{"id":2414,"date":"2020-10-21T13:23:18","date_gmt":"2020-10-21T05:23:18","guid":{"rendered":"http:\/\/admin.evshou.com\/?p=2414"},"modified":"2020-10-25T16:28:41","modified_gmt":"2020-10-25T08:28:41","slug":"2020javaweb%e6%95%99%e7%a8%8b%ef%bc%9aservlet%e5%ba%94%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.9713job.com\/?p=2414","title":{"rendered":"2020javaweb\u6559\u7a0b\uff1aservlet\u5e94\u7528"},"content":{"rendered":"

javaweb\u6559\u7a0b\uff1aservlet\u5e94\u7528<\/h3>\n

servlet\u4f7f\u7528<\/span><\/h3>\n

servlet\u6838\u5fc3\u63a5\u53e3\u548c\u7c7b<\/p>\n

Servlet\u63a5\u53e3
\n\u5728ServletAPI\u4e2d\u6700\u91cd\u8981\u7684\u662fServlet\u63a5\u53e3\uff0c\u6240\u6709servlet\u90fd\u4f1a\u76f4\u63a5\u6216\u95f4\u63a5\u7684\u4e0e\u8be5\u63a5\u53e3\u53d1\u751f\u8054\u7cfb\uff0c
\n\u6216\u662f\u76f4\u63a5\u5b9e\u73b0\u63a5\u53e3\uff0c\u6216\u95f4\u63a5\u7ee7\u627f\u81ea\u5b9e\u73b0\u4e86\u8be5\u63a5\u53e3\u7684\u7c7b
\n\u8be5\u63a5\u53e3\u5305\u62ec\u4ee5\u4e0b\u4e94\u4e2a\u65b9\u6cd5\uff1a<\/p>\n

<\/p>\n

init(ServletConfig config)
\nServletConfig getServletConfig()
\nservice(ServletRequest req,ServletResponse res)
\nString getServletInfo()
\ndestroy()<\/p>\n

\u5904\u7406\u65b9\u5f0f\uff1a
\n1.\u7b2c\u4e00\u6b21\u8bbf\u95eeServlet\u65f6\uff0c\u670d\u52a1\u5668\u4f1a\u521b\u5efaServlet\u5bf9\u8c61\uff0c\u5e76\u8c03\u7528init\u65b9\u6cd5\uff0c\u518d\u8c03\u7528service\u65b9\u6cd5
\n2.\u7b2c\u4e8c\u6b21\u5728\u8bbf\u95ee\u65f6\uff0cservlet\u5bf9\u8c61\u5df2\u7ecf\u5b58\u5728\uff0c\u4e0d\u518d\u521b\u5efa\uff0c\u4e5f\u4e0d\u518d\u521d\u59cb\u5316\uff0c\u6267\u884cservice\u65b9\u6cd5
\n3.\u5f53\u670d\u52a1\u5668\u505c\u6b62\uff0c\u4f1a\u91ca\u653eservlet\uff0c\u8c03\u7528destroy\u65b9\u6cd5\u3002
\n====================================
\nGenericServlet\u62bd\u8c61\u7c7b<\/p>\n

GenericServlet\u4f7f\u7f16\u5199Servlet\u53d8\u5f97\u66f4\u5bb9\u6613\u3002\u5b83\u63d0\u4f9b\u751f\u547d\u5468\u671f\u65b9\u6cd5init\u548cdestroy\u7684\u7b80\u5355\u5b9e\u73b0\uff0c
\n\u8981\u7f16\u5199\u4e00\u822c\u7684servlet\uff0c\u53ea\u9700\u91cd\u5199\u62bd\u8c61service\u65b9\u6cd5\u5373\u53ef\u3002<\/p>\n

