最近在项目中遇到需要解析XSD的情况，在上网搜索很久发现几乎没有这方面的信息，于是只好自己实现。
先说下具体要求：
1、用JAVA解析XSD，找出所有数据节点(xs:element),生成该节点的XPath
2、在解析出的节点中随便选择几个节点作为要保留的节点
3、根据需要保留的节点信息生成XSLT
这样可以实现这样的业务：首先制定好某一个业务需要的XSD规范，然后从规范中选择针对某个业务需要关心的节点生成XSLT，那么，以后满足这个XSD规范的所有xml文档，都可以由这个生成的XSLT来转换得到我们说关心的那些数据的一个XML文档。
具体实现如下,这个只是我自己用dom4j来实现的一种方式，如果有更好的方法或者建议，希望指正。
1.XSDNode定义
public class XSDNode {
// 节点名称
private String name;
// 节点XPath
private String xPath;
// 节点描述
private String annotation;
// 节点类型
private String type;
// 业务用路径,描述路径中的unbound节点
private String unboundedXpath;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getXPath() {
return xPath;
}
public void setXPath(String path) {
xPath = path;
}
public String getAnnotation() {
return annotation;
}
public void setAnnotation(String annotation) {
this.annotation = annotation;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getUnboundedXpath() {
return unboundedXpath;
}
public void setUnboundedXpath(String unboundedXpath) {
this.unboundedXpath = unboundedXpath;
}
}
2.XSD文件解析
public class XSDReader {
private List<XSDNode> list = new ArrayList<XSDNode>();
/**
* 解析XSD，返回数据节点对象列表
*
* @param xsd
* @return
* @throws Exception
*/
public List<XSDNode> paserXSD(String xsd) throws Exception {
SAXReader saxReader = new SAXReader();
// ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(xsd.getBytes(BaseConstants.XMLENCODING));
Document doc = saxReader.read(xsd);
Element element = doc.getRootElement();
String basePath = "//" + XMLConstants.XSD_DEFAULT_NAMESPACE + ":element[@name=\"" + XMLConstants.MESSAGE + "\"]";
Element dataElement = (Element) element.selectSingleNode(basePath);
String elementPath = "//" + XMLConstants.XSD_DEFAULT_NAMESPACE + ":element";
paseData(dataElement, "//", elementPath, "//");
return list;
}
/**
* 转换XSD的数据节点，生成XSDNode对象
*
* @param element
* @param xPath
* @param xsdPath
* @param unboundedXpath
*/
public void paseData(Element element, String xPath, String xsdPath, String unboundedXpath) {
// 获取节点name属性
String nodeName = element.attributeValue("name");
// 组装xml文档中节点的XPath
xPath += nodeName;
unboundedXpath += nodeName;
// 并列多节点限制属性
String maxOccurs = element.attributeValue("maxOccurs");
if (maxOccurs != null && !"1".equals(maxOccurs) && !("//" + XMLConstants.MESSAGE + "").equals(xPath)) {// 节点可以有多个
unboundedXpath += XMLConstants.XSD_UNBOUNDED;
}
// 组装下一个element元素的XPath
String currentXsdPath = xsdPath + "[@name=\"" + nodeName + "\"]" + "/" + XMLConstants.XSD_DEFAULT_NAMESPACE
+ ":complexType/" + XMLConstants.XSD_DEFAULT_NAMESPACE + ":sequence/" + XMLConstants.XSD_DEFAULT_NAMESPACE
+ ":element";
// 查找该节点下所有的element元素
List<Node> elementNodes = element.selectNodes(currentXsdPath);
if (elementNodes != null && elementNodes.size() > 0) {// 如果下面还有element,说明不是叶子
Iterator<Node> nodes = elementNodes.iterator();
while (nodes.hasNext()) {
if (!xPath.endsWith("/")) {
xPath += "/";
unboundedXpath += "/";
}
Element ele = (Element) nodes.next();
paseData(ele, xPath, currentXsdPath, unboundedXpath);
}
} else { // 该element为叶子
XSDNode xsdNode = new XSDNode();
