java xpath搜索文本

以下是XML文件的一部分。我需要找到一個與之相關聯的得分的所有節點和所有SimplePredicates導致每個分數產生規則集例子：java xpath搜索文本

if (GRAVH.1 <= 2751.5996775) && (WV.unity <= 93.567676535) && (Zagreb <= 74) 
{ 
score = 2.32 
}

是否有可能與Java的XPath 這裏做，這是XML文件..

</MiningSchema> 
     <Node id="1"> 
      <True/> 
      <Node id="2"> 
      <SimplePredicate field="GRAVH.1" operator="lessOrEqual" value="2751.5996775"/> 
      <Node id="4"> 
      <SimplePredicate field="WV.unity" operator="lessOrEqual" value="93.567676535"/> 
      <Node id="8"> 
      <SimplePredicate field="Zagreb" operator="lessOrEqual" value="74"/> 
      <Node id="16" score="2.32"> 
       <SimplePredicate field="VP.0" operator="lessOrEqual" value="6.047602111"/> 
      </Node> 
      <Node id="17"> 
       <SimplePredicate field="VP.0" operator="greaterThan" value="6.047602111"/> 
       <Node id="28" score="2.832"> 
       <SimplePredicate field="MOMI.Y" operator="lessOrEqual" value="838.9644494"/> 
       </Node> 
       <Node id="29" score="3.1075"> 
       <SimplePredicate field="MOMI.Y" operator="greaterThan" value="838.9644494"/> 
       </Node> 
      </Node> 
      </Node> 
      <Node id="9"> 
      <SimplePredicate field="Zagreb" operator="greaterThan" value="74"/> 
      <Node id="18" score="3.4"> 
       <SimplePredicate field="SP.0" operator="lessOrEqual" value="11.10848385"/> 
      </Node> 
      <Node id="19"> 
       <SimplePredicate field="SP.0" operator="greaterThan" value="11.10848385"/> 
       <Node id="30" score="3.81333333333333"> 
       <SimplePredicate field="MobCSA" operator="lessOrEqual" value="135.12"/> 
       </Node> 
       <Node id="31" score="4.04"> 
       <SimplePredicate field="MobCSA" operator="greaterThan" value="135.12"/> 
       </Node> 
      </Node> 
      </Node> 
      </Node> 
      <Node id="5"> 
      <SimplePredicate field="WV.unity" operator="greaterThan" value="93.567676535"/> 
      <Node id="10"> 
      <SimplePredicate field="VP.7" operator="lessOrEqual" value="0.583140169"/> 
      <Node id="20"> 
       <SimplePredicate field="apol" operator="lessOrEqual" value="50.9146355"/> 
       <Node id="32" score="4.48"> 
       <SimplePredicate field="MOMI.Z" operator="lessOrEqual" value="791.5388999"/> 
       </Node> 
       <Node id="33" score="4.848"> 
       <SimplePredicate field="MOMI.Z" operator="greaterThan" value="791.5388999"/> 
       </Node> 
      </Node> 
      <Node id="21" score="5.14"> 
       <SimplePredicate field="apol" operator="greaterThan" value="50.9146355"/> 
      </Node> 
      </Node> 
      <Node id="11"> 
      <SimplePredicate field="VP.7" operator="greaterThan" value="0.583140169"/> 
      <Node id="22"> 
       <SimplePredicate field="WPATH" operator="lessOrEqual" value="1502"/> 
       <Node id="34" score="5.638"> 
       <SimplePredicate field="WPATH" operator="lessOrEqual" value="1440.5"/> 
       </Node> 
       <Node id="35" score="5.45"> 
       <SimplePredicate field="WPATH" operator="greaterThan" value="1440.5"/> 
       </Node> 
      </Node> 
      <Node id="23" score="5.922"> 
       <SimplePredicate field="WPATH" operator="greaterThan" value="1502"/> 
      </Node> 
      </Node> 
      </Node> 
      </Node> 
      <Node id="3"> 
      <SimplePredicate field="GRAVH.1" operator="greaterThan" value="2751.5996775"/> 
      <Node id="6"> 
      <SimplePredicate field="ECCEN" operator="lessOrEqual" value="849"/> 
      <Node id="12"> 
      <SimplePredicate field="MOMI.Y" operator="lessOrEqual" value="8736.7661745"/> 
      <Node id="24" score="6.37"> 
       <SimplePredicate field="MOMI.R" operator="lessOrEqual" value="8.2680425545"/> 
      </Node> 
      <Node id="25" score="6.7925"> 
       <SimplePredicate field="MOMI.R" operator="greaterThan" value="8.2680425545"/> 
      </Node> 
      </Node> 
      <Node id="13" score="7.61"> 
      <SimplePredicate field="MOMI.Y" operator="greaterThan" value="8736.7661745"/> 
      </Node> 
      </Node> 
      <Node id="7"> 
      <SimplePredicate field="ECCEN" operator="greaterThan" value="849"/> 
      <Node id="14"> 
      <SimplePredicate field="WA.unity" operator="lessOrEqual" value="198.5991815"/> 
      <Node id="26" score="7.94"> 
       <SimplePredicate field="SP.3" operator="lessOrEqual" value="11.61334328"/> 
      </Node> 
      <Node id="27"> 
       <SimplePredicate field="SP.3" operator="greaterThan" value="11.61334328"/> 
       <Node id="36" score="8.75"> 
       <SimplePredicate field="MDEC.13" operator="lessOrEqual" value="6.9421166205"/> 
       </Node> 
       <Node id="37" score="8.42"> 
       <SimplePredicate field="MDEC.13" operator="greaterThan" value="6.9421166205"/> 
       </Node> 
      </Node> 
      </Node> 
      <Node id="15" score="9.408"> 
      <SimplePredicate field="WA.unity" operator="greaterThan" value="198.5991815"/> 
      </Node> 
      </Node> 
      </Node> 
     </Node> 
     </TreeModel> 
     </Segment> 
     <Segment id="3">

