Tomcat6设置gzip压缩 Java解压缩gzip

liyuandong

Tomcat6设置gzip压缩 Java解压缩gzip

 
          Tomcat的配置文件conf/server.xml添加如下的后四个属性即可设置将资源进行gzip压缩，有效提高响应速度：
 <Connector port="7087" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443"                 
               compression="on"
               compressionMinSize="2048"
               noCompressionUserAgents="gozilla,traviata"               compressableMimeType="text/html,text/xml,text/javascript,text/css,text/plain,image/gif,image/jpeg,image/png" />
利用http://gzip.zzbaike.com/ 测试，出现404 Not found错误好吧，自己测试搜的别人的代码：

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.GetMethod;
 
public class HttpTester {
 
   public static void main(String[] args) throws Exception{
        HttpClient http = new HttpClient();
        GetMethod get = new GetMethod("http://www.baidu.com/");
           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();
          }
      }
  }
要想编译运行这段代码，必须引入3个包：commons-httpclient-3.0.1.jar    commons-logging-1.1.1.jar     和   commons-codec-1.4.jar
并且String html = get.getResponseBodyAsString(); 最好替换为 InputStream is = get.getResponseBodyAsStream();然后再处理这个输入流(可以利用ByteArrayBuffer，但是需要引入httpcore-4.1.jar也可以不用，反正各种方法)
另一种测试方法，利用基本的J2SE，不用引入任何第三方包，也是搜的别人的：

public class Test2 {
 public static void main(String[] args) {
       try {
            URL url = new URL("http://www.baidu.com/");
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestProperty("Accept-Encoding", "gzip,deflate");//如果这里不设置，返回的就不是gzip的数据了，也就不用解压缩了
            conn.connect();
            InputStream in = conn.getInputStream();
            BufferedReader bin = new BufferedReader(new InputStreamReader(in,"GB2312"));
  
            //GZIPInputStream gzin = new GZIPInputStream(in);
         // BufferedReader bin = new BufferedReader(new InputStreamReader(gzin, "GB2312"));  
          String s = null;
          while((s=bin.readLine())!=null){
          System.out.println(s);
          }
            bin.close();
     } catch (Exception e) {
           e.printStackTrace();
    }
  }
}
解压缩就是上面注释掉的两行代码