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1.essionÄڵĴæ·ÅµÄÊǶÔÏóµÄÒýÓÃ,ËùÒÔÐÞ¸ÄÄÚÖöÔÏóºó,²»ÐèÒªÖØÐ·ÅÖõ½sessionÖÐ
2.ÅäÖÃContext³õʼ»¯²ÎÊý
<Context-param>
<param-name></paran-name>
<param-value></param-value>
<Context-param>
this.getServletContext().getInitParameter(arg0);
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3.ÅäÖÃservlet³õʼ»¯²ÎÊý
<init-param>
   <param-name></param-name>
   <param-value></param-value>
</inti-param>
ServletConfig config=this.getServletConfig();
config.getParameter(""); 
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4ÅäÖÃÎļþ properties
¸ñʽ: key=value  ÆäÖÐkey²»±ä valueÊDZ仯µÄ
ÀýÈç: #ÆäÖÐ"#"ΪעÊÍ
   Îļþ db.properties
    username=ÇØÑæÅà
    password=peiaihua 
×îºÃ·ÅÖõ½/WEB-INF/db.properties  
 ¶ÁÈ¡ÊôÐÔÎļþµÄÐÅÏ¢:
 /ÔÚwebÓ¦ÓÃÖÐ,getServletContext().getRealPath±íʾµÄ
 ÊÇweb¹¤³ÌµÄ¸ù·¾¶,
 Èç:"C:\Program Files\apache-tomcat-6.0.18\webapps\TestURL"
 
 String path=this.getServletContext().getRealPath("");
 FileImputSream fi=new FileInputStream(path);
 Properties pro=new Properties();
 pro.load(fi);
 pro.getProperty("key");
 
 String realPath=this.getServletContext().getResourceAsStream("/WEB-INF/db.properties")
 ±íʾµÄÒ²ÊÇ´Ó¸ù·¾¶¿ªÊ¼¼ÓÔØÎļþ:
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 <Load-on-startup>0,1,2,3,....</Load-on-srartup>
 -----------------------------------------------------------------------------------------------------------------
 servletͨÐÅ(communicate):
  ·¾¶ÉèÖÃ:
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