus": 0,
        "printNumber": 0,
        "orderValueAddedVo": null,
        "addedServiceCodes": [],
        "callFlag": "",
        "consignment": "2024男鞋男士舒适时尚百搭黑色41",
        "consignmentNumber": 1,
        "parcelWeight": "2.5",
        "parcelWeightUnit": "2.5",
        "parcelQuantity": 1,
        "meterageWeightQty": "2.5",
        "realWeightQty": "2.5",
        "orderNo": "6938535195456968508|6780cc24dd560100",
        "originalOrderNo": "",
        "signBackNo": "",
        "remark": "驴孤品42码",
        "orderCreateTime": "2025-01-10 15:28:59",
        "waybillCreateTime": "2025-01-10 15:28:59",
        "printTime": null,
        "isShowExcludeFile": 0,
        "freight": "1000.0",
        "referenceCost": "",
        "waybillNums": 1,
        "status": "",
        "exceptionFlag": 0,
        "promiseTime": "",
        "receiveTime": "2025-01-10 18:42:03",
        "signTime": "2025-01-11 09:40:32",
        "latestRouteInfo": "您的快件已由本人签收，如有疑问请电联快递员【王昭发，电话：18143512989】。您的体验对于我们至关重要，如果您对我们的服务有任何的想法和建议，请随时联系我们，我们一定用心倾听，全力改进，不辜负您的信任与支持。",
        "latestOpCode": "80",
        "expressProductId": 0,
        "expressProductCode": "B1",
        "expressProductName": "电商标快",
        "expressPayMethod": 1,
        "expressPayMethodName": "寄付月结",
        "monthlyCard": "052***6969",
        "orderType": 1,
        "customField1": "",
        "customField2": "",
        "customField3": "",
        "amount": "",
        "collectionAmount": "",
        "collectingNumber": "",
        "oldCollectingMoney": "",
        "exceptionCode": "",
        "orderId": 0,
        "waybillId": 0,
        "isUpdateWaybill": 0,
        "mergeOrderType": 2,
        "isDraft": null,
        "failCause": "",
        "orderCrossBorderGoodsVoList": [
          {
            "productCode": "",
            "productName": "2024男鞋男士舒适时尚百搭黑色41",
            "price": 0.0,
            "currencyCode": "",
            "currencyName": "",
            "unit": "",
            "productNumber": 1.0,
            "orderType": 0,
            "countryOfOrigin": ""
          }
        ],
        "gangAoTaiExtVo": null,
        "swFlag": 0,
        "sendStatus": 1,
        "sendStatusName": "获取成功",
        "expressCompanyMerchantId": 0,
        "totalLength": 0.0,
        "totalHeight": 0.0,
        "totalWidth": 0.0,
        "addedValueServiceInfo": {
          "insuredType": 0,
          "insuredPrice": null,
          "collectingMoney": null,
          "collectingMonthlyCard": "",
          "signBackName": [],
          "signBackNo": "",
          "signBackWaybillStatus": 0,
          "signBackOrderType": [],
          "signBackRouteList": [],
          "isSignBack": 0,
          "signBackRemark": "",
          "signBackNum": 0,
          "thirdSignBack": 0,
          "thirdConsigneeName": "",
          "thirdConsigneePhone": "",
          "thirdConsigneeTel": "",
          "thirdConsigneeProvince": "",
          "thirdConsigneeCity": "",
          "thirdConsigneeArea": "",
          "thirdConsigneeAddress": "",
          "thirdConsigneeCompany": "",
          "takePhotoBack": [],
          "takePhotoNum": 0,
          "takePhotoBackRemark": "",
          "timingSendInformType": 0,
          "timingSendInformDate": "",
          "timingSendInformTime": "",
          "electronicBack": 0,
          "secretKeyAuthentication": "",
          "secretKeyAuthenticationValue": "",
          "woodenPackage": 0,
          "woodenPackageInfo": "",
          "readySend": 0,
          "woodenRemovalNum": 0,
          "packagingService": "",
          "packagingMaterialVos": [],
          "overweightService": 0,
          "timingInsured": 0,
          "freshService": 0,
          "homeDeliveryExt": [],
          "installationType": 0,
          "installationContent": [],
          "selfPickup": 0,
          "exhibitionService": 0,
          "exhibitionExitService": 0,
          "addedServiceCodes": [],
          "customDeliveryTime": ""
        },
        "signBackInfo": "",
        "signBackNum": "",
        "pickupAppointTime": "",
        "consValueCurrencyCode": "",
        "exportDeclarationMethod": "",
        "customsBatchs": "",
        "taxAccount": "",
        "taxPaymentType": "",
        "custReferenceNo": "",
        "isSignBack": 0,
        "signBackRemark": "",
        "cancelTime": null
      }
    ],
    "total": 5167,
    "size": 1000,
    "current": 1,
    "orders": [],
    "searchCount": true,
    "pages": 6
  }
}