// 获取注释节点
String annotation = "";
Node annotationNode = element
.selectSingleNode(xsdPath + "[@name=\"" + nodeName + "\"]/" + XMLConstants.XSD_DEFAULT_NAMESPACE
+ ":annotation/" + XMLConstants.XSD_DEFAULT_NAMESPACE + ":documentation");
if (annotationNode != null)
annotation = annotationNode.getText();
// 获取节点类型属性
String nodeType = "";
Attribute type = element.attribute("type");
if (type != null)
nodeType = type.getText();
else {
String spath = xsdPath + "[@name=\"" + nodeName + "\"]/" + XMLConstants.XSD_DEFAULT_NAMESPACE + ":simpleType/"
+ XMLConstants.XSD_DEFAULT_NAMESPACE + ":restriction";
Element typeNode = (Element) element.selectSingleNode(spath);
if (typeNode != null) {
Attribute base = typeNode.attribute("base");
if (base != null)
nodeType = base.getText();
}
}
xsdNode.setName(nodeName);
xsdNode.setXPath(xPath);
xsdNode.setAnnotation(annotation);
xsdNode.setType(nodeType);
xsdNode.setUnboundedXpath(unboundedXpath);
list.add(xsdNode);
}
}
public static void main(String[] args) {
try {
List<XSDNode> nodes = paserXSD("F:/1.xsd");
for (XSDNode node : nodes) {
System.out.println(node.getUnboundedXpath());
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
3.根据XPath生成XSLT
public class XSLCreator {
/**
* <p>
* 根据传入的XPath信息生成XSLT
* Xpath路径类似//MESSAGE/BASEINFO/INFO_SOURCE/infoRegionLimitList[unbounded]/Region[unbounded]/china/jobProvince[unbounded]
* 多个路径以","分隔[unbounded]标记路径中的unbounded节点
* </p>
*
* @param paths
* @return
* @throws Exception
*/
public String createXSL(String paths) throws Exception {
// 解析传入的Xpath
String[] xPathsArr = paths.split(",");
// 生成根节点,并创建XSLT基本信息
String rootElement = XMLConstants.MESSAGE;
Document documents = DocumentHelper.createDocument();
Element documentsRoot = documents.addElement(XMLConstants.NAMESPACE + XMLConstants.SPER + XMLConstants.STYLESHEET)
.addAttribute(XMLConstants.VERSION, XMLConstants.VERSIONNUM);
documentsRoot.add(new Namespace(XMLConstants.NAMESPACE, XMLConstants.NAMESPACEADDRESS));
Element elementTemplate = documentsRoot.addElement(XMLConstants.NAMESPACE + XMLConstants.SPER + XMLConstants.TEMPLATE);
elementTemplate.addAttribute(XMLConstants.MATCH, XMLConstants.ROOTSPER);
Element root = elementTemplate.addElement(rootElement);
root.addElement(XMLConstants.NAMESPACE + XMLConstants.SPER + XMLConstants.APPLYTEMPLATES).addAttribute(
XMLConstants.SELECT, rootElement);
// 创建节点模板
Element elementTemplateChild = documentsRoot.addElement(XMLConstants.NAMESPACE + XMLConstants.SPER
+ XMLConstants.TEMPLATE);
elementTemplateChild.addAttribute(XMLConstants.MATCH, rootElement);
// 生成各个节点转换模板
for (String xPath : xPathsArr) {
// 记录同一路径下unbound节点的个数
int unbounds = 0;
String[] unboundPathSplit = xPath.split(XMLConstants.XSD_UNBOUNDED_REPLATE);
Element ele = elementTemplateChild;
// 获取Message后各级节点名称
String[] nodes = xPath.split("/");
// 标记节点是否为unbound节点
boolean isUnbound = false;
// 标记改路径下的循环节点个数
for (int i = 0; i < nodes.length; i++) {
String node = nodes[i];
if (node.endsWith(XMLConstants.XSD_UNBOUNDED)) {// 如果含有unbound标识,该节点为unbound节点
