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最新评论
-
lt26w:
理解成门面模式应该比较容易明白吧
FacadePattern-Java代码实例讲解 -
lt26w:
看下面的例子比较明白.
FacadePattern-Java代码实例讲解 -
javaloverkehui:
这也叫文档,别逗我行吗,也就自己看看。
HtmlCleaner API -
SE_XiaoFeng:
至少也应该写个注释吧。
HtmlCleaner API -
jfzshandong:
...
org.springframework.web.filter.CharacterEncodingFilter 配置
这是一个用JAVA W3C DOM 进行XML操作的例子,包含了查询、增加、修改、删除、保存的基本操作。较完整的描述了一个XML的整个操作流程。适合刚入门JAVA XML操作的朋友参考和学习。
假设有XML文件:test1.xml
<?
xml version="1.0" encoding="UTF-8"
?>
< books >
< book >
< name > 哈里波特 </ name >
< price > 10 </ price >
< memo > 这是一本很好看的书。 </ memo >
</ book >
< book id ="B02" >
< name > 三国演义 </ name >
< price > 10 </ price >
< memo > 四大名著之一。 </ memo >
</ book >
< book id ="B03" >
< name > 水浒 </ name >
< price > 6 </ price >
< memo > 四大名著之一。 </ memo >
</ book >
< book id ="B04" >
< name > 红楼 </ name >
< price > 5 </ price >
< memo > 四大名著之一。 </ memo >
</ book >
</ books >
< books >
< book >
< name > 哈里波特 </ name >
< price > 10 </ price >
< memo > 这是一本很好看的书。 </ memo >
</ book >
< book id ="B02" >
< name > 三国演义 </ name >
< price > 10 </ price >
< memo > 四大名著之一。 </ memo >
</ book >
< book id ="B03" >
< name > 水浒 </ name >
< price > 6 </ price >
< memo > 四大名著之一。 </ memo >
</ book >
< book id ="B04" >
< name > 红楼 </ name >
< price > 5 </ price >
< memo > 四大名著之一。 </ memo >
</ book >
</ books >
下面是为Test.java
import
java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import org.w3c.dom. * ;
import org.xml.sax.SAXException;
import javax.xml.parsers. * ;
import javax.xml.transform. * ;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream. * ;
import javax.xml.xpath. * ;
public class Test ... {
public static void main(String[] args) ... {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
Element theBook = null , theElem = null , root = null ;
try ... {
factory.setIgnoringElementContentWhitespace( true );
DocumentBuilder db = factory.newDocumentBuilder();
Document xmldoc = db.parse( new File( " Test1.xml " ));
root = xmldoc.getDocumentElement();
// --- 新建一本书开始 ----
theBook = xmldoc.createElement( " book " );
theElem = xmldoc.createElement( " name " );
theElem.setTextContent( " 新书 " );
theBook.appendChild(theElem);
theElem = xmldoc.createElement( " price " );
theElem.setTextContent( " 20 " );
theBook.appendChild(theElem);
theElem = xmldoc.createElement( " memo " );
theElem.setTextContent( " 新书的更好看。 " );
theBook.appendChild(theElem);
root.appendChild(theBook);
System.out.println( " --- 新建一本书开始 ---- " );
output(xmldoc);
// --- 新建一本书完成 ----
// --- 下面对《哈里波特》做一些修改。 ----
// --- 查询找《哈里波特》----
theBook = (Element) selectSingleNode( " /books/book[name='哈里波特'] " , root);
System.out.println( " --- 查询找《哈里波特》 ---- " );
output(theBook);
// --- 此时修改这本书的价格 -----
theBook.getElementsByTagName( " price " ).item( 0 ).setTextContent( " 15 " ); // getElementsByTagName返回的是NodeList,所以要跟上item(0)。另外,getElementsByTagName("price")相当于xpath的".//price"。
System.out.println( " --- 此时修改这本书的价格 ---- " );
output(theBook);
// --- 另外还想加一个属性id,值为B01 ----
theBook.setAttribute( " id " , " B01 " );
System.out.println( " --- 另外还想加一个属性id,值为B01 ---- " );
output(theBook);
// --- 对《哈里波特》修改完成。 ----
// --- 要用id属性删除《三国演义》这本书 ----
theBook = (Element) selectSingleNode( " /books/book[@id='B02'] " , root);
System.out.println( " --- 要用id属性删除《三国演义》这本书 ---- " );
output(theBook);
theBook.getParentNode().removeChild(theBook);
System.out.println( " --- 删除后的XML ---- " );
output(xmldoc);
// --- 再将所有价格低于10的书删除 ----
NodeList someBooks = selectNodes( " /books/book[price<10] " , root);
System.out.println( " --- 再将所有价格低于10的书删除 --- " );
System.out.println( " --- 符合条件的书有 " + someBooks.getLength() + " 本。 --- " );
for ( int i = 0 ;i < someBooks.getLength();i ++ ) ... {
someBooks.item(i).getParentNode().removeChild(someBooks.item(i));
