用Applet读写XML配置文件

王朝java/jsp·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

此小程序用DOM来读取XML文件,用DOM4j来写XML文件。

DOM4j下载地址:http://sourceforge.net/projects/dom4j

1、Applet主程序mainFrame.java

package frame;

/**

* @author wls

*/

import java.applet.*;

import java.awt.*;

import java.awt.event.*;

public class mainFrame

extends Applet {

DomXml domxml = new DomXml();

Button btnExit = new Button("Exit");

Button btnRun = new Button("Save");

Label lblMain = new Label("dynamicroute.xml配置文件");

Label lblSiteinfo = new Label("srcserverid:");

Label lblPath = new Label("destserverid:");

Label lblFilename = new Label("switchserver:");

Label lblSession = new Label("metric:");

Label lblSuccess = new Label(" ");

TextField txtSiteinfo = new TextField(domxml.getSrcserverid(), 10);

TextField txtPath = new TextField(domxml.getDestserverid(), 10);

TextField txtFilename = new TextField(domxml.getSwitchserver(), 10);

TextField txtSession = new TextField(domxml.getMetric(), 10);

Panel p6 = new Panel();

Panel p1 = new Panel();

Panel p2 = new Panel();

Panel p3 = new Panel();

Panel p4 = new Panel();

Panel p5 = new Panel();

Panel p7 = new Panel();

Panel p8 = new Panel();

public void init() {

resize(400, 300);

p6.add(lblMain);

p1.add(lblSiteinfo);

p1.add(txtSiteinfo);

p2.add(lblPath);

p2.add(txtPath);

p3.add(lblSession);

p3.add(txtSession);

p4.add(btnRun);

p4.add(btnExit);

p5.add(lblFilename);

p5.add(txtFilename);

p8.add(lblSuccess);

setLayout(new GridLayout(4, 2, 1, 1));

add(p6);

add(p7);

add(p1);

add(p2);

add(p5);

add(p3);

add(p4);

add(p8);

}

public boolean action(Event evt, Object obj) {

if (evt.target instanceof Button) {

String btnName = (String) obj;

if (btnName.equals("Save")) {

try {

domxml.setSrcserverid(txtSiteinfo.getText());

domxml.setDestserverid(txtPath.getText());

domxml.setSwitchserver(txtFilename.getText());

domxml.setMetric(txtSession.getText());

buildXml buildxml = new buildXml();

if (buildxml.createXMLFile("dynamicroute.xml", domxml) == 1 &&

buildxml.formatXMLFile("dynamicroute.xml")==1) {

lblSuccess.setText("Save success!");

System.out.println("Save success!");

}

}

catch (Exception e) {

e.printStackTrace();

}

}

else if (btnName.equals("Exit")) {

System.exit(0);

}

}

return super.action(evt, obj);

}

public static void main(String args[]) {

new FrameDownload(new mainFrame());

}

}

class FrameDownload

extends Frame {

public FrameDownload(Applet applet) {

setSize(400, 300);

add("Center", applet);

applet.init();

setVisible(true);

this.addWindowListener(new closeWindows());

}

}

class closeWindows

extends WindowAdapter {

public void windowClosing(WindowEvent e) {

Frame frm = (Frame) (e.getSource());

frm.dispose();

System.exit(0);

}

}

2、读取XML类DomXml.java

package frame;

import javax.xml.parsers.*;

import org.w3c.dom.*;

/*

* Created on 2004-8-19

* @author wls

*java读取XML文档

*利用DoM来读取一个XML文档的内容

*

*/

public class DomXml {

private String srcserverid;

private String destserverid;

private String switchserver;

private String metric;

public DomXml() {

try {

initXml("dynamicroute.xml");

}

catch (Exception ex) {

metric="0";

}

}

public String getSrcserverid() {

return srcserverid;

}

public void setSrcserverid(String srcserverid) {

this.srcserverid = srcserverid;

}

public String getDestserverid() {

return destserverid;

}

public void setDestserverid(String destserverid) {

this.destserverid = destserverid;

}

public String getSwitchserver() {

return switchserver;

}

public void setSwitchserver(String switchserver) {

this.switchserver = switchserver;

}

public String getMetric() {

return metric;

}

public void setMetric(String metric) {

this.metric = metric;

}

public void initXml(String fileName) throws Exception {

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

DocumentBuilder bulider = factory.newDocumentBuilder();

Document doc = bulider.parse(fileName);

NodeList nl = doc.getElementsByTagName("dynamicroute");

for (int i = 0; i < nl.getLength(); i++) {

Element node = (Element) nl.item(i);

srcserverid = node.getElementsByTagName("srcserverid").item(0).

getFirstChild().getNodeValue().trim();

destserverid = node.getElementsByTagName("destserverid").item(0).

getFirstChild().getNodeValue().trim();

switchserver = node.getElementsByTagName("serverid").item(0).

getFirstChild().getNodeValue().trim();

metric = node.getElementsByTagName("metric").item(0).getFirstChild().

getNodeValue().trim();

}

}

}

3、写XML文件类buildXml.java

package frame;

import java.io.*;

import org.dom4j.*;

import org.dom4j.io.*;

/**

* @author wls

*/

public class buildXml {

public buildXml() {

}

/**

* 建立一个XML文档,文档名由输入参数决定

* @param filename 需建立的文件名

* @return 返回操作结果, 0表失败, 1表成功

*/

public int createXMLFile(String filename, DomXml domxml) {

/** 返回操作结果, 0表失败, 1表成功 */

int returnValue = 0;

/** 建立document对象 */

Document document = DocumentHelper.createDocument();

/** 建立XML文档的根route */

Element routeElement = document.addElement("route");

/** 加入第一个dynamicroute节点 */

Element dynamicrouteElement = routeElement.addElement("dynamicroute");

/** 加入show参数内容 */

//bookElement.addAttribute("show","yes");

/** 加入节点 */

Element srcserveridElement = dynamicrouteElement.addElement("srcserverid");

Element destserveridElement = dynamicrouteElement.addElement("destserverid");

Element switchserverElement = dynamicrouteElement.addElement("switchserver");

Element serveridElement = switchserverElement.addElement("serverid");

Element metricElement = dynamicrouteElement.addElement("metric");

/** 为title设置内容 */

srcserveridElement.setText(domxml.getSrcserverid());

destserveridElement.setText(domxml.getDestserverid());

serveridElement.setText(domxml.getSwitchserver());

metricElement.setText(domxml.getMetric());

try {

/** 将document中的内容写入文件中 */

XMLWriter writer = new XMLWriter(new FileWriter(new File(filename)));

writer.write(document);

writer.close();

/** 执行成功,需返回1 */

returnValue = 1;

}

catch (Exception ex) {

ex.printStackTrace();

}

return returnValue;

}

/**

* 格式化XML文档,并解决中文问题

* @param filename

* @return

*/

public int formatXMLFile(String filename) {

int returnValue = 0;

try {

SAXReader saxReader = new SAXReader();

Document document = saxReader.read(new File(filename));

XMLWriter output = null;

/** 格式化输出,类型IE浏览一样 */

OutputFormat format = OutputFormat.createPrettyPrint();

/** 指定XML字符集编码 */

format.setEncoding("UTF-8");

output = new XMLWriter(new FileWriter(new File(filename)), format);

output.write(document);

output.close();

/** 执行成功,需返回1 */

returnValue = 1;

}

catch (Exception ex) {

ex.printStackTrace();

}

return returnValue;

}

}

 
 
 
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