{"id":355,"date":"2010-08-08T14:42:02","date_gmt":"2010-08-08T13:42:02","guid":{"rendered":"http:\/\/kudzia.eu\/b\/?p=355"},"modified":"2014-01-05T22:11:13","modified_gmt":"2014-01-05T21:11:13","slug":"setting-compression-level-for-gzipoutputstream-in-java","status":"publish","type":"post","link":"https:\/\/kudzia.eu\/b\/2010\/08\/setting-compression-level-for-gzipoutputstream-in-java\/","title":{"rendered":"setting compression level for GZIPOutputStream in java"},"content":{"rendered":"<p>i&#8217;m compressing quite a lot of data on the fly to save storage&#8230; until now i&#8217;ve been quite sure one cannot control compression level with oracle java&#8217;s GZIPOutputStream but apparently i was wrong.<br \/>\n<!--more--><br \/>\nin <a href=\"http:\/\/weblogs.java.net\/blog\/2003\/12\/26\/achieving-better-compression-deflater\">this<\/a> article &#8211; i&#8217;ve found an easy solution.<\/p>\n<p>instead of:<\/p>\n<pre class=\"brush: plain; title: ; notranslate\" title=\"\">\r\nGZIPOutputStream gzipout = new GZIPOutputStream(bos);\r\n<\/pre>\n<p>use<\/p>\n<pre class=\"brush: plain; title: ; notranslate\" title=\"\">\r\nOutputStream gzipout = new GZIPOutputStream(bos){{def.setLevel(Deflater.BEST_COMPRESSION);}};\r\n<\/pre>\n<p>to construct your compressor.<\/p>\n<p>but setting compression level to 9 [instead of default 5] made outputs barely ~0.5% smaller for me:<\/p>\n<pre class=\"brush: plain; title: ; notranslate\" title=\"\">\r\nbefore\tafter\tgain\r\n11350\t11327\t23\r\n57172\t57102\t70\r\n83377\t83284\t93\r\n78015\t77803\t212\r\n51987\t51732\t255\r\n<\/pre>\n<p>[all sizes provided in B]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>i&#8217;m compressing quite a lot of data on the fly to save storage&#8230; until now i&#8217;ve been quite sure one cannot control compression level with oracle java&#8217;s GZIPOutputStream but apparently i was wrong.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[],"class_list":["post-355","post","type-post","status-publish","format-standard","hentry","category-tech"],"_links":{"self":[{"href":"https:\/\/kudzia.eu\/b\/wp-json\/wp\/v2\/posts\/355","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kudzia.eu\/b\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kudzia.eu\/b\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kudzia.eu\/b\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kudzia.eu\/b\/wp-json\/wp\/v2\/comments?post=355"}],"version-history":[{"count":10,"href":"https:\/\/kudzia.eu\/b\/wp-json\/wp\/v2\/posts\/355\/revisions"}],"predecessor-version":[{"id":2027,"href":"https:\/\/kudzia.eu\/b\/wp-json\/wp\/v2\/posts\/355\/revisions\/2027"}],"wp:attachment":[{"href":"https:\/\/kudzia.eu\/b\/wp-json\/wp\/v2\/media?parent=355"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kudzia.eu\/b\/wp-json\/wp\/v2\/categories?post=355"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kudzia.eu\/b\/wp-json\/wp\/v2\/tags?post=355"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}