关于Tomcat GZip的疑问

Question

为了减少网络流量
采用Tomcat Gzip压缩格式

               compression="on" 

               compressionMinSize="2048" 

               noCompressionUserAgents="gozilla, traviata" 

               compressableMimeType="text/html,application/xhtml+xml,application/xml,text/xml,text/javascript,text/css,text/plain,application/x-javascript,application/javascript,text/xhtml,text/json,application/json,application/x-www-form-urlencoded,text/javaScript"

 

其他都可以了,可是唯独 通过action 返回 json对象 不支持此压缩.
返回json 是采用
this.getResponse().setContentType("text/javascript;charset=utf-8");
方式传回的.

还试过web.xml 加
<mime-mapping>
         <extension>action</extension>
         <mime-type>text/html</mime-type>
</mime-mapping>
都不行(用的struts2,因此扩展名为action)

测试gzip 效果代码

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(url);

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.get);
String html = get.getResponseBodyAsString();
System.out.println(html.getBytes().length);
System.out.println(html);
}
}finally{
get.releaseConnection();
}
}

}



              
问题补充

sdh5724 写道

compressionMinSize="2048"  

大哥， 你json输出超过2K了么!!!!!!!!!!!!!!!!!

不要搞那么多!
何止2k 有时>1M
局域网,但有时网络也慢

问题补充：
谢谢回复
从firefox拿到的header 返回数据大概0.5M

响应头信息
Server Apache-Coyote/1.1

Transfer-Encoding chunked

Date Sun, 08 Mar 2009 11:58:34 GMT

请求头信息
Host 192.168.0.244:8088

User-Agent Mozilla/5.0 (Windows; U; Windows NT 5.1 zh-CN; rv:1.9.0.6) Gecko/2009011913 Firefox/3.0.6

Accept text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

Accept-Language zh-cn,zh;q=0.5

Accept-Encoding gzip,deflate

Accept-Charset gb2312,utf-8;q=0.7,*;q=0.7

Keep-Alive 300

Connection keep-alive

X-Requested-With XMLHttpRequest

Powered-By Ext

Content-Type application/x-www-form-urlencoded; charset=UTF-8

Referer
http://localhost/test/testGzip.action
Content-Length 121

Cookie JSESSIONID=6CB19BC17C83D1DF221258523C35C360

Pragma no-cache

Cache-Control no-cach
问题补充：
多谢 sdh5724
问题已解决
this.getResponse().setCharacterEncoding("utf-8");
this.getResponse().setContentType("text/javascript;charset=utf-8");
this.getResponse().getWriter().write(o.toString());

顺序应该在 this.getResponse().getWriter().write(o.toString());
之前

Answer 1

Server Apache-Coyote/1.1

Transfer-Encoding chunked

Date Sun, 08 Mar 2009 11:58:34 GMT

你这个返回头根本没有说是压缩， 你根本没有正确的输出文档类型。 所以， 你还是看看你的配置是否正确。 另外你需要在程序里指定， 你的输出是text/javascript 这样输出的时候tomcat 发现要压缩的类型，才能为你压缩。