高性能 java web页面静态化使用httpclient生成静态页面

package com.wwxl.util; 
 
import java.io.*; 

import org.apache.commons.httpclient.*; 
import org.apache.commons.httpclient.methods.*; 
import org.apache.commons.httpclient.params.HttpMethodParams; 
import org.apache.log4j.Logger;
 
/**
 * 静态页面引擎技术
 * @author 邓文伟
 *
 */ 
public class HtmlGenerator{ 
    private Logger logger = Logger.getLogger(HtmlGenerator.class);
    HttpClient httpClient = null; //HttpClient实例  
    GetMethod getMethod =null; //GetMethod实例  
    String page = null;
    String webappname = null;
    BufferedWriter fw = 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,"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 page) 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://www.baidu.com","c:/a.html"); 
        System.out.println("静态页面已经生成到c:/a.html"); 
         
    } 
} 

添加pom依赖
               <dependency>
			<groupId>commons-httpclient</groupId>
			<artifactId>commons-httpclient</artifactId>
			<version>3.1</version>
		</dependency>
<!-- log4j -->
  <dependency>
   <groupId>log4j</groupId>
   <artifactId>log4j</artifactId>
   <version>1.2.17</version>
  </dependency>