高性能Java Web 页面静态化技术(原创)

package com.yancms.util;import java.io.*;import org.apache.commons.httpclient.*;import org.apache.commons.httpclient.methods.*;import org.apache.commons.httpclient.params.HttpMethodParams;/** * 静态页面引擎技术（突乱了乱码问题UTF-8） * @author 吴彦文 * */public class HtmlGenerator extends BaseLog {HttpClient httpClient = null; //HttpClient实例GetMethod getMethod =null; //GetMethod实例BufferedWriter fw = null;String page = null;String webappname = null;BufferedReader br = null;InputStream in = null;StringBuffer sb = null;String line = null; //构造方法public HtmlGenerator(String webappname){this.webappname = webappname;}/** 根据模版及参数产生静态页面 */public boolean createHtmlPage(String url,String htmlFileName){boolean status = false;int statusCode = 0;try{//创建一个HttpClient实例充当模拟浏览器httpClient = new HttpClient();//设置httpclient读取内容时使用的字符集httpClient.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET,"UTF-8");//创建GET方法的实例getMethod = new GetMethod(url);//使用系统提供的默认的恢复策略，在发生异常时候将自动重试3次getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler());//设置Get方法提交参数时使用的字符集,以支持中文参数的正常传递getMethod.addRequestHeader("Content-Type","text/html;charset=UTF-8");//执行Get方法并取得返回状态码，200表示正常，其它代码为异常statusCode = httpClient.executeMethod(getMethod);if (statusCode!=200) {logger.fatal("静态页面引擎在解析"+url+"产生静态页面"+htmlFileName+"时出错!");}else{//读取解析结果sb = new StringBuffer();in = getMethod.getResponseBodyAsStream();//br = new BufferedReader(new InputStreamReader(in));//此方法默认会乱码，经过长时期的摸索，下面的方法才可以br = new BufferedReader(new InputStreamReader(in,"UTF-8"));while((line=br.readLine())!=null){sb.append(line+"\n");}if(br!=null)br.close();page = sb.toString();//将页面中的相对路径替换成绝对路径，以确保页面资源正常访问page = formatPage(page);//将解析结果写入指定的静态HTML文件中，实现静态HTML生成writeHtml(htmlFileName,page);status = true;}}catch(Exception ex){logger.fatal("静态页面引擎在解析"+url+"产生静态页面"+htmlFileName+"时出错:"+ex.getMessage());        }finally{        //释放http连接        getMethod.releaseConnection();        }return status;}//将解析结果写入指定的静态HTML文件中private synchronized void writeHtml(String htmlFileName,String content) throws Exception{fw = new BufferedWriter(new FileWriter(htmlFileName));OutputStreamWriter fw = new OutputStreamWriter(new FileOutputStream(htmlFileName),"UTF-8");fw.write(page);if(fw!=null)fw.close();}//将页面中的相对路径替换成绝对路径，以确保页面资源正常访问private String formatPage(String page){page = page.replaceAll("\\.\\./\\.\\./\\.\\./", webappname+"/");page = page.replaceAll("\\.\\./\\.\\./", webappname+"/");page = page.replaceAll("\\.\\./", webappname+"/");return page;}//测试方法public static void main(String[] args){HtmlGenerator h = new HtmlGenerator("webappname");h.createHtmlPage("http://localhost:8080/yanCms/three/three?parent_id=10&id=103&type=10","c:/a.html");System.out.println("静态页面已经生成到c:/a.html");}}