javax.servlet.http.Cookie
JSESSIONID = 当前session 号码
org/apache/coyote/Request.java
基本封装类,包括基本request 信息 
其源代码在此可以查看 
http://www.docjar.com/html/api/org/apache/coyote/Request.java.html
 public Request() {
72  
73          parameters.setQuery(queryMB);
74          parameters.setURLDecoder(urlDecoder);
75          parameters.setHeaders(headers);
76  
77          methodMB.setString(
"GET");
78          uriMB.setString(
"/");
79          queryMB.setString("");
80          protoMB.setString(
"HTTP/1.0");
81  
82      }
83  
开始初始化
回收
 
// -------------------- Recycling -------------------- 
459 
460 
461     public void recycle() {
462         bytesRead=0;
463 
464         contentLength = -1;
465         contentTypeMB = 
null;
466         charEncoding = 
null;
467         headers.recycle();
468         serverNameMB.recycle();
469         serverPort=-1;
470         localPort = -1;
471         remotePort = -1;
472 
473         cookies.recycle();
474         parameters.recycle();
475 
476         unparsedURIMB.recycle();
477         uriMB.recycle(); 
478         decodedUriMB.recycle();
479         queryMB.recycle();
480         methodMB.recycle();
481         protoMB.recycle();
482         //remoteAddrMB.recycle();
483         //remoteHostMB.recycle();
484 
485         // XXX Do we need such defaults ?
486         schemeMB.recycle();
487         methodMB.setString(
"GET");
488         uriMB.setString(
"/");
489         queryMB.setString("");
490         protoMB.setString(
"HTTP/1.0");
491         //remoteAddrMB.setString("127.0.0.1");
492         //remoteHostMB.setString("localhost");
493 
494         instanceId.recycle();
495         remoteUser.recycle();
496         authType.recycle();
497         attributes.clear();
498     }
伟大的method() 方法
 
public MessageBytes method() {
184         return methodMB;
185     }
186     
  getMethod() 方法就是从这里搞来的。
还有 org.apache.tomcat.util.http.MimeHeader 存放了所有的Header 信息 
=== MimeHeaders ===
accept = image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*
referer = http://localhost/user/userRegister.html
accept-language = zh-CN,en-US;q=0.5
content-type = application/x-www-form-urlencoded
ua-cpu = x86
accept-encoding = gzip, deflate
user-agent = Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; InfoPath.1; MAXTHON 2.0)
host = localhost
content-length = 70
connection = Keep-Alive
cache-control = no-cache
cookie = JSESSIONID=06820B9CA579BF64CC89C5E041864459