{"id":294922,"date":"2024-05-20T15:22:14","date_gmt":"2024-05-20T07:22:14","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/294922.html"},"modified":"2024-05-20T15:22:25","modified_gmt":"2024-05-20T07:22:25","slug":"javaweb-%e5%a6%82%e4%bd%95%e6%8e%a5%e6%94%b6%e6%9f%a5%e8%af%a2%e5%8f%82%e6%95%b0","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/294922.html","title":{"rendered":"javaweb \u5982\u4f55\u63a5\u6536\u67e5\u8be2\u53c2\u6570"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/27142017\/ff237ffc-6714-4932-8036-b3715e38df4d.webp\" alt=\"javaweb \u5982\u4f55\u63a5\u6536\u67e5\u8be2\u53c2\u6570\" \/><\/p>\n<p><p>\u5728JavaWeb\u4e2d\uff0c<strong>\u63a5\u6536\u67e5\u8be2\u53c2\u6570\u662f\u901a\u8fc7HTTP\u8bf7\u6c42<\/strong>\u4e2d\u7684\u67e5\u8be2\u5b57\u7b26\u4e32\u6765\u5b8c\u6210\u7684\u3002\u8fd9\u4e00\u6d41\u7a0b\u4e3b\u8981\u6d89\u53ca\u5230<strong>HttpServletRequest\u5bf9\u8c61<\/strong>\uff0c\u5b83\u63d0\u4f9b\u4e86\u591a\u4e2a\u65b9\u6cd5\u6765\u83b7\u53d6\u8bf7\u6c42\u4e2d\u7684\u53c2\u6570\uff0c\u5982<code>getParameter<\/code>\u3001<code>getParameterValues<\/code>\u3001<code>getParameterMap<\/code>\u7b49\u3002\u5176\u4e2d\uff0c\u6700\u4e3a\u5e38\u7528\u7684\u65b9\u6cd5\u662f<code>getParameter<\/code>\uff0c\u5b83\u5141\u8bb8\u4f60\u901a\u8fc7\u53c2\u6570\u540d\u76f4\u63a5\u83b7\u53d6\u5bf9\u5e94\u7684\u53c2\u6570\u503c\u3002\u8fd9\u662f\u56e0\u4e3aHTTP\u8bf7\u6c42\u53d1\u9001\u5230\u670d\u52a1\u5668\u65f6\uff0c\u53c2\u6570\u4f1a\u9644\u52a0\u5728URL\u4e4b\u540e\uff0c\u901a\u8fc7<code>?<\/code>\u4e0eURL\u5206\u9694\u5e76\u4ee5\u952e\u503c\u5bf9\u5f62\u5f0f\u5b58\u5728\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u83b7\u53d6\u5355\u4e00\u53c2\u6570\u503c<\/h3>\n<\/p>\n<p><p>\u5f53\u4f60\u9700\u8981\u4eceHTTP\u8bf7\u6c42\u4e2d\u83b7\u53d6\u5355\u4e00\u53c2\u6570\u503c\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528<code>HttpServletRequest<\/code>\u7684<code>getParameter(String name)<\/code>\u65b9\u6cd5\u3002\u8fd9\u4e2a\u65b9\u6cd5\u63a5\u6536\u4e00\u4e2a\u5b57\u7b26\u4e32\u53c2\u6570\uff0c\u5373\u4f60\u60f3\u83b7\u53d6\u7684\u67e5\u8be2\u53c2\u6570\u7684\u540d\u5b57\uff0c\u7136\u540e\u8fd4\u56de\u4e00\u4e2a\u5b57\u7b26\u4e32\u503c\uff0c\u5373\u53c2\u6570\u7684\u503c\u3002\u5982\u679c\u8bf7\u6c42\u4e2d\u4e0d\u5b58\u5728\u8be5\u53c2\u6570\uff0c\u5219\u8fd4\u56de<code>null<\/code>\u3002<\/p>\n<\/p>\n<p><p>\u9996\u5148\uff0c\u4f60\u9700\u8981\u4e86\u89e3\u5ba2\u6237\u7aef\u53d1\u9001\u8bf7\u6c42\u5230\u670d\u52a1\u5668\u7aef\uff0c\u901a\u5e38\u4f1a\u643a\u5e26\u4e00\u4e9b\u6570\u636e\uff0c\u8fd9\u4e9b\u6570\u636e\u53ef\u80fd\u662f\u8868\u5355\u7684\u8f93\u5165\u5185\u5bb9\uff0c\u4e5f\u53ef\u80fd\u662fURL\u4e2d\u7684\u67e5\u8be2\u5b57\u7b26\u4e32\u3002\u5728\u5904\u7406\u8fd9\u4e9b\u8bf7\u6c42\u65f6\uff0c\u4e86\u89e3\u5982\u4f55\u4ece\u4e2d\u63d0\u53d6\u5173\u952e\u4fe1\u606f\u53d8\u5f97\u5c24\u4e3a\u91cd\u8981\u3002<\/p>\n<\/p>\n<p><p>\u4f8b\u5982\uff0c\u8003\u8651\u4e00\u4e2a\u60c5\u51b5\uff0c\u5ba2\u6237\u7aef\u901a\u8fc7\u5982\u4e0bURL\u5411\u670d\u52a1\u5668\u53d1\u9001\u8bf7\u6c42\uff1a<\/p>\n<\/p>\n<p><pre><code>http:\/\/example.com\/somepage?name=John&amp;age=30<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u8fd9\u91cc\uff0c<code>name<\/code>\u548c<code>age<\/code>\u662f\u4f20\u9012\u7ed9\u670d\u52a1\u5668\u7684\u67e5\u8be2\u53c2\u6570\u3002\u82e5\u4f60\u60f3\u83b7\u53d6<code>name<\/code>\u53c2\u6570\u7684\u503c\uff0c\u53ef\u4ee5\u5728Servlet\u4e2d\u8fd9\u6837\u5199\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-java\">protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {<\/p>\n<p>    String name = request.getParameter(&