JAVA 实现XML与JSON 相互转换

原文地址https://blog.csdn.net/congcong68/article/details/39029907

在工作中，经常碰到XML转为JSON或者JSON转为XML，在这过程中有时嵌套很多层，容易错误，我把实现的代码分享出来，希望对有用到的人提供借鉴。

     

   1.把XML转为JSON格式

          

<span style="font-size:18px;">@SuppressWarnings("rawtypes")
    public static  String xmlToJSON(String xml,int jsonType) {
        JSONObject obj = new JSONObject();
        try {
            InputStream is = new ByteArrayInputStream(xml.getBytes("utf-8"));
            SAXBuilder sb = new SAXBuilder();
            Document doc = sb.build(is);
            Element root = doc.getRootElement();
            Map map=iterateElement(root);
           obj.put(root.getName(),map);
           return obj.toString();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }


@SuppressWarnings({ "unchecked", "rawtypes" })
    private static Map  iterateElement(Element root) {
        List childrenList = root.getChildren();
        Element element = null;
        Map map = new HashMap();
        List list = null;
        for (int i = 0; i < childrenList.size(); i++) {
            list = new ArrayList();
            element = (Element) childrenList.get(i);
            if(element.getChildren().size()>0){
                if(root.getChildren(element.getName()).size()>1){
                    if (map.containsKey(element.getName())) {
                        list = (List) map.get(element.getName());
                    }
                    list.add(iterateElement(element));
                    map.put(element.getName(), list);
                }else{
                    map.put(element.getName(), iterateElement(element));
                }
            }else {
                if(root.getChildren(element.getName()).size()>1){
                    if (map.containsKey(element.getName())) {
                        list = (List) map.get(element.getName());
                    }
                    list.add(element.getTextTrim());
                    map.put(element.getName(), list);
                }else{
                    map.put(element.getName(), element.getTextTrim());
                }
            }
        }

        return map;
    }



    public static void main(String[] args) throws ParseException
    {
        String xml="<ROOT>"+
        "<Status>00</Status>"+
        "<ErrorMsg></ErrorMsg>"+
        "<Data>"+
           "<Row>"+
              "<PERSONID>35020500200610000000000701355116</PERSONID>"+
              "<XM>吴聪楠</XM><SFZH>350624198908052530</SFZH>"+
           "</Row>"+
           "<Row>"+
              "<PERSONID>35020500200610000000000701355117</PERSONID>"+
              "<XM>吴聪楠2</XM><SFZH>350624198908052531</SFZH>"+
              "</Row>"+
          "</Data>"+
    "</ROOT>";


        String str=Xml2JsonUtil.xmlToJSON(xml,1);
      System.out.println(str);
}</span>

原来的格式：

    <ROOT><Status>00</Status><ErrorMsg></ErrorMsg><Data><Row><PERSONID>35020500200610000000000701355116</PERSONID><XM>吴聪楠</XM><SFZH>350624198908052530</SFZH></Row><Row><PERSONID>35020500200610000000000701355117</PERSONID><XM>吴聪楠2</XM><SFZH>350624198908052530</SFZH></Row></Data></ROOT>

转换完的格式：

   <span style="font-size:18px;">{"ROOT":{"Data":{"Row":[{"SFZH":"350624198908052530","XM":"吴聪楠","PERSONID":"35020500200610000000000701355116"},{"SFZH":"350624198908052530","XM":"吴聪楠2","PERSONID":"35020500200610000000000701355117"}]},"Status":"00","ErrorMsg":""}}</span>

  2.JSON 转换为XML格式

<span style="font-size:18px;">public static  String JsonToXml(Object json)
    {
        if(json==null){
            return null;
        }else{
         Element elements=new Element("xml");
         getXMLFromObject(json,"xml",elements);
         XMLOutputter xmlOut = new XMLOutputter();
         String res=xmlOut.outputString(elements);
         return res;
       }
    }


private static void getXMLFromObject(Object obj,String tag,Element parent)
    {
        if(obj==null)
            return;
        Element child;
        String eleStr;
        Object childValue;
        if(obj instanceof JSONObject)
        {
            JSONObject jsonObject=(JSONObject)obj;
            for(Object temp:jsonObject.keySet())
            {
                eleStr=temp.toString();
                childValue=jsonObject.get(temp);
                child=new Element(eleStr);
                if(childValue instanceof JSONArray)
                    getXMLFromObject(childValue,eleStr,parent,count);
                else{
                    parent.addContent(child);
                    getXMLFromObject(childValue,eleStr,child,count);
                }
            }
        }else if(obj instanceof JSONArray){
            JSONArray jsonArray=(JSONArray)obj;
            for(int i=0;i<jsonArray.size();i++)
            {
                childValue=jsonArray.get(i);
                child=new Element(tag);
                parent.addContent(child);
                getXMLFromObject(childValue,tag,child,count);
            }
        }else if(obj instanceof Date){
            SimpleDateFormat sf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            parent.setText(sf.format((Date)obj));
        }else{
            parent.setText(obj.toString());
        }
    }


public static void main(String[] args) throws ParseException
    {
  JSONObject rootObject=new JSONObject();

      JSONArray dataArray=new JSONArray();
      JSONObject dataObject1=new JSONObject();
      dataObject1.put("PERSONID", "35020500200610000000000701355117");
      dataObject1.put("XM", "吴聪楠");
      dataObject1.put("SFZH","350624198908052530");
      dataArray.add(dataObject1);
      JSONObject dataObject2=new JSONObject();
      dataObject2.put("PERSONID", "35020500200610000000000701355116");
      dataObject2.put("XM", "吴聪楠2");
      dataObject2.put("SFZH","350624198908052531");
      dataArray.add(dataObject2);

      JSONObject dataRootObject=new JSONObject();
      dataRootObject.put("Row", dataArray);
      JSONObject dataObject=new JSONObject();
      dataObject.put("Status", "00");
      dataObject.put("ErrorMsg", "");
      dataObject.put("Data",dataRootObject);
      rootObject.put("ROOT", dataObject);

      System.out.println(rootObject.toString());
      System.out.println(JsonToXml(rootObject));

    }</span>

  原来的格式：    

{"ROOT":{"Status":"00","ErrorMsg":"","Data":{"Row":[{"PERSONID":"35020500200610000000000701355117","XM":"吴聪楠","SFZH":"350624198908052530"},{"PERSONID":"35020500200610000000000701355116","XM":"吴聪楠2","SFZH":"350624198908052531"}]}}}

 

转换完的格式：

<ROOT><Status>00</Status><ErrorMsg></ErrorMsg><Data><Row><PERSONID>35020500200610000000000701355117</PERSONID><XM>吴聪楠</XM><SFZH>350624198908052530</SFZH></Row><Row><PERSONID>35020500200610000000000701355116</PERSONID><XM>吴聪楠2</XM><SFZH>350624198908052531</SFZH></Row></Data></ROOT>