在Tomcat上直接配置GZIP压缩-优快云博客

本文介绍了如何在Tomcat中启用内容压缩，并通过一个简单的HTTP客户端测试程序验证压缩功能的有效性。

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来自：
http://www.javayou.com/html/diary/showlog.vm?sid=2&log_id=3967

tomcat本身在5.0版本以后是支持内容压缩的，它使用的是gzip的压缩格式，我们先来看Tomcat文档中对下面两个配置的注解（红色粗体字部分）

compressableMimeType

The value is a comma separated list of MIME types for which HTTP compression may be used. The default value istext/html,text/xml,text/plain.

compression

The Connector may use HTTP/1.1 GZIP compression in an attempt to save server bandwidth. The acceptable values for the parameter is "off" (disable compression), "on" (allow compression, which causes text data to be compressed), "force" (forces compression in all cases), or a numerical integer value (which is equivalent to "on", but specifies the minimum amount of data before the output is compressed). If the content-length is not known and compression is set to "on" or more aggressive, the output will also be compressed. If not specified, this attribute is set to "off".

这两个配置是在servere.xml中的Connector部分，第一个配置是指定Tomcat压缩哪些内容，第二个配置是指示Tomcat是否启用压缩，默认是关闭的。所以假设我们要让Tomcat在默认的8080端口上的输出内容进行压缩，我们的配置应该是：

一旦启用了这个压缩功能后，我们怎么来测试压缩是否有效呢？首先Tomcat是根据浏览器请求头中的accept-encoding来判断浏览器是否支持压缩功能，如果这个值包含有gzip，就表明浏览器支持gzip压缩内容的浏览，所以我们可以用httpclient来写一个这样的简单测试程序

package com.liusoft.dlog4j.test;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.GetMethod;

/**
* HTTP客户端测试类
* @author liudong
*/
public class HttpTester {

/**
* @param args
*/
public static void main(String[] args) throws Exception{
  HttpClient http = new HttpClient();
  GetMethod get = new GetMethod("http://www.dlog.cn/js/prototype.js");
  try{
   get.addRequestHeader("accept-encoding", "gzip,deflate");
   get.addRequestHeader("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; Alexa Toolbar; Maxthon 2.0)");
   int er = http.executeMethod(get);
   if(er==200){
    System.out.println(get.getResponseContentLength());
    String html = get.getResponseBodyAsString();
    System.out.println(html);
    System.out.println(html.getBytes().length);
   }
  }finally{
   get.releaseConnection();
  }
}