{"id":627,"date":"2015-05-06T10:17:47","date_gmt":"2015-05-06T02:17:47","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=627"},"modified":"2017-10-15T21:02:44","modified_gmt":"2017-10-15T13:02:44","slug":"%e5%af%b9servlet%e7%9a%84%e5%88%9d%e5%a7%8b%e5%8c%96%e7%9a%84%e7%90%86%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=627","title":{"rendered":"\u5bf9Servlet\u7684\u521d\u59cb\u5316\u7684\u7406\u89e3"},"content":{"rendered":"<h3>1\u3001Servlet \u5728\u521d\u59cb\u5316\u7684\u65f6\u5019 , \u662f\u901a\u8fc7 init(ServletConfig config) \u6216 init() \u6765\u6267\u884c\u7684\u3002<\/h3>\n<p>ServletConfig \u662f\u4e00\u4e2a\u63a5\u53e3\uff0c\u5b83\u600e\u6837\u4f20\u9012\u7ed9\u4ed6\u4e00\u4e2a\u5bf9\u8c61\u6765\u8fdb\u884c\u521d\u59cb\u5316\u5462\uff1f\u5176\u5b9e\uff0c\u662f\u8fd9\u4e2a\u5bf9\u8c61\u662f\u7531 servlet \u5bb9\u5668\u6765\u5b9e\u4f8b\u5316\u7684\uff0c\u7531\u5bb9\u5668\u4ea7\u751f\u4e00\u4e2a ServletConfig \u7684\u5b9e\u73b0\u7c7b\u7684\u5bf9\u8c61\uff0c\u7136\u540e\u4f20\u9012\u7ed9 Servlet.<\/p>\n<p>\u7ed3\u8bba\uff1a ServletConfig \u7531\u5bb9\u5668\u5b9e\u4f8b\u5316<br \/>\n<!--more--><\/p>\n<h3>2\u3001\u6211\u4eec\u6709\u4e9b\u65f6\u5019\u53ef\u80fd\u5728 Servlet \u521d\u59cb\u5316\u65f6\u7ed9\u5b83\u4e00\u4e9b\u56fa\u5b9a\u7684\u914d\u7f6e\u53c2\u6570\uff0c\u90a3\u4e48\u8fd9\u4e9b\u53c2\u6570\u662f\u600e\u6837\u4f20\u9012\u5230 Servlet \u5462\uff1f<\/h3>\n<p>\u5176\u5b9e\uff0c\u6211\u4eec\u5728 web.xml \u4e2d\u7ed9 servlet \u914d\u7f6e\u542f\u52a8\u53c2\u6570\uff0c\u5728\u5bb9\u5668\u5bf9 servlet \u8fdb\u884c\u521d\u59cb\u5316\u7684\u65f6\u5019\uff0c\u4f1a\u6536\u96c6\u4f60\u6240\u914d\u7f6e\u7684\u53c2\u6570\uff0c\u8bb0\u5f55\u5728 ServletConfig \u7684\u5b9e\u73b0\u7c7b\u4e2d\uff0c\u6240\u4ee5\u4f60\u624d\u53ef\u4ee5\u901a\u8fc7 ServletConfig \u5bf9\u8c61\u7684<\/p>\n<p>[java]public String getInitParameter(String name); \u6216<\/p>\n<p>public Enumeration getInitParameterNames();[\/java]<\/p>\n<p>\u65b9\u6cd5\u6765\u53d6\u5f97\u4f60\u5df2\u7ecf\u914d\u7f6e\u597d\u7684\u53c2\u6570\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u4f60\u5bf9 servlet \u7684\u914d\u7f6e\u90fd\u5df2\u7ecf\u8bb0\u5f55\u5728 ServletConfig \u5bf9\u8c61\u4e2d\u4e86\u3002<\/p>\n<p>\u7ed3\u8bba\uff1a\u4f60\u5bf9 Servlet \u7684\u914d\u7f6e\uff0c\u5728 Servlet \u7684\u521d\u59cb\u5316\u65f6\u90fd\u7531\u5bb9\u5668\u6765\u6536\u96c6\u5e76\u4e14\u8bb0\u5f55\u5230 ServletConfig \u7684\u5b9e\u73b0\u7c7b\u4e2d\u3002<\/p>\n<h3>3\u3001\u6211\u4eec\u6765\u770b\u4e00\u4e2a Servlet \u7684\u914d\u7f6e<\/h3>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/ai.zhousir.top\/wp-content\/uploads\/2015\/05\/QQ\u255c\u256a\u2550\u255d20161202093851.png\" rel=\"fancybox\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-1773\" src=\"https:\/\/ai.zhousir.top\/wp-content\/uploads\/2015\/05\/QQ\u255c\u256a\u2550\u255d20161202093851.png\" alt=\"QQ\u255c\u256a\u2550\u255d20161202093851\" width=\"436\" height=\"325\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>\u5728\u6b64\uff0c\u6211\u4eec\u5b9e\u73b0\u5bf9\u6570\u636e\u5e93\u7684\u914d\u7f6e\u6587\u4ef6\u7684\u52a0\u8f7d\u3002<\/p>\n<p>\u5f53 Servlet \u521d\u59cb\u5316\u5b8c\u6210\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7<\/p>\n<p>[java]String