用Applet读写XML配置文件

Question

1. 此小程序用DOM来读取XML文件，用DOM4j来写XML文件。
2. DOM4j下载地址：http://sourceforge.net/projects/dom4j
3. 1、Applet主程序mainFrame.java
5. package frame;
7. /**
8. * @author wls
10. */
11. import java.applet.*;
13. import java.awt.*;
14. import java.awt.event.*;
16. public class mainFrame
17. extends Applet {
18. DomXml domxml = new DomXml();
19. Button btnExit = new Button("Exit");
20. Button btnRun = new Button("Save");
21. Label lblMain = new Label("dynamicroute.xml配置文件");
22. Label lblSiteinfo = new Label("srcserverid:");
23. Label lblPath = new Label("destserverid:");
24. Label lblFilename = new Label("switchserver:");
25. Label lblSession = new Label("metric:");
26. Label lblSuccess = new Label(" ");
28. TextField txtSiteinfo = new TextField(domxml.getSrcserverid(), 10);
29. TextField txtPath = new TextField(domxml.getDestserverid(), 10);
30. TextField txtFilename = new TextField(domxml.getSwitchserver(), 10);
31. TextField txtSession = new TextField(domxml.getMetric(), 10);
33. Panel p6 = new Panel();
34. Panel p1 = new Panel();
35. Panel p2 = new Panel();
36. Panel p3 = new Panel();
37. Panel p4 = new Panel();
38. Panel p5 = new Panel();
39. Panel p7 = new Panel();
40. Panel p8 = new Panel();
41. public void init() {
42. resize(400, 300);
43. p6.add(lblMain);
44. p1.add(lblSiteinfo);
45. p1.add(txtSiteinfo);
46. p2.add(lblPath);
47. p2.add(txtPath);
48. p3.add(lblSession);
49. p3.add(txtSession);
50. p4.add(btnRun);
51. p4.add(btnExit);
52. p5.add(lblFilename);
53. p5.add(txtFilename);
54. p8.add(lblSuccess);
55. setLayout(new GridLayout(4, 2, 1, 1));
56. add(p6);
57. add(p7);
58. add(p1);
59. add(p2);
60. add(p5);
61. add(p3);
62. add(p4);
63. add(p8);
64. }
66. public boolean action(Event evt, Object obj) {
67. if (evt.target instanceof Button) {
68. String btnName = (String) obj;
69. if (btnName.equals("Save")) {
70. try {
71. domxml.setSrcserverid(txtSiteinfo.getText());
72. domxml.setDestserverid(txtPath.getText());
73. domxml.setSwitchserver(txtFilename.getText());
74. domxml.setMetric(txtSession.getText());
75. buildXml buildxml = new buildXml();
76. if (buildxml.createXMLFile("dynamicroute.xml", domxml) == 1 &&
77. buildxml.formatXMLFile("dynamicroute.xml")==1) {
78. lblSuccess.setText("Save success!");
79. System.out.println("Save success!");
80. }
81. }
82. catch (Exception e) {
83. e.printStackTrace();
84. }
85. }
86. else if (btnName.equals("Exit")) {
87. System.exit(0);
88. }
89. }
90. return super.action(evt, obj);
91. }
93. public static void main(String args[]) {
94. new FrameDownload(new mainFrame());
95. }
96. }
98. class FrameDownload
99. extends Frame {
100. public FrameDownload(Applet applet) {
101. setSize(400, 300);
102. add("Center", applet);
103. applet.init();
104. setVisible(true);
105. this.addWindowListener(new closeWindows());
106. }
107. }
109. class closeWindows
110. extends WindowAdapter {
111. public void windowClosing(WindowEvent e) {
112. Frame frm = (Frame) (e.getSource());
113. frm.dispose();
114. System.exit(0);
115. }
116. }
118. 2、读取XML类DomXml.java
120. package frame;
122. import javax.xml.parsers.*;
123. import org.w3c.dom.*;
125. /*
126. * Created on 2004-8-19
127. * @author wls
128. *java读取XML文档
129. *利用DoM来读取一个XML文档的内容
130. *
131. */
133. public class DomXml {
134. private String srcserverid;
135. private String destserverid;
136. private String switchserver;
137. private String metric;
138. public DomXml() {
139. try {
140. initXml("dynamicroute.xml");
141. }
142. catch (Exception ex) {
143. metric="0";
144. }
145. }
147. public String getSrcserverid() {
148. return srcserverid;
149. }
151. public void setSrcserverid(String srcserverid) {
152. this.srcserverid = srcserverid;
153. }
155. public String getDestserverid() {
156. return destserverid;
157. }
