開篇：一般公司的專案，很多是返回xml報文，如何將xml解析為json，這裡採用一種方法，sax解析方式

一.maven 依賴

<dependency>
    <groupId>org.jdom</groupId>
   <artifactId>jdom2</artifactId>
   <version>2.0.6</version>
</dependency>
<dependency>
   <groupId>com.alibaba</groupId>
   <artifactId>
 
fastjson</artifactId>
   <version>1.2.46</version>
</dependency>

二.程式碼如下

public class TestXml2Json {
    public static void main(String[] args) throws JDOMException, IOException {
        String xml="<?xml version=\"1.0\" encoding=\"utf-8\" ?>" +
                "<MoBaoAccount MessageType=
 
\"UserMobilePay\" PlatformID=\"b2ctest\">" +
                "<OrderNo>M20150521084825</OrderNo>" +
                "<TradeAmt>5000.00</TradeAmt>" +
                "<Commission>0.5</Commission>" +
                "<UserID>zhangbingfa</UserID>" +
                "<MerchID>zhangbingfa</MerchID>" 
 
+
                "<tradeType>0</tradeType>" +
                "<CustParam>123</CustParam> " +
                "</MoBaoAccount>";
//解析xml文件
JSONObject json=xml2Json(xml.getBytes());
//解析json資料
JSONObject moBaoAccount = (JSONObject) json.get("MoBaoAccount");
List commission = (List) moBaoAccount.get("Commission");
Order order = new Order();
//封裝為自定義物件
order.setCommission((String) commission.get(0));
System.out.println(order.getOrderNo()+">>>>>>>>>"+order.getCommission()+">>>>>>>"+order.getTradeAmt());
System.out.println(json.toJSONString());
}

    public static JSONObject xml2Json(byte[] xml) throws JDOMException, IOException {
        JSONObject jsonObject = new JSONObject();
//將字串轉換為輸入流
InputStream is = new ByteArrayInputStream(xml);
//用sax解析，解析一行丟一行
SAXBuilder saxBuilder = new SAXBuilder();
//獲得xml文件
Document document = saxBuilder.build(is);
//獲得根元素，例如xml
Element rootElement = document.getRootElement();
//呼叫具體解析方法
jsonObject.put(rootElement.getName(),iterateElement(rootElement));
        return jsonObject;
}

    private static JSONObject iterateElement(Element rootElement) {
        //獲得所有子元素的集合
List note = rootElement.getChildren();
Element et;
JSONObject jsonObject = new JSONObject();
List list;
        for(int i=0;i<note.size();i++){
            list = new LinkedList();
et = (Element) note.get(i);
//此處是從>解析到<，如果有巢狀的子節點，則遞迴遍歷
if(et.getTextTrim().equals("")){
                if(et.getChildren().size() == 0) continue;
//有這個鍵，則用最新的值替換
if(jsonObject.containsKey(et.getName())){
                    list = (List)jsonObject.get(et.getName());
}
                list.add(iterateElement(et));
jsonObject.put(et.getName(),list);
}else{
                if(jsonObject.containsKey(et.getName())){
                    list = (List)jsonObject.get(et.getName());
}
                //獲得值，例如<a>1</a>,得到1
list.add(et.getTextTrim());
jsonObject.put(et.getName(),list);
}
        }
        return jsonObject;
}
}
class Order{
    private String OrderNo;
    private String TradeAmt;
    private String Commission;
    public String getOrderNo() {
        return OrderNo;
}

    public void setOrderNo(String orderNo) {
        OrderNo = orderNo;
}

    public String getTradeAmt() {
        return TradeAmt;
}

    public void setTradeAmt(String tradeAmt) {
        TradeAmt = tradeAmt;
}

    public String getCommission() {
        return Commission;
}

    public void setCommission(String commission) {
        Commission = commission;
}
}

三，結果如下

{
"MoBaoAccount": {
"MerchID": ["zhangbingfa"],
"UserID": ["zhangbingfa"],
"Commission": ["0.5"],
"OrderNo": ["M2015052198456"],
"TradeAmt": ["5000.00"],
"CustParam": ["321"],
"tradeType": ["0"]
}

}