HttpServlet\u7c7b
\n\u662f\u7ee7\u627fGenericServlet\u7684\u57fa\u7840\u4e0a\u8fdb\u4e00\u6b65\u7684\u6269\u5c55
\n\u63d0\u4f9b\u5c06\u8981\u88ab\u5b50\u7c7b\u5316\u4ee5\u521b\u5efa\u9002\u7528\u4e8eweb\u7ad9\u70b9\u7684HTTP servlet\u7684\u62bd\u8c61\u7c7b\u3002
\nHttpServlet\u7684\u5b50\u7c7b\u81f3\u5c11\u5fc5\u987b\u91cd\u5199\u4e00\u4e2a\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u901a\u5e38\u662f\u4ee5\u4e0b\u8fd9\u4e9b\u65b9\u6cd5\u4e4b\u4e00\uff1a<\/p>\n

doGet\uff0c\u5982\u679cservlet\u652f\u6301HTTP GET\u8bf7\u6c42
\ndoPost\uff0c\u7528\u4e8eHTTP POST\u8bf7\u6c42
\ndoPut\uff0c\u7528\u4e8eHTTP PUT\u8bf7\u6c42
\ndoDelete\uff0c\u7528\u4e8eHTTP DELETE\u8bf7\u6c42
\ninit\u548cdestroy\uff0c\u7528\u4e8e\u7ba1\u7406servlet\u7684\u751f\u547d\u5468\u671f\u5185\u4fdd\u5b58\u7684\u8d44\u6e90
\ngetServletInfo,Servlet\u4f7f\u7528\u5b83\u63d0\u4f9b\u6709\u5173\u5176\u81ea\u8eab\u7684\u4fe1\u606f<\/p>\n

====================================
\nservlet\u4e24\u79cd\u65b9\u5f0f\u914d\u7f6e<\/p>\n

1.web.xml\u8fdb\u884cservlet\u914d\u7f6e<\/p>\n

\u5bb9\u5668\u5728\u8fdb\u884curl-pattern\u914d\u7f6e\u7684\u65f6\u5019\u662f\u9075\u5faa\u4e00\u5b9a\u7684\u5339\u914d\u539f\u5219\u7684
\nurl-pattern\u5b9a\u4e49\u5339\u914d\u89c4\u5219\uff0c\u53d6\u503c\u8bf4\u660e<\/p>\n

\u7cbe\u786e\u5339\u914d \/\u5177\u4f53\u540d\u79f0 \u53ea\u6709url\u8def\u5f84\u662f\u5177\u4f53\u7684\u540d\u79f0\u7684\u65f6\u5019\u624d\u4f1a\u89e6\u53d1servlet
\n\u540e\u7f00\u5339\u914d *.xxx \u53ea\u8981\u662f\u4ee5xxx\u7ed3\u5c3e\u7684\u5c31\u5339\u914d\u89e6\u53d1servlet
\n\u901a\u914d\u7b26\u5339\u914d \/* \u5339\u914d\u6240\u4ee5\u8bf7\u6c42\uff0c\u5305\u542b\u670d\u52a1\u5668\u7684\u6240\u6709\u8d44\u6e90
\n\u901a\u914d\u7b26\u5339\u914d \/ \u5339\u914d\u6240\u4ee5\u8bf7\u6c42\uff0c\u5305\u542b\u670d\u52a1\u5668\u7684\u6240\u6709\u8d44\u6e90\uff0c\u4e0d\u542bjsp<\/p>\n

load-on-startup<\/p>\n

1.\u5143\u7d20\u6807\u8bb0\u5bb9\u5668\u662f\u5426\u5e94\u8be5\u5728web\u5e94\u7528\u7a0b\u5e8f\u542f\u52a8\u7684\u65f6\u5019\u5c31\u52a0\u8f7d\u8fd9\u4e2aservlet
\n2.\u5b83\u7684\u503c\u5fc5\u987b\u662f\u4e00\u4e2a\u6574\u6570\uff0c\u8868\u793aservlet\u88ab\u52a0\u8f7d\u7684\u5148\u540e\u987a\u5e8f
\n3.\u5982\u679c\u8be5\u5143\u7d20\u7684\u503c\u4e3a\u8d1f\u6570\u6216\u8005\u6ca1\u6709\u8bbe\u7f6e\uff0c\u5219\u5bb9\u5668\u4f1a\u5f53servlet\u88ab\u8bf7\u6c42\u65f6\u5728\u52a0\u8f7d
\n4.\u5982\u679c\u503c\u4e3a\u6b63\u6574\u6570\u6216\u80050\u65f6\uff0c\u8868\u793a\u5bb9\u5668\u5728\u5e94\u7528\u542f\u52a8\u65f6\u5c31\u52a0\u8f7d\u5e76\u521d\u59cb\u5316\u8fd9\u4e2aservlet\uff0c
\n\u503c\u8d8a\u5c0f\uff0cservlet\u7684\u4f18\u5148\u7ea7\u8d8a\u9ad8\uff0c\u5c31\u8d8a\u5148\u88ab\u52a0\u8f7d\u3002\u503c\u76f8\u540c\u65f6\uff0c\u5bb9\u5668\u5c31\u4f1a\u81ea\u5df1\u9009\u62e9
\n\u987a\u5e8f\u6765\u52a0\u8f7d<\/p>\n

