{"id":1021,"date":"2004-02-25T15:38:00","date_gmt":"2004-02-25T07:38:00","guid":{"rendered":"http:\/\/www.sunnyblog.net\/blog\/?p=1021"},"modified":"2004-02-25T15:38:00","modified_gmt":"2004-02-25T07:38:00","slug":"servletjsp%e6%9c%8d%e5%8a%a1%e5%99%a8%e7%ab%af%e7%9a%84%e9%87%8d%e5%ae%9a%e5%90%91","status":"publish","type":"post","link":"https:\/\/www.sunnyblog.net\/blog\/archives\/1021","title":{"rendered":"Servlet\/JSP\u670d\u52a1\u5668\u7aef\u7684\u91cd\u5b9a\u5411"},"content":{"rendered":"

\u8fd9\u4e2a\u5176\u5b9e\u5f88\u7b80\u5355\uff0c\u4e0d\u8fc7\u5e73\u5e38\u6709\u65f6\u5019\u7528\u5230\uff0c\u4e3a\u4e86\u61d2\u5f97\u53bbgoogle\uff0c\u6240\u4ee5\u5148\u653e\u81ea\u5df1\u8fd9\u91cc\u65b9\u4fbf\uff0c^_^<\/p>\n

\u901a\u5e38\uff0c\u5728\u4e00\u4e2a\u8bbe\u8ba1\u826f\u597d\u7684Web\u5e94\u7528\u4e2d\uff0c\u90fd\u4f1a\u7efc\u5408\u4f7f\u7528Servlet\u548cJSP\u6280\u672f\u3002Servlet\u63a7\u5236\u4e1a\u52a1\u6d41\u8f6c\uff0cJSP\u5219\u8d1f\u8d23\u4e1a\u52a1\u5904\u7406\u7ed3\u679c\u7684\u663e\u793a\u3002\u6b64\u65f6\uff0c\u5c06\u5927\u91cf\u7528\u5230\u91cd\u5b9a\u5411\u6280\u672f\u3002<\/p>\n

\u91cd\u5b9a\u5411\u6280\u672f\u53ef\u4ee5\u5206\u4e3a\u4e24\u7c7b\uff0c\u4e00\u7c7b\u662f\u5ba2\u6237\u7aef\u91cd\u5b9a\u5411\uff0c\u4e00\u7c7b\u662f\u670d\u52a1\u5668\u7aef\u91cd\u5b9a\u5411\u3002\u5ba2\u6237\u7aef\u91cd\u5b9a\u5411\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6e\u7279\u5b9a\u7684HTTP\u5934\uff0c\u6216\u8005\u5199JavaScript\u811a\u672c\u5b9e\u73b0\u3002\u672c\u6587\u4e3b\u8981\u63a2\u8ba8\u670d\u52a1\u5668\u7aef\u91cd\u5b9a\u5411\u6280\u672f\u7684\u5b9e\u73b0\u3002<\/p>\n

\u670d\u52a1\u5668\u7aef\u7684\u91cd\u5b9a\u5411\u76f8\u5173\u7c7b<\/span><\/strong><\/p>\n

\u670d \u52a1\u5668\u7aef\u7684\u91cd\u5b9a\u5411\u6280\u672f\u6d89\u53ca\u5230javax.servlet.ServletContext\u3001 javax.servlet.RequestDispatcher\u3001javax.servlet.http.ServletRequest\u3001 javax.servlet.http.ServletResponse\u7b49\u51e0\u4e2a\u63a5\u53e3\u3002<\/p>\n

\u670d\u52a1\u5668\u7aef\u7684\u91cd\u5b9a\u5411\u65b9\u5f0f<\/strong><\/span><\/p>\n

\u670d\u52a1\u5668\u7aef\u7684\u91cd\u5b9a\u5411\u53ef\u4ee5\u6709\u4e24\u79cd\u65b9\u5f0f\uff0c\u4e00\u662f\u4f7f\u7528HttpServletResponse\u7684sendRedirect()\u65b9\u6cd5\uff0c\u4e00\u662f\u4f7f\u7528RequestDispatcher\u7684forward()\u65b9\u6cd5\u3002\u4e0b\u9762\u5bf9\u8fd9\u4e24\u79cd\u65b9\u5f0f\u8fdb\u884c\u4ecb\u7ecd\u3002<\/p>\n

