Java读取多层级xml文件
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Java读取多层级xml文件
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最近在做國際客服北京職場的項目，需要提供一個接口服務端的能力，也就是需要開發一個http+xml的協議，入參和出參均為Map格式，各系統間的請求或應答是以xml格式封裝的。在將返回報文（xml）解析為Map輸出時遇到一個難點：Java對于多層級xml的解析。現以一個客戶資料查詢接口為例將解析過程記錄如下：
返回xml報文的簡化形式：
<?xml version="1.0" encoding="UTF-8"?> <ROOT><HEAD><ORIGIN_DOMAIN>kefuxitongbianma</ORIGIN_DOMAIN><HOME_DOMAIN>CUGCRM</HOME_DOMAIN><ACTION_CODE>1</ACTION_CODE><BUSI_CODE>QUERYCUST</BUSI_CODE><TRANS_ID>20160220160635123456</TRANS_ID><RET_CODE>0000</RET_CODE><RET_MSG>success</RET_MSG></HEAD><BODY><TOTAL_RECORDS>20</TOTAL_RECORDS><TOTAL_PAGE>10</TOTAL_PAGE><CURRENT_PAGE>1</CURRENT_PAGE><CUSTINFOLIST><CUSTINFO><CUST_TYPE>001</CUST_TYPE><VIP_FLAG>true</VIP_FLAG></CUSTINFO><CUSTINFO><CUST_TYPE>002</CUST_TYPE><VIP_FLAG>false</VIP_FLAG></CUSTINFO><CUSTINFO><CUST_TYPE>003</CUST_TYPE><VIP_FLAG>false</VIP_FLAG></CUSTINFO></CUSTINFOLIST></BODY> </ROOT>
import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Set; import net.sf.json.JSONObject; import org.apache.log4j.Logger; import org.dom4j.Document; import org.dom4j.DocumentException; import org.dom4j.DocumentHelper; import org.dom4j.Element; import org.dom4j.Namespace; import org.dom4j.QName; /*** 解析xml的工具類* 1、將多層級xml解析為Map* 2、將多層級xml解析為Json** @author lmb**/ public class ParseXmlUtil {public static Logger logger = Logger.getLogger(ParseXmlUtil.class);public static void main(String[] args) { // 獲取一個xml文件 String textFromFile = MyXmlUtil.XmlToString();//將xml解析為MapMap resultMap = xml2map(textFromFile);//將xml解析為JsonString resultJson = xml2Json(textFromFile);} /*** 將xml格式響應報文解析為Json格式* @param responseXmlTemp* @return*/public static String xml2Json(String responseXmlTemp) {Document doc = null;try {doc = DocumentHelper.parseText(responseXmlTemp);} catch (DocumentException e) {logger.error("parse text error : " + e);}Element rootElement = doc.getRootElement();Map<String,Object> mapXml = new HashMap<String,Object>();element2Map(mapXml,rootElement);String jsonXml = JSONObject.fromObject(mapXml).toString();System.out.println("Json >>> " + jsonXml);return jsonXml;}/*** 將xml格式響應報文解析為Map格式* @param responseXmlTemp* @param thirdXmlServiceBean* @return* @throws DocumentException*/public static Map<String, Object> xml2map(String responseXmlTemp) {Document doc = null;try {doc = DocumentHelper.parseText(responseXmlTemp);} catch (DocumentException e) {logger.error("parse text error : " + e);}Element rootElement = doc.getRootElement();Map<String,Object> mapXml = new HashMap<String,Object>();element2Map(mapXml,rootElement);System.out.println("Map >>> " + mapXml);return mapXml;}/*** 使用遞歸調用將多層級xml轉為map* @param map* @param rootElement*/public static void element2Map(Map<String, Object> map, Element rootElement) {//獲得當前節點的子節點List<Element> elements = rootElement.elements();if (elements.size() == 