node = node.replaceAll(XMLConstants.XSD_UNBOUNDED_REPLATE, "");
isUnbound = true;
unbounds++; // 将同一路径下的unbound节点数加1
} else
isUnbound = false;
if (node != null && !node.equals("")) {
// 先判断节点下有没有循环,如果有循环,跳过循环节点
Element each = ele.element(XMLConstants.XSL_ELEMENT_FOREACH);
if (each != null)
ele = each;
if (ele.element(node) == null) {// 如果没有该节点,创建一个节点作为当前节点
//判断当前节点是否为for-each,如果是,一直找到不为for-each的父亲节点
while (ele.getName().equals(XMLConstants.XSL_ELEMENT_FOREACH))
ele = ele.getParent();
if (isUnbound) {// 如果该节点为unbound节点则创建xsl:for-each节点
// 生成一个for-each节点
ele = ele.addElement(XMLConstants.NAMESPACE + XMLConstants.SPER + XMLConstants.XSL_ELEMENT_FOREACH);
// 获取对应的selectPath
String selectPath = unboundPathSplit[unbounds - 1];
// 去除中间路径中开始的"/"标记,否则XSL会不合法,判断unbounds不等于1是因为第一个路径是由"//"开始,故需要排除
if (unbounds != 1 && selectPath.startsWith("/"))
selectPath = selectPath.substring(1, selectPath.length());
// 为for-each节点添加select属性
ele.addAttribute(XMLConstants.XSL_ELEMENT_SELECT, selectPath);
}
ele = ele.addElement(node);
} else
// 如果已经有该节点,获取节点作为当前节点
ele = ele.element(node);
}
if (i == nodes.length - 1) {// 如果当前节点为叶子节点,则为叶子节点选择数据
if (unbounds != 0) {// 如果当前路径中存储unbound节点情况,取split后数组最后一位
if (unbounds == unboundPathSplit.length)// 如果叶子节点也是unbound节点,for-each里面的select路径用"."表示
xPath = "."; // 选择当前节点数据
else {
xPath = unboundPathSplit[unbounds];
if (!"".equals(xPath) && xPath.startsWith("/"))
xPath = xPath.substring(1, xPath.length());
}
}
ele.addElement(XMLConstants.NAMESPACE + XMLConstants.SPER + XMLConstants.VALUEOF).addAttribute(
XMLConstants.SELECT, xPath);
}
}
}
documents.setXMLEncoding(XMLConstants.XMLENCODING);
return documents.asXML();
}
public static void main(String[] args) {
try {
String unboundPath = "//MESSAGE/BASEINFO/CDB_INFO/infoStatus,"
+ "//MESSAGE/BASEINFO/INFO_SOURCE/infoRegionLimitList[unbounded]/Region[unbounded]/china[unbounded]/jobProvince[unbounded],"
+ "//MESSAGE/BASEINFO/INFO_SOURCE/infoRegionLimitList[unbounded]/Region[unbounded]/china[unbounded]/jobCity[unbounded],"
+ "//MESSAGE/BASEINFO/INFO_SOURCE/infoRegionLimitList[unbounded]/Region[unbounded]/china[unbounded]/jobCunty[unbounded],"
+ "//MESSAGE/BASEINFO/INFO_SOURCE/cpPrimaryKey," + "//MESSAGE/BASEINFO/INFO_SOURCE/cpCreateDate,"
+ "//MESSAGE/BASEINFO/INFO_SOURCE/cpUpdateDate";
String result = createXSL(unboundPath);
System.out.println(result);
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
4、相关常量定义
public class XMLConstants {
// 默认数据节点
public static final String MESSAGE = "MESSAGE";
// xml编码
public static final String ENCODING = "UTF-8";
// xsd默认命名空间
public static final String XSD_DEFAULT_NAMESPACE = "xs";
// xsd定义的默认数据节点
public static final String XSD_DEFAULT_DATANODE = "MESSAGE";
// xsd复合类型节点
public static final String XSD_COMPLEX_TYPE = "complexType";
// xsd序列节点
public static final String XSD_SEQUENCE = "sequence";
// xsd元素节点
public static final String XSD_ELEMENT = "element";
// xsd注解节点
public static final String XSD_ANNOTATION = "annotation";
// xsd注解文档节点
public static final String XSD_DOCUMENTATION = "documentation";
