Posted on 2011-04-10 23:21
penngo 閱讀(2617)
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Java
OSCache支持JSP標簽頁面內緩存、整個頁面的緩存、對象緩存，試用了下OSCache的頁面緩存，并使用JMeter測試。
1、使用的測試頁面代碼test1.jsp
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Filter Test Page</title>
<style type="text/css">
body {font-family: Arial, Verdana, Geneva, Helvetica, sans-serif}
</style>
</head>
<body>
<a href="/OSCache/">返回</a><p>
<hr>
<b>當前時間</b>: 2011-04-09 12:20:07<br>
<b>當前毫秒數</b>: 1302322807867<br>
</body>
</html>
JMeter線程組設置：
運行結果：
2、把文件放在cache/test1.jsp
并在web.xml增加配置：
<filter>
<filter-name>CacheFilter</filter-name>
<filter-class>com.opensymphony.oscache.web.filter.CacheFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>CacheFilter</filter-name>
<url-pattern>/cache/*</url-pattern>
</filter-mapping>
JMeter測試結果
3、把文件放在WEB-INF/template/test1.jsp,并寫一個servlet處理文件先把test1.jsp讀取進內存HashMap，訪問時從這個HashMap中取出test1.jsp的文件內容。
增加一個servlet文件CacheServlet.java
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class CacheServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private static final Map<String, byte[]> cacheMap = new HashMap<String, byte[]>();
protected static final Log log = LogFactory.getLog(CacheServlet.class);
public CacheServlet() {
super();
}
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
cache(request, response);
}
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
cache(request, response);
}
protected void cache(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
String path = request.getSession().getServletContext().getRealPath("")
+ "/WEB-INF/template";
String key = request.getRequestURI(); //從靜態變量中取出頁面
byte[] by = cacheMap.get(key);
if (by != null) { //如果不為空，則直接把文件內容返回給客戶端
byte[] b = new byte[256];
int len = 0;
ServletOutputStream out = response.getOutputStream();
out.write(by);
log.debug("輸出緩存==============\n" );
out.flush();
out.close();
}
else{ //如果為空，則先把文件內容以字節形式保存在靜態變量中，
File f = new File(path + "/test1.jsp");
StringBuffer sr = new StringBuffer();
InputStream in = new FileInputStream(f);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
int len = 0;
byte[] b = new byte[256];
while((len = in.read(b)) > 0){
bos.write(b, 0, len);
}
byte[] sByte = bos.toByteArray();
log.debug("生成緩存:" );
cacheMap.put(key, sByte);
in.close();
bos.close();
ServletOutputStream out = response.getOutputStream();
out.write(sByte);
out.flush();
out.close();
}
}
}
web.xml中增加內容：
<servlet>
<servlet-name>CacheServlet</servlet-name>
<servlet-class>com.ocache.servlet.CacheServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>CacheServlet</servlet-name>
<url-pattern>/CacheServlet</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>10</session-timeout>
</session-config>
先用瀏覽器訪問該sevlet，把頁面內容保存進cacheMap中，再用JMeter測試。
測試結果：
測試發現，服務器本身對靜態內容的處理比緩存還快。而自己寫的servlet緩存比OSCache快，主要是因為OSCache多了內部處理的代碼，至于是哈內部處理，還要看過源碼才知。
本程序的測試環境：
服務器：apache-tomcat-6.0.20
緩存組件：oscache-2.4.1
JDK：jdk1.6.0_17
JMeter:jakarta-jmeter-2.4
測試代碼：
OSCache.zip