【轉載】dom4j讀寫xml文檔

原文

http://kukuqiu.javaeye.com/blog/163476

 

據悉dom4j在xml解析方面是性能最好的，hibernate等框架都使用它作爲解析的工具
寫了簡單的dom4j的使用的demo，以備回憶，有些是dom4j的文擋裏例子改編的
使用dom4j解析下面的xml文件

<?
xml
 
version
=
"1.0"
 
encoding
=
"GB2312"
?>

<?
xml-stylesheet
 
type
=
"text/xsl"
 
href
=
"students.xsl"
?>

<
students
>
    
<
student
 
sn
=
"01"
>
        
<
name
>
張三
</
name
>
        
<
age
>
18
</
age
>
    
</
student
>

    
<
student
 
sn
=
"02"
>
        
<
name
>
李四
</
name
>
        
<
age
>
20
</
age
>
    
</
student
>
</
students
>

<?xml version="1.0" encoding="GB2312"?> 

<?xml-stylesheet type="text/xsl" href="students.xsl"?>

<students>
    <student sn="01">
        <name>張三</name>
        <age>18</age>
    </student>
    
    <student sn="02">
        <name>李四</name>
        <age>20</age>
    </student>
</students>

Parse.java

import
 java.io.File;

import
 org.dom4j.Attribute;
import
 org.dom4j.Document;
import
 org.dom4j.DocumentException;
import
 org.dom4j.Element;
import
 org.dom4j.ProcessingInstruction;
import
 org.dom4j.VisitorSupport;
import
 org.dom4j.io.SAXReader;

public
 
class
 Parse {

    
public
 
static
 
void
 main(String[] args) {
        SAXReader reader = 
new
 SAXReader();
        File file = 
new
 File(
"src/students.xml"
);
        
try
 {
            Document doc = reader.read(file);
            doc.accept(
new
 MyVistor());
        } 
catch
 (DocumentException e) {
            
// TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    
public
 
static
 
class
 MyVistor 
extends
 VisitorSupport {
        
public
 
void
 visit(Attribute node) {
            System.out.println(
"Attibute:---"
 + node.getName() + 
"="
                    + node.getValue());
        }

        
public
 
void
 visit(Element node) {
            
if
 (node.isTextOnly()) {
                System.out.println(
"Element:---"
 + node.getName() + 
"="
                        + node.getText());
            }
else
{
                System.out.println(
"--------"
 + node.getName() + 
"-------"
);
            }
        }

        
@Override
        
public
 
void
 visit(ProcessingInstruction node) {
            
// TODO Auto-generated method stub
            System.out.println(
"PI:"
+node.getTarget()+
" "
+node.getText());
        }
    }
}

import java.io.File;

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.ProcessingInstruction;
import org.dom4j.VisitorSupport;
import org.dom4j.io.SAXReader;

public class Parse {

	public static void main(String[] args) {
		SAXReader reader = new SAXReader();
		File file = new File("src/students.xml");
		try {
			Document doc = reader.read(file);
			doc.accept(new MyVistor());
		} catch (DocumentException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public static class MyVistor extends VisitorSupport {
		public void visit(Attribute node) {
			System.out.println("Attibute:---" + node.getName() + "="
					+ node.getValue());
		}

		public void visit(Element node) {
			if (node.isTextOnly()) {
				System.out.println("Element:---" + node.getName() + "="
						+ node.getText());
			}else{
				System.out.println("--------" + node.getName() + "-------");
			}
		}

		@Override
		public void visit(ProcessingInstruction node) {
			// TODO Auto-generated method stub
			System.out.println("PI:"+node.getTarget()+" "+node.getText());
		}
	}
}

使用dom4j來將屬性寫入xml

import
 java.io.FileWriter;
import
 java.io.IOException;

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

public
 
class
 DWriter {

    
public
 
static
 
void
 main(String[] args) {
        
// TODO Auto-generated method stub
        
try
 {
            XMLWriter writer = 
new
 XMLWriter(
new
 FileWriter(
"src/author.xml"
));
            Document doc = createDoc();
            writer.write(doc);
            writer.close();

            
// Pretty print the document to System.out
            
// 設置了打印的格式,將讀出到控制檯的格式進行美化
            OutputFormat format = OutputFormat.createPrettyPrint();
            writer = 
new
 XMLWriter(System.out, format);
            writer.write(doc);

        } 
catch
 (IOException e) {
            
// TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    
public
 
static
 Document createDoc() {
        Document doc = DocumentHelper.createDocument();
        Element root = doc.addElement(
"root"
);
        Element author1 = root.addElement(
"author"
).addAttribute(
"name"
,
                
"James"
).addAttribute(
"location"
, 
"UK"
)
                .addText(
"Jame Strachan"
);
        Element author2 = root.addElement(
"author"
).addAttribute(
"name"
, 
"Bob"
)
                .addAttribute(
"location"
, 
"US"
).addText(
"Bob McWrirter"
);
        
return
 doc;
    }

}

import java.io.FileWriter;
import java.io.IOException;

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

public class DWriter {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		try {
			XMLWriter writer = new XMLWriter(new FileWriter("src/author.xml"));
			Document doc = createDoc();
			writer.write(doc);
			writer.close();

			// Pretty print the document to System.out
			// 設置了打印的格式,將讀出到控制檯的格式進行美化
			OutputFormat format = OutputFormat.createPrettyPrint();
			writer = new XMLWriter(System.out, format);
			writer.write(doc);

		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public static Document createDoc() {
		Document doc = DocumentHelper.createDocument();
		Element root = doc.addElement("root");
		Element author1 = root.addElement("author").addAttribute("name",
				"James").addAttribute("location", "UK")
				.addText("Jame Strachan");
		Element author2 = root.addElement("author").addAttribute("name", "Bob")
				.addAttribute("location", "US").addText("Bob McWrirter");
		return doc;
	}

}

使用dom4j寫入到author.xml文件的內容

<?
xml
 
version
=
"1.0"
 
encoding
=
"UTF-8"
?>
<
root
>
<
author
 
name
=
"James"
 
location
=
"UK"
>
Jame Strachan
</
author
>
<
author
 
name
=
"Bob"
 
location
=
"US"
>
Bob McWrirter
</
author
>
</
root
>