3. 实现步骤

3.1 创建Java类

我们将创建一个名为MailNoExtractor的Java类，用于解析JSON数据并提取mailNo字段。

代码语言：javascript
复制
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class MailNoExtractor {

    public static List<String> extractMailNos(String json) throws IOException {
        ObjectMapper objectMapper = new ObjectMapper();
        JsonNode rootNode = objectMapper.readTree(json);
        JsonNode recordsNode = rootNode.path("result").path("records");

        List<String> mailNos = new ArrayList<>();

        for (JsonNode record : recordsNode) {
            String mailNo = record.path("mailNo").asText();
            mailNos.add(mailNo);
        }

        return mailNos;
    }

    public static void main(String[] args) {
/*
* 提示：该行代码过长，系统自动注释不进行高亮。一键复制会移除系统注释 
* String json = "{\"msg\":\"操作成功!\",\"code\":\"ok\",\"result\":{\"records\":[{\"merchantId\":0,\"organId\":0,\"creatorId\":0,\"creatorTruename\":\"\",\"creatorUsername\":\"\",\"organName\":\"\",\"merchantTruename\":\"\",\"merchantUsername\":\"\",\"consigneeName\":\"突然的自我\",\"consigneePhone\":\"153****7763\",\"consigneeTelPhone\":\"*******7763\",\"consigneeCompany\":\"\",\"consigneeProvinceId\":0,\"consigneeProvince\":\"四川省\",\"consigneeCityId\":0,\"consigneeCity\":\"绵阳市\",\"consigneeDistrictId\":0,\"consigneeDistrict\":\"涪城区\",\"consigneeAddress\":\"四川省****靓妍美妆\",\"sendProvinceId\":0,\"sendProvince\":\"贵州省\",\"sendCityId\":0,\"sendCity\":\"遵义市\",\"sendDistrictId\":0,\"sendDistrict\":\"红花岗区\",\"senderName\":\"夜郎酒业\",\"senderCompany\":\"\",\"senderPhone\":\"155****7773\",\"senderTelPhone\":\"*******7773\",\"senderDetailAddress\":\"贵州省****中转仓库\",\"mailNo\":\"SF3150804745040\",\"subWaybillNoList\":[],\"waybillStatus\":50,\"printSerialNumber\":\"\",\"printStatus\":0,\"printNumber\":0,\"orderValueAddedVo\":null,\"addedServiceCodes\":[],\"callFlag\":\"\",\"consignment\":\"夜郎酱宏图纯粮食大曲坤沙酒酱香型白酒礼盒装53度500ml\",\"consignmentNumber\":2,\"parcelWeight\":\"2.0\",\"parcelWeightUnit\":\"2.0\",\"parcelQuantity\":1,\"meterageWeightQty\":\"2.0\",\"realWeightQty\":\"2.0\",\"orderNo\":\"6938567762089547327|2kBWWcmNUwX2SZ\",\"originalOrderNo\":\"\",\"signBackNo\":\"\",\"remark\":\"\",\"orderCreateTime\":\"2025-01-10 15:29:41\",\"waybillCreateTime\":\"2025-01-10 15:29:41\",\"printTime\":null,\"isShowExcludeFile\":0,\"freight\":\"1000.0\",\"referenceCost\":\"\",\"waybillNums\":1,\"status\":\"\",\"exceptionFlag\":0,\"promiseTime\":\"\",\"receiveTime\":\"2025-01-10 16:16:55\",\"signTime\":\"2025-01-11 14:13:40\",\"latestRouteInfo\":\"您的快件已由本人签收，如有疑问请电联快递员【杨发斌，电话：13330891935】。您的体验对于我们至关重要，如果您对我们的服务有任何的想法和建议，请随时联系我们，我们一定用心倾听，全力改进，不辜负您的信任与支持。\",\"latestOpCode\":\"80\",\"expressProductId\":0,\"expressProductCode\":\"B1\",\"expressProductName\":\"电商标快\",\"expressPayMethod\":1,\"expressPayMethodName\":\"寄付月结\",\"monthlyCard\":\"052***6969\",\"orderType\":1,\"customField1\":\"\",\"customField2\":\"\",\"customField3\":\"\",\"amount\":\"\",\"collectionAmount\":\"\",\"collectingNumber\":\"\",\"oldCollectingMoney\":\"\",\"exceptionCode\":\"\",\"orderId\":0,\"waybillId\":0,\"isUpdateWaybill\":0,\"mergeOrderType\":2,\"isDraft\":null,\"failCause\":\"\",\"orderCrossBorderGoodsVoList\":[{\"productCode\":\"\",\"productName\":\"夜郎酱宏图纯粮食大曲坤沙酒酱香型白酒礼盒装53度500ml\",\"price\":0.0,\"currencyCode\":\"\",\"currencyName\":\"\",\"unit\":\"\",\"productNumber\":2.0,\"orderType\":0,\"countryOfOrigin\":\"\"}],\"gangAoTaiExtVo\":null,\"swFlag\":0,\"sendStatus\":1,\"sendStatusName\":\"获取成功\",\"expressCompanyMerchantId\":0,\"totalLength\":41.0,\"totalHeight\":1.0,\"totalWidth\":1.0,\"addedValueServiceInfo\":{\"insuredType\":0,\"insuredPrice\":null,\"collectingMoney\":null,\"collectingMonthlyCard\":\"\",\"signBackName\":[],\"signBackNo\":\"\",\"signBackWaybillStatus\":0,\"signBackOrderType\":[],\"signBackRouteList\":[],\"isSignBack\":0,\"signBackRemark\":\"\",\"signBackNum\":0,\"thirdSignBack\":0,\"thirdConsigneeName\":\"\",\"thirdConsigneePhone\":\"\",\"thirdConsigneeTel\":\"\",\"thirdConsigneeProvince\":\"\",\"thirdConsigneeCity\":\"\",\"thirdConsigneeArea\":\"\",\"thirdConsigneeAddress\":\"\",\"thirdConsigneeCompany\":\"\",\"takePhotoBack\":[],\"takePhotoNum\":0,\"takePhotoBackRemark\":\"\",\"timingSendInformType\":0,\"timingSendInformDate\":\"\",\"timingSendInformTime\":\"\",\"electronicBack\":0,\"secretKeyAuthentication\":\"\",\"secretKeyAuthenticationValue\":\"\",\"woodenPackage\":0,\"woodenPackageInfo\":\"\",\"readySend\":0,\"woodenRemovalNum\":0,\"packagingService\":\"\",\"packagingMaterialVos\":[],\"overweightService\":0,\"timingInsured\":0,\"freshService\":0,\"homeDeliveryExt\":[],\"installationType\":0,\"installationContent\":[],\"selfPickup\":0,\"exhibitionService\":0,\"exhibitionExitService\":0,\"addedServiceCodes\":[],\"customDeliveryTime\":\"\"},\"signBackInfo\":\"\",\"signBackNum\":\"\",\"pickupAppointTime\":\"\",\"consValueCurrencyCode\":\"\",\"exportDeclarationMethod\":\"\",\"customsBatchs\":\"\",\"taxAccount\":\"\",\"taxPaymentType\":\"\",\"custReferenceNo\":\"\",\"isSignBack\":0,\"signBackRemark\":\"\",\"cancelTime\":null},{\"merchantId\":0,\"organId\":0,\"creatorId\":0,\"creatorTruename\":\"\",\"creatorUsername\":\"\",\"organName\":\"\",\"merchantTruename\":\"\",\"merchantUsername\":\"\",\"consigneeName\":\"**\",\"consigneePhone\":\"157*********2541\",\"consigneeTelPhone\":\"************2541\",\"consigneeCompany\":\"\",\"consigneeProvinceId\":0,\"consigneeProvince\":\"贵州省\",\"consigneeCityId\":0,\"consigneeCity\":\"贵阳市\",\"consigneeDistrictId\":0,\"consigneeDistrict\":\"修文县\",\"consigneeAddress\":\"贵州省****兽霸鞋店\",\"sendProvinceId\":0,\"sendProvince\":\"贵州省\",\"sendCityId\":0,\"sendCity\":\"遵义市\",\"sendDistrictId\":0,\"sendDistrict\":\"红花岗区\",\"senderName\":\"小包\",\"senderCompany\":\"\",\"senderPhone\":\"155****1949\",\"senderTelPhone\":\"*******1949\",\"senderDetailAddress\":\"贵州省****菜鸟驿站\",\"mailNo\":\"SF3150809345059\",\"subWaybillNoList\":[],\"waybillStatus\":50,\"printSerialNumber\":\"\",\"printStatus\":0,\"printNumber\":0,\"orderValueAddedVo\":null,\"addedServiceCodes\":[],\"callFlag\":\"\",\"consignment\":\"2024男鞋男士舒适时尚百搭黑色41\",\"consignmentNumber\":1,\"parcelWeight\":\"2.5\",\"parcelWeightUnit\":\"2.5\",\"parcelQuantity\":1,\"meterageWeightQty\":\"2.5\",\"realWeightQty\":\"2.5\",\"orderNo\":\"6938535195456968508|6780cc24dd560100\",\"originalOrderNo\":\"\",\"signBackNo\":\"\",\"remark\":\"驴孤品42码\",\"orderCreateTime\":\"2025-01-10 