HttpServletResponse.sendRedirect()\u65b9\u6cd5<\/strong><\/p>\n

HttpServletResponse\u63a5\u53e3\u5b9a\u4e49\u4e86\u53ef\u7528\u4e8e\u8f6c\u5411\u7684sendRedirect()\u65b9\u6cd5\u3002\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
\n
\n\npublic void sendRedirect(java.lang.String location)throws java.io.IOException<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u8fd9\u4e2a\u65b9\u6cd5\u5c06\u54cd\u5e94\u5b9a\u5411\u5230\u53c2\u6570location \u6307\u5b9a\u7684\u3001\u65b0\u7684URL\u3002location\u53ef\u4ee5\u662f\u4e00\u4e2a\u7edd\u5bf9\u7684URL\uff0c\u5982 response.sendRedirect(“http:\/\/java.sun.com”)\u4e5f\u53ef\u4ee5\u4f7f\u7528\u76f8\u5bf9\u7684URL\u3002\u5982\u679clocation\u4ee5\u201c\/\u201d\u5f00 \u5934\uff0c\u5219\u5bb9\u5668\u8ba4\u4e3a\u76f8\u5bf9\u4e8e\u5f53\u524dWeb\u5e94\u7528\u7684\u6839\uff0c\u5426\u5219\uff0c\u5bb9\u5668\u5c06\u89e3\u6790\u4e3a\u76f8\u5bf9\u4e8e\u5f53\u524d\u8bf7\u6c42\u7684URL\u3002\u8fd9\u79cd\u91cd\u5b9a\u5411\u7684\u65b9\u6cd5\uff0c\u5c06\u5bfc\u81f4\u5ba2\u6237\u7aef\u6d4f\u89c8\u5668\u7684\u8bf7\u6c42URL\u8df3\u8f6c\u3002\u4ece\u6d4f\u89c8\u5668 \u4e2d\u7684\u5730\u5740\u680f\u4e2d\u53ef\u4ee5\u770b\u5230\u65b0\u7684URL\u5730\u5740\uff0c\u4f5c\u7528\u7c7b\u4f3c\u4e8e\u4e0a\u9762\u8bbe\u7f6eHTTP\u54cd\u5e94\u5934\u4fe1\u606f\u7684\u5b9e\u73b0\u3002<\/p>\n
RequestDispatcher.forward()\u65b9\u6cd5<\/strong><\/p>\n
RequestDispatcher\u662f\u4e00\u4e2aWeb\u8d44\u6e90\u7684\u5305\u88c5\u5668\uff0c\u53ef\u4ee5\u7528\u6765\u628a\u5f53\u524drequest\u4f20\u9012\u5230\u8be5\u8d44\u6e90\uff0c\u6216\u8005\u628a\u65b0\u7684\u8d44\u6e90\u5305\u62ec\u5230\u5f53\u524d\u54cd\u5e94\u4e2d\u3002RequestDispatcher\u63a5\u53e3\u4e2d\u5b9a\u4e49\u4e86\u4e24\u4e2a\u65b9\u6cd5\uff0c\u53c2\u89c1\u5982\u4e0b\u4ee3\u7801\uff1a<\/p>\n\n\n\n
\n
\n\npublic interface RequestDispatcher {\n\n void forward(ServletRequest request, ServletResponse response);\n\n void include(ServletRequest request, ServletResponse response);\n\n}<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
forward()\u65b9\u6cd5\u5c06\u5f53\u524d\u7684 request\u548cresponse\u91cd\u5b9a\u5411\u5230\u8be5RequestDispacher\u6307\u5b9a\u7684\u8d44\u6e90\u3002\u8fd9\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\u5927\u91cf\u4f7f\u7528\uff0c\u56e0\u4e3a\u5b8c\u6210\u4e00\u4e2a\u4e1a\u52a1\u64cd\u4f5c\u5f80\u5f80\u9700\u8981\u8de8\u8d8a\u591a \u4e2a\u6b65\u9aa4\uff0c\u6bcf\u4e00\u6b65\u9aa4\u5b8c\u6210\u76f8\u5e94\u7684\u5904\u7406\u540e\uff0c\u8f6c\u5411\u5230\u4e0b\u4e00\u4e2a\u6b65\u9aa4\u3002\u6bd4\u5982\uff0c\u901a\u5e38\u4e1a\u52a1\u5904\u7406\u5728Servlet\u4e2d\u5904\u7406\uff0c\u5904\u7406\u7684\u7ed3\u679c\u8f6c\u5411\u5230\u4e00\u4e2aJSP\u9875\u9762\u8fdb\u884c\u663e\u793a\u3002\u8fd9\u6837\u770b\u8d77\u6765 \u7c7b\u4f3c\u4e8eServlet\u94fe\u7684\u529f\u80fd\uff0c\u4f46\u662f\u8fd8\u6709\u4e00\u4e9b\u533a\u522b\u3002\u4e00\u4e2aRequestDispatcher\u5bf9\u8c61\u53ef\u4ee5\u628a\u8bf7\u6c42\u53d1\u9001\u5230\u4efb\u610f\u4e00\u4e2a\u670d\u52a1\u5668\u8d44\u6e90\uff0c\u800c\u4e0d\u4ec5\u4ec5\u662f\u53e6\u5916\u4e00\u4e2a Servlet\u3002 include()\u65b9\u6cd5\u5c06\u628aRequest Dispatcher\u8d44\u6e90\u7684\u8f93\u51fa\u5305\u542b\u5230\u5f53\u524d\u8f93\u51fa\u4e2d\u3002<\/p>\n
\u6ce8\u610f\uff0c\u53ea\u6709\u5728\u5c1a\u672a\u5411\u5ba2\u6237\u7aef\u8f93\u51fa\u54cd\u5e94\u65f6\u624d\u53ef\u4ee5\u8c03\u7528forward()\u65b9\u6cd5\uff0c\u5982\u679c\u9875\u9762\u7f13\u5b58\u4e0d\u4e3a\u7a7a\uff0c\u5728\u91cd\u5b9a\u5411\u524d\u5c06\u81ea\u52a8\u6e05\u9664\u7f13\u5b58\u3002\u5426\u5219\u5c06\u629b\u51fa\u4e00\u4e2aIllegalStateException\u5f02\u5e38\u3002<\/p>\n
\u5982\u4f55\u5f97\u5230RequestDispatcher<\/span><\/strong><\/p>\n
\u6709\u4e09\u79cd\u65b9\u6cd5\u53ef\u4ee5\u5f97\u5230Request Dispatcher\u5bf9\u8c61\u3002<\/p>\n
1.javax.servlet. ServletRequest\u7684getRequestDispatcher(String path)\u65b9\u6cd5\uff0c\u5176\u4e2dpath\u53ef\u4ee5\u662f\u76f8\u5bf9\u8def\u5f84\uff0c\u4f46\u4e0d\u80fd\u8d8a\u51fa\u5f53\u524dServlet\u4e0a\u4e0b\u6587\u3002\u5982\u679cpath\u4ee5\u201c\/\u201d\u5f00\u5934\uff0c\u5219\u89e3\u6790\u4e3a\u76f8\u5bf9\u4e8e\u5f53\u524d\u4e0a\u4e0b\u6587\u7684\u6839\u3002<\/p>\n
2.javax.servlet. ServletContext\u7684getRequestDispatcher(String path)\u65b9\u6cd5\uff0c\u5176\u4e2dpath\u5fc5\u987b\u4ee5\u201c\/\u201d\u5f00\u5934\uff0c\u8def\u5f84\u76f8\u5bf9\u4e8e\u5f53\u524d\u7684Servlet\u4e0a\u4e0b\u6587\u3002\u53ef\u4ee5\u8c03\u7528ServletContext\u7684 getContext(String uripath)\u5f97\u5230\u53e6\u4e00\u4e2aServlet\u4e0a\u4e0b\u6587\uff0c\u5e76\u53ef\u4ee5\u8f6c\u5411\u5230\u5916\u90e8\u4e0a\u4e0b\u6587\u7684\u4e00\u4e2a\u670d\u52a1\u5668\u8d44\u6e90\u94fe\u63a5\u3002<\/p>\n
3.\u4f7f\u7528javax.servlet. ServletContext\u7684getNamedDispatcher(String name)\u5f97\u5230\u540d\u4e3aname\u7684\u4e00\u4e2aWeb\u8d44\u6e90\uff0c\u5305\u62ecServlet\u548cJSP\u9875\u9762\u3002\u8fd9\u4e2a\u8d44\u6e90\u7684\u540d\u5b57\u5728Web\u5e94\u7528\u90e8\u7f72\u63cf\u8ff0\u6587\u4ef6web.xml\u4e2d\u6307\u5b9a\u3002<\/p>\n
