{"id":1132,"date":"2021-03-16T22:15:29","date_gmt":"2021-03-16T14:15:29","guid":{"rendered":"https:\/\/www.52dixiaowo.com\/java\/?p=1132"},"modified":"2021-04-19T18:25:30","modified_gmt":"2021-04-19T10:25:30","slug":"filter-%e5%ae%9e%e7%8e%b0%e7%bb%9f%e4%b8%80%e7%bc%96%e7%a0%81","status":"publish","type":"post","link":"https:\/\/www.52dixiaowo.com\/java\/post-1132.html","title":{"rendered":"filter\u8fc7\u6ee4\u5668"},"content":{"rendered":"\n

filter \u662f\u4e00\u4e2a\u8fc7\u6ee4\u5668, \u80fd\u591f\u5bf9\u8bf7\u6c42\u8fdb\u884c\u62e6\u622a, \u901a\u5e38\u7528\u4e8e\u767b\u5f55\u9a8c\u8bc1, \u5904\u7406\u7f16\u7801, \u654f\u611f\u5b57\u7b26\u8fc7\u6ee4\u7b49<\/p>\n\n\n\n

\u521b\u5efaFilter<\/h5>\n\n\n\n

filter \u662f\u4e00\u4e2a class, \u4f7f\u7528 idea \u7b49\u7f16\u8bd1\u5668\u53ef\u4ee5\u76f4\u63a5\u521b\u5efa, \u8be5\u7c7b\u5b9e\u73b0\u4e86 Filter \u63a5\u53e3<\/p>\n\n\n\n

\u8be5\u7c7b\u9700\u8981\u914d\u7f6e\u624d\u80fd\u4f7f\u7528, \u914d\u7f6e\u62e6\u622a\u7684\u8def\u5f84, \u65b9\u5f0f\u7b49<\/p>\n\n\n\n

\u5173\u952e\u65b9\u6cd5 : doFilter<\/h5>\n\n\n\n

\u4f7f\u7528 doFilter \u65b9\u6cd5, \u5199\u4e0a\u4f60\u8981\u5904\u7406\u7684\u903b\u8f91\u4ee3\u7801, \u8be5\u65b9\u6cd5\u4e09\u53c2\u6570, request, response, filterchain, \u5206\u522b\u4ee3\u8868\u8bf7\u6c42\u5bf9\u8c61, \u54cd\u5e94\u5bf9\u8c61, \u4ee5\u53ca\u8fc7\u6ee4\u94fe\u5bf9\u8c61<\/p>\n\n\n\n

\u5176\u4e2d filterchain \u5bf9\u8c61, \u6709\u4e00\u4e2a\u65b9\u6cd5, filterChain.doFilter(servletRequest,servletResponse); \u8868\u793a\u653e\u884c, \u5728\u5b83\u4e4b\u524d\u7684\u4ee3\u7801\u8868\u793a\u5bf9\u8bf7\u6c42\u7684\u5904\u7406, \u5728\u5b83\u4e4b\u540e\u7684\u4ee3\u7801\u8868\u793a\u5bf9\u54cd\u5e94\u7684\u5904\u7406<\/p>\n\n\n\n

\u5bf9\u4e8e filter \u7684\u53e6\u5916 2 \u4e2a\u65b9\u6cd5, init \u548c destroy \u8868\u793aweb\u5bb9\u5668\u542f\u52a8\u548c\u9500\u6bc1\u7684\u5904\u7406<\/p>\n\n\n\n

\u914d\u7f6efilter<\/h5>\n\n\n\n

filter \u53ef\u4ee5\u4f7f\u7528 web.xml \u6216 @WebFilter \u6ce8\u89e3, \u4f8b\u5982<\/p>\n\n\n\n

