jsp静态化之简单介绍
package com.zwd.text;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Date;
public class Test {
private static long star = 0;
private static long end = 0;
private static long ttime = 0;
// 返回 html 代码
public static String getHtmlCode(String httpUrl) {
Date before = new Date();
star = before.getTime();
StringBuffer htmlCode = new StringBuffer(); //这里我做了改动,原文是用String,这样内存消耗会太大,原因我就不说了
try {
InputStream in;
URL url = new java.net.URL(httpUrl);
HttpURLConnection connection = (HttpURLConnection) url.openConnection(); //抽象连接
connection = (HttpURLConnection) url.openConnection();
connection.setRequestProperty("User-Agent", "Mozilla/ 4.0");//这句很重要，预防服务器拦截我们java程序的请求,如果少了就会被弹403等错误。
connection.connect();
//连接部分完成
//======================= 华丽分界线 =================
//io读写开始
in = connection.getInputStream();
java.io.BufferedReader breader = new BufferedReader(new InputStreamReader(in, "UTF-8"));
String currentLine;
while ((currentLine = breader.readLine()) != null) { //以行的方式读取
htmlCode.append(currentLine);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
//计算时耗
Date after = new Date();
end = after.getTime();
ttime = end - star;
System.out.println(" 执行时间 :" + ttime + " 毫秒 ");
}
return htmlCode.toString();
}
// 存储文件 这里就做详细解释了,就是把上文获取的内容保存到指定文件而已
public static synchronized void writeHtml(String filePath, String info, String flag) {
PrintWriter pw = null;
try {
File writeFile = new File(filePath);
boolean isExit = writeFile.exists();
if (isExit != true) {
writeFile.createNewFile();
} else {
if (!flag.equals("NO")) {
writeFile.delete();
writeFile.createNewFile();
}
}
pw = new PrintWriter(new FileOutputStream(filePath, true));
pw.println(info);
pw.close();
} catch (Exception ex) {
System.out.println(ex.getMessage());
} finally {
pw.close();
}
}
public static void main(String[] args) {
String url = "http://localhost:8080/online/index.do"; //目标网站
writeHtml("d:/demo.html", getHtmlCode(url), "NO"); //目标网站静态化
}
}
这些代码是我从网上搜来的,其实网上材料很多,本人觉得这个写的是最好的,所以挑他来说下,其实静态化也不难,只是用最常见的方法,对把目标文件下载,或者应该说读取出来而已,
所以关键就在于io流的应用,从代码上看,其实也很简单,我也为大家一一注释下,希望对新手有点帮助,当然后事还没完成,列子只是给大家把怎么把一个页面静态化而已,如果大家想偷懒想容器自动静态化的话,只要配合写一个定时器就行了(定时器我别的文章页介绍了,这里就不多少)
核心部分也就是这样,如果等本人有时间,我再做一个实例,上传上来,提供大家参考吧.时间嘛,待定,呵呵