users.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 3 <xml-root> 4 <conn-params> 5 <conn-url>jdbc:mysql://192.168.101.7:3306/bbs</conn-url> 6 <conn-driver>com.mysql.jdbc.Driver</conn-driver> 7 <conn-username>root</conn-username> 8 <conn-password>root</conn-password> 9 </conn-params> 10 11 <person xmlns:u="http://example.org/user"> 12 <u:user> 13 <u:username>xzc</u:username> 14 <u:password>sdf23223</u:password> 15 <u:birthday>2012-01-23</u:birthday> 16 </u:user> 17 <u:user> 18 <u:username>误闯</u:username> 19 <u:password>wuchuang3223</u:password> 20 <u:birthday>2002-01-03</u:birthday> 21 </u:user> 22 </person> 23 </xml-root>
采用DOM api 解析XML
1. User类
1 public class User {
2
3 private String username;
4 private String password;
5 private String birthday;
6
7 public String toString() {
8 return "username = " + username + ", password = " + password + ", birthday = " + birthday;
9 }
//省略setter,getter
10 }
2. DomUtil解析类
1 package sax.parsing.user;
2
3 import java.io.FileInputStream;
4 import java.util.ArrayList;
5 import java.util.List;
6
7 import javax.xml.parsers.DocumentBuilder;
8 import javax.xml.parsers.DocumentBuilderFactory;
9 import javax.xml.parsers.ParserConfigurationException;
10
11 import org.w3c.dom.Document;
12 import org.w3c.dom.Element;
13 import org.w3c.dom.Node;
14 import org.w3c.dom.NodeList;
15 import org.xml.sax.InputSource;
16
17 public class DomUtil {
18
19
20 private DocumentBuilderFactory builderFactory;
21 private DocumentBuilder builder;
22 private Document document;
23
24 public DomUtil() throws ParserConfigurationException {
25 builderFactory = DocumentBuilderFactory.newInstance();
26 builder = builderFactory.newDocumentBuilder();
27 }
28
29 public DocumentBuilderFactory getBuilderFactory() {
30 return builderFactory;
31 }
32 public DocumentBuilder getBuilder() {
33 return builder;
34 }
35
36 public List<User> parseXml(String filepath) throws Exception {
37
38 document = builder.parse(new InputSource(new FileInputStream(filepath)));
39
40
41 List<User> list = new ArrayList<User>();
42
43 Element root = document.getDocumentElement(); //从文档根节点获取文档根元素节点root => xml
44 NodeList childNodes = root.getChildNodes();
45
46 for (int i=0; i<childNodes.getLength(); i++) {
47 Node node = childNodes.item(i);
48
49 /*
50 * <person>
51 <user>
52 <username>xzc</username>
53 <password>sdf23223</password>
54 <birthday>2012-01-23</birthday>
55 </user>
56 <user>
57 <username>误闯</username>
58 <password>wuchuang3223</password>
59 <birthday>2002-01-03</birthday>
60 </user>
61 </person>
62 */
63 if ("person".equals(node.getNodeName())) {
64
65 NodeList pChildNodes = node.getChildNodes();
66
67 for (int t=0; t<pChildNodes.getLength(); t++) {
68
69 Node nd = pChildNodes.item(t);
70
71 if (nd.getNodeType() == Node.ELEMENT_NODE && nd.getNodeName().equals("user")) {
72
73 User user = new User();
74
75 NodeList userChildNodes = nd.getChildNodes();
76
77 for (int k=0; k<userChildNodes.getLength(); k++) {
78 Node userNode = userChildNodes.item(k);
79 String nodeName = userNode.getNodeName();
80 String nodeValue = userNode.getTextContent();
81 System.out.println("nodeType=" + userNode.getNodeType() + ", nodeName=" + nodeName + ", nodeValue=" + nodeValue);
82
83
84 if ("username".equals(nodeName))
85 user.setUsername(nodeValue);
86 if ("password".equals(nodeName))
87 user.setPassword(nodeValue);
88 if ("birthday".equals(nodeName))
89 user.setBirthday(nodeValue);
90 }
91 list.add(user);
92 } // 若当前节点是user
93 }
94 } // 若当前元素是person的处理逻辑
95 }// 完成对根元素的所有子节点的判断
96
97 return list;
98 }
99
100
101 public static void main(String[] args) {
102
103 try {
104 DomUtil domUtil = new DomUtil();
105 List<User> users = domUtil.parseXml("src/sax/parsing/user/jdbc-params.xml");
106
107 for(User user : users) {
108 System.out.println(user);
109 }