2.\u6ce8\u89e3\u5f0f\u914d\u7f6eservlet<\/p>\n

\u6ce8\u89e3\u7c7bwebservlet
\nvalue:\u914d\u7f6eurl\u8def\u5f84
\nurlPatterns:\u914d\u7f6eurl\u8def\u5f84\uff0c\u548cvalue\u4f5c\u7528\u4e00\u6837\uff0c\u4e0d\u80fd\u540c\u65f6\u4f7f\u7528
\nloadOnStartup:\u914d\u7f6eservlet\u7684\u521b\u5efa\u7684\u65f6\u673a\uff0c\u5982\u679c\u662f0\u6216\u8005\u6b63\u6570\u542f\u52a8\u7a0b\u5e8f\u65f6\uff0c\u5219\u521b\u5efa\uff0c\u5982\u679c\u662f\u8d1f\u6570
\n\u5219\u8bbf\u95ee\u65f6\u521b\u5efa<\/p>\n

@WebServlet(“\/hello”)<\/p>\n

web.xml\u914d\u7f6eservlet<\/p>\n

<!–Servlet\u914d\u7f6e –>
\n<servlet>
\n<!–\u540d\u79f0 –>
\n<servlet-name>hello2<\/servlet-name>
\n<!–Servlet\u7684\u5168\u79f0\u7c7b\u540d –>
\n<servlet-class>com.qf.web.servlet.HelloServlet<\/servlet-class>
\n<!–\u542f\u52a8\u7684\u4f18\u5148\u7ea7\uff0c\u6570\u5b57\u8d8a\u5c0f\u8d8a\u5148\u8d77\u4f5c\u7528 –>
\n<load-on-startup>1<\/load-on-startup>
\n<\/servlet>
\n<!–\u6620\u5c04\u914d\u7f6e –>
\n<servlet-mapping>
\n<!–\u540d\u79f0 –>
\n<servlet-name>hello2<\/servlet-name>
\n<!–\u8d44\u6e90\u7684\u5339\u914d\u89c4\u5219\uff1a\u7cbe\u786e\u5339\u914d –>
\n<url-pattern>\/hello2<\/url-pattern>
\n<\/servlet-mapping><\/p>\n

3.\u521b\u5efaservlet\u6587\u4ef6<\/p>\n

\u6b22\u8fce\u9875\u9762
\n<form action=”HelloServlet”>
\n<label>\u59d3\u540d\uff1a<\/label><input name=”name”><br\/>
\n<label>\u5e74\u9f84\uff1a<\/label><input name=”age”><br\/>
\n<input type=”submit” value=”\u63d0\u4ea4”>
\n<\/form><\/p>\n

index.jsp<\/p>\n

\u9519\u8bef\u9875\u9762<\/p>\n

404
\n\/error\/404.html<\/p>\n

====================================
\n\u8bf7\u6c42\u65b9\u5f0f
\n\u9ed8\u8ba4\u8bf7\u6c42\u65b9\u5f0f\u662fget<\/p>\n