// xsd简单类型节点
public static final String XSD_SIMPLE_TYPE = "simpleType";
// xsd限制节点
public static final String XSD_RESTRICTION = "restriction";
// xsd name属性
public static final String XSD_ATTRIBUTE_NAME = "name";
// xsd type属性
public static final String XSD_ATTRIBUTE_TYPE = "type";
// xsd base属性
public static final String XSD_ATTRIBUTE_base = "base";
// 用来描述xsd中的unbounded节点信息
public static final String XSD_UNBOUNDED = "[unbounded]";
public static final String XSD_UNBOUNDED_REPLATE = "\\[unbounded\\]";
public static final String XSL_ELEMENT_FOREACH = "for-each";
public static final String XSL_ELEMENT_SELECT = "select";
/** ************* 创建xslt基础变量配置 ******************* */
public static final String STYLESHEET = "stylesheet";
public static final String VERSION = "version";
public static final String VERSIONNUM = "1.0";
public static final String NAMESPACE = "xsl";
public static final String NAMESPACEADDRESS = "http://www.w3.org/1999/XSL/Transform";
public static final String TEMPLATE = "template";
public static final String MATCH = "match";
public static final String APPLYTEMPLATES = "apply-templates";
public static final String VALUEOF = "value-of";
public static final String SELECT = "select";
public static final String XMLENCODING = "UTF-8";
public static final String ROOTSPER = "/";
public static final String DOUBELROOTSPER = "//";
public static final String SPER = ":";
}
所有代码如上，需要用的dom4j相关包。如果有问题和建议，请联系我,mail:feihu8620@gmail.com,QQ76615834
======================================================
修改XSDReader，使之适应XSD choise节点
======================================================
import java.io.ByteArrayInputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.Node;
import org.dom4j.io.SAXReader;
import com.feinno.cdb.commons.BaseConstants;
import com.feinno.cdb.commons.XMLConstants;
import com.feinno.cdb.po.XSDNode;
public class XSDReader {
private List<XSDNode> list = new ArrayList<XSDNode>();
/**
* 解析XSD，返回数据节点对象列表
*
* @param xsd
* @return
* @throws Exception
*/
public List<XSDNode> paserXSD(String xsd) throws Exception {
SAXReader saxReader = new SAXReader();
ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(xsd.getBytes(BaseConstants.XMLENCODING));
Document doc = saxReader.read(byteArrayInputStream);
Element element = doc.getRootElement();
String basePath = "//" + XMLConstants.XSD_DEFAULT_NAMESPACE + ":element[@name=\"" + XMLConstants.MESSAGE + "\"]";
Element dataElement = (Element) element.selectSingleNode(basePath);
String elementPath = "//" + XMLConstants.XSD_DEFAULT_NAMESPACE + ":element";
paseData(dataElement, "//", elementPath, "//");
return list;
}
/**
* 转换XSD的数据节点，生成XSDNode对象
*
* @param element
* @param xPath
* @param xsdPath
* @param unboundedXpath
*/
public void paseData(Element element, String xPath, String xsdPath, String unboundedXpath) {
// 获取节点name属性
String nodeName = element.attributeValue("name");
// 组装xml文档中节点的XPath
xPath += nodeName;
unboundedXpath += nodeName;
// 并列多节点限制属性
String maxOccurs = element.attributeValue("maxOccurs");
