?15? Servlet????

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?15? Servlet????

• Java 2 ?????????

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??

• 15-1 Servlet???
• 15-2 ??Servlet??
• ????
• ??????

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15-1 Servlet???

• 15-1.1 CGI?Servlet
• 15-1.2 ?????Servlet??

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??

• ?????????????????,????????????!?????????,?????????
  ?????????,????????????????????,Servlet????????????
  ?

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15-1.1 CGI?Servlet

• ??????(Common Gateway Interafce,??CGI)?????????,?W
  WW???,???????????,???????????,CGI?????????????????
  ???????,??????????,??????????

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????????

• ??CGI????????Java?C???Visual Basic??
• Servlet?????CGI???,??????????????,???Servlet??Ser
  ver?let????????,?Java?,let????????(???????Apple
  t??Application?let??????),???????????????????
  ?,????Servlet??????????????

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15-1.2 ?????Servlet??

• Java Servlet?????Servlet?WWW?????,??Servlet???Serv
  let??,???????????Servlet???

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??????????Servlet Container??????

• Apache?UNIX/Linux/Windows?????WWW???,?IIS?Windows?
  ????WWW???,????????????Servlet Container????(?????
  ????Resin??)

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?????Resin?????????
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???????????,????Resin??

• ????????????http//localhost8080/,??????????,????
  Resin???

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15-2 ??Servlet??

• 15-2.1 ???Servlet??
• 15-2.2 ???????

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??

• ???Servlet???,??Java Servlet????WWW????????,??????
  ??

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15-2.1 ???Servlet??

• Java Servlet???????HttpServlet???????Servlet?????,
  ?????????HTTP??????,????Java Servlet??????javax.se
  rvlet?javax.servlet.http????

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Servlet?????

• Servlet????????WWW???????,???Servlet?????Java
  Servlet,?service???doXXX????????(???service????,??
  ????doXXX??),?????????

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???Servlet??????????
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Servlet?????

• ??doGet???????HttpServletRequest?HttpServletRespon
  se??????,?????ServletException?IOException????,???
  ??????(service?doXXX??????doGet??)

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????????????

1. HttpServletRequest???????????????,????????????
2. HttpServletResponse???????????????,??????????HTM
   L???

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???????

• ??doGet????HttpServletResponse??,????PrintWriter??
  ,???????,?????????????,????????????

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??????????????????

• ???????????,?????????charsetBig5,??Big5??(????),
  ??res.setContentType("text/htmlcharsetBig5")?

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??HttpServletResponse??????PrintWriter????,????

• ??????????,?????HttpServletResponse??????PrintWrit
  er????,?????
• ???????,???????????HTML??(??HTML????16-2.2)

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????????
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?????????

1. ?2?3??????javax.servlet?javax.servlet.http????
2. ?5??doGet????????????,?????service??????
3. ?9???getWriter??????PrintWriter????,???1116??????
   ???HTML??,?????????
4. ??PrintWriter????java.io???,????1????java.io????
5. ?16???close?????????

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???????????

• Resin-2.1.16?????WWW???????C\resin-2.1.16\doc\
  WEB-I NF\classes,????Servlet??????????,???????????
  ???(Servlet????????.java)

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???,??????

• ???,???????,???classes??????.class??,???????????

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15-2.2 ???????

• ??Java Servlet?????HTML?????,????????????????,???
  ??????????????
• ServletRequest????????????????????,???HttpServletR
  equest?????ServletRequest??,?????????ServletReques
  t??????
• ???service?doXXX???,????ServletRequest??????

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ServletRequest???????????
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????????
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?????????

1. ?6??service?????????????
2. ?10?11???HttpServletRequest??request??????t1?t2???
   ,???Double.parseDouble???????double?????
3. ?13???????,???(??-100)0.9?
4. ?1719??????????????,????2329??????????,????????

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???????????HTML??,??????????????????

• ???Java Servlet??,????C\resin-2.1.16\doc?????????
  HTML??,??????????????????(???Servlet?????),?????

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?????????

• ?6??ltformgt?????????get,???????Servlet?????/servle
  t/ch15_02_02?
• ?8?10?????????,????t1?t2?
• ?11?????????,???????????

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???

• ???,???????????(????HTML??????),???HTML??
• ??????,???????????????,?????,??????Servlet??,?????
  ???????,??????

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????-1
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????-2
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??????-???
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??????-???