一、引入的jar包
json-lib-2.4-jdk15.jar
二、Json字符串转换为其他对象
1、对象==》json字符串 2、list和Map集合==》json字符串 3、Map集合==》json字符串【具体代码如下】
import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.List; import java.util.Map; import java.util.Map.Entry; import java.util.TreeMap; import com.coscon.ferightEntrust.vo.CdViewVo; import net.sf.json.JSONArray; import net.sf.json.JSONObject; public class TestCd { public static void main(String[] args) { collectToStr(); } private static void collectToStr(){ CdViewVo cvv=new CdViewVo(); cvv.setCntrNum("CBHU898637"); cvv.setSealNum("CBHU898637"); cvv.setCntrType("20Gp"); cvv.setObTrafficTerm("jkd"); cvv.setIbTrafficTerm("P-预付"); cvv.setPackDesc("12"); cvv.setGrossWt("100"); cvv.setVol("54.23"); CdViewVo cvv2=new CdViewVo(); cvv2.setCntrNum("CBHU893437"); cvv2.setSealNum("CBHU893437"); cvv2.setCntrType("40Gp"); cvv2.setObTrafficTerm("bhc"); cvv2.setIbTrafficTerm("P-预付"); cvv2.setPackDesc("21"); cvv2.setGrossWt("10"); cvv2.setVol("84.23"); //Java对象 JSONObject cvvo=JSONObject.fromObject(cvv); String cvvs=cvvo.toString(); System.out.println("CdViewVo的json字符串："+cvvs); //map集合 Map<String, String> tm=new TreeMap<String, String>(); tm.put("a", "ddd"); tm.put("b", "ccc"); tm.put("c", "bbb"); tm.put("d", "aaa"); JSONArray array=JSONArray.fromObject(tm); String tmstr=array.toString(); System.out.println("Map集合对应的json字符串："+tmstr); //list集合 List<CdViewVo> list=new ArrayList<CdViewVo>(); list.add(cvv); list.add(cvv2); JSONArray listArr=JSONArray.fromObject(list); String listStr=listArr.toString(); System.out.println("listStr集合对应的json字符串："+listStr); } } |
运行结果如下：
CdViewVo的json字符串：{"cntrNum":"CBHU898637","cntrType":"20Gp","grossWt":"100","ibTrafficTerm":"P-预付","obTrafficTerm":"jkd","packDesc":"12","packNum":"","sealNum":"CBHU898637","vol":"54.23"}
