设计模式-----问题一

来源：互联网发布：数据结构出栈算法程序编辑：程序博客网时间：2024/05/23 00:08

==============================================================================

在读取xml时候用了单利模式，里面有一个构造方法的变量赋值问题，如果不加this，是无法进行赋值的

==============================================================================

package com.nusof.xml.tools;

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

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

/**
* 
* 类说明:
* 
*
* @version 1.0
* 
* 文件名： XmlConfigReader.java
* 
* 
* 创建人及时间： zcw 2011-5-4
* 
* 
* 修改人：
* 
* 
* 修改时间：
* 
* 
* 修改描述：
* 
*/

public class XmlConfigReader {

 // (延迟加载懒汉式)
 private static XmlConfigReader instance = null;

 public static synchronized XmlConfigReader getInstance() {
 if (instance == null) {
 instance = new XmlConfigReader();
 }
 return instance;
 }

 // 保存regex配置
 private List<RegexPatternConfig> regexPatternConfigs = new ArrayList<RegexPatternConfig>();

 public List<RegexPatternConfig> getRegexPatternConfigs() {
 return regexPatternConfigs;
 }

 @SuppressWarnings("unchecked")
 public XmlConfigReader() {
 SAXReader reader = new SAXReader();
 InputStream in = Thread.currentThread().getContextClassLoader()
 .getResourceAsStream("ajax-config.xml");
 try {
 Document doc = reader.read(in);

 // 取得regex的配置
 List<RegexPatternConfig> regexPatternConfigs = new ArrayList<RegexPatternConfig>();

 Element websites = doc.getRootElement();
 for (Iterator<Element> it = websites.elementIterator(); it
 .hasNext();) {
 /**
 * id + RegexPatternConfigChild
 */
 RegexPatternConfig regexPatternConfig = new RegexPatternConfig();
 /**
 * 两个正则表达式
 */
 RegexPatternConfigChild regexPatternConfigChild = new RegexPatternConfigChild();
 /**
 * 每个网站
 */
 Element website = it.next();
 /**
 * 网站id
 */
 String websiteId = website.attributeValue("website-id");
 // System.out.println("取得网站id" + websiteId);

 regexPatternConfig.setWebsiteId(Integer.valueOf(websiteId));

 /**
 * 临时变量保存正则表达式
 */
 Regex scriptRegex = new Regex();
 /**
 * ===============================================* script-regex
 * begin ===============================================*
 */
 Element scriptRegexElt = (Element) website
 .selectObject("./script-regex/regex");
 /**
 * script-regex 网页url正则
 */
 String scriptRegexStr = scriptRegexElt.getStringValue();
 /**
 * 组号
 */
 int scriptGroupNo = Integer.valueOf(scriptRegexElt
 .attributeValue("group"));
 /**
 * 匹配模式
 */
 String scriptRunType = scriptRegexElt.attributeValue("run");
 scriptRegex.setRegexStr(scriptRegexStr);
 scriptRegex.setGroup(scriptGroupNo);
 scriptRegex.setType(scriptRunType);
 regexPatternConfigChild.setScriptRegex(scriptRegex);
 // System.out.println(scriptGroupNo);
 // System.out.println(scriptRunType);
 // System.out.println(scriptRegexStr);

 regexPatternConfigChild.setScriptRegex(scriptRegex);

 // ========script-regex end===============

 /**
 * 临时变量保存正则表达式
 */
 Regex hitnumRegex = new Regex();

 /**
 * ===============================================*
 * hits-num-regex begin
 * ===============================================*
 */

 Element hitnumRegexElt = (Element) website
 .selectObject("hits-num-regex/regex");
 /**
 * hitnum-regex 点击数正则
 */
 String hitnumRegexStr = hitnumRegexElt.getStringValue();
 /**
 * 组号
 */
 int hitnumGgroupNo = Integer.valueOf(scriptRegexElt
 .attributeValue("group"));
 /**
 * 匹配模式
 */
 String hitnumRunType = hitnumRegexElt.attributeValue("run");
 hitnumRegex.setRegexStr(hitnumRegexStr);
 hitnumRegex.setGroup(hitnumGgroupNo);
 hitnumRegex.setType(hitnumRunType);
 regexPatternConfigChild.setScriptRegex(hitnumRegex);
 // System.out.println(hitnumGgroupNo);
 // System.out.println(hitnumRunType);
 // System.out.println(hitnumRegexStr);

 regexPatternConfigChild.setHitnumRegex(hitnumRegex);
 // ===============hits-num-regex begin=============

 regexPatternConfig
 .setRegexPatternConfigChild(regexPatternConfigChild);
 /**
 * 添加每个网站点击数的配置this 不能省略
 */
 this.regexPatternConfigs.add(regexPatternConfig);
// regexPatternConfigs.add(regexPatternConfig); 这里如果是不加上this是无法进行添加的
 }

 } catch (DocumentException e) {
 e.printStackTrace();
 }
 }

 public static void main(String[] args) {
 List<RegexPatternConfig> test = XmlConfigReader.getInstance()
 .getRegexPatternConfigs();
 for (RegexPatternConfig rc : test) {
 System.out.println(rc.getWebsiteId());
 System.out.println(rc.getRegexPatternConfigChild().toString());
 }
 }
}