java解析xml 工具类

解析xml 工具 做个笔记

1. import java.io.FileInputStream;  
2. import java.io.InputStream;  
3. import java.util.HashMap;  
4. import java.util.List;  
5. import java.util.Map;  
6.   
7. import org.apache.log4j.Logger;  
8. import org.jdom.Attribute;  
9. import org.jdom.Document;  
10. import org.jdom.Element;  
11. import org.jdom.input.SAXBuilder;  
12.   
13. public class XmlUtil {  
14.     private static Logger log = Logger.getLogger(XmlUtil.class);  
15.       
16.     public final static String DEFAULT_ID_KEY = "defalut";  
17.       
18.     public final static String ID = "id";  
19.       
20.     /** 
21.      * 初始化 filePath 指定的 XML 文件 
22.      *  
23.      * @param filePath 
24.      * @return 
25.      * @throws Exception 
26.      */  
27.     public static Map<String,Map<String,String>> loadXml(String filePath) throws Exception {  
28.         return loadXml(new FileInputStream(filePath));  
29.     }  
30.       
31.     /** 
32.      * 初始化 InputStream 指定的 XML 输入流 
33.      *  
34.      * @param in 
35.      * @return 
36.      * @throws Exception 
37.      */  
38.     public static Map<String,Map<String,String>> loadXml(InputStream in) throws Exception {  
39.         Map<String,Map<String,String>> configMap = new HashMap<String,Map<String,String>>();  
40.         try {  
41.             SAXBuilder sb = new SAXBuilder();  
42.             Document doc = sb.build(in);  
43.             Element root = doc.getRootElement();  
44.             List rootList = root.getChildren();  
45.             for (int i = 0; i < rootList.size(); i++) {  
46.                 Element rootEle = (Element) rootList.get(i);  
47.                 List childList = rootEle.getChildren();  
48.                 if (childList != null && childList.size() > 0) {  
49.                     Attribute attribute = rootEle.getAttribute(ID);  
50.                     String idValue = null;  
51.                     if (attribute == null) {  
52.                         idValue = DEFAULT_ID_KEY;  
53.                     } else {  
54.                         idValue = attribute.getValue();  
55.                     }  
56.                     if (idValue == null || "".equals(idValue)) {  
57.                         idValue = DEFAULT_ID_KEY;  
58.                     }  
59.                     Map<String,String> itemMap = null;  
60.                     if (configMap.containsKey(idValue)) { // 如果已经存在 Map  
61.                         itemMap = configMap.get(idValue);  
62.                     } else { // 如果不存在就新建  
63.                         itemMap = new HashMap<String,String>();  
64.                         configMap.put(idValue, itemMap);  
65.                     }  
66.                     for (int j = 0; j < childList.size(); j++) {  
67.                         Element childEle = (Element) childList.get(j);  
68.                         Attribute childAttribute = childEle.getAttribute(ID);                         
69.                         String idKey = null;  
70.                         if (childAttribute == null) {  
71.                             idKey = DEFAULT_ID_KEY;  
72.                         } else {  
73.                             idKey = childAttribute.getValue();  
74.                         }  
75.                         itemMap.put(idKey, childEle.getText());  
76.                     }  
77.                       
78.                       
79.                 }  
80.             }  
81.             log.info("初始化 XML 配置文件成功");  
82.         } catch (Exception ex) {  
83.             log.error("初始化 XML 配置文件失败，原因：" + ex);  
84.             throw ex;  
85.         }  
86.         return configMap;  
87.     }  
88. }