Tomcat配置gzip压缩
有时因为数据量大(或者图片比较大)需要启用压缩，这里就记录下如何开启Tomcat的gzip压缩1.配置server.xml文件
找到包含protocol="HTTP/1.1"这个属性值的connector，添加下面的配置：
compression="on" compressionMinSize="50" noCompressionUserAgents="gozilla, traviata" compressableMimeType="application/json,text/html,text/xml,text/javascript,text/css,text/plain"
其中：
compressableMimeType表示启用压缩的mimetype，noCompressionUserAgents表示哪些浏览器不使用gzip压缩
2.应用中输出数据
response.setContentType("application/json;charset=UTF-8");
PrintWriter writer = response.getWriter();
writer.print(......);
writer.flush();
writer.close();
这里主要是要设置Content-Type这个头，应该在之前配置的compressableMimeType列表中
3.获取gzip压缩后的数据
采用HttpClient方式模拟http请求，想要获取的是gzip压缩后的数据，那么应该在accept-encoding请求头的值中添加gzip类型
public static void main(String[] args) throws Exception {
HttpMethod method = new GetMethod("http://localhost/web/user");
method.setRequestHeader(new Header("accept-encoding","gzip,deflate,sdch"));
HttpClient client = new HttpClient();
client.executeMethod(method);
String response = method.getResponseBodyAsString();
System.out.println("---------------------------------------------------------");
System.out.println(response);
System.out.println("---------------------------------------------------------");
String res = getUngzipString(method);
System.out.println("---------------------------------------------------------");
System.out.println(res);
System.out.println("---------------------------------------------------------");
System.out.println();
}
public static String getUngzipString(HttpMethod method) throws Exception{
InputStream is = method.getResponseBodyAsStream();
GZIPInputStream gzin = new GZIPInputStream(is);
InputStreamReader isr = new InputStreamReader(gzin, "UTF-8");
java.io.BufferedReader br = new java.io.BufferedReader(isr);
StringBuffer sb = new StringBuffer();
String tempbf;
while ((tempbf = br.readLine()) != null) {
sb.append(tempbf);
}
isr.close();
gzin.close();
System.out.println(method.getResponseHeader("Content-Type")+"-->"+method.getResponseHeader("Content-Type").getValue());
return sb.toString();
}
如上段代码是测试读取gzip的2个方法，第一个打印System.out.println(response)输出的内容是乱码，第二个打印System.out.println(res)输出的是gzip解压后的内容
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