來源

2012-02-27 lochi

嘗試使用Google的'條件的XPath expression' – tom 2012-02-27 14:16:37

這個問題是相當不確定的：1.「XML」提供的是不是一個良好的XML文檔。沒有人說什麼應該是處理的結果。 ...請編輯問題並提供必要的信息以使其更有意義。如果不這樣做，可能會導致意想不到的效果，對您無用。 – 2012-02-27 17:54:40

這個想法是基於存儲在XML文件中的決策樹生成規則集（java源代碼）。該文件太大，無法附加（接近90000行） – lochi 2012-02-28 02:35:56

是這樣的嗎？

//node[@score]

來源

2012-02-27 14:16:07

你已經試過了什麼？這是你可以嘗試什麼：

與//Node[@id='16']/ancestor::Node
迭代讓您的節點的祖先在那個節點列表，並創建規則集，當你閱讀節點的屬性
得到最終的節點和檢索比分是
打印你所

這裏使用一個樣本只有標準的JDK，但你可能會使用類似發現：

public class SO9466408 { 
    private static final Map<String, String> OP = new HashMap<String, String>() {{ put("lessOrEqual", "<="); }}; 

    public static String attrValue(Node node, String attrName) { 
     return node.getAttributes().getNamedItem(attrName).getTextContent(); 
    } 

    public static void main(String[] args) throws XPathExpressionException { 
     final String id = "16"; 
     String score = null; 
     final StringBuilder ruleset = new StringBuilder("if ("); 
     // XML/XPath 
     final InputSource xmlInput = new InputSource(new URL("your file.xml").openStream()); 
     final XPath xpath = XPathFactory.newInstance().newXPath(); 
     // get the ancestors node 
     final XPathExpression expr = xpath.compile("//Node[@id='" + id + "']/ancestor::Node"); 
     final NodeList ancestors = (NodeList) expr.evaluate(xmlInput, XPathConstants.NODESET); 

     for (int i = 0; i < ancestors.getLength(); ++i) { 
      Node predicate = ancestors.item(i).getFirstChild(); 
      // get a new rule 
      if (predicate.getNodeName().equals("SimplePredicate")) { 
       ruleset.append(String.format("%s(%s %s %s)", i > 1 ? " && " : "", 
         attrValue(predicate, "field"), OP.get(attrValue(predicate, "operator")), attrValue(predicate, "value"))); 
      } 
      // retrieve the score on the last node 
      if (i == ancestors.getLength() - 1) { 
       score = attrValue((Node) xpath.compile("//Node[@id='" + id + "']").evaluate(ancestors.item(i), XPathConstants.NODE), "score"); 
      } 
     } 
     // show what we found 
     ruleset.append(") {\n\tscore = " + score + ";\n}"); 
     System.out.println(ruleset.toString()); 
    } 
} 

// Outputs: 
// if ((GRAVH.1 <= 2751.5996775) && (WV.unity <= 93.567676535) && (Zagreb <= 74)) 
// { 
//  score = 2.32 
// }

來源

2012-02-27 15:51:41 Alex

亞歷克斯，感謝您的答案。我會嘗試你的方法，並讓你知道它是怎麼回事.. – lochi 2012-02-28 02:36:36

java xpath搜索文本

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