利用dom4j解析xml

需求：得到xml中某些節點的key和value，轉爲java中的map。
先將xml轉爲dom4j中的document類，接着主要是運用XPath來選取節點。

情況一：
取xml文件中listUserInfoResp節點中的key和value

<?xml version="1.0" encoding="utf-8"?>

<response>
  <errno>0</errno>
  <errmsg/>
  <erraction/>
  <listUserInfoResp>
    <strName/>
    <strAddr/>
    <strTel/>
    <strEmail/>
    <strID/>
    <strAccounts>[email protected]</strAccounts>
    <strRemark/>
    <strUserType>1</strUserType>
    <strUserCreateTime>14622131312</strUserCreateTime>
    <strMaxDownRate/>
    <strMaxUpRate/>
    <strUserID>AA0216180813815</strUserID>
    <strUserPass/>
    <strCardNo/>
    <strCardKey/>
    <strStratGrpdl>02</strStratGrpdl>
  </listUserInfoResp>
</response>

解析：

public Map<String, String> mockUserInfo(){
        Map<String, String> userInfo = new HashMap<String, String>();
        String xml = "<?xml version=\"1.0\" encoding=\"utf-8\"?><response><errno>0</errno><errmsg/><erraction/><listUserInfoResp><strName/><strAddr/><strTel/><strEmail/><strID/><strAccounts>[email protected]</strAccounts><strRemark/><strUserType>1</strUserType><strUserCreateTime>1462961323</strUserCreateTime><strMaxDownRate/><strMaxUpRate/><strUserID>AA0216180813815</strUserID><strUserPass/><strCardNo/><strCardKey/><strStratGrpdl>02</strStratGrpdl></listUserInfoResp></response>";
        try {
            Document doc = DocumentHelper.parseText(xml);

            Node nodes = doc.selectSingleNode("//listUserInfoResp");

            List<Element> userInfoList = ((Element) nodes).elements();

            for(int i = 0; i < userInfoList.size(); i ++){
                userInfo.put(userInfoList.get(i).getName(), userInfoList.get(i).getStringValue());
                System.out.println(userInfoList.get(i).getName() + ": " + userInfoList.get(i).getStringValue());
            }

            return userInfo;


        } catch (DocumentException e) {
            e.printStackTrace();
        } 

        return null;
}

情況二：
取xml中listServiceInfoResp的strName和iStatus的內容，組成map

<?xml version="1.0" encoding="utf-8"?>

<response>
  <errno>0</errno>
  <errmsg/>
  <erraction/>
  <listServiceInfoResps>
    <listServiceInfoResp>
      <strName>csej</strName>
      <iStatus>0</iStatus>
      <iOpenTime/>
    </listServiceInfoResp>
    <listServiceInfoResp>
      <strName>dband</strName>
      <iStatus>0</iStatus>
      <iOpenTime/>
    </listServiceInfoResp>
    <listServiceInfoResp>
      <strName>iad</strName>
      <iStatus>0</iStatus>
      <iOpenTime/>
    </listServiceInfoResp>
    <listServiceInfoResp>
      <strName>iptv</strName>
      <iStatus>0</iStatus>
      <iOpenTime/>
    </listServiceInfoResp>
    <listServiceInfoResp>
      <strName>pbx</strName>
      <iStatus>0</iStatus>
      <iOpenTime/>
    </listServiceInfoResp>
    <listServiceInfoResp>
      <strName>voip</strName>
      <iStatus>1</iStatus>
      <iOpenTime/>
    </listServiceInfoResp>
    <listServiceInfoResp>
      <strName>wband</strName>
      <iStatus>1</iStatus>
      <iOpenTime/>
    </listServiceInfoResp>
    <listServiceInfoResp>
      <strName>wifi</strName>
      <iStatus>0</iStatus>
      <iOpenTime/>
    </listServiceInfoResp>
  </listServiceInfoResps>
</response>

解析：

public Map<String, String> mockBussinessList(){
        Map<String, String> bussinessList = new HashMap<String, String>();
        try {
            String xml = "<?xml version=\"1.0\" encoding=\"utf-8\"?><response><errno>0</errno><errmsg/><erraction/><listServiceInfoResps><listServiceInfoResp><strName>csej</strName><iStatus>0</iStatus><iOpenTime/></listServiceInfoResp><listServiceInfoResp><strName>dband</strName><iStatus>0</iStatus><iOpenTime/></listServiceInfoResp><listServiceInfoResp><strName>iad</strName><iStatus>0</iStatus><iOpenTime/></listServiceInfoResp><listServiceInfoResp><strName>iptv</strName><iStatus>0</iStatus><iOpenTime/></listServiceInfoResp><listServiceInfoResp><strName>pbx</strName><iStatus>0</iStatus><iOpenTime/></listServiceInfoResp><listServiceInfoResp><strName>voip</strName><iStatus>1</iStatus><iOpenTime/></listServiceInfoResp><listServiceInfoResp><strName>wband</strName><iStatus>1</iStatus><iOpenTime/></listServiceInfoResp><listServiceInfoResp><strName>wifi</strName><iStatus>0</iStatus><iOpenTime/></listServiceInfoResp></listServiceInfoResps></response>";

            Document doc = DocumentHelper.parseText(xml);

            List<Node> names = doc.selectNodes("//strName");
            List<Node> values = doc.selectNodes("//iStatus");

            for(int i = 0; i < names.size(); i ++){
                bussinessList.put(names.get(i).getStringValue(), values.get(i).getStringValue());
                System.out.println(names.get(i).getStringValue() + ": " + values.get(i).getStringValue());
            }

        } catch (DocumentException e) {
            e.printStackTrace();
        }

        return bussinessList;
}

利用dom4j中DocumentHelper的parseText方法將xml轉爲dom4j中的Document類，進而進行解析。

selectSingleNode和selectNode兩種方法的區別，查看上述兩種xml可知。