Java读取xml文件

简单的java读取xml文件方法(相对路径的xml文件),，分为两种： 一种是简单的键值对的xml文件, 通过Properties读取；一种是普通的xml文件， 此处使用dom4j读取

一.简单的键值对应的xml文件读取

1.xml文件 文件名(key-value-xml.xml)

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">  
<properties>
	<entry key="sql1">
		Select  sysdate From dual  q
	</entry>
	
	<entry key="sql2">
		Select 1 From dual  q
	</entry>
</properties>

 

2.java代码

public static void simpleKeyValueXmlRead(){
	Properties props = new Properties();
	
	//xml的相对路径
	String xmlpath="com/meotd/service/key-value-xml.xml";
	ClassLoader classLoader=XmlReadLearn.class.getClassLoader();		//这里XmlReadLearn是当前类
	InputStream in=classLoader.getResourceAsStream(xmlpath);

	try {
		props.loadFromXML(in);
		System.out.println("按照Key打印");
		System.out.println(props.getProperty("sql1"));  //"sql1"是xml中某个entry的key值
		
		
		System.out.println("打印所有的属性值");
		Enumeration<Object> set2 = props.keys();
		while (set2.hasMoreElements()) {
			String key = (String) set2.nextElement();
			System.out.println(props.getProperty(key)); 
		}
	} catch (Exception e) {
		e.printStackTrace();
	} 
}

 

 

二.普通的xml文件读取(dom4j)

1.xml代码

<?xml version="1.0" encoding="UTF-8"?>
<sqls>
	<sql id="attr-desc-data">
		Select Distinct Tag_Name As Identifier,
			'string' As Type,
			Tag_Name As Name,
			Tag_Name As Description,
			Null As Secondarydescription,
			'CMS MIG' As Attributefield3,
			'TRUE' As Displayable,
			'TRUE' As Comparable,
			Decode(Secondary_Navigation, 0, 'FALSE', 1, 'TRUE') As Facetable
		From Cms_Tag
		Order By 1
	</sql>
		
	<sql id="attrval-desc-data">
		Select 
			Tag_Name As Identifier,
			'string' As Type,
			Tag_Value As ValueIdentifier,
			'1' As ValueUsage,
			0 As sequence,
			tag_value As Value, 
			Freetype_Id As field1
		From Cms_Tag 
		Order By Tag_Name
	</sql>

</sqls>

 

2.java代码

public static void normalXmlRead(){

	SAXReader reader = new SAXReader();  
	Document doc;
	
	//xml的相对路径
	String xmlpath="com/meotd/service/normal-xml.xml";
	ClassLoader classLoader=XmlReadLearn.class.getClassLoader();
	InputStream in=classLoader.getResourceAsStream(xmlpath);
	
	try {
		doc = reader.read(in);
		List ls=doc.selectNodes("/sqls/sql");  //查找"sql"节点
		Iterator it=ls.iterator();  
		
		while(it.hasNext()){  
		  Element elm=(Element)it.next();
		  System.out.println(elm.getText()); //打印sql节点的text值
		  
		  /*	
		  if(elm.attributeValue("id").equals("attr-desc-data")){  //打印id是'attr-desc-data'的sql, 可用于返回
			  sql=elm.getText().trim();
			  System.out.println(sql);
			  break;
		  }
		  */
		}
		
	} catch (DocumentException e) {
		e.printStackTrace();
	} 
}

 

 

PS: 有个可能会被遗忘的jar包一定要导入 jaxen-1.1.1.jar