15:28:59\",\"waybillCreateTime\":\"2025-01-10 15:28:59\",\"printTime\":null,\"isShowExcludeFile\":0,\"freight\":\"1000.0\",\"referenceCost\":\"\",\"waybillNums\":1,\"status\":\"\",\"exceptionFlag\":0,\"promiseTime\":\"\",\"receiveTime\":\"2025-01-10 18:42:03\",\"signTime\":\"2025-01-11 09:40:32\",\"latestRouteInfo\":\"您的快件已由本人签收，如有疑问请电联快递员【王昭发，电话：18143512989】。您的体验对于我们至关重要，如果您对我们的服务有任何的想法和建议，请随时联系我们，我们一定用心倾听，全力改进，不辜负您的信任与支持。\",\"latestOpCode\":\"80\",\"expressProductId\":0,\"expressProductCode\":\"B1\",\"expressProductName\":\"电商标快\",\"expressPayMethod\":1,\"expressPayMethodName\":\"寄付月结\",\"monthlyCard\":\"052***6969\",\"orderType\":1,\"customField1\":\"\",\"customField2\":\"\",\"customField3\":\"\",\"amount\":\"\",\"collectionAmount\":\"\",\"collectingNumber\":\"\",\"oldCollectingMoney\":\"\",\"exceptionCode\":\"\",\"orderId\":0,\"waybillId\":0,\"isUpdateWaybill\":0,\"mergeOrderType\":2,\"isDraft\":null,\"failCause\":\"\",\"orderCrossBorderGoodsVoList\":[{\"productCode\":\"\",\"productName\":\"2024男鞋男士舒适时尚百搭黑色41\",\"price\":0.0,\"currencyCode\":\"\",\"currencyName\":\"\",\"unit\":\"\",\"productNumber\":1.0,\"orderType\":0,\"countryOfOrigin\":\"\"}],\"gangAoTaiExtVo\":null,\"swFlag\":0,\"sendStatus\":1,\"sendStatusName\":\"获取成功\",\"expressCompanyMerchantId\":0,\"totalLength\":0.0,\"totalHeight\":0.0,\"totalWidth\":0.0,\"addedValueServiceInfo\":{\"insuredType\":0,\"insuredPrice\":null,\"collectingMoney\":null,\"collectingMonthlyCard\":\"\",\"signBackName\":[],\"signBackNo\":\"\",\"signBackWaybillStatus\":0,\"signBackOrderType\":[],\"signBackRouteList\":[],\"isSignBack\":0,\"signBackRemark\":\"\",\"signBackNum\":0,\"thirdSignBack\":0,\"thirdConsigneeName\":\"\",\"thirdConsigneePhone\":\"\",\"thirdConsigneeTel\":\"\",\"thirdConsigneeProvince\":\"\",\"thirdConsigneeCity\":\"\",\"thirdConsigneeArea\":\"\",\"thirdConsigneeAddress\":\"\",\"thirdConsigneeCompany\":\"\",\"takePhotoBack\":[],\"takePhotoNum\":0,\"takePhotoBackRemark\":\"\",\"timingSendInformType\":0,\"timingSendInformDate\":\"\",\"timingSendInformTime\":\"\",\"electronicBack\":0,\"secretKeyAuthentication\":\"\",\"secretKeyAuthenticationValue\":\"\",\"woodenPackage\":0,\"woodenPackageInfo\":\"\",\"readySend\":0,\"woodenRemovalNum\":0,\"packagingService\":\"\",\"packagingMaterialVos\":[],\"overweightService\":0,\"timingInsured\":0,\"freshService\":0,\"homeDeliveryExt\":[],\"installationType\":0,\"installationContent\":[],\"selfPickup\":0,\"exhibitionService\":0,\"exhibitionExitService\":0,\"addedServiceCodes\":[],\"customDeliveryTime\":\"\"},\"signBackInfo\":\"\",\"signBackNum\":\"\",\"pickupAppointTime\":\"\",\"consValueCurrencyCode\":\"\",\"exportDeclarationMethod\":\"\",\"customsBatchs\":\"\",\"taxAccount\":\"\",\"taxPaymentType\":\"\",\"custReferenceNo\":\"\",\"isSignBack\":0,\"signBackRemark\":\"\",\"cancelTime\":null}],\"total\":5167,\"size\":1000,\"current\":1,\"orders\":[],\"searchCount\":true,\"pages\":6}}";
*/

