Java的json解析单个找出指定节点和 json格式数据快速解析生成实体类

冷不防 2022-03-12 04:00 641阅读 0赞

**目录**

github测试项目地址：

\* @方法一：通过解析json，并转存进去实体类

\* 方法二：不直接转实体类，通过层层提取节点提取数据

--------------------

# github详细测试项目地址： #

[https://github.com/Yellow213/ConvenienceTools][https_github.com_Yellow213_ConvenienceTools]

# \* @方法一：通过解析json，并转存进去实体类 #

\* 优点：自动解析，方便快捷,且维护性较好。  
 \* 缺点：那种方法是将所有的东西都要解析出来，其实好几个类压根没用用的，也就是说那几个类其实是垃圾类，但是如果不写，那么就会报错。

上代码：

import com.dist.model.*;
    import net.sf.json.JSONObject;
    import net.sf.json.JsonConfig;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.junit.runners.JUnit4;
    
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.Map;
    import java.util.Objects;
    
    /**
     * @author hh
     * @date 2019/02/28
     * @方法一：通过解析json，并转存进去实体类
     * 优点：自动解析，方便快捷,且维护性较好。
     * 缺点：那种方法是将所有的东西都要解析出来，其实好几个类压根没用用的，也就是说那几个类其实是垃圾类，但是如果不写，那么就会报错。
     */
    @RunWith(JUnit4.class)
    public class DriverTestClass {
        @Test
        public void test01()throws Exception{
        	//（1）当获取到一条信息的时候，通过层层的解析，获得json数据
            String str ="{\"orderCode\":\"346\",\"userName\":\"136\",\"customerName\":\"小明\",\"provinceCode\":\"190\",\"cityCode\":\"000\",\"districtCode\":\"000\",\"customerAddress\":\"广东省广州市\",\"mobNum\":\"136\",\"orderSaleTime\":\"2019-02-01 23:04:26\",\"evaluationMark\":\"0\",\"invoiceHead\":\"小明\",\"orderTotalStatus\":\"30\",\"provinceName\":\"广东省\",\"cityName\":\"广州市\",\"districtName\":\"xX区\",\"sellerOrdRemark\":\"E3\",\"buyerOrdRemark\":\"\",\"invoiceType\":\"02\",\"invoice\":\"\",\"vatTaxpayerNumber\":\"\",\"registerAddress\":\"\",\"registerPhone\":\"\",\"bank\":\"\",\"account\":\"\",\"invoiceRecipientAddress\":\"\",\"invoiceRecipientName\":\"\",\"invoiceRecipientPhone\":\"\",\"invoiceRecipientHandPhone\":\"\",\"payType\":\"\",\"payTotalAmount\":\"\",\"needinvoiceflag\":\"Y\",\"isCanModifyTransportFee\":\"N\",\"guideAccountNo\":\"\",\"orderTime\":\"2019-02-01 23:02:53\",\"colorMarkFlags\":\"2\",\"phoneNum\":\"\",\"zipCode\":\"\",\"deliveryArea\":\"0200499\",\"detailAddress\":\"世外桃源\",\"countMoney\":\"490.00000\",\"sumDonationAmt\":\"0.00\",\"orderDetail\":[{\"productCode\":\"10668919671\",\"productName\":\"周生�?(CHOW SANG SANG)时尚黄金K金链18K金项�? 百搭素链 04800N18KY定价 40厘米\",\"unitPrice\":\"530.00000\",\"payAmount\":\"490.00000\",\"saleNum\":\"1.00000\",\"orderLineStatus\":\"30\",\"transportFee\":\"0.00000\",\"returnOrderFlag\":\"0\",\"coupontotalMoney\":\"40.00000\",\"vouchertotalMoney\":\"\",\"invCode\":\"\",\"orderLineNumber\":\"00662135679001\",\"itemCode\":\"04800N18KY-FJ-40-\",\"receivezipCode\":\"\",\"hwgFlag\":\"\",\"disType\":\"\",\"orderchannel\":\"MOBILE|01|01|7.4.2|20000\",\"prmtcode\":\"\",\"bLineNumber\":\"34662678213\",\"expresscompanycode\":\"E01\",\"expressno\":\"1154271476617\",\"phoneIdentifyCode\":\"\",\"payorderid\":\"\",\"packageorderid\":\"\",\"fpsdeliveryflag\":\"0\",\"activitytype\":\"\",\"reservedepositamount