Java unmarshall xml元素

Question

我只是java的初學者。我有一個XML響應，follows.I要從響應

<result> 
<status>success</status> 
<function>get_list</function> 
<controlid>testControlId</controlid> 
<listtype start="0" end="9" total="3463">arpayment</listtype> 
<data> 
</data> 
</result> 

我需要開始，算上，總的元素提取元素。 我對這個 名單type.class兩類文件

import javax.xml.bind.annotation.XmlAttribute; 
    import javax.xml.bind.annotation.XmlValue; 

    public class Listtype 
    { 
    @XmlAttribute 
    public 
    Integer start; 
    @XmlAttribute 
    public 
    Integer end; 
    @XmlAttribute 
    public 
    Integer total; 
    @XmlValue 
    String value; 

Result.class 

    public class Result 
    { 
    @XmlElement 
    String status; 
    @XmlElement 
    String function; 
    @XmlElement 
    String controlid; 
    @XmlElement 
    public 
    Listtype listtype; 

這是我如何處理我的XML

String body = <XMLREQUEST> 
StringBuffer response = null; 
HttpURLConnection connection; 
Object endPoint = "https://XXXX.phtml"; 
URL obj = new URL((String) endPoint); 
connection = (HttpURLConnection) obj.openConnection(); 
//add request header 
connection.setRequestMethod("POST"); 
connection.setRequestProperty("Content-Type", "XML"); 
String urlParameters = body; 
System.out.println(urlParameters); 
connection.setDoOutput(true); 
DataOutputStream wr = new DataOutputStream(connection.getOutputStream()); 
wr.writeBytes(urlParameters); 
wr.flush(); 
wr.close(); 
if (connection.getResponseCode() != 200) { 
throw new RuntimeException("Failed : HTTP error code : " 
+ connection.getResponseCode()); 
} 
BufferedReader in = new BufferedReader(
new InputStreamReader(connection.getInputStream())); 
String inputLine; 
response = new StringBuffer(); 
while ((inputLine = in.readLine()) != null) { 
response.append(inputLine); 
} 
in.close(); 
Result r = JAXB.unmarshal(new StringReader(response.toString()), Result.class); 
System.out.println("\tListtype start: " + r.listtype.start); 
System.out.println("\tListtype end : " + r.listtype.end); 
System.out.println("\tListtype total: " + r.listtype.total); 

我如何在主開始，結束，總的元素值函數

Answer 1

您必須創建一個建模<result> XML標記的Java類，以及建模<listtype> XML標記的類。通常你註釋的Java類@XmlElement屬性，以表明它們是從XML標籤的值，可以使用@XmlAttribute，表明了Java屬性是XML標記的屬性：

class Listtype { 
    @XmlAttribute 
    Integer start; 
    @XmlAttribute 
    Integer end; 
    @XmlAttribute 
    Integer total; 
    @XmlValue 
    String value; 
} 

class Result { 
    @XmlElement 
    String status; 
    @XmlElement 
    String function; 
    @XmlElement 
    String controlid; 
    @XmlElement 
    Listtype listtype; 
} 

你可以使用JAXB類這樣的解組結果XML（這裏我以爲XML數據文件"result.txt"）：

// Unmarshal: 1 line only 
Result r = JAXB.unmarshal(new File("result.xml"), Result.class); 

// The rest is just printing it to the console: 
System.out.println("Status : " + r.status); 
System.out.println("Function : " + r.function); 
System.out.println("Controlid: " + r.controlid); 
System.out.println("Listtype : " + r.listtype.value); 
System.out.println("\tListtype start: " + r.listtype.start); 
System.out.println("\tListtype end : " + r.listtype.end); 
System.out.println("\tListtype total: " + r.listtype.total); 

輸出：

Status : success 
Function : get_list 
Controlid: testControlId 
Listtype : arpayment 
    Listtype start: 0 
    Listtype end : 9 
    Listtype total: 3463 

編輯：

String s = "<result>...</result>"; // XML content as a String 
// Unmarshal: 1 line only 
Result r = JAXB.unmarshal(new StringReader(s), Result.class); 

如果：

如果你的XML是存在於StringBuffer，StringBuilder或作爲String，你可以通過創建一個StringReader作爲源，而不是一個File解編它你可以用它的StringBuffer或StringBuilder命名爲sb，你可以使用它的toString()方法將它轉換成String方法：

Result r = JAXB.unmarshal(new StringReader(sb.toString()), Result.class);