0) {//沒有子節點說明當前節點是葉子節點，直接取值map.put(rootElement.getName(),rootElement.getText());}else if (elements.size() == 1) {//只有一個子節點說明不用考慮list的情況，繼續遞歸Map<String,Object> tempMap = new HashMap<String,Object>();element2Map(tempMap,elements.get(0));map.put(rootElement.getName(),tempMap);}else {//多個子節點的話就要考慮list的情況了，特別是當多個子節點有名稱相同的字段時Map<String,Object> tempMap = new HashMap<String,Object>();for (Element element : elements) {tempMap.put(element.getName(),null);}Set<String> keySet = tempMap.keySet();for (String string : keySet) {Namespace namespace = elements.get(0).getNamespace();List<Element> sameElements = rootElement.elements(new QName(string,namespace));//如果同名的數目大于1則表示要構建listif (sameElements.size() > 1) {List<Map> list = new ArrayList<Map>();for(Element element : sameElements){Map<String,Object> sameTempMap = new HashMap<String,Object>();element2Map(sameTempMap,element);list.add(sameTempMap);}map.put(string,list);}else {//同名的數量不大于1直接遞歸Map<String,Object> sameTempMap = new HashMap<String,Object>();element2Map(sameTempMap,sameElements.get(0));map.put(string,sameTempMap);}}}} }
xml文件讀取工具類：
import java.io.File; import java.io.IOException; import java.io.StringWriter; import org.jdom.Document; import org.jdom.input.SAXBuilder; import org.jdom.output.Format; import org.jdom.output.XMLOutputter; /*** 讀取一個xml文件返回string* @author lmb **/ public class MyXmlUtil {/*** 加載xml文件* @return Document*/public static Document load(){Document document=null; String url="E://2.xml"; try { SAXBuilder reader = new SAXBuilder(); document=reader.build(new File(url)); } catch (Exception e) { e.printStackTrace(); } return document;}/*** 將xml文件轉換為String串* @return*/public static String XmlToString(){Document document=null; document=load(); Format format =Format.getPrettyFormat(); format.setEncoding("UTF-8");//設置編碼格式 StringWriter out=null; //輸出對象 String sReturn =""; //輸出字符串 XMLOutputter outputter =new XMLOutputter(); out=new StringWriter(); try { outputter.output(document,out); } catch (IOException e) { e.printStackTrace(); } sReturn=out.toString(); return sReturn; } }
控制臺打印結果：
Map >>> {BODY={TOTAL_RECORDS={TOTAL_RECORDS=20}, CUSTINFOLIST={CUSTINFO=[{CUST_TYPE={CUST_TYPE=001}, VIP_FLAG={VIP_FLAG=true}}, {CUST_TYPE={CUST_TYPE=002}, VIP_FLAG={VIP_FLAG=false}}, {CUST_TYPE={CUST_TYPE=003}, VIP_FLAG={VIP_FLAG=false}}]}, TOTAL_PAGE={TOTAL_PAGE=10}, CURRENT_PAGE={CURRENT_PAGE=1}}, HEAD={ACTION_CODE={ACTION_CODE=1}, ORIGIN_DOMAIN={ORIGIN_DOMAIN=kefuxit}, BUSI_CODE={BUSI_CODE=QUERYCUST}, HOME_DOMAIN={HOME_DOMAIN=CUGCRM}, TRANS_ID={TRANS_ID=20160220160635123456}, RET_MSG={RET_MSG=success}, RET_CODE={RET_CODE=0000}}}Json >>> {"BODY":{"TOTAL_RECORDS":{"TOTAL_RECORDS":"20"},"CUSTINFOLIST":{"CUSTINFO":[{"CUST_TYPE":{"CUST_TYPE":"001"},"VIP_FLAG":{"VIP_FLAG":"true"}},{"CUST_TYPE":{"CUST_TYPE":"002"},"VIP_FLAG":{"VIP_FLAG":"false"}},{"CUST_TYPE":{"CUST_TYPE":"003"},"VIP_FLAG":{"VIP_FLAG":"false"}}]},"TOTAL_PAGE":{"TOTAL_PAGE":"10"},"CURRENT_PAGE":{"CURRENT_PAGE":"1"}},"HEAD":{"ACTION_CODE":{"ACTION_CODE":"1"},"ORIGIN_DOMAIN":{"ORIGIN_DOMAIN":"kefuxit"},"BUSI_CODE":{"BUSI_CODE":"QUERYCUST"},"HOME_DOMAIN":{"HOME_DOMAIN":"CUGCRM"},"TRANS_ID":{"TRANS_ID":"20160220160635123456"},"RET_MSG":{"RET_MSG":"success"},"RET_CODE":{"RET_CODE":"0000"}}}