\":\"\",\"reservebalanceamount\":\"\",\"reservestatus\":\"\",\"mode\":\"\",\"itemTaxFare\":\"\",\"declareItemPrice\":\"\",\"declareItemTaxfare\":\"\",\"declareGoodsAmount\":\"\",\"carShopSerWay\":\"\",\"carShopCode\":\"\",\"carShopName\":\"\",\"carShopAddr\":\"\",\"carShopTel\":\"\",\"orderPayCode\":\"01\",\"dealPhoto\":\"http://sphss.suning.com/productspan/show.html?key=BkUDE9YNdQ4EkEshUJOTiAnYKNwU171TR5lXpgy%2F8UwpnL3SbTTXgW2LODzhNM7t\",\"isProsupplierDelivery\":\"0\",\"lpgOrderFlag\":\"\",\"serviceItemFlag\":\"0\",\"paymentList\":[{\"paycode\":\"6901\",\"banktypecode\":\"20001\",\"payamount\":\"30.00000\",\"offLinePayFlag\":\"\",\"alipayPayNo\":\"\"},{\"paycode\":\"6901\",\"banktypecode\":\"10006\",\"payamount\":\"10.00000\",\"offLinePayFlag\":\"\",\"alipayPayNo\":\"\"},{\"paycode\":\"6903\",\"banktypecode\":\"\",\"payamount\":\"0.01000\",\"offLinePayFlag\":\"\",\"alipayPayNo\":\"\"},{\"paycode\":\"4148\",\"banktypecode\":\"\",\"payamount\":\"489.99000\",\"offLinePayFlag\":\"\",\"alipayPayNo\":\"\"}],\"couponList\":[{\"coupontype\":\"8012\",\"sharelimit\":\"0.00000\"}],\"orderChannels\":[{\"orderChannelCode\":\"2\"}],\"activityTypes\":[],\"payTypes\":[],\"payerIdNumber\":\"\",\"payerCustomerName\":\"\",\"otoOrderType\":\"\",\"otoStoreCode\":\"\",\"otoStoreName\":\"\",\"expandAmount\":\"\",\"refVerifyCode\":\"\",\"orderServiceTypeMulti\":\"\",\"popContractInfo\":{},\"deliveryTime\":\"2019-02-02 13:33:52\",\"sendType\":\"1\",\"selfDeliveryName\":\"\",\"selfDeliveryMobile\":\"\",\"returnFlag\":\"\",\"complainFlag\":\"0\",\"logisticsOrderId\":\"E018\",\"carService\":{},\"orderTagList\":\"\",\"donationProjectInfo\":{\"donationProjectId\":\"\",\"donationAmt\":\"0.00\"}}]}";
            //(2)解析json数据，并把数据放到map里面
            JSONObject json = JSONObject.fromObject(str);
            Map classMap = new HashMap();
            classMap.put("orderDetail",OrderDetail.class);
            classMap.put("paymentList", Payment.class);
            classMap.put("couponList", Coupon.class);
            classMap.put("orderChannels", OrderChannel.class);
            classMap.put("donationProjectInfo",DonationProjectInfo.class);
            classMap.put("activityTypes", Object.class);
            //（3）这个作用是输出name和class
            JsonConfig config = new JsonConfig();
            config.setIgnoreDefaultExcludes(true);
            //（4）自动转化，塞进去实体类
            OrderGet orderGet = (OrderGet) JSONObject.toBean(json,OrderGet.class,classMap);
            //（5）通过实体类直接可以提取数据。十分方便快捷
            System.out.println("显示json中的数据："+orderGet.getOrderDetail().get(0).getProductCode());
            System.out.println("显示最外层json中的数据："+orderGet.getOrderCode()+","+orderGet.getOrderCode());
        }
    }

输出结果：

![20190305093254210.png][]

实体类：（根据上边详细对应节点写上即可）

![20190305092248272.png][]

git地址：[https://github.com/Yellow213/ConvenienceTools][https_github.com_Yellow213_ConvenienceTools]

