JAVA 实现XML与JSON 相互转换

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

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1. 1. 
      
2. <span style="font-size:18px;">@SuppressWarnings("rawtypes")  
3.     public static  String xmlToJSON(String xml,int jsonType) {  
4.         JSONObject obj = new JSONObject();  
5.         try {  
6.             InputStream is = new ByteArrayInputStream(xml.getBytes("utf-8"));  
7.             SAXBuilder sb = new SAXBuilder();  
8.             Document doc = sb.build(is);  
9.             Element root = doc.getRootElement();  
10.             Map map=iterateElement(root);  
11.            obj.put(root.getName(),map);  
12.            return obj.toString();  
13.         } catch (Exception e) {  
14.             e.printStackTrace();  
15.             return null;  
16.         }  
17.     }  
18. 
    
19. 
    
20. @SuppressWarnings({ "unchecked", "rawtypes" })  
21.     private static Map  iterateElement(Element root) {  
22.         List childrenList = root.getChildren();  
23.         Element element = null;  
24.         Map map = new HashMap();  
25.         List list = null;  
26.         for (int i = 0; i < childrenList.size(); i++) {  
27.             list = new ArrayList();  
28.             element = (Element) childrenList.get(i);  
29.             if(element.getChildren().size()>0){  
30.                 if(root.getChildren(element.getName()).size()>1){  
31.                     if (map.containsKey(element.getName())) {  
32.                         list = (List) map.get(element.getName());  
33.                     }  
34.                     list.add(iterateElement(element));  
35.                     map.put(element.getName(), list);  
36.                 }else{  
37.                     map.put(element.getName(), iterateElement(element));  
38.                 }  
39.             }else {  
40.                 if(root.getChildren(element.getName()).size()>1){  
41.                     if (map.containsKey(element.getName())) {  
42.                         list = (List) map.get(element.getName());  
43.                     }  
44.                     list.add(element.getTextTrim());  
45.                     map.put(element.getName(), list);  
46.                 }else{  
47.                     map.put(element.getName(), element.getTextTrim());  
48.                 }  
49.             }  
50.         }  
51. 
    
52.         return map;  
53.     }  
54. 
    
55. 
    
56. 
    
57.     public static void main(String[] args) throws ParseException  
58.     {         
59.         String xml="<ROOT>"+  
60.         "<Status>00</Status>"+  
61.         "<ErrorMsg></ErrorMsg>"+  
62.         "<Data>"+  
63.            "<Row>"+  
64.               "<PERSONID>35020500200610000000000701355116</PERSONID>"+  
65.               "<XM>吴聪楠</XM><SFZH>350624198908052530</SFZH>"+  
66.            "</Row>"+  
67.            "<Row>"+  
68.               "<PERSONID>35020500200610000000000701355117</PERSONID>"+  
69.               "<XM>吴聪楠2</XM><SFZH>350624198908052531</SFZH>"+  
70.               "</Row>"+  
71.           "</Data>"+  
72.     "</ROOT>";  
73. 
    
74. 
    
75.         String str=Xml2JsonUtil.xmlToJSON(xml,1);  
76.       System.out.println(str);  
77. }</span>  
    1. 
       

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

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1. 1. 
      
2. <span style="font-size:18px;">public static  String JsonToXml(Object json)   
3.     {  
4.         if(json==null){  
5.             return null;  
6.         }else{  
7.          Element elements=new Element("xml");  
8.          getXMLFromObject(json,"xml",elements);  
9.          XMLOutputter xmlOut = new XMLOutputter();    
10.          String res=xmlOut.outputString(elements);  
11.          return res;  
12.        }  
13.     }  
14. 
    
15. 
    
16. private static void getXMLFromObject(Object obj,String tag,Element parent)  
17.     {  
18.         if(obj==null)  
19.             return;  
20.         Element child;  
21.         String eleStr;  
22.         Object childValue;  
23.         if(obj instanceof JSONObject)  
24.         {  
25.             JSONObject jsonObject=(JSONObject)obj;  
26.             for(Object temp:jsonObject.keySet())  
27.             {  
28.                 eleStr=temp.toString();  
29.                 childValue=jsonObject.get(temp);  
30.                 child=new Element(eleStr);  
31.                 if(childValue instanceof JSONArray)  
32.                     getXMLFromObject(childValue,eleStr,parent,count);  
33.                 else{  
34.                     parent.addContent(child);  
35.                     getXMLFromObject(childValue,eleStr,child,count);  
36.                 }  
37.             }  
38.         }else if(obj instanceof JSONArray){  
39.             JSONArray jsonArray=(JSONArray)obj;  
40.             for(int i=0;i<jsonArray.size();i++)  
41.             {  
42.                 childValue=jsonArray.get(i);  
43.                 child=new Element(tag);  
44.                 parent.addContent(child);  
45.                 getXMLFromObject(childValue,tag,child,count);  
46.             }  
47.         }else if(obj instanceof Date){  
48.             SimpleDateFormat sf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");  
49.             parent.setText(sf.format((Date)obj));  
50.         }else{  
51.             parent.setText(obj.toString());  
52.         }  
53.     }  
54. 
    
55. 
    
56. public static void main(String[] args) throws ParseException  
57.     {  
58.   JSONObject rootObject=new JSONObject();  
59. 
    
60.       JSONArray dataArray=new JSONArray();  
61.       JSONObject dataObject1=new JSONObject();  
62.       dataObject1.put("PERSONID", "35020500200610000000000701355117");  
63.       dataObject1.put("XM", "吴聪楠");  
64.       dataObject1.put("SFZH","350624198908052530");  
65.       dataArray.add(dataObject1);  
66.       JSONObject dataObject2=new JSONObject();  
67.       dataObject2.put("PERSONID", "35020500200610000000000701355116");  
68.       dataObject2.put("XM", "吴聪楠2");  
69.       dataObject2.put("SFZH","350624198908052531");  
70.       dataArray.add(dataObject2);  
71. 
    
72.       JSONObject dataRootObject=new JSONObject();  
73.       dataRootObject.put("Row", dataArray);  
74.       JSONObject dataObject=new JSONObject();  
75.       dataObject.put("Status", "00");  
76.       dataObject.put("ErrorMsg", "");  
77.       dataObject.put("Data",dataRootObject);  
78.       rootObject.put("ROOT", dataObject);  
79. 
    
80.       System.out.println(rootObject.toString());  
81.       System.out.println(JsonToXml(rootObject));          
82. 
    
83.     }</span>  
    1. 
       

  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>