159. public void setDestserverid(String destserverid) {
160. this.destserverid = destserverid;
161. }
163. public String getSwitchserver() {
164. return switchserver;
165. }
167. public void setSwitchserver(String switchserver) {
168. this.switchserver = switchserver;
169. }
171. public String getMetric() {
172. return metric;
173. }
175. public void setMetric(String metric) {
176. this.metric = metric;
177. }
179. public void initXml(String fileName) throws Exception {
180. DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
181. DocumentBuilder bulider = factory.newDocumentBuilder();
182. Document doc = bulider.parse(fileName);
183. NodeList nl = doc.getElementsByTagName("dynamicroute");
185. for (int i = 0; i < nl.getLength(); i++) {
187. Element node = (Element) nl.item(i);
188. srcserverid = node.getElementsByTagName("srcserverid").item(0).
189. getFirstChild().getNodeValue().trim();
190. destserverid = node.getElementsByTagName("destserverid").item(0).
191. getFirstChild().getNodeValue().trim();
192. switchserver = node.getElementsByTagName("serverid").item(0).
193. getFirstChild().getNodeValue().trim();
194. metric = node.getElementsByTagName("metric").item(0).getFirstChild().
195. getNodeValue().trim();
196. }
197. }
199. }
201. 3、写XML文件类buildXml.java
202. package frame;
204. import java.io.*;
206. import org.dom4j.*;
207. import org.dom4j.io.*;
209. /**
210. * @author wls
212. */
214. public class buildXml {
216. public buildXml() {
218. }
220. /**
221. * 建立一个XML文档,文档名由输入参数决定
223. * @param filename 需建立的文件名
225. * @return 返回操作结果, 0表失败, 1表成功
227. */
229. public int createXMLFile(String filename, DomXml domxml) {
231. /** 返回操作结果, 0表失败, 1表成功 */
233. int returnValue = 0;
235. /** 建立document对象 */
236. Document document = DocumentHelper.createDocument();
237. /** 建立XML文档的根route */
238. Element routeElement = document.addElement("route");
239. /** 加入第一个dynamicroute节点 */
240. Element dynamicrouteElement = routeElement.addElement("dynamicroute");
241. /** 加入show参数内容 */
242. //bookElement.addAttribute("show","yes");
243. /** 加入节点 */
244. Element srcserveridElement = dynamicrouteElement.addElement("srcserverid");
245. Element destserveridElement = dynamicrouteElement.addElement("destserverid");
246. Element switchserverElement = dynamicrouteElement.addElement("switchserver");
247. Element serveridElement = switchserverElement.addElement("serverid");
248. Element metricElement = dynamicrouteElement.addElement("metric");
249. /** 为title设置内容 */
250. srcserveridElement.setText(domxml.getSrcserverid());
251. destserveridElement.setText(domxml.getDestserverid());
252. serveridElement.setText(domxml.getSwitchserver());
253. metricElement.setText(domxml.getMetric());
254. try {
255. /** 将document中的内容写入文件中 */
256. XMLWriter writer = new XMLWriter(new FileWriter(new File(filename)));
257. writer.write(document);
258. writer.close();
259. /** 执行成功,需返回1 */
260. returnValue = 1;
261. }
262. catch (Exception ex) {
263. ex.printStackTrace();
264. }
265. return returnValue;
266. }
268. /**
269. * 格式化XML文档,并解决中文问题
271. * @param filename
273. * @return
275. */
277. public int formatXMLFile(String filename) {
279. int returnValue = 0;
281. try {
283. SAXReader saxReader = new SAXReader();
285. Document document = saxReader.read(new File(filename));
287. XMLWriter output = null;
289. /** 格式化输出,类型IE浏览一样 */
291. OutputFormat format = OutputFormat.createPrettyPrint();
293. /** 指定XML字符集编码 */
295. format.setEncoding("UTF-8");
297. output = new XMLWriter(new FileWriter(new File(filename)), format);
299. output.write(document);
301. output.close();
303. /** 执行成功,需返回1 */
305. returnValue = 1;
307. }
308. catch (Exception ex) {
310. ex.printStackTrace();
312. }
314. return returnValue;
316. }
318. }

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