}
output(xmldoc);
saveXml( " Test1_Edited.xml " , xmldoc);
} catch (ParserConfigurationException e) ... {
e.printStackTrace();
} catch (SAXException e) ... {
e.printStackTrace();
} catch (IOException e) ... {
e.printStackTrace();
}
}
public static void output(Node node) ... { // 将node的XML字符串输出到控制台
TransformerFactory transFactory = TransformerFactory.newInstance();
try ... {
Transformer transformer = transFactory.newTransformer();
transformer.setOutputProperty( " encoding " , " gb2312 " );
transformer.setOutputProperty( " indent " , " yes " );
DOMSource source = new DOMSource();
source.setNode(node);
StreamResult result = new StreamResult();
result.setOutputStream(System.out);
transformer.transform(source, result);
} catch (TransformerConfigurationException e) ... {
e.printStackTrace();
} catch (TransformerException e) ... {
e.printStackTrace();
}
}
public static Node selectSingleNode(String express, Object source) ... { // 查找节点,并返回第一个符合条件节点
Node result = null ;
XPathFactory xpathFactory = XPathFactory.newInstance();
XPath xpath = xpathFactory.newXPath();
try ... {
result = (Node) xpath.evaluate(express, source, XPathConstants.NODE);
} catch (XPathExpressionException e) ... {
e.printStackTrace();
}
return result;
}
public static NodeList selectNodes(String express, Object source) ... { // 查找节点,返回符合条件的节点集。
NodeList result = null ;
XPathFactory xpathFactory = XPathFactory.newInstance();
XPath xpath = xpathFactory.newXPath();
try ... {
result = (NodeList) xpath.evaluate(express, source, XPathConstants.NODESET);
} catch (XPathExpressionException e) ... {
e.printStackTrace();
}
return result;
}
public static void saveXml(String fileName, Document doc) ... { // 将Document输出到文件
TransformerFactory transFactory = TransformerFactory.newInstance();
try ... {
Transformer transformer = transFactory.newTransformer();
transformer.setOutputProperty( " indent " , " yes " );
DOMSource source = new DOMSource();
source.setNode(doc);
StreamResult result = new StreamResult();
result.setOutputStream( new FileOutputStream(fileName));
transformer.transform(source, result);
} catch (TransformerConfigurationException e) ... {
e.printStackTrace();
} catch (TransformerException e) ... {
e.printStackTrace();
} catch (FileNotFoundException e) ... {
e.printStackTrace();
}
}
}
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import org.w3c.dom. * ;
import org.xml.sax.SAXException;
import javax.xml.parsers. * ;
import javax.xml.transform. * ;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream. * ;
import javax.xml.xpath. * ;
public class Test ... {
public static void main(String[] args) ... {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
Element theBook = null , theElem = null , root = null ;
try ... {
factory.setIgnoringElementContentWhitespace( true );
DocumentBuilder db = factory.newDocumentBuilder();
Document xmldoc = db.parse( new File( " Test1.xml " ));
root = xmldoc.getDocumentElement();
// --- 新建一本书开始 ----
theBook = xmldoc.createElement( " book " );
theElem = xmldoc.createElement( " name " );
theElem.setTextContent( " 新书 " );
theBook.appendChild(theElem);
theElem = xmldoc.createElement( " price " );
theElem.setTextContent( " 20 " );
theBook.appendChild(theElem);
theElem = xmldoc.createElement( " memo " );
theElem.setTextContent( " 新书的更好看。 " );
theBook.appendChild(theElem);
root.appendChild(theBook);
System.out.println( " --- 新建一本书开始 ---- " );
output(xmldoc);
// --- 新建一本书完成 ----
// --- 下面对《哈里波特》做一些修改。 ----
// --- 查询找《哈里波特》----
theBook = (Element) selectSingleNode( " /books/book[name='哈里波特'] " , root);
System.out.println( " --- 查询找《哈里波特》 ---- " );
output(theBook);
// --- 此时修改这本书的价格 -----
