ＪＡＶＡ中解析ＸＭＬ文件

对XML文件解析配置:
先写一个需要解析的XML文件,本例中用TestConfig.xml,其内容如下:
<?xml version="1.0" encoding="UTF-8"?>
<searchs>

<search type="search1">
<table>REF_COUNTRY</table>
<conditions>
<condition name="代码" type="String">CNTRY_ISO_CD</condition>
<condition name="中文名" type="String">CNTRY_CHN_NM</condition>
<condition name="英文名" type="String">CNTRY_ENG_NM</condition>
</conditions>
<results>
<result name="代码" type="String">CNTRY_ISO_CD</result>
<result name="中文名" type="String">CNTRY_CHN_NM</result>
<result name="英文名" type="String">CNTRY_ENG_NM</result>
</results>
</search>

<search type="search2">
<table>REF_AIRPORT</table>
<conditions>
<condition name="代码" type="String">AIRPORT_IATA_CD</condition>
<condition name="中文名" type="String">AIRPORT_ENG_NM</condition>
<condition name="英文名" type="String">AIRPORT_CHN_NM</condition>
</conditions>
<results>
<result name="代码" type="String">AIRPORT_IATA_CD</result>
<result name="中文名" type="String">AIRPORT_ENG_NM</result>
<result name="英文名" type="String">AIRPORT_CHN_NM</result>
</results>
</search>

</searchs>

新建一个servlet,取名为TestPopConfigServlet,这里要修改其在web.xml文件中注册的内容.
如下:
<servlet>
<servlet-name>TestPopConfigServlet</servlet-name>
<servlet-class>com.icss.caac.pnrdest.servlet.TestPopConfigServlet</servlet-class>
<init-param>
<param-name>TestConfigXmlName</param-name>
<param-value>TestConfig.xml</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
</servlet>
其中TestConfig.xml是解析的xml文件名,将映射到一个名字TestConfigXmlName,以方便在servlet中取到文件的名字.

然后就是编写servlet的内容: (注意,在调用jdom包的类之前需要把这个包导入到工程,主要逻辑在cXmlToMap(String path)函数中实现.)

package com.icss.caac.pnrdest.servlet;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;

import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;

import com.icss.common.logging.Log;
import com.icss.common.logging.LogFactory;
import com.icss.common.util.Constants;

public class TestPopConfigServlet extends HttpServlet {

private static Log log = LogFactory.getLog(Constants.COMMON_CONFIGKEY,TestPopConfigServlet.class);

/**
* Constructor of the object.
*/
public TestPopConfigServlet() {
super();
}

/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy();
}

public void init() throws ServletException {
String path = getServletContext().getRealPath("/");
String fileName =getInitParameter("TestConfigXmlName");
String filePath=path+"WEB-INF//classes//"+fileName;
Map map=cXmlToMap(filePath);
getServletContext().setAttribute("map",map);
log.debug("加载查询配置成功!!!");
}

private Map cXmlToMap(String path){
SAXBuilder sb = new SAXBuilder();
Document document=null;
Element element=null;
String table=null;
String name=null;
String type=null;
String content=null;
String searchType=null;
List valueList=new ArrayList();
List conditionList=new ArrayList();
List resultList=new ArrayList();
List list=new ArrayList();
Iterator it=null;
Map map=new HashMap();

try {
document = sb.build(path);
} catch (JDOMException e) {
} catch (IOException e) {
}
Element rootElement = document.getRootElement();
Iterator searchIt= rootElement.getChildren("search").iterator();
while(searchIt.hasNext()){
element=(Element) searchIt.next();
//查询类型
searchType=element.getAttributeValue("type");
//读取操作的表
table=element.getChild("table").getText();
//循环读取查询条件
it=element.getChild("conditions").getChildren("condition").iterator();
while(it.hasNext()){
name=((Element)it.next()).getAttributeValue("name");
type=((Element)it.next()).getAttributeValue("type");
content=((Element)it.next()).getText();
list.add(name);
list.add(type);
list.add(content);
conditionList.add(list);
}
//循环读取查询条件
it=element.getChild("results").getChildren("result").iterator();
while(it.hasNext()){
name=((Element)it.next()).getAttributeValue("name");
type=((Element)it.next()).getAttributeValue("type");
content=((Element)it.next()).getText();
list.add(name);
list.add(type);
list.add(content);
resultList.add(list);
}
valueList.add(table);
valueList.add(conditionList);
valueList.add(resultList);
map.put(searchType,valueList);
}
return map;
}

}

启动tomcat服务器后,则会调用此servlet自动解析TestConfig.xml文件.