110 } catch (ParserConfigurationException e) {
111 e.printStackTrace();
112 } catch (Exception e) {
113 // TODO Auto-generated catch block
114 e.printStackTrace();
115 }
116 }
117 }
输出结果：
nodeType=3, nodeName=#text, nodeValue= ###此处是Text节点的值（换行+3个制表符）
nodeType=1, nodeName=username, nodeValue=xzc
nodeType=3, nodeName=#text, nodeValue=
nodeType=1, nodeName=password, nodeValue=sdf23223
nodeType=3, nodeName=#text, nodeValue=
nodeType=1, nodeName=birthday, nodeValue=2012-01-23
nodeType=3, nodeName=#text, nodeValue=
nodeType=3, nodeName=#text, nodeValue=
nodeType=1, nodeName=username, nodeValue=误闯
nodeType=3, nodeName=#text, nodeValue=
nodeType=1, nodeName=password, nodeValue=wuchuang3223
nodeType=3, nodeName=#text, nodeValue=
nodeType=1, nodeName=birthday, nodeValue=2002-01-03
nodeType=3, nodeName=#text, nodeValue=
username = xzc, password = sdf23223, birthday = 2012-01-23
username = 误闯, password = wuchuang3223, birthday = 2002-01-03
采用SAX解析XML文件内容到User对象
1 package sax.parsing.user;
2
3 import java.io.File;
4 import java.io.IOException;
5 import java.util.ArrayList;
6 import java.util.List;
7
8 import javax.xml.parsers.ParserConfigurationException;
9 import javax.xml.parsers.SAXParser;
10 import javax.xml.parsers.SAXParserFactory;
11
12 import org.xml.sax.Attributes;
13 import org.xml.sax.SAXException;
14 import org.xml.sax.helpers.DefaultHandler;
15
16 public class SaxUtil extends DefaultHandler {
17
18
19 private List<User> users = new ArrayList<User>();
20 private User user;
21 private String content;
22
23 @Override
24 public void characters(char [] ch, int start, int length) throws SAXException {
25 content = new String(ch, start, length);
26 }
27
28 /**
29 * xmlns:prefix=uri
30 * qName, prefix:localName
31 * @param uri
32 * The Namespace URI, or the empty string if the element has no Namespace URI
33 * or if Namespaceprocessing is not being performed.
34 * 如果元素没有命名空间URI、命名空间处理未被开启，则为空字符串
35 * @param localName
36 * The local name (without prefix),
37 * or the empty string if Namespace processing is not being performed.
38 * 不带前缀的本地名，如果命名空间处理未被开启，则为空字符串
39 * @param qName
40 * The qualified name (with prefix),
41 * or the empty string if qualified names are not available.
42 * 带前缀的全限定名，如果限定名不可得到，则为空串
43 * @param attributes
44 * The attributes attached to the element.
45 * If there are no attributes, it shall be an empty Attributes object.
46 * 附加在该元素上的属性，如果元素没有属性，则为空的Attributes对象
47 */
48 @Override
49 public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
50
51 if ("user".equals(localName)) {
52 user = new User();
53 System.out.println("### " + localName);
54 System.out.println("<" + qName + ">");
55 }
57 }
58
59 @Override
60 public void endElement(String uri, String localName, String qName) throws SAXException {
61
62 if ("username".equals(localName))
63 user.setUsername(content);
64
65 if ("password".equals(localName))
66 user.setPassword(content);
67
68 if ("birthday".equals(localName))
69 user.setBirthday(content);
70
71 if ("user".equals(localName))
72 users.add(user);
73 }
74
75
76
77 public List<User> getUsers() {
78 return users;
79 }
80
81
82 public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {
83
84 SAXParserFactory parserFactory = SAXParserFactory.newInstance();
85 parserFactory.setNamespaceAware(true); //设置启用命名空间，这样localName才可用
86 SAXParser parser = parserFactory.newSAXParser();
87
88 SaxUtil saxUtil = new SaxUtil();
89
90 parser.parse(new File("src/sax/parsing/user/jdbc-params.xml"), saxUtil);
91 List<User> userlist = saxUtil.getUsers();
92
93 for (User user : userlist)
94 System.out.println(user);
95 }
96
97 }
输出结果：
### user
<u:user>
### user
<u:user>
username = xzc, password = sdf23223, birthday = 2012-01-23
username = 误闯, password = wuchuang3223, birthday = 2002-01-03
该实验例子摘自： http://toreking.iteye.com/blog/1669645
时间： 2024-10-07 05:32:20