格式化之后的結果如下：
map : {BODY={TOTAL_RECORDS={TOTAL_RECORDS=20},CUSTINFOLIST={CUSTINFO=[{CUST_TYPE={CUST_TYPE=001},VIP_FLAG={VIP_FLAG=true}},{CUST_TYPE={CUST_TYPE=002},VIP_FLAG={VIP_FLAG=false}},{CUST_TYPE={CUST_TYPE=003},VIP_FLAG={VIP_FLAG=false}}]},TOTAL_PAGE={TOTAL_PAGE=10},CURRENT_PAGE={CURRENT_PAGE=1}},HEAD={ACTION_CODE={ACTION_CODE=1},ORIGIN_DOMAIN={ORIGIN_DOMAIN=kefuxit},BUSI_CODE={BUSI_CODE=QUERYCUST},HOME_DOMAIN={HOME_DOMAIN=CUGCRM},TRANS_ID={TRANS_ID=20160220160635123456},RET_MSG={RET_MSG=success},RET_CODE={RET_CODE=0000}} }Json: {"BODY":{"TOTAL_RECORDS":{"TOTAL_RECORDS":"20"},"CUSTINFOLIST":{"CUSTINFO":[{"CUST_TYPE":{"CUST_TYPE":"001"},"VIP_FLAG":{"VIP_FLAG":"true"}},{"CUST_TYPE":{"CUST_TYPE":"002"},"VIP_FLAG":{"VIP_FLAG":"false"}},{"CUST_TYPE":{"CUST_TYPE":"003"},"VIP_FLAG":{"VIP_FLAG":"false"}}]},"TOTAL_PAGE":{"TOTAL_PAGE":"10"},"CURRENT_PAGE":{"CURRENT_PAGE":"1"}},"HEAD":{"ACTION_CODE":{"ACTION_CODE":"1"},"ORIGIN_DOMAIN":{"ORIGIN_DOMAIN":"kefuxit"},"BUSI_CODE":{"BUSI_CODE":"QUERYCUST"},"HOME_DOMAIN":{"HOME_DOMAIN":"CUGCRM"},"TRANS_ID":{"TRANS_ID":"20160220160635123456"},"RET_MSG":{"RET_MSG":"success"},"RET_CODE":{"RET_CODE":"0000"}} }
返回xml報文的簡化形式：
<?xml version="1.0" encoding="UTF-8"?> <ROOT><HEAD><ORIGIN_DOMAIN>kefuxitongbianma</ORIGIN_DOMAIN><HOME_DOMAIN>CUGCRM</HOME_DOMAIN><ACTION_CODE>1</ACTION_CODE><BUSI_CODE>QUERYCUST</BUSI_CODE><TRANS_ID>20160220160635123456</TRANS_ID><RET_CODE>0000</RET_CODE><RET_MSG>success</RET_MSG></HEAD><BODY><TOTAL_RECORDS>20</TOTAL_RECORDS><TOTAL_PAGE>10</TOTAL_PAGE><CURRENT_PAGE>1</CURRENT_PAGE><CUSTINFOLIST><CUSTINFO><CUST_TYPE>001</CUST_TYPE><VIP_FLAG>true</VIP_FLAG></CUSTINFO><CUSTINFO><CUST_TYPE>002</CUST_TYPE><VIP_FLAG>false</VIP_FLAG></CUSTINFO><CUSTINFO><CUST_TYPE>003</CUST_TYPE><VIP_FLAG>false</VIP_FLAG></CUSTINFO></CUSTINFOLIST></BODY> </ROOT>
import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Set; import net.sf.json.JSONObject; import org.apache.log4j.Logger; import org.dom4j.Document; import org.dom4j.DocumentException; import org.dom4j.DocumentHelper; import org.dom4j.Element; import org.dom4j.Namespace; import org.dom4j.QName; /*** 解析xml的工具類* 1、將多層級xml解析為Map* 2、將多層級xml解析為Json** @author lmb**/ public class ParseXmlUtil {public static Logger logger = Logger.getLogger(ParseXmlUtil.class);public static void main(String[] args) { // 獲取一個xml文件 String textFromFile = MyXmlUtil.XmlToString();//將xml解析為MapMap resultMap = xml2map(textFromFile);//將xml解析為JsonString resultJson = xml2Json(textFromFile);} /*** 將xml格式響應報文解析為Json格式* @param responseXmlTemp* @return*/public static String xml2Json(String responseXmlTemp) {Document doc = null;try {doc = DocumentHelper.parseText(responseXmlTemp);} catch (DocumentException e) {logger.error("parse text error : " + e);}Element rootElement = doc.getRootElement();Map<String,Object> mapXml = new HashMap<String,Object>();element2Map(mapXml,rootElement);String jsonXml = JSONObject.fromObject(mapXml).toString();System.out.println("Json >>> " + jsonXml);return jsonXml;}/*** 將xml格式響應報文解析為Map格式* @param responseXmlTemp* @param thirdXmlServiceBean* @return* @throws DocumentException*/public static Map<String, Object> xml2map(String responseXmlTemp) {Document doc = null;try {doc = DocumentHelper.parseText(responseXmlTemp);} catch (DocumentException e) {logger.error("parse text error : " + e);}Element rootElement = doc.getRootElement();Map<String,Object> mapXml = new HashMap<String,Object>();element2Map(mapXml,rootElement);System.out.println("Map >>> " + mapXml);return mapXml;}/*** 使用遞歸調用將多層級xml轉為map* @param map* @param rootElement*/public static void element2Map(Map<String, Object> map, Element rootElement) {//獲得當前節點的子節點List<Element> elements = rootElement.elements();if (elements.size() == 0) {//沒有子節點說明當前節點是葉子節點，直接取值map.put(rootElement.getName(),rootElement.getText());}else if (elements.size() == 1) {//只有一個子節點說明不用考慮list的情況，繼續遞歸Map<String,Object> tempMap = new HashMap<String,Object>();element2Map(tempMap,elements.get(0));map.put(rootElement.getName(),tempMap);}else {//多個子節點的話就要考慮list的情況了，特別是當多個子節點有名稱相同的字段時Map<String,Object> tempMap = new HashMap<String,Object>();for (Element element : elements) {tempMap.put(element.getName(),null);}Set<String> keySet = tempMap.keySet();for (String string : keySet) {Namespace namespace = elements.get(0).getNamespace();List<Element> sameElements = rootElement.elements(new QName(string,namespace));//如果同名的數目大于1則表示要構建listif (sameElements.size() > 1) {List<Map> list = new ArrayList<Map>();for(Element element : sameElements){Map<String,Object> sameTempMap = new HashMap<String,Object>();element2Map(sameTempMap,element);list.add(sameTempMap);}map.put(string,list);}else {//同名的數量不大于1直接遞歸Map<String,Object> sameTempMap = new HashMap<String,Object>();element2Map(sameTempMap,sameElements.get(0));map.put(string,sameTempMap);}}}} }
xml文件讀取工具類：
import java.io.File; import java.io.IOException; import java.io.StringWriter; import org.jdom.Document; import org.jdom.input.SAXBuilder; import org.jdom.output.Format; import org.jdom.output.XMLOutputter; /*** 讀取一個xml文件返回string* @author lmb **/ public class MyXmlUtil {/*** 加載xml文件* @return Document*/public static Document load(){Document document=null; String url="E://2.xml"; try { SAXBuilder reader = new SAXBuilder(); document=reader.build(new File(url)); } catch (Exception e) { e.printStackTrace(); } return