\u8fd9\u4e09\u79cd\u65b9\u6cd5\u7684\u4f7f\u7528\u6709\u7ec6\u5fae\u7684\u5dee\u522b\u3002\u6bd4\u5982\uff0c\u4e0b\u9762\u662f\u4e00\u4e2a\u5e94\u7528\u7684\u914d\u7f6e\u6587\u4ef6web.xml\uff1a<\/p>\n\n\n\n
\n
\n\n<?xml version=\"1.0\" ?>\n\n<!DOCTYPE web-app PUBLIC \"-\/\/Sun Microsystems, Inc.\/\/DTD Web Application 2.2\/\/EN\"\n\n\"http:\/\/java.sun.com\/j2ee\/dtds\/web-app_2_2.dtd\">\n\n<web-app>\n\n<servlet>\n\n<servlet-name>FirstServlet<\/servlet-name>\n\n<servlet-class>org. javaresearch.redirecttest.ServletOne<\/servlet-class>\n\n<\/servlet>\n\n<servlet>\n\n<servlet-name>SecondServlet<\/servlet-name>\n\n<servlet-class>org.javaresearch. redirecttest.ServletTwo<\/servlet-class>\n\n<\/servlet>\n\n<servlet-mapping>\n\n<servlet-name>FirstServlet<\/servlet-name>\n\n<url-pattern>\/servlet\/firstservlet\/<\/url-pattern>\n\n<\/servlet-mapping>\n\n<servlet-mapping>\n\n<servlet-name>SecondServlet<\/servlet-name>\n\n<url-pattern>\/servlet\/secondservlet\/<\/url-pattern>\n\n<\/servlet-mapping>\n\n<\/web-app><\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u5176\u4e2d\u5b9a\u4e49\u4e86\u4e24\u4e2aServlet\uff0c\u540d\u5b57\u5206\u522b\u4e3a FirstServlet\u548cSecondServlet\uff0c\u5bf9\u5e94\u7684\u7c7b\u5206\u522b\u4e3aorg.javaresearch. redirecttest.ServletOne\u548corg. javaresearch.redirecttest.ServletTwo\u3002\u53ef\u4ee5\u5728\u6d4f\u89c8\u5668\u4e2d\u901a\u8fc7\u7c7b\u4f3c\u4e8e\u4e0b\u9762\u7684\u94fe\u63a5\u8bbf\u95ee\uff1a<\/p>\n
http:\/\/localhost:8080\/servlet\/firstservlet\/<\/p>\n
\u4f7f\u75281\u4e2d\u65b9\u6cd5\uff0c\u4f8b\u5982\u5728firstservlet\u53ef\u4ee5\u5199\u5165\u4e0b\u9762\u7684\u4ee3\u7801\uff1a<\/p>\n\n\n\n
\n
\n\nRequestDispatcher rd = request.getRequestDispatcher(\"secondservlet\");\n\nrd.forward(request, response);<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u6b64\u65f6\u63a7\u5236\u6743\u5c06\u8f6c\u5411\u5230\u7b2c\u4e8c\u4e2aServlet\u4e86\u3002<\/p>\n
\u4f7f\u75282\u4e2d\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u4eceServlet Context\u4e2d\u5f97\u5230RequestDispatcher\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
\n
\n\nRequestDispatcher rd = getServletContext().getRequest\n\nDispatcher(\"\/servlet\/secondservlet\");\n\nrd.forward(request, response);<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u4f7f\u75283\u4e2d\u7684\u65b9\u6cd5\uff0c\u4ece\u4e0a\u9762\u7684web. xml\u914d\u7f6e\u6587\u4ef6\u53ef\u4ee5\u770b\u5230\u5b9a\u4e49\u4e86\u4e24\u4e2aServlet\uff0c\u540d\u5b57\u5206\u522b\u4e3aFirstServlet\u548cSecondServlet\uff0c\u6240\u4ee5\u53ef\u4ee5\u5f97\u5230\u547d\u540d\u7684Dispatcher\uff1a<\/p>\n\n\n\n