GET\u8bf7\u6c42
\nget\u63d0\u4ea4\u7684\u6570\u636e\u4f1a\u653e\u5728url\u4e4b\u540e\uff0c\u4ee5\uff1f\u5206\u5272url\u548c\u4f20\u8f93\u6570\u636e\uff0c\u53c2\u6570\u4e4b\u95f4\u4ee5&\u76f8\u8fde
\nget\u63d0\u4ea4\u7684\u6570\u636e\u5927\u5c0f\u6709\u9650\u5236(\u56e0\u4e3a\u6d4f\u89c8\u5668\u5bf9url\u7684\u957f\u5ea6\u6709\u9650\u5236)
\nget\u65b9\u5f0f\u63d0\u4ea4\u6570\u636e\uff0c\u4f1a\u5e26\u6765\u5b89\u5168\u95ee\u9898
\n\u6548\u7387\u9ad8<\/p>\n

\u5bf9\u5e94\u7684servlet\u7684\u65b9\u6cd5\u662fdoGet<\/p>\n

POST\u8bf7\u6c42
\nPOST\u65b9\u6cd5\u662f\u628a\u63d0\u4ea4\u7684\u6570\u636e\u653e\u5728HTTP\u5305\u7684Body\u4e2d
\nPOST\u65b9\u6cd5\u63d0\u4ea4\u7684\u6570\u636e\u6ca1\u6709\u9650\u5236
\nPOST\u63d0\u4ea4\u7684\u662f\u6570\u636e\u76f8\u5bf9\u5b89\u5168
\n\u6548\u7387\u76f8\u5bf9\u6ca1\u6709GET\u9ad8<\/p>\n

\u5bf9\u5e94\u7684servlet\u7684\u65b9\u6cd5\u662fdoPost<\/p>\n

\u4e71\u7801\u95ee\u9898
\ntomcat7\u53ca\u4ee5\u4e0bGET\u51fa\u73b0\u4e71\u7801\u95ee\u9898
\n\u89e3\u51b3\uff1a
\n\/\/\u83b7\u53d6\u8868\u5355\u63d0\u4ea4\u7684\u59d3\u540d
\nString name=request.getParameter(“name”);
\nname=new String(name.getBytes(“ISO8859-1″),”UTF-8”);<\/p>\n

POST\u4e71\u7801\u89e3\u51b3
\nrequest.setCharacterEncoding(“UTF-8”);<\/p>\n

servlet\u89e3\u51b3\u4e71\u7801
\nresponse.setContentType(“text\/html;charset=”UTF-8”);<\/p>\n

====================================
\n\u91cd\u5b9a\u5411<\/p>\n

\u91cd\u5b9a\u5411\u5c31\u662f\u901a\u8fc7\u5404\u79cd\u65b9\u6cd5\u5c06\u7f51\u7edc\u8bf7\u6c42\u91cd\u65b0\u5b9a\u4e2a\u65b9\u5411\u8f6c\u5230\u5176\u4ed6\u4f4d\u7f6e<\/p>\n

\u539f\u7406\uff1a<\/p>\n

\u5ba2\u6237\u6d4f\u89c8\u5668\u53d1\u9001http\u8bf7\u6c42—\u300bweb\u670d\u52a1\u5668\u63a5\u6536\u540e\u53d1\u9001302\u72b6\u6001\u7801\u54cd\u5e94\u53ca\u5bf9\u5e94\u65b0\u7684
\nlocation\u7ed9\u5ba2\u6237\u6d4f\u89c8\u5668–\u300b\u5ba2\u6237\u6d4f\u89c8\u5668\u53d1\u73b0\u662f302\u54cd\u5e94\uff0c\u5219\u81ea\u52a8\u518d\u53d1\u9001\u4e00\u4e2a\u65b0\u7684
\nhttp\u8bf7\u6c42\uff0c\u8bf7\u6c42url\u662f\u65b0\u7684location\u5730\u5740—\u300b\u670d\u52a1\u5668\u6839\u636e\u6b64\u8bf7\u6c42\u5bfb\u627e\u8d44\u6e90\u5e76\u53d1\u9001\u7ed9\u5ba2\u6237\u3002<\/p>\n