        try {
            List<String> mailNos = extractMailNos(json);
            for (String mailNo : mailNos) {
                System.out.println(mailNo);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
3.2 代码解析
3.2.1 extractMailNos 方法
  • 功能：该方法接收一个JSON字符串作为输入，使用Jackson库解析JSON，并提取出所有mailNo字段的值，返回一个包含所有mailNo的列表。
  • 步骤：
    1. 使用ObjectMapper将JSON字符串解析为JsonNode对象。
    2. 通过path方法获取result节点下的records数组。
    3. 遍历records数组，提取每个记录中的mailNo字段，并将其添加到列表中。
3.2.2 main 方法
  • 功能：这是一个简单的测试方法，展示了如何使用extractMailNos方法来提取mailNo并打印出来。
  • 步骤：
    1. 定义一个JSON字符串。
    2. 调用extractMailNos方法提取mailNo。
    3. 遍历并打印所有mailNo。
3.3 运行结果

运行上述代码后，输出结果如下：

代码语言：javascript
复制
SF3150804745040
SF3150809345059

4. 总结

本文详细介绍了如何使用Java解析JSON数据并提取特定字段。通过使用Jackson库，我们可以轻松地处理复杂的JSON数据结构，并提取出我们需要的字段。这个工具类可以根据实际需求进一步扩展和优化，例如添加异常处理、支持更多字段的提取等。

希望本文对你理解和使用Java处理JSON数据有所帮助！如果你有任何问题或建议，欢迎在评论区留言。

本文参与 腾讯云自媒体同步曝光计划，分享自作者个人站点/博客。
原始发表：2025-11-12，如有侵权请联系 cloudcommunity@tencent.com 删除
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目录
  • 使用Java解析JSON数据并提取特定字段：以提取mailNo为例
    • 1. 背景介绍
      • 1.1 JSON简介
      • 1.2 实际案例
    • 2. 准备工作
      • 2.1 环境搭建
      • 2.2 JSON数据结构
    • 3. 实现步骤
      • 3.1 创建Java类
      • 3.2 代码解析
      • 3.3 运行结果
    • 4. 总结
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