if (maxOccurs != null && !"1".equals(maxOccurs) && !("//" + XMLConstants.MESSAGE + "").equals(xPath)) {// 节点可以有多个
unboundedXpath += XMLConstants.XSD_UNBOUNDED;
}
// 下一个element元素的xsd XPath:sequence
String currentXsdPath_sequence = xsdPath + "[@name=\"" + nodeName + "\"]" + "/" + XMLConstants.XS_COMPLEXTYPE + "/"
+ XMLConstants.XS_SEQUENCE + "/" + XMLConstants.XS_ELEMENT;
// 下一个element元素的xsd XPath:choice
String currentXsdPath_choise = xsdPath + "[@name=\"" + nodeName + "\"]" + "/" + XMLConstants.XS_COMPLEXTYPE + "/"
+ XMLConstants.XS_CHOICE + "/" + XMLConstants.XS_ELEMENT;
String currentXsdPath = "";
// 查找该节点下所有的element元素
List<Node> elementNodes_sequence = element.selectNodes(currentXsdPath_sequence);
List<Node> elementNodes_choice = element.selectNodes(currentXsdPath_choise);
List<Node> elementNodes = null;
if (elementNodes_sequence != null && elementNodes_sequence.size() > 0) {
elementNodes = elementNodes_sequence;
currentXsdPath = currentXsdPath_sequence;
} else {
elementNodes = elementNodes_choice;
currentXsdPath = currentXsdPath_choise;
}
if (elementNodes != null && elementNodes.size() > 0) {// 如果下面还有element,说明不是叶子
Iterator<Node> nodes = elementNodes.iterator();
while (nodes.hasNext()) {
if (!xPath.endsWith("/")) {
xPath += "/";
unboundedXpath += "/";
}
Element ele = (Element) nodes.next();
paseData(ele, xPath, currentXsdPath, unboundedXpath);
}
} else { // 该element为叶子
XSDNode xsdNode = new XSDNode();
// 获取注释节点
String annotation = "";
Node annotationNode = element.selectSingleNode(xsdPath + "[@name=\"" + nodeName + "\"]/" + XMLConstants.XS_ANNOTATION
+ "/" + XMLConstants.XS_DOCUMENTATION);
if (annotationNode != null)
annotation = annotationNode.getText();
// 获取节点类型属性
String nodeType = "";
Attribute type = element.attribute("type");
if (type != null)
nodeType = type.getText();
else {
String spath = xsdPath + "[@name=\"" + nodeName + "\"]/" + XMLConstants.XS_SIMPLETYPE + "/"
+ XMLConstants.XS_RESTRICTION;
Element typeNode = (Element) element.selectSingleNode(spath);
if (typeNode != null) {
Attribute base = typeNode.attribute("base");
if (base != null)
nodeType = base.getText();
}
}
xsdNode.setName(nodeName);
xsdNode.setXPath(xPath);
xsdNode.setAnnotation(annotation);
xsdNode.setType(nodeType);
xsdNode.setUnboundedXpath(unboundedXpath);
if (xPath.equals(unboundedXpath))// 说明不是unbounded节点
xsdNode.setIsUnbounded("0");
else
xsdNode.setIsUnbounded("1");
list.add(xsdNode);
}
}
}
常量定义:
/** *******************XSD DID相关定义******************** */
public static final String XS_ELEMENT = "xs:element";
public static final String XS_SEQUENCE = "xs:sequence";
public static final String XS_CHOICE = "xs:choice";
public static final String XS_COMPLEXTYPE = "xs:complexType";
public static final String XS_SIMPLETYPE = "xs:simpleType";
public static final String XS_RESTRICTION = "xs:restriction";
public static final String XS_ANNOTATION = "xs:annotation";
public static final String XS_DOCUMENTATION = "xs:documentation";
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