Digester快速解析XML数据

Digester快速解析XML数据

使用到了org.apache.commons.digester.Digester
一些配置和一些字典型的数据，用XML的形式存放在classpath里面，比较方便，开发也比较快速。

先看看要解析的XML文件helpContent_data.xml：
<helpColumn>
<!-- 首页 -->
<helpContent pageUrl="index.jsp" pageCode="1" linkUrl="#" title="如何注册？" desn="首页。&lt;br />2) 点击“注册”" />
<helpContent pageUrl="index.jsp" pageCode="1" linkUrl="#" title="如何添加新设备？" desn="添加新设备成功。" />
<helpContent pageUrl="index.jsp" pageCode="1" linkUrl="#" title="如何实现设备报警？" desn="进入“报警配置”编辑。" />
<helpContent pageUrl="index.jsp" pageCode="1" linkUrl="#" title="如何进入用户管理系统？" desn="进入“系统”" />
<helpContent pageUrl="index.jsp" pageCode="1" linkUrl="#" title="提供哪些服务？如何申请服务？" desn="点击“服务”" />
</helpColumn>

就是一个符合XML规范的XML文件。

另外定义了两个DO来对应helpColumn根和helpContent元素
HelpContent.java如下：
package com.megaeyes.ipcamera.dao.model;

public class HelpContent {
private Integer id;
private String pageUrl;
private String pageCode;
private String linkUrl;
private String title;
private String desn;
}

就是一个纯净的POJO。对应了XML里面helpContent的每一个元素。

HelpColumn.java如下：
package com.megaeyes.ipcamera.dao.model;

import java.util.ArrayList;
import java.util.List;

public class HelpColumn {
private String name;
List helpContents = new ArrayList();
public void addHelpContent(HelpContent helpContent) {
   helpContents.add(helpContent);
}
public List getHelpContents() {
   return helpContents;
}
public String getName() {
   return name;
}
public void setName(String name) {
   this.name = name;
}
}

数据和存放数据的类都准备好了，下面就是解析XML的实现类了，XmlSaxManagerImpl.java:

package com.megaeyes.ipcamera.service.impl;

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

import org.apache.commons.digester.Digester;
import org.xml.sax.SAXException;

import com.megaeyes.ipcamera.dao.model.HelpColumn;
import com.megaeyes.ipcamera.dao.model.HelpContent;
import com.megaeyes.ipcamera.service.iface.XmlSaxManager;

public class XmlSaxManagerImpl extends BaseManager implements XmlSaxManager {

private static final String isConfigFile = "helpContent_data.xml";

private HelpColumn helpColumn;

public void init() {
   Digester digester = new Digester();
   digester.setValidating(false);
   digester.addObjectCreate("helpColumn",
     "com.megaeyes.ipcamera.dao.model.HelpColumn");
   digester.addSetProperties("helpColumn");
   digester.addObjectCreate("helpColumn/helpContent",
     "com.megaeyes.ipcamera.dao.model.HelpContent");
   digester.addSetProperties("helpColumn/helpContent");
   digester.addSetNext("helpColumn/helpContent", "addHelpContent",
     "com.megaeyes.ipcamera.dao.model.HelpContent");
   try {
    InputStream in = this.getClass()
    .getClassLoader().getResourceAsStream(isConfigFile);
    // 采用classloader的方式，把xml文件放classpath里面就可以读到
    helpColumn = (HelpColumn) digester.parse(in);
   } catch (IOException ioe) {
    ioe.printStackTrace();
   } catch (SAXException se) {
    se.printStackTrace();
   }
}

public HelpColumn getHelpColumn() {
   return helpColumn;
}

public List getHelpContents(String pageCode) {
   List reList = null;
   if (helpColumn != null && helpColumn.getHelpContents() != null
     && !helpColumn.getHelpContents().isEmpty()) {
    reList = new ArrayList();
    for (int i = 0; i < helpColumn.getHelpContents().size(); i++) {
     HelpContent content = (HelpContent) helpColumn
       .getHelpContents().get(i);
     reList.add(content);
    }
   }
   return reList;
}

public static void main(String[] args) {
   XmlSaxManagerImpl impl = new XmlSaxManagerImpl();
   impl.init();
   List list = impl.getHelpContents("1");
   for(int i = 0;i<list.size();i++){
    HelpContent content = (HelpContent)list.get(i);
    System.out.println(content.getTitle());
    System.out.println(content.getDesn());
   }
}

}