dom4j的基本操作

2014-07-01 网页编程网 网页编程网

/**

* 建立一个XML文档,文档名由输入属性决定

* @param filename 需建立的文件名

* @return 返回操作结果, 0表失败, 1表成功

*/
import java.io.File;
import java.io.FileWriter;
import org.dom4j.io.XMLWriter;
import org.dom4j.*;
public class CreateDoc{

public int createXMLFile(String filename){

/** 返回操作结果, 0表失败, 1表成功 */

int returnValue = 0;

/** 建立document对象 */

Document document =DocumentHelper.createDocument();

/** 建立XML文档的根books */

Element booksElement = document.addElement("books");

/** 加入一行注释 */

booksElement.addComment("This is a test for dom4j, holen, 2004.9.11");

/** 加入第一个book节点 */

Element bookElement = booksElement.addElement("book");

/** 加入show属性内容 */

bookElement.addAttribute("show","yes");

/** 加入title节点 */

Element titleElement = bookElement.addElement("title");

/** 为title设置内容 */

titleElement.setText("Dom4j Tutorials");



/** 类似的完成后两个book */

bookElement = booksElement.addElement("book");

bookElement.addAttribute("show","yes");

titleElement = bookElement.addElement("title");

titleElement.setText("Lucene Studing");

bookElement = booksElement.addElement("book");

bookElement.addAttribute("show","no");

titleElement = bookElement.addElement("title");

titleElement.setText("Lucene in Action");



/** 加入owner节点 */

Element ownerElement = booksElement.addElement("owner");

ownerElement.setText("O'Reilly");



try{

/** 将document中的内容写入文件中 */

XMLWriter writer = new XMLWriter(new FileWriter(new File(filename)));

writer.write(document);

writer.close();

/** 执行成功,需返回1 */

returnValue = 1;

}catch(Exception ex){

ex.printStackTrace();

}



return returnValue;

}
public static void main(String[]args){
CreateDoc cd=new CreateDoc();
int i=cd.createXMLFile("D:\\mybook.xml");
if(i==1){
System.out.println("建立成功！");
}
else{
System.out.println("建立失败！");
}

}
}

===================================================================

dom4j写xml文件测试：

package com.yanek.demo.xml.test;

import java.io.File;
import java.io.FileWriter;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.XMLWriter;

public class DOM4j {

public static void main(String[] args) {
// dom4j解析xml测试

// 1. dom4j写xml

/*
* <?xml version="1.0" encoding="UTF-8"?> <actions> <action path="/test"
* class="com.mystruts.demo.LoginAction"> <forward name="success"
* url="hello.jsp"/> <forward name="fail" url="fail.jsp"/> </action>
* <action path="/user" class="com.mystruts.demo.UserAction"> <forward
* name="success" url="list.jsp"/> <forward name="fail" url="fail.jsp"/>
* </action> </actions>
*/
Document document = DocumentHelper.createDocument();
Element actionsElement = document.addElement("actions");

Element actionElement1 = actionsElement.addElement("action");
actionElement1.addAttribute("path", "/test");
actionElement1.addAttribute("class", "com.mystruts.demo.LoginAction");

Element forwardElement1 = actionElement1.addElement("forward");
forwardElement1.addAttribute("name", "success");
forwardElement1.addAttribute("url", "hello.jsp");

Element forwardElement2 = actionElement1.addElement("forward");
forwardElement2.addAttribute("name", "fail");
forwardElement2.addAttribute("url", "fail.jsp");

Element actionElement2 = actionsElement.addElement("action");
actionElement2.addAttribute("path", "/user");
actionElement2.addAttribute("class", "com.mystruts.demo.UserAction");

Element forwardElement21 = actionElement2.addElement("forward");
forwardElement21.addAttribute("name", "success");
forwardElement21.addAttribute("url", "list.jsp");

Element forwardElement22 = actionElement2.addElement("forward");
forwardElement22.addAttribute("name", "fail");
forwardElement22.addAttribute("url", "fail.jsp");

try {
/** 将document中的内容写入文件中 */
XMLWriter writer = new XMLWriter(new FileWriter(new File(
"d:\\mystruts.xml")));
writer.write(document);
writer.close();
/** 执行成功,需返回1 */

} catch (Exception ex) {
ex.printStackTrace();
}

System.out.println(document.asXML());

}

生成xml:

<?xml version="1.0" encoding="UTF-8"?>
<actions><action path="/test" class="com.mystruts.demo.LoginAction"><forward name="success" url="hello.jsp"/><forward name="fail" url="fail.jsp"/></action><action path="/user" class="com.mystruts.demo.UserAction"><forward name="success" url="list.jsp"/><forward name="fail" url="fail.jsp"/></action></actions>

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/5iasp/archive/2009/06/12/4263354.aspx

=======================================================================================

import java.io.File;
import java.io.FileWriter;
import java.util.Iterator;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

public class DOM4JTest {

* DOM4J读写XML示例
*
* @param args
* @throws Exception
*/
public static void main(String[] args) {
try {
XMLWriter writer = null ; // 声明写XML的对象
SAXReader reader = new SAXReader();

OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding( " GBK " ); // 设置XML文件的编码格式

