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    -Xms<size> set initial Java heap size ÉèÖÃJVM³õʼ»¯¶ÑÄÚ´æ´óС
    -Xmx<size> set maximum Java heap size ÉèÖÃJVM×î´óµÄ¶ÑÄÚ´æ´óС
    -Xss<size> set java thread stack size ÉèÖÃJVMÕ»ÄÚ´æ´óС
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    JavaµÄµ÷ÊÔ¹¦ÄÜÊÇJVM×Ô´øµÄ,
    Ð½¨debug.batÎļþ, дÈëÒÔÏÂÄÚÈÝ, ÔËÐиÃÎļþÆô¶¯Tomcat¼´¿ÉÓëEclipseÔ¶³Ìµ÷ÊÔ
    set JPDA_ADDRESS=8787
    set JPDA_TRANSPORT=dt_socket
    set JAVA_OPTS=-Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,address=8787,server=y,suspend=n %JAVA_OPTS%
    startup
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    // attachment:×÷Ϊ¸½¼þÏÂÔØ | inline:ÔÚÏß´ò¿ª
    response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\";");
    // Ò»¶¨Òª±£Ö¤Ã»ÓÐ×ö¹ý¹ØÓÚ½ûÖ¹ä¯ÀÀÆ÷»º´æµÄ²Ù×÷
    // response.setHeader("Pragma", "No-cache");
    // response.setHeader("Cache-Control", "No-cache");
    // response.setDateHeader("Expires", 0);
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  *the First Java
  *@author wanglei
  *@version 1.0
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