<filter>\n\t<filter-name>demo1<\/filter-name>\n\t<filter-class>com.52dixiaowo.web.filter.FilterDemo1<\/filter-class>\n<\/filter>\n<filter-mapping>\n\t<filter-name>demo1<\/filter-name>\n\t<!-- \u62e6\u622a\u8def\u5f84 -->\n\t<url-pattern>\/*<\/url-pattern>\n<\/filter-mapping>\n<\/code><\/pre>\n\n\n\n
\u5bf9\u4e8e\u62e6\u622a\u8def\u5f84, \u4e0b\u9762\u6709 4 \u79cd\u7b80\u5355\u7684\u65b9\u5f0f, \u8fd8\u53ef\u4ee5\u81ea\u7531\u7ec4\u5408 <\/p>\n\n\n\n
  1. \u5177\u4f53\u8d44\u6e90\u8def\u5f84\uff1a \/index.jsp \u53ea\u6709\u8bbf\u95eeindex.jsp\u8d44\u6e90\u65f6\uff0c\u8fc7\u6ee4\u5668\u624d\u4f1a\u88ab\u6267\u884c<\/li>
  2. \u62e6\u622a\u76ee\u5f55\uff1a \/user\/* \u8bbf\u95ee\/user\u4e0b\u7684\u6240\u6709\u8d44\u6e90\u65f6\uff0c\u8fc7\u6ee4\u5668\u90fd\u4f1a\u88ab\u6267\u884c<\/li>
  3. \u540e\u7f00\u540d\u62e6\u622a\uff1a *.jsp \u8bbf\u95ee\u6240\u6709\u540e\u7f00\u540d\u4e3ajsp\u8d44\u6e90\u65f6\uff0c\u8fc7\u6ee4\u5668\u90fd\u4f1a\u88ab\u6267\u884c<\/li>
  4. \u62e6\u622a\u6240\u6709\u8d44\u6e90\uff1a\/* \u8bbf\u95ee\u6240\u6709\u8d44\u6e90\u65f6\uff0c\u8fc7\u6ee4\u5668\u90fd\u4f1a\u88ab\u6267\u884c<\/li><\/ol>\n\n\n\n
    \u5bf9\u4e8e\u8bf7\u6c42\u65b9\u5f0f, \u8fd8\u53ef\u4ee5\u9009\u5b9a\u54ea\u79cd\u8bf7\u6c42, \u9700\u8981\u8bbe\u7f6edispatcherTypes\u5c5e\u6027<\/p>\n\n\n\n
    1. REQUEST\uff1a\u9ed8\u8ba4\u503c\u3002\u6d4f\u89c8\u5668\u76f4\u63a5\u8bf7\u6c42\u8d44\u6e90, \u4e5f\u53ef\u4ee5\u540c\u65f6\u8bbe\u7f6e\u591a\u4e2a\u503c<\/li>
    2. FORWARD\uff1a\u8f6c\u53d1\u8bbf\u95ee\u8d44\u6e90<\/li>
    3. INCLUDE\uff1a\u5305\u542b\u8bbf\u95ee\u8d44\u6e90<\/li>
    4. ERROR\uff1a\u9519\u8bef\u8df3\u8f6c\u8d44\u6e90<\/li>
    5. ASYNC\uff1a\u5f02\u6b65\u8bbf\u95ee\u8d44\u6e90<\/li><\/ol>\n\n\n\n
      filter \u8fc7\u6ee4\u94fe\u7684\u987a\u5e8f\u95ee\u9898: \u5982\u679c\u662fweb.xml\u662f\u6309\u7167<filter-mapping>\u7684\u987a\u5e8f, \u800c\u6ce8\u89e3\u5219\u662f\u7c7b\u540d\u5b57\u7b26\u4e32\u5927\u5c0f, \u6bd4\u5982 AFilter \u6bd4 BFilter\u5148\u62e6\u622a.<\/p>\n","protected":false},"excerpt":{"rendered":"
      filter \u662f\u4e00\u4e2a\u8fc7\u6ee4\u5668, \u80fd\u591f\u5bf9\u8bf7\u6c42\u8fdb\u884c\u62e6\u622a, \u901a\u5e38\u7528\u4e8e\u767b\u5f55\u9a8c\u8bc1, \u5904\u7406\u7f16\u7801, \u654f\u611f\u5b57\u7b26\u8fc7\u6ee4\u7b49 \u521b\u5efaFil… \u7ee7\u7eed\u9605\u8bfb filter\u8fc7\u6ee4\u5668<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[11],"tags":[],"_links":{"self":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/1132"}],"collection":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/comments?post=1132"}],"version-history":[{"count":6,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/1132\/revisions"}],"predecessor-version":[{"id":1273,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/1132\/revisions\/1273"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/media?parent=1132"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/categories?post=1132"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/tags?post=1132"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}