使用vtd-xml解析xml文件
如何在java或C中使用vtd-xml解析如下所示的xml文件？
任何帮助，将不胜感激。
谢谢
我想其中一些取决于你想如何解析文件。
这是一个“非生产”的例子，它使用了一些有用的技术，包括：
- XPath选择（这里只使用“/ *”）
- 浏览所有兄弟节点
- 通过子节点向下看
- 使用AutoPilot将节点属性提取到地图中
希望能帮助到你
package scce; import com.ximpleware.AutoPilot; import com.ximpleware.NavException; import com.ximpleware.VTDGen; import com.ximpleware.VTDNav; import com.ximpleware.XPathEvalException; import com.ximpleware.XPathParseException; import java.io.File; import java.io.IOException; import java.util.LinkedHashMap; import java.util.Map; /** * * @author David */ public class VTDParserExample { VTDGen vg; VTDNav vn; public VTDParserExample() { vg = new VTDGen(); } public void parseAndPrint() throws NavException { int level = 0; for(boolean el = (vn != null); el == true ; el = vn.toElement(VTDNav.NEXT_SIBLING)) { printTag(vn, level); parseAndPrintChildren(level); } } private void parseAndPrintChildren(int level) throws NavException { vn.push(); for(boolean el = vn.toElement(VTDNav.FIRST_CHILD); el == true ; el = vn.toElement(VTDNav.NEXT_SIBLING)) { printTag(vn, level + 1); parseAndPrintChildren(level + 1); } vn.pop(); } public VTDNav loadFile(String filePath) throws IOException { File fDoc = new File(filePath); if (fDoc != null && fDoc.exists()) { System.out.println("loadFile file exists ["+filePath+"]"); vg.clear(); if (vg.parseFile(filePath, true)) { vn = vg.getNav(); } } else { throw new IOException("File ["+filePath+"] invalid"); } if (vn == null) { throw new IOException("Cannot parse file ["+filePath+"]"); } return vn; } public void getElementsByXpath() { AutoPilot ap = new AutoPilot(vn); try { String xpQ = "/*"; ap.selectXPath(xpQ); if (ap.evalXPathToBoolean()) { ap.evalXPath(); } else { System.out.println(this.getClass()+".getAllElements evalXPathToBoolean["+ap.evalXPathToBoolean()+"]"); } } catch(XPathParseException | XPathEvalException | NavException e) { e.printStackTrace(); } } private void loadAttributeMap(VTDNav nav, Mapamap) { nav.push(); try { AutoPilot apAtt = new AutoPilot(nav); apAtt.selectXPath("@*"); int j=-1; while ((j=apAtt.evalXPath())!=-1) { String name = nav.toString(j); String val = nav.toString(j+1); amap.put(name, val); } } catch(XPathParseException | XPathEvalException | NavException e) { e.printStackTrace(); } nav.pop(); } private void printTag(VTDNav vn, int level) throws NavException { String tag = vn.toString(vn.getCurrentIndex()); System.out.print("Level ["+level+"] Tag ["+tag+"]"); Mapamap = new LinkedHashMap(); loadAttributeMap(vn, amap); for (String aname: amap.keySet()) { String aval = amap.get(aname); System.out.print(" @"+aname+"="+aval); } System.out.print("\n"); } public static void main(String[] args) { VTDParserExample vp = new VTDParserExample(); try { vp.loadFile("src/scce/famedoro.xml"); vp.getElementsByXpath(); vp.parseAndPrint(); } catch (Exception ex) { ex.printStackTrace(); } } }
其中产生以下输出：
loadFile file exists [src/scce/famedoro.xml] Level [0] Tag [StockReport] Level [1] Tag [Article] @Code=027783012 @Height=35 @Width=36 @Length=136 @TotalPacks=4 @AvailablePacks=4 @StockReturnPacks=4 @BlockedPacks=0 @NextExpiryDate=2015-01-17 Level [2] Tag [Machine] @Number=1 @TotalPacks=4 @AvailablePacks=4 @StockReturnPacks=4 @BlockedPacks=0 @NextExpiryDate=2015-01-17 Level [1] Tag [Article] @Code=025349109 @Height=36 @Width=37 @Length=129 @TotalPacks=6 @AvailablePacks=6 @StockReturnPacks=6 @BlockedPacks=0 @NextExpiryDate=2015-01-17 Level [2] Tag [Machine] @Number=1 @TotalPacks=6 @AvailablePacks=6 @StockReturnPacks=6 @BlockedPacks=0 @NextExpiryDate=2015-01-17 Level [1] Tag [Article] @Code=039154327 @Height=0 @Width=0 @Length=0 @TotalPacks=0 @AvailablePacks=0 @StockReturnPacks=0 @BlockedPacks=0 @NextExpiryDate= Level [1] Tag [Article] @Code=932654167 @Height=57 @Width=99 @Length=137 @TotalPacks=27 @AvailablePacks=27 @StockReturnPacks=27 @BlockedPacks=0 @NextExpiryDate=2014-04-17 Level [2] Tag [Machine] @Number=1 @TotalPacks=16 @AvailablePacks=16 @StockReturnPacks=16 @BlockedPacks=0 @NextExpiryDate=2015-01-17 Level [2] Tag [Machine] @Number=2 @TotalPacks=11 @AvailablePacks=11 @StockReturnPacks=11 @BlockedPacks=0 @NextExpiryDate=2014-04-17
