使用GZIP压缩的方式向客户端传输响应数据
1， 工具类：测试客户端是否支持GZIP编码压缩方式 & 获得支持GZIP的PrintWriter对象package freebsd;import java.io.IOException;import java.io.PrintWriter;import java.util.zip.GZIPOutputStream;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class Utilities {/** 测试客户端浏览器是否支持gzip的编码方式*/public static boolean isSurpported(HttpServletRequest request){ String encodingString = request.getHeader("Accept-Encoding"); return (encodingString!=null) && (encodingString.indexOf("gzip")!=-1);}/** 取得一个压缩的PrintWriter*/public static PrintWriter getWriter(HttpServletResponse response) throws IOException{ ServletOutputStream sos = response.getOutputStream(); GZIPOutputStream gzipos = new GZIPOutputStream(sos); return new PrintWriter(gzipos);}}2，Servlet类，产生一个长字符串，然后在html页面中请求该servlet:import freebsd.*;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/*** Servlet implementation class ServletGzip*/public class ServletGzip extends HttpServlet {private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public ServletGzip() { super(); // TODO Auto-generated constructor stub }/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response);}/*** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); response.setStatus(response.SC_OK); PrintWriter out; if(Utilities.isSurpported(request)) { out = Utilities.getWriter(response); //协议： 通知客户端使用gzip这种压缩方式而不是其它的，如compress response.setHeader("Content-Encoding", "gzip")； }else { out = response.getWriter(); }StringBuilder sBuilder = new StringBuilder(); for(int i=0; i!=5000; ++i) { sBuilder.append("Printing the long string... ...!"); } out.println(sBuilder);out.close();}}
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