\n
\n\nRequestDispatcher rd =  getServletContext().getNamedDispatcher(\"SecondServlet\");\n\nrd.forward(request, response);<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u8fd9\u6837\u4e5f\u53ef\u4ee5\u91cd\u5b9a\u5411\u5230SecondServlet\u4e86\u3002<\/p>\n
JSP\u9875\u9762\u4e2d\u7684\u91cd\u5b9a\u5411<\/span><\/strong><\/p>\n
JSP\u5728\u89e3\u6790\u540e\u7f16\u8bd1\u4e3a\u4e00\u4e2aServlet\u8fd0\u884c\uff0c\u6240\u4ee5\u5728JSP\u4e2d\u4e5f\u53ef\u4ee5\u4f7f\u7528\u4e0a\u9762\u7684\u91cd\u5b9a\u5411\u4ee3\u7801\uff0c\u5e76\u4e14\uff0cJSP\u8fd8\u63d0\u4f9b\u4e86\u66f4\u4fbf\u5229\u7684\u64cd\u4f5c\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
\n
\n\n<jsp:forward page= \"nextpage.jsp\"\/><\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
JSP\u9875\u9762\u6267\u884c\u5230\u8fd9\u513f\uff0c\u5c06\u7ec8\u6b62\u5f53\u524d\u7684\u5904\u7406\uff0c\u5c06\u63a7\u5236\u6743\u4ea4\u7531nextpage.jsp\u3002<\/p>\n
\u5982\u4f55\u9009\u62e9<\/strong><\/p>\n
RequestDispatcher.forward() \u65b9\u6cd5\u548cHttpServletResponse.sendRedirect()\u65b9\u6cd5\u7684\u533a\u522b\u662f\uff1a\u524d\u8005\u4ec5\u662f\u5bb9\u5668\u4e2d\u63a7\u5236\u6743\u7684\u8f6c\u5411\uff0c\u5728\u5ba2\u6237\u7aef\u6d4f\u89c8\u5668\u5730\u5740\u680f\u4e2d\u4e0d\u4f1a\u663e \u793a\u51fa\u8f6c\u5411\u540e\u7684\u5730\u5740\uff1b\u540e\u8005\u5219\u662f\u5b8c\u5168\u7684\u8df3\u8f6c\uff0c\u6d4f\u89c8\u5668\u5c06\u4f1a\u5f97\u5230\u8df3\u8f6c\u7684\u5730\u5740\uff0c\u5e76\u91cd\u65b0\u53d1\u9001\u8bf7\u6c42\u94fe\u63a5\u3002\u8fd9\u6837\uff0c\u4ece\u6d4f\u89c8\u5668\u7684\u5730\u5740\u680f\u4e2d\u53ef\u4ee5\u770b\u5230\u8df3\u8f6c\u540e\u7684\u94fe\u63a5\u5730\u5740\u3002\u6240\u4ee5\uff0c\u524d\u8005 \u66f4\u52a0\u9ad8\u6548\uff0c\u5728\u524d\u8005\u53ef\u4ee5\u6ee1\u8db3\u9700\u8981\u65f6\uff0c\u5c3d\u91cf\u4f7f\u7528Request Dispatcher.forward()\u65b9\u6cd5\uff0c\u5e76\u4e14\uff0c\u8fd9\u6837\u4e5f\u6709\u52a9\u4e8e\u9690\u85cf\u5b9e\u9645\u7684\u94fe\u63a5\u3002\u5728\u6709\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6bd4\u5982\uff0c\u9700\u8981\u8df3\u8f6c\u5230\u4e00\u4e2a\u5176\u5b83\u670d\u52a1\u5668\u4e0a\u7684\u8d44\u6e90\uff0c\u5219\u5fc5\u987b\u4f7f\u7528 HttpServletResponse.sendRequest()\u65b9\u6cd5\u3002<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"
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