Java?從json提取數(shù)組并轉(zhuǎn)換為list的操作方法

更新時(shí)間：2022年10月27日 10:15:32 作者：滕青山Y(jié)YDS

這篇文章主要介紹了Java?從json提取出數(shù)組并轉(zhuǎn)換為list,使用getJSONArray()獲取到j(luò)sonarray后，再將jsonArray轉(zhuǎn)換為字符串，最后將字符串解析為L(zhǎng)ist列表，本文通過(guò)實(shí)例代碼給大家詳細(xì)講解，需要的朋友可以參考下

Java 從json提取數(shù)組并轉(zhuǎn)換為list

這里ret表示json字符串原文

// 解析為JSONObject 
JSONObject jsonObject = JSONObject.parseObject(ret);
// 提取出JSONArray 
JSONArray jsonArray = new JSONArray(jsonObject.getJSONObject("result").getJSONArray("org_list"));
// 將JSONArray轉(zhuǎn)為L(zhǎng)ist列表
String str = JSONObject.toJSONString(jsonArray);
List<Org> list = JSONObject.parseArray(str, Org.class);

使用getJSONArray()獲取到j(luò)sonarray后，再將jsonArray轉(zhuǎn)換為字符串，最后將字符串解析為L(zhǎng)ist列表。

代碼中的Org是我List列表中元素的類型。

Java單個(gè)對(duì)象和List對(duì)象轉(zhuǎn)換成Json，Json轉(zhuǎn)List

（一）使用單個(gè)對(duì)象轉(zhuǎn)換JSON對(duì)象

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
 
import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.junit.Test;
 
import com.css.eshop.exception.DataAccessException;
import com.css.eshop.model.VoucherInfo;
import com.css.eshop.util.HttpClientUtil;
import com.css.eshop.util.LoadStaticReferenceTables;
 
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
 
public class TestPut {
	protected Log logger = LogFactory.getLog(this.getClass().getName());
	
	@Test
	public void getOneJson(){//測(cè)試轉(zhuǎn)換成Json,單個(gè)對(duì)象
		VoucherInfo vo1=new VoucherInfo();
		vo1.setVoucherValue(2131);vo1.setVoucherCode("小可愛(ài)的");
		JSONObject updateJsonObj = JSONObject.fromObject(vo1);//轉(zhuǎn)換成json格式
		logger.info("---轉(zhuǎn)換成json格式:---"+updateJsonObj.toString());//提取access_token節(jié)點(diǎn)數(shù)據(jù)
	}
}

輸出轉(zhuǎn)換后日志：

17-10-2018 17:35 INFO TestPut:35 - ---轉(zhuǎn)換成json格式:---{"labourCost":0,"refMetalPrice":0,"voucherCoNumber":"","voucherCode":"小可愛(ài)的","voucherType":"","voucherValue":2131,"weight":0,"weightUnit":""}

（二）多個(gè)對(duì)象存到List，再轉(zhuǎn)換成JSON

	@Test
	public void getArrayList(){//測(cè)試轉(zhuǎn)換成Json，List轉(zhuǎn)換成JSONList
		List<VoucherInfo> vouchersList=new ArrayList<VoucherInfo>();
		VoucherInfo vo1=new VoucherInfo();
		VoucherInfo vo2=new VoucherInfo();
		vo1.setVoucherValue(2131);vo1.setVoucherCode("小可愛(ài)的");
		vo2.setVoucherValue(100);vo2.setVoucherCode("小可愛(ài)的222");
		vouchersList.add(vo1);vouchersList.add(vo2);
		JSONArray jsonArray = JSONArray.fromObject(vouchersList);
		logger.info("--獲取到轉(zhuǎn)換為json格式的內(nèi)容:"+jsonArray.toString());//提取access_token節(jié)點(diǎn)數(shù)據(jù)
		
	}

輸出日志：

17-10-2018 17:36 INFO TestPut:47 - --獲取到轉(zhuǎn)換為json格式的內(nèi)容:[{"labourCost":0,"refMetalPrice":0,"voucherCoNumber":"","voucherCode":"小可愛(ài)的","voucherType":"","voucherValue":2131,"weight":0,"weightUnit":""},{"labourCost":0,"refMetalPrice":0,"voucherCoNumber":"","voucherCode":"小可愛(ài)的222","voucherType":"","voucherValue":100,"weight":0,"weightUnit":""}]

（三）json的list對(duì)象轉(zhuǎn)List對(duì)象

先轉(zhuǎn)jsonArray，再轉(zhuǎn)object提取數(shù)據(jù)

	@Test
	public void test1210() {
		List<VoucherInfo> vouchers=new ArrayList<VoucherInfo>();
		VoucherInfo voucherInfo1=new VoucherInfo();VoucherInfo voucherInfo2=new VoucherInfo();
		voucherInfo1.setVoucherCode("coupncdeC0000003");voucherInfo1.setVoucherType("DISC_VOUCHER");
		voucherInfo1.setVoucherCoNumber(null);voucherInfo1.setLabourCost(0.0);voucherInfo1.setWeight(0.0);
		voucherInfo1.setVoucherValue(1000.0);voucherInfo1.setRefMetalPrice(0.0);
		
		voucherInfo2.setVoucherCode("coupncdeC0000001");voucherInfo2.setVoucherType("DISC_VOUCHER");
		voucherInfo2.setVoucherCoNumber(null);voucherInfo2.setLabourCost(0.0);voucherInfo2.setWeight(0.0);
		voucherInfo2.setVoucherValue(1000.0);voucherInfo2.setRefMetalPrice(0.0);
		vouchers.add(voucherInfo1);vouchers.add(voucherInfo2);
		double ecoupon_amt=0;
		if(null != vouchers  && vouchers.size()>0){
			JSONArray vouchersListJsonArray = JSONArray.fromObject(vouchers);
			String vouchersListJson=vouchersListJsonArray.toString();
			
			System.out.println(vouchersListJson);
			if(null != vouchersListJson){
				JSONArray jsonArray1 = JSONArray.fromObject(vouchersListJson);
				//循環(huán)獲取json數(shù)組中的 json 對(duì)象，然后轉(zhuǎn)換為 object
		        for (int j = 0; j < jsonArray1.size(); j++) {  
		            JSONObject jsonObject2 = jsonArray1.getJSONObject(j);  
		            VoucherInfo cust = (VoucherInfo) JSONObject.toBean(jsonObject2, VoucherInfo.class);  
		            ecoupon_amt=ecoupon_amt+cust.getVoucherValue();
		        }  
			}
		}
		System.out.println(ecoupon_amt);
	}

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