使用dom4j解析指定节点下的信息

需要的 jar 包：

dom4j-1.6.1.jar

jaxen-1.1.1.jar

log4j-1.2.8.jar

 

sql.xml

 

<?xml version="1.0" encoding="UTF-8"?>
<config>
	<sql>
		<user>
			<queryList>
				select * from t_user
			</queryList>
		</user>
	</sql>
</config>

 

java代码:

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;

import org.apache.log4j.Logger;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

/**
 * @ClassName: CommonMethods
 * @Description: 公共方法
 * @author wenjianhai
 * @company 广州市道一信息技术有限公司
 * @date 2012-5-27
 * @version V1.0
 */

public final class CommonMethods {

	private static final Logger LOG = Logger.getLogger(CommonMethods.class);

	private CommonMethods() {
	}

	/**
	 * @Title: parseSqlXML
	 * @Description: 使用DOM4J解析xml文件
	 * @param sqlXMLPath
	 *            xml文件路径
	 * @param _node
	 *            xml节点
	 * @return String
	 * @author wenjianhai
	 * @date 2012-5-27
	 */
	@SuppressWarnings("rawtypes")
	public static String parseSqlXML(String sqlXMLPath, String _node) {

		LOG.info("into CommonMethods.parseSqlXML(...)");
		LOG.info("the sqlXMLPath is:" + sqlXMLPath);
		LOG.info("the xml node is:" + _node);

		if ((null != _node && !"".equals(_node))
				&& (null != sqlXMLPath && !"".equals(sqlXMLPath))) {

			try {
				LOG.info("put the file '" + sqlXMLPath + "' into InputStream.");
				// 加载xml文件到输入流中
				InputStream is = CommonMethods.class.getClassLoader()
						.getResourceAsStream(sqlXMLPath);
				//
				SAXReader reader = new SAXReader();

				// 读取xml文件,返回xml文档
				Document doc = reader.read(is);
				// 根节点
				Element root = doc.getRootElement();
				// 从当前节点的子节点中选择名称为_node的节点
				List rootList = root.selectNodes(_node);

				// xml元素
				Element element = null;

				// 返回的sql
				String sql = null;

				// 循环此节点,并取出对应的文本信息
				for (Object obj : rootList) {
					element = (Element) obj;
					sql = element.getTextTrim();
				}
				// 关闭输入流
				closeStream(is, null);

				LOG.info("out of CommonMethods.parseSqlXML(...)");

				return sql;

			} catch (DocumentException e) {
				LOG.error("read xml file '" + sqlXMLPath + "' faile!", e);
			} catch (Exception e) {
				LOG.error("parse Sql XML '" + sqlXMLPath + "' faile!", e);
			}
		}
		LOG.info("the sqlXMLPath and _node is null,return null.");
		LOG.info("out of CommonMethods.parseSqlXML(...)");
		return null;
	}

	/**
	 * @Title: closeStream
	 * @Description: 关闭输入/输出流
	 * @param is
	 *            : 字节输入流
	 * @param os
	 *            : 字节输出流
	 * @author wenjianhai
	 * @date 2012-5-27
	 */
	public static void closeStream(InputStream is, OutputStream os) {

		if (null != is) {
			try {
				is.close();
			} catch (IOException e) {
				LOG.error("close InputStream faile!", e);
			}
		}

		if (null != os) {
			try {
				os.close();
			} catch (IOException e) {
				LOG.error("close OutputStream faile!", e);
			}
		}
	}
}

 

测试: 使用junit4

@Test
	public void parseSqlXML() {
		String _node = "sql/mywb/queryList";
		String sqlXMLPath = "cn/com/do1/component/mywb/resource/sql.xml";
		String sql = CommonMethods.parseSqlXML(sqlXMLPath, _node);
		System.out.println(sql);
	}

 

测试结果:

sql=select * from t_user

评论

1 楼 xurichusheng 2011-06-13  

/**
* @Title: dom4jParse
* @Description: 使用dom4j解析指定节点下的信息
* @param filePath : 要解析的文件的路径及文件名
* @param config : 要解析的节点
* @return String : 指定节点下的文本信息
*/
public static String dom4jParse(String filePath, String config){

String sql = "";

if (null!=config && !"".equals(config.trim())){

SAXReader reader = new SAXReader();

try {
InputStream is = XMLParse.class.getClassLoader().getResourceAsStream(
filePath);

Document document = reader.read(is);

/* 或者
* Document document = reader.read(
new File(filePath));*/

//获取文档的根节点
Element root = document.getRootElement();

//从当前节点的子节点中选择名称为 s 的节点
List rootList = root.selectNodes(config);

//循环此节点，并取出对应的文本信息
for(Object obj : rootList){
Element element = (Element)obj;
sql = element.getTextTrim();
}

} catch (DocumentException e) {
log.error("read xml file error.", e);
} catch (Exception e){
log.error("dom4j Parse xml file error.", e);
}
}

return sql;
}