\u7279\u70b9\uff1a<\/p>\n

1.\u91cd\u5b9a\u5411\u662f\u5ba2\u6237\u7aef\u884c\u4e3a
\n2.\u91cd\u5b9a\u5411\u662f\u6d4f\u89c8\u5668\u505a\u4e86\u81f3\u5c11\u4e24\u6b21\u7684\u8bbf\u95ee\u8bf7\u6c42
\n3.\u91cd\u5b9a\u5411\u6d4f\u89c8\u5668\u5730\u5740\u6539\u53d8
\n4.\u91cd\u5b9a\u5411\u4e24\u6b21\u8df3\u8f6c\u4e4b\u95f4\u4f20\u8f93\u7684\u4fe1\u606f\u4f1a\u4e22\u5931(request\u8303\u56f4)
\n5.\u91cd\u5b9a\u5411\u53ef\u4ee5\u6307\u5411\u4efb\u4f55\u7684\u8d44\u6e90\uff0c\u5305\u62ec\u5f53\u524d\u5e94\u7528\u7a0b\u5e8f\u4e2d\u7684\u5176\u4ed6\u8d44\u6e90\uff0c
\n\u540c\u4e00\u4e2a\u7ad9\u70b9\u4e0a\u7684\u5176\u4ed6\u5e94\u7528\u7a0b\u5e8f\u4e2d\u7684\u8d44\u6e90\uff0c\u5176\u4ed6\u7ad9\u70b9\u7684\u8d44\u6e90\u3002<\/p>\n

\u6ce8\u610f\uff1a\u4f20\u9012\u7ed9HTTPServletResponse.sendRedirect\u65b9\u6cd5\u7684\u76f8\u5bf9URL
\n\u4ee5\u201c\/\u201d\u5f00\u5934\uff0c\u5b83\u662f\u76f8\u5bf9\u4e8e\u6574\u4e2aweb\u7ad9\u70b9\u7684\u6839\u76ee\u5f55<\/p>\n

response.sendRedirect(“\/html”);<\/p>\n

====================================
\n\u8f6c\u53d1<\/p>\n

\u539f\u7406\uff1a
\n\u5ba2\u6237\u6d4f\u89c8\u5668\u53d1\u9001http\u8bf7\u6c42—\u300bweb\u670d\u52a1\u5668\u63a5\u6536\u8bf7\u6c42–\u300b\u8c03\u7528\u5185\u90e8\u7684\u4e00\u4e2a
\n\u65b9\u6cd5\u5728\u5bb9\u5668\u5185\u90e8\u5b8c\u6210\u8bf7\u6c42\u5904\u7406\u548c\u8f6c\u53d1\u52a8\u4f5c—-\u300b\u5c06\u76ee\u6807\u8d44\u6e90\u53d1\u9001\u7ed9\u5ba2\u6237\u3002<\/p>\n

\u7279\u70b9\uff1a<\/p>\n

1.\u8f6c\u53d1\u662f\u670d\u52a1\u5668\u884c\u4e3a
\n2.\u8f6c\u53d1\u662f\u6d4f\u89c8\u5668\u53ea\u505a\u4e86\u4e00\u6b21\u8bbf\u95ee\u8bf7\u6c42
\n3.\u8f6c\u53d1\u6d4f\u89c8\u5668\u5730\u5740\u4e0d\u53d8
\n4.\u8f6c\u53d1\u4e24\u6b21\u8df3\u8f6c\u4e4b\u95f4\u4f20\u8f93\u7684\u4fe1\u606f\u4e0d\u4f1a\u4e22\u5931\uff0c\u6240\u4ee5\u53ef\u4ee5\u901a\u8fc7request\u8fdb\u884c\u6570\u636e\u7684\u4f20\u9012
\n5.\u8f6c\u53d1\u53ea\u80fd\u5c06\u8bf7\u6c42\u8f6c\u53d1\u7ed9\u540c\u4e00\u4e2aweb\u5e94\u7528\u4e2d\u7684\u7ec4\u4ef6<\/p>\n

\u6ce8\u610f\uff1a\u5982\u679c\u521b\u5efaRequestDispatcher \u5bf9\u8c61\u65f6\u6307\u5b9a\u7684\u76f8\u5bf9URL\u4ee5\u201c\/\u201d\u5f00\u5934\uff0c
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request.getRequestDispatcher(“\/Servlet”).forward(request,response);<\/p>\n","protected":false},"excerpt":{"rendered":"

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