xpath解析

来源：互联网发布：java 监听模式原理编辑：程序博客网时间：2024/04/30 06:57

之前解析xml用的都是dom4j来解析，最近学习了使用xpath来解析xml，下面附上代码：

public String parseXPath(String xml,Map<String,String> namespaceMap,String resExpression ) throws Exception{      final Map<String,String> namespaces = namespaceMap;    DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();  documentBuilderFactory.setNamespaceAware(true);  DocumentBuilder db = documentBuilderFactory.newDocumentBuilder();  InputSource is = new InputSource(new StringReader(xml));  Document restDom = db.parse(is);    XPath xPath = XPathFactory.newInstance().newXPath();  xPath.setNamespaceContext(new NamespaceContext() {@SuppressWarnings("rawtypes")public Iterator getPrefixes(String namespaceURI) {// TODO Auto-generated method stubreturn null;}public String getPrefix(String namespaceURI) {// TODO Auto-generated method stubreturn null;}public String getNamespaceURI(String prefix) {String namespace = namespaces.get(prefix);if(prefix == null || prefix.length() == 0){return XMLConstants.DEFAULT_NS_PREFIX;}else{return namespace;}}});    XPathExpression compile = xPath.compile(resExpression);    return compile.evaluate(restDom);  }

此处已将xml转为java字符串

String xml =   "<soapenv:Envelope xmlns:soapenv=\"http://schemas.xmlsoap.org/soap/envelope/\" " +  "xmlns:m56=\"http://10.29.26.34:80/PSIGW/PeopleSoftServiceListeningConnector/M562995.V1\">" +  "<soapenv:Header/>" +  "<soapenv:Body>" +  "<m56:Create__CompIntfc__WK_CI_USERPORFILE>" +  "<m56:OPRID>aaa@wku.edu.cn</m56:OPRID><!--登陆账号 Optional:--> " +  "<m56:OPRCLASS>HCPPALL</m56:OPRCLASS><!-- 必填，固定值 Optional:-->" +  "<m56:ROWSECCLASS>HCDPALL</m56:ROWSECCLASS><!-- 必填，固定值 Optional:--> " +  "<m56:OPERPSWD>1234</m56:OPERPSWD><!-- 密码 Optional:--> " +  "<m56:SYMBOLICID>SYSADM1</m56:SYMBOLICID><!-- 必填，固定值 Optional:--> " +  "<m56:LANGUAGE_CD>ENG</m56:LANGUAGE_CD><!-- 语言 Optional:--> " +  "<m56:CURRENCY_CD/> <!--Optional:--> " +  "<m56:ACCTLOCK>0</m56:ACCTLOCK><!-- PS中的是否锁定账户，不是必填 Optional:--> " +  "<m56:PRCSPRFLCLS>HCSPPRFL</m56:PRCSPRFLCLS><!-- 必填，固定值 Optional:--> " +  "<m56:DEFAULTNAVHP>HCSPNAVHP</m56:DEFAULTNAVHP><!-- 必填，固定值 Optional:--> " +  "<m56:EXPENT>0</m56:EXPENT><!--  PS中账号是否过期，默认值是0，不是必填 Optional:--> " +  "<m56:USERIDALIAS/> <!--Optional:--> " +  "<m56:PTALLOWSWITCHUSER/> <!--Optional:--> " +  "<m56:OPERPSWDCONF>1234</m56:OPERPSWDCONF><!--   密码确认  Optional:--> " +  "<m56:ROLEUSER_REASSIGN/> <!--Optional:--> " +  "<m56:ROLEUSER_ASSIGN_SW/> <!--Optional:--> " +  "<m56:NO_SYMBID_WARN/> <!--Optional:--> " +  "<m56:PSWDEXPIRED/> <!--Optional:--> " +  "<m56:MPDEFAULMP/> <!--Optional:--> " +  "<m56:SERVERNAME/> <!--Optional:--> " +  "<m56:WORKLIST_USER_SW/> <!--Optional:--> " +  "<m56:EMAIL_USER_SW/> <!--Optional:--> " +  "<m56:ROLEUSER_ALT/> <!--Optional:--> " +  "<m56:ROLEUSER_SUPR/> <!--Optional:--> " +  "<m56:EFFDT_FROM/> <!--Optional:--> " +  "<m56:EFFDT_TO/> <!--Zero or more repetitions:-->" +  "<m56:PSOPRALIAS><m56:OPRALIASTYPE>EMP</m56:OPRALIASTYPE><!--  添加的人员类型Zero or more repetitions:-->" +  "<m56:PSOPRALIASFIELD><!--Optional:-->" +  "<m56:ATTRVALUE>0870913</m56:ATTRVALUE><!-- 添加的人员的编码 -->" +  "</m56:PSOPRALIASFIELD>" +  "</m56:PSOPRALIAS> <!--Zero or more repetitions:--> " +  "<m56:PSOPTIONS><!--Optional:-->" +  "<m56:FROM_QUERY_RULE/><!--Optional:--><m56:FROM_DIR_RULE/>" +  "</m56:PSOPTIONS> <!--Zero or more repetitions:--> " +  "<m56:PSROLEUSER_VW>" +  "<m56:ROLENAME_1>PeopleSoft User</m56:ROLENAME_1><!-- 角色  -->" +  "</m56:PSROLEUSER_VW> <!--Zero or more repetitions:--> " +  "<m56:PSUSEROTHER_VW/>" +  "</m56:Create__CompIntfc__WK_CI_USERPORFILE>" +  "</soapenv:Body>" +  "</soapenv:Envelope>";

利用xpath取所需要节点的值：

String resExpression = "/soapenv:Envelope/soapenv:Body/m56:Create__CompIntfc__WK_CI_USERPORFILE/m56:PSROLEUSER_VW/m56:ROLENAME_1";  //String resExpression = "//m12:OPRID/text()";  XPathUtil httpU = new XPathUtil();  Map<String,String> namespaces = new HashMap<String,String>();  namespaces.put("soapenv", "http://schemas.xmlsoap.org/soap/envelope/");  namespaces.put("m56", "http://10.29.26.34:80/PSIGW/PeopleSoftServiceListeningConnector/M562995.V1");    System.out.println("Result is "+ httpU.parseXPath(xml,namespaces, resExpression));

但有的时候因为xml文本的不规范，会导致xpath按路径取不到所需要的值，这里我用了通配符来解决这个问题：

XML:

String xml =   "<OutputParameters xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns=\"http://xmlns.oracle.com/apps/ap/rest/MdmDataSynch/synch_company/\">"+  "<X_ORIG_SYSTEM_TASK_ID>41a2a3bb-bdf0-45a1-93f9-e2dc39915c6b</X_ORIG_SYSTEM_TASK_ID>"+  "<X_EBS_API_TASK_ID>4b77bcf0-d843-50b7-e054-0010e0765cec</X_EBS_API_TASK_ID>"+  "<X_RETURN_STATUS>S</X_RETURN_STATUS>"+  "<X_ERROR_MSG/>"+  "</OutputParameters>";

JAVA代码：

 String resExpression = "/*[name()='OutputParameters']/*[name()='X_RETURN_STATUS']/text()";

   System.out.println(resExpression);  XPathUtil httpU = new XPathUtil();  Map<String,String> namespaces = new HashMap<String,String>();    System.out.println("Result11 is "+ httpU.parseXPath(xml,namespaces, resExpression));

1 0