JAVA 读取XML实例

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<?xml version="1.0" encoding="UTF-8"?>
<roots>
<package name="src">
       <table id="qqqqqqqqqqq">
            <key name="key1">11111</key>
            <key name="key2">222222</key>
       </table>
       <table id="tblAPTRpt">
            <key name="key1">333333</key>
            <key name="key2">444444444</key>
            <key name="key3">5555555</key>
       </table>
</package>
</roots>

package primaryKey;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class PrimaryKeyReader {
public static List<String> GetPrimaryKeys(String tableName){
  List<String> lstString = new ArrayList<String>();
  try {

            File xmlFile = new File("src//primaryKey//primaryKeyFile.xml");

            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();//步骤1

            DocumentBuilder builder = factory.newDocumentBuilder();//步骤2

            Document doc = builder.parse(xmlFile);//步骤3

            NodeList nl = doc.getElementsByTagName("table");

            if(null!=nl){
            for (int i = 0; i < nl.getLength(); i++) {
              if(((Element)(nl.item(i))).getAttribute("id").equals(tableName)){
               Node tempNode= nl.item(i);
               NodeList nlTemp= tempNode.getChildNodes();
               for (int j = 0; j < nlTemp.getLength(); j++)
               {
                if(nlTemp.item(j) instanceof Element){

                 lstString.add(nlTemp.item(j).getTextContent());
                }
               }
              }
            }
            }

        } catch (Exception e) {

            e.printStackTrace();
        }

return lstString;
}
}

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