theBook.getElementsByTagName( " price " ).item( 0 ).setTextContent( " 15 " ); // getElementsByTagName返回的是NodeList,所以要跟上item(0)。另外,getElementsByTagName("price")相当于xpath的".//price"。
System.out.println( " --- 此时修改这本书的价格 ---- " );
output(theBook);
// --- 另外还想加一个属性id,值为B01 ----
theBook.setAttribute( " id " , " B01 " );
System.out.println( " --- 另外还想加一个属性id,值为B01 ---- " );
output(theBook);
// --- 对《哈里波特》修改完成。 ----
// --- 要用id属性删除《三国演义》这本书 ----
theBook = (Element) selectSingleNode( " /books/book[@id='B02'] " , root);
System.out.println( " --- 要用id属性删除《三国演义》这本书 ---- " );
output(theBook);
theBook.getParentNode().removeChild(theBook);
System.out.println( " --- 删除后的XML ---- " );
output(xmldoc);
// --- 再将所有价格低于10的书删除 ----
NodeList someBooks = selectNodes( " /books/book[price<10] " , root);
System.out.println( " --- 再将所有价格低于10的书删除 --- " );
System.out.println( " --- 符合条件的书有 " + someBooks.getLength() + " 本。 --- " );
for ( int i = 0 ;i < someBooks.getLength();i ++ ) ... {
someBooks.item(i).getParentNode().removeChild(someBooks.item(i));
}
output(xmldoc);
saveXml( " Test1_Edited.xml " , xmldoc);
} catch (ParserConfigurationException e) ... {
e.printStackTrace();
} catch (SAXException e) ... {
e.printStackTrace();
} catch (IOException e) ... {
e.printStackTrace();
}
}
public static void output(Node node) ... { // 将node的XML字符串输出到控制台
TransformerFactory transFactory = TransformerFactory.newInstance();
try ... {
Transformer transformer = transFactory.newTransformer();
transformer.setOutputProperty( " encoding " , " gb2312 " );
transformer.setOutputProperty( " indent " , " yes " );
DOMSource source = new DOMSource();
source.setNode(node);
StreamResult result = new StreamResult();
result.setOutputStream(System.out);
transformer.transform(source, result);
} catch (TransformerConfigurationException e) ... {
e.printStackTrace();
} catch (TransformerException e) ... {
e.printStackTrace();
}
}
public static Node selectSingleNode(String express, Object source) ... { // 查找节点,并返回第一个符合条件节点
Node result = null ;
XPathFactory xpathFactory = XPathFactory.newInstance();
XPath xpath = xpathFactory.newXPath();
try ... {
result = (Node) xpath.evaluate(express, source, XPathConstants.NODE);
} catch (XPathExpressionException e) ... {
e.printStackTrace();
}
return result;
}
public static NodeList selectNodes(String express, Object source) ... { // 查找节点,返回符合条件的节点集。
NodeList result = null ;
XPathFactory xpathFactory = XPathFactory.newInstance();
XPath xpath = xpathFactory.newXPath();
try ... {
result = (NodeList) xpath.evaluate(express, source, XPathConstants.NODESET);
} catch (XPathExpressionException e) ... {
e.printStackTrace();
}
return result;
}
public static void saveXml(String fileName, Document doc) ... { // 将Document输出到文件
TransformerFactory transFactory = TransformerFactory.newInstance();
try ... {
Transformer transformer = transFactory.newTransformer();
transformer.setOutputProperty( " indent " , " yes " );
DOMSource source = new DOMSource();
source.setNode(doc);
StreamResult result = new StreamResult();
result.setOutputStream( new FileOutputStream(fileName));
transformer.transform(source, result);
} catch (TransformerConfigurationException e) ... {
e.printStackTrace();
} catch (TransformerException e) ... {
e.printStackTrace();
} catch (FileNotFoundException e) ... {
e.printStackTrace();
}
}
}
发表评论
-
java中四种操作xml方式的比较
2009-12-10 15:11 11381. 介绍 1)DOM(JAXP Crimson ... -
Java操作XML编程实例解析
2009-12-10 14:57 1718XML作为全球通用的结构化语言,越来越受人们青睐,各种开发平台 ... -
java读写xml操作
2009-12-10 14:56 1085- 07 - 30 ... -
Java开源XML UI工具包
2009-12-10 14:52 3138Java开源XML U ... -
Java开源 XML操作类库
2009-12-10 14:49 2083Xerces Xerces是由Apac ... -
Java使用XStream将集合类内容序列化为XML
2009-12-06 19:38 1385最近因工作需要,在研究将Collection 生成xml文件, ...
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