#  \* 方法二：不直接转实体类，通过层层提取节点提取数据 #

\* 优点：按照需求去提取数据，不需要写多余无关的类，且不容易报错。（提取数据少的时候推荐使用）  
 \* 缺点：维护性较差，每次提取多一个节点数据，需要人工去写。

JSONObject obj = JSONObject.fromObject(json);  
 System.out.println(obj.getString("orderCode"));

上代码：

import org.junit.Test;
    
    import net.sf.json.JSONArray;
    import net.sf.json.JSONObject;
    
    public class DirverTestClass2 {
    
    /**
     * @author hh
     * @date 2019/02/28
     * @方法二：不直接转实体类，通过层层提取节点提取数据
     * 备注：
     * 方法一：那种方法是将所有的东西都要解析出来，其实好几个类压根没用用的，也就是说那几个类其实是垃圾类，但是如果不写，那么就会报错。
     * 方法二：
     * 优点：按照需求去提取数据，不需要写多余无关的类，且不容易报错。（提取数据少的时候推荐使用）
     * 缺点：维护性较差，每次提取多一个节点数据，需要人工去写。
     */
    	@Test
    	public void test() {
            String str ="{\"orderCode\":\"346\",\"userName\":\"136\",\"customerName\":\"小明\",\"provinceCode\":\"190\",\"cityCode\":\"000\",\"districtCode\":\"000\",\"customerAddress\":\"广东省广州市\",\"mobNum\":\"136\",\"orderSaleTime\":\"2019-02-01 23:04:26\",\"evaluationMark\":\"0\",\"invoiceHead\":\"小明\",\"orderTotalStatus\":\"30\",\"provinceName\":\"广东省\",\"cityName\":\"广州市\",\"districtName\":\"xX区\",\"sellerOrdRemark\":\"E3\",\"buyerOrdRemark\":\"\",\"invoiceType\":\"02\",\"invoice\":\"\",\"vatTaxpayerNumber\":\"\",\"registerAddress\":\"\",\"registerPhone\":\"\",\"bank\":\"\",\"account\":\"\",\"invoiceRecipientAddress\":\"\",\"invoiceRecipientName\":\"\",\"invoiceRecipientPhone\":\"\",\"invoiceRecipientHandPhone\":\"\",\"payType\":\"\",\"payTotalAmount\":\"\",\"needinvoiceflag\":\"Y\",\"isCanModifyTransportFee\":\"N\",\"guideAccountNo\":\"\",\"orderTime\":\"2019-02-01 23:02:53\",\"colorMarkFlags\":\"2\",\"phoneNum\":\"\",\"zipCode\":\"\",\"deliveryArea\":\"0200499\",\"detailAddress\":\"世外桃源\",\"countMoney\":\"490.00000\",\"sumDonationAmt\":\"0.00\",\"orderDetail\":[{\"productCode\":\"10668919671\",\"productName\":\"周生�?(CHOW SANG SANG)时尚黄金K金链18K金项�? 百搭素链 04800N18KY定价 40厘米\",\"unitPrice\":\"530.00000\",\"payAmount\":\"490.00000\",\"saleNum\":\"1.00000\",\"orderLineStatus\":\"30\",\"transportFee\":\"0.00000\",\"returnOrderFlag\":\"0\",\"coupontotalMoney\":\"40.00000\",\"vouchertotalMoney\":\"\",\"invCode\":\"\",\"orderLineNumber\":\"00662135679001\",\"itemCode\":\"04800N18KY-FJ-40-\",\"receivezipCode\":\"\",\"hwgFlag\":\"\",\"disType\":\"\",\"orderchannel\":\"MOBILE|01|01|7.4.2|20000\",\"prmtcode\":\"\",\"bLineNumber\":\"34662678213\",\"expresscompanycode\":\"E01\",\"expressno\":\"1154271476617\",\"phoneIdentifyCode\":\"\",\"payorderid\":\"\",\"packageorderid\":\"\",\"fpsdeliveryflag\":\"0\",\"activitytype\":\"\",\"reservedepositamount\":\"\",\"reservebalanceamount\":\"\",\"reservestatus\":\"\",\"mode\":\"\",\"itemTaxFare\":\"\",\"declareItemPrice\":\"\",\"declareItemTaxfare\":\"\",\"declareGoodsAmount\":\"\",\"carShopSerWay\":\"\",\"carShopCode\":\"\",\"carShopName\":\"\",\"carShopAddr\":\"\",\"carShopTel\":\"\",\"orderPayCode\":\"01\",\"dealPhoto\":\"http://sphss.suning.com/productspan/show.html?key=BkUDE9YNdQ4EkEshUJOTiAnYKNwU171TR5lXpgy%2F8UwpnL3SbTTXgW2LODzhNM7t\",\"isProsupplierDelivery\":\"0\",\"lpgOrderFlag\":\"\",\"serviceItemFlag\":\"0\",\"paymentList\":[{\"paycode\":\"6901\",\"banktypecode\":\"20001\",\"payamount\":\"30.00000\",\"offLinePayFlag\":\"\",\"alipayPayNo\":\"\"},{\"paycode\":\"6901\",\"banktypecode\":\"10006\",\"payamount\":\"10.00000\",\"offLinePayFlag\":\"\",\"alipayPayNo\":\"\"},{\"paycode\":\"6903\",\"banktypecode\":\"\",\"payamount\":\"0.01000\",\"offLinePayFlag\":\"\",\"alipayPayNo\":\"\"},{\"paycode\":\"4148\",\"banktypecode\":\"\",\"payamount\":\"489.99000\",\"offLinePayFlag\":\"\",\"alipayPayNo\":\"\"}],\"couponList\":[{\"coupontype\":\"8012\",\"sharelimit\":\"0.00000\"}],\"orderChannels\":[{\"orderChannelCode\":\"2\"}],\"activityTypes\":[],\"payTypes\":[],\"payerIdNumber\":\"\",\"payerCustomerName\":\"\",\"otoOrderType\":\"\",\"otoStoreCode\":\"\",\"otoStoreName\":\"\",\"expandAmount\":\"\",\"refVerifyCode\":\"\",\"orderServiceTypeMulti\":\"\",\"popContractInfo\":{},\"deliveryTime\":\"2019-02-02 13:33:52\",\"sendType\":\"1\",\"selfDeliveryName\":\"\",\"selfDeliveryMobile\":\"\",\"returnFlag\":\"\",\"complainFlag\":\"0\",\"logisticsOrderId\":\"E018\",\"carService\":{},\"orderTagList\":\"\",\"donationProjectInfo\":{\"donationProjectId\":\"\",\"donationAmt\":\"0.00\"}}]}";
            //(1)解析json数据，并把数据放到map里面
            JSONObject json = JSONObject.fromObject(str);
    	    JSONObject obj = JSONObject.fromObject(json);
    	    System.out.println(obj.getString("orderCode"));
    	    System.out.println(obj.getString("userName"));
    	    System.out.println(obj.getString("customerName"));
    	    System.out.println(obj.getString("customerAddress"));
    	    System.out.println(obj.getString("mobNum"));
    	    System.out.println(obj.getString("orderSaleTime"));
    	    System.out.println(obj.getString("orderTotalStatus"));
    	    System.out.println(obj.getString("provinceCode"));
    	    System.out.println(obj.getString("cityCode"));
    	    System.out.println(obj.getString("districtName"));
    	    System.out.println(obj.getString("sellerOrdRemark"));
    	    //（2）解析下边一层，提取数组里面第一个json里面的节点
    	    JSONArray json2 = json.getJSONArray("orderDetail");
    	    JSONObject obj2 = JSONObject.fromObject(json2.get(0));
    	    System.out.println("继续解析里面的一层，提取自己需要的数据");
    	    System.out.println("obj2.getJSONObject(\"donationProjectInfo\").getString(\"donationAmt\"):"+obj2.getJSONObject("donationProjectInfo").getString("donationAmt"));
    	    
    	}
    
    }

输出结果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NDExODc0_size_16_color_FFFFFF_t_70][]

[https_github.com_Yellow213_ConvenienceTools]: https://github.com/Yellow213/ConvenienceTools
[20190305093254210.png]: /images/20220312/95229f39b8484937aeda4daa22e35cfe.png
[20190305092248272.png]: /images/20220312/604fbb1985b3470c96f9a708e42ee225.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NDExODc0_size_16_color_FFFFFF_t_70]: /images/20220312/8596719c4ed04cfea65680dd687b62c0.png