document;}/*** 將xml文件轉換為String串* @return*/public static String XmlToString(){Document document=null; document=load(); Format format =Format.getPrettyFormat(); format.setEncoding("UTF-8");//設置編碼格式 StringWriter out=null; //輸出對象 String sReturn =""; //輸出字符串 XMLOutputter outputter =new XMLOutputter(); out=new StringWriter(); try { outputter.output(document,out); } catch (IOException e) { e.printStackTrace(); } sReturn=out.toString(); return sReturn; } }
控制臺打印結果：
Map >>> {BODY={TOTAL_RECORDS={TOTAL_RECORDS=20}, CUSTINFOLIST={CUSTINFO=[{CUST_TYPE={CUST_TYPE=001}, VIP_FLAG={VIP_FLAG=true}}, {CUST_TYPE={CUST_TYPE=002}, VIP_FLAG={VIP_FLAG=false}}, {CUST_TYPE={CUST_TYPE=003}, VIP_FLAG={VIP_FLAG=false}}]}, TOTAL_PAGE={TOTAL_PAGE=10}, CURRENT_PAGE={CURRENT_PAGE=1}}, HEAD={ACTION_CODE={ACTION_CODE=1}, ORIGIN_DOMAIN={ORIGIN_DOMAIN=kefuxit}, BUSI_CODE={BUSI_CODE=QUERYCUST}, HOME_DOMAIN={HOME_DOMAIN=CUGCRM}, TRANS_ID={TRANS_ID=20160220160635123456}, RET_MSG={RET_MSG=success}, RET_CODE={RET_CODE=0000}}}Json >>> {"BODY":{"TOTAL_RECORDS":{"TOTAL_RECORDS":"20"},"CUSTINFOLIST":{"CUSTINFO":[{"CUST_TYPE":{"CUST_TYPE":"001"},"VIP_FLAG":{"VIP_FLAG":"true"}},{"CUST_TYPE":{"CUST_TYPE":"002"},"VIP_FLAG":{"VIP_FLAG":"false"}},{"CUST_TYPE":{"CUST_TYPE":"003"},"VIP_FLAG":{"VIP_FLAG":"false"}}]},"TOTAL_PAGE":{"TOTAL_PAGE":"10"},"CURRENT_PAGE":{"CURRENT_PAGE":"1"}},"HEAD":{"ACTION_CODE":{"ACTION_CODE":"1"},"ORIGIN_DOMAIN":{"ORIGIN_DOMAIN":"kefuxit"},"BUSI_CODE":{"BUSI_CODE":"QUERYCUST"},"HOME_DOMAIN":{"HOME_DOMAIN":"CUGCRM"},"TRANS_ID":{"TRANS_ID":"20160220160635123456"},"RET_MSG":{"RET_MSG":"success"},"RET_CODE":{"RET_CODE":"0000"}}}
格式化之后的結果如下：
map : {BODY={TOTAL_RECORDS={TOTAL_RECORDS=20},CUSTINFOLIST={CUSTINFO=[{CUST_TYPE={CUST_TYPE=001},VIP_FLAG={VIP_FLAG=true}},{CUST_TYPE={CUST_TYPE=002},VIP_FLAG={VIP_FLAG=false}},{CUST_TYPE={CUST_TYPE=003},VIP_FLAG={VIP_FLAG=false}}]},TOTAL_PAGE={TOTAL_PAGE=10},CURRENT_PAGE={CURRENT_PAGE=1}},HEAD={ACTION_CODE={ACTION_CODE=1},ORIGIN_DOMAIN={ORIGIN_DOMAIN=kefuxit},BUSI_CODE={BUSI_CODE=QUERYCUST},HOME_DOMAIN={HOME_DOMAIN=CUGCRM},TRANS_ID={TRANS_ID=20160220160635123456},RET_MSG={RET_MSG=success},RET_CODE={RET_CODE=0000}} }Json: {"BODY":{"TOTAL_RECORDS":{"TOTAL_RECORDS":"20"},"CUSTINFOLIST":{"CUSTINFO":[{"CUST_TYPE":{"CUST_TYPE":"001"},"VIP_FLAG":{"VIP_FLAG":"true"}},{"CUST_TYPE":{"CUST_TYPE":"002"},"VIP_FLAG":{"VIP_FLAG":"false"}},{"CUST_TYPE":{"CUST_TYPE":"003"},"VIP_FLAG":{"VIP_FLAG":"false"}}]},"TOTAL_PAGE":{"TOTAL_PAGE":"10"},"CURRENT_PAGE":{"CURRENT_PAGE":"1"}},"HEAD":{"ACTION_CODE":{"ACTION_CODE":"1"},"ORIGIN_DOMAIN":{"ORIGIN_DOMAIN":"kefuxit"},"BUSI_CODE":{"BUSI_CODE":"QUERYCUST"},"HOME_DOMAIN":{"HOME_DOMAIN":"CUGCRM"},"TRANS_ID":{"TRANS_ID":"20160220160635123456"},"RET_MSG":{"RET_MSG":"success"},"RET_CODE":{"RET_CODE":"0000"}} }
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