使用AutoPilot循环添加示例（而不是如上所述的纯粹基于节点）并不能很好地混合这些
package scce; import com.ximpleware.AutoPilot; import com.ximpleware.NavException; import com.ximpleware.VTDGen; import com.ximpleware.VTDNav; import com.ximpleware.XPathEvalException; import com.ximpleware.XPathParseException; import java.io.File; import java.io.IOException; import java.util.LinkedHashMap; import java.util.Map; import java.util.logging.Level; import java.util.logging.Logger; /** * * @author David */ public class VTDParserExample { VTDGen vg; VTDNav vn; AutoPilot ap; public VTDParserExample() { vg = new VTDGen(); } public void parseAndPrint() throws NavException { int level = 0; for(boolean el = (vn != null); el == true ; el = vn.toElement(VTDNav.NEXT_SIBLING)) { printTag(vn, level); parseAndPrintChildren(level); } } private void parseAndPrintChildren(int level) throws NavException { vn.push(); for(boolean el = vn.toElement(VTDNav.FIRST_CHILD); el == true ; el = vn.toElement(VTDNav.NEXT_SIBLING)) { printTag(vn, level + 1); parseAndPrintChildren(level + 1); } vn.pop(); } private VTDNav loadFile(String filePath) throws IOException { File fDoc = new File(filePath); if (fDoc != null && fDoc.exists()) { System.out.println("loadFile file exists ["+filePath+"]"); vg.clear(); if (vg.parseFile(filePath, true)) { vn = vg.getNav(); } } else { throw new IOException("File ["+filePath+"] invalid"); } if (vn == null) { throw new IOException("Cannot parse file ["+filePath+"]"); } return vn; } public boolean getElementsByXpath() { boolean found = false; ap = new AutoPilot(vn); try { String xpQ = "//Machine"; ap.selectXPath(xpQ); if (ap.evalXPathToBoolean()) { found = true; } else { System.out.println(this.getClass()+".getAllElements evalXPathToBoolean["+ap.evalXPathToBoolean()+"]"); } } catch(XPathParseException e) { e.printStackTrace(); } return found; } private void loadAttributeMap(VTDNav nav, Mapamap) { nav.push(); try { AutoPilot apAtt = new AutoPilot(nav); apAtt.selectXPath("@*"); int j=-1; while ((j=apAtt.evalXPath())!=-1) { String name = nav.toString(j); String val = nav.toString(j+1); amap.put(name, val); } } catch(XPathParseException | XPathEvalException | NavException e) { e.printStackTrace(); } nav.pop(); } private void printTag(VTDNav vn, int level) throws NavException { String tag = vn.toString(vn.getCurrentIndex()); System.out.print("Level ["+level+"] Tag ["+tag+"]"); Mapamap = new LinkedHashMap(); loadAttributeMap(vn, amap); for (String aname: amap.keySet()) { String aval = amap.get(aname); System.out.print(" @"+aname+"="+aval); } System.out.print("\n"); } public static void main(String[] args) { VTDParserExample vp = new VTDParserExample(); try { vp.loadFile("src/scce/famedoro.xml"); if (vp.getElementsByXpath()) { vp.parseAndPrintAP(); } } catch (Exception ex) { ex.printStackTrace(); } } private void parseAndPrintAP() { int level = 0; int result = -1; try { while((result = ap.evalXPath())!=-1){ printTag(vn, level); parseAndPrintChildren(level); } } catch (XPathEvalException | NavException ex) { ex.printStackTrace(); } } }
这 – 将不同的XPath设置为“// Machine”会产生：
loadFile file exists [src/scce/famedoro.xml] Level [0] Tag [Machine] @Number=1 @TotalPacks=4 @AvailablePacks=4 @StockReturnPacks=4 @BlockedPacks=0 @NextExpiryDate=2015-01-17 Level [0] Tag [Machine] @Number=1 @TotalPacks=6 @AvailablePacks=6 @StockReturnPacks=6 @BlockedPacks=0 @NextExpiryDate=2015-01-17 Level [0] Tag [Machine] @Number=1 @TotalPacks=16 @AvailablePacks=16 @StockReturnPacks=16 @BlockedPacks=0 @NextExpiryDate=2015-01-17 Level [0] Tag [Machine] @Number=2 @TotalPacks=11 @AvailablePacks=11 @StockReturnPacks=11 @BlockedPacks=0 @NextExpiryDate=2014-04-17