String filePath = " d:\\student.xml " ;
File file = new File(filePath);
if (file.exists()) {
Document document = reader.read(file); // 读取XML文件
Element root = document.getRootElement(); // 得到根节点
boolean bl = false ;
for (Iterator i = root.elementIterator( " 学生 " ); i.hasNext();) {
Element student = (Element) i.next();
if (student.attributeValue( " sid " ).equals( " 001 " )) {
// 修改学生sid=001的学生信息
student.selectSingleNode( " 姓名 " ).setText( " 王五 " );
student.selectSingleNode( " 年龄 " ).setText( " 25 " );

writer = new XMLWriter( new FileWriter(filePath), format);
writer.write(document);
writer.close();
bl = true ;
break ;
}
}
if (bl) {
// 添加一个学生信息
Element student = root.addElement( " 学生 " );
student.addAttribute( " sid " , " 100 " );
Element sid = student.addElement( " 编号 " );
sid.setText( " 100 " );
Element name = student.addElement( " 姓名 " );
name.setText( " 嘎嘎 " );
Element sex = student.addElement( " 性别 " );
sex.setText( " 男 " );
Element age = student.addElement( " 年龄 " );
age.setText( " 21 " );

writer = new XMLWriter( new FileWriter(filePath), format);
writer.write(document);
writer.close();
}
} else {
// 新建student.xml文件并新增内容
Document _document = DocumentHelper.createDocument();
Element _root = _document.addElement( " 学生信息 " );
Element _student = _root.addElement( " 学生 " );
_student.addAttribute( " sid " , " 001 " );
Element _id = _student.addElement( " 编号 " );
_id.setText( " 001 " );
Element _name = _student.addElement( " 姓名 " );
_name.setText( " 灰机 " );
Element _age = _student.addElement( " 年龄 " );
_age.setText( " 18 " );

writer = new XMLWriter( new FileWriter(file), format);
writer.write(_document);
writer.close();
}
System.out.println( " 操作结束! " );
} catch (Exception e) {
e.printStackTrace();
}

}
}

执行结果应该是这样：
循环解析节点：

private void getAllNodes(String xml) {
try {
Document authtmp = DocumentHelper.parseText(xml);
List < Element > list = authtmp.selectNodes( " //sms/node " );
for ( int j = 0 ; j < list.size(); j ++ ) {
Element node = (Element) list.get(j);
nodeByNodes(node);
}
} catch (Exception e) {
e.printStackTrace();
}
}

private void nodeByNodes(Element node) {
if (node.element( " node " ) != null ) {
String id = node.attributeValue( " id " );
String name = node.attributeValue( " name " );
System.out.print(id + " ------- " );
System.out.println(name);
for (Iterator i = node.elementIterator( " node " ); i.hasNext();) {
Element newNode = (Element) i.next();
nodeByNodes(newNode);
}
} else {
String id = node.attributeValue( " id " );
String name = node.attributeValue( " name " );
System.out.print(id + " ------- " );
System.out.println(name);
}
}

其次DOM4J的解释

一.Document对象相关

1.读取XML文件,获得document对象.

SAXReader reader = new SAXReader();
Document document = reader.read( new File( " input.xml " ));

2.解析XML形式的文本,得到document对象.

String text = " <members></members> ";
Document document = DocumentHelper.parseText(text);

3.主动创建document对象.

Document document = DocumentHelper.createDocument();
Element root = document.addElement( " members " ); // 创建根节点

二.节点相关

1.获取文档的根节点.

Element rootElm = document.getRootElement();

2.取得某节点的单个子节点.

Element memberElm = root.element( " member " ); // "member"是节点名

3.取得节点的文字

String text = memberElm.getText();
也可以用:

String text = root.elementText( " name " );
这个是取得根节点下的name字节点的文字.

4.取得某节点下名为"member"的所有字节点并进行遍历.

List nodes = rootElm.elements( " member ");

for (Iterator it = nodes.iterator(); it.hasNext();) {
Element elm = (Element) it.next();
// do something
}

5.对某节点下的所有子节点进行遍历.

for (Iterator it = root.elementIterator();it.hasNext();) {
Element element = (Element) it.next();
// do something
}

6.在某节点下添加子节点.

Element ageElm = newMemberElm.addElement( " age " );

7.设置节点文字.

ageElm.setText( " 29 " );

8.删除某节点.

parentElm.remove(childElm); // childElm是待删除的节点,parentElm是其父节点

9.添加一个CDATA节点.

Element contentElm = infoElm.addElement( " content " );
contentElm.addCDATA(diary.getContent());

contentElm.getText(); // 特别说明：获取节点的CDATA值与获取节点的值是一个方法
contentElm.clearContent(); //清除节点中的内容，CDATA亦可

三.属性相关.
1.取得某节点下的某属性

Element root = document.getRootElement();
Attribute attribute = root.attribute( " size " ); // 属性名name

2.取得属性的文字

String text = attribute.getText();
也可以用:

String text2 = root.element( " name " ).attributeValue( " firstname " );
这个是取得根节点下name字节点的属性firstname的值.

3.遍历某节点的所有属性

Element root = document.getRootElement();
for (Iterator it = root.attributeIterator();it.hasNext();) {
Attribute attribute = (Attribute) it.next();
String text = attribute.getText();
System.out.println(text);
}

4.设置某节点的属性和文字.

newMemberElm.addAttribute( " name " , " sitinspring " );

5.设置属性的文字

Attribute attribute = root.attribute( " name " );
attribute.setText( " sitinspring " );

6.删除某属性

Attribute attribute = root.attribute( " size " ); // 属性名name
root.remove(attribute);

四.将文档写入XML文件.
1.文档中全为英文,不设置编码,直接写入的形式.
XMLWriter writer = new XMLWriter( new FileWriter( " output.xml " ));

阅读原文

阅读 3639

123 显示电脑版