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>