dbconf=this.getServletConfig().getInitParameter(&quot;dbConfig&quot;)[\/java]<\/p>\n<p>\u6765\u53d6\u5f97\u6211\u4eec\u7684\u914d\u7f6e\u7684\u53c2\u6570\u7684\u503c\u3002<\/p>\n<p>\u4f46\u662f\uff0c\u6211\u4eec\u4ec5\u80fd\u5f97\u5230\u4e00\u4e2a\u914d\u7f6e\u7684\u5b57\u7b26\u4e32\u3002\u4e4b\u540e\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u914d\u7f6e\u6587\u4ef6\u53d6\u5f97\u6211\u4eec\u7684\u6570\u636e\u5e93\u7684\u914d\u7f6e\u53c2\u6570\uff0c\u7136\u540e\u5bf9\u6570\u636e\u5e93\u8fdb\u884c\u521d\u59cb\u5316\u3002<\/p>\n<p>\u5176\u5b9e\u6211\u4eec\u4e5f\u53ef\u4ee5\u901a\u8fc7\u4f20\u9012\u4e00\u4e2a\u7c7b\u7684\u540d\u5b57\u4e32\uff0c\u7136\u540e\u518d\u5b9e\u4f8b\u5316\u3002<\/p>\n<p>[java]cn.ittx.db.DBUtil<\/p>\n<p>\u6211\u4eec\u5148\u53d6\u5f97\u914d\u7f6e\u53c2\u6570\uff1a<\/p>\n<p>String dbconf=this.getServletConfig().getInitParameter(&quot;dbconfig&quot;) \uff1b<\/p>\n<p>\u7136\u540e\u901a\u8fc7<\/p>\n<p>Class.forName(dbconf).getInstance();[\/java]<\/p>\n<p>\u6765\u5b9e\u4f8b\u5316\u5bf9\u8c61\uff0c\u5c31\u53ef\u4ee5\u5b9e\u73b0\u5bf9\u6570\u636e\u5e93\u7684\u8c03\u7528\u4e86\u3002<\/p>\n<p>\u7ed3\u8bba\uff1a\u5728 web.xml \u4e2d\u5bf9 Servlet \u7684\u521d\u59cb\u5316\uff0c\u53ea\u80fd\u4f20\u9012\u5b57\u7b26\u4e32\u7c7b\u578b\u7684\u6570\u636e<\/p>\n<h3>4\u3001 ServletContext<\/h3>\n<p>ServletContext \u662f\u8d1f\u8d23\u548c Servlet \u7684\u4e0a\u6587\u548c\u4e0b\u6587\u4ea4\u4e92\uff0c\u4e0a\u9762\u548c Servlet \u5bb9\u5668\u4ea4\u4e92\uff0c\u4e0b\u9762\u548c Servlet \u4e2d\u7684\u8bf7\u6c42\u548c\u76f8\u5e94\u8fdb\u884c\u4ea4\u4e92\u3002<\/p>\n<p>\u5728 ServletConfig \u4e2d\uff0c<\/p>\n<p>public ServletContext getServletContext(); \u65b9\u6cd5\u5b9e\u73b0\u53d6\u5f97\u5f53\u524d ServletContext \u7684\u5bf9\u8c61\u3002<\/p>\n<p>\u4f60\u53ef\u80fd\u8981\u95ee\uff0c ServletContext \u662f\u4e00\u4e2a\u63a5\u53e3\uff0c\u90a3\u4e48\u4f60\u5982\u4f55\u53d6\u5f97\u4ed6\u7684\u5bf9\u8c61\u5462\uff1f<\/p>\n<p>\u5176\u5b9e\u8fd9\u4e2a\u95ee\u9898\u548c ServletConfig \u76f8\u540c\uff0c\u90fd\u662f\u5728 Servlet \u8fdb\u884c\u521d\u59cb\u5316\u7684\u65f6\u5019\u4ea7\u751f\u7684\u5bf9\u8c61\uff0c\u662f\u7531\u5bb9\u5668\u6765\u521d\u59cb\u5316\u7684\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u6269\u5c55\u5b66\u4e60 \u00a0\u00a0<a href=\"https:\/\/segmentfault.com\/a\/1190000004107420\">\u6df1\u5165\u5206\u6790JavaWeb\u89e3 Item6 &#8212; servletConfig \u4e0eservletContext\u8be6<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>1\u3001Servlet \u5728\u521d\u59cb\u5316\u7684\u65f6\u5019 , \u662f\u901a\u8fc7 init(ServletConfig config) \u6216 in [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[60],"tags":[],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/627"}],"collection":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=627"}],"version-history":[{"count":4,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/627\/revisions"}],"predecessor-version":[{"id":2169,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/627\/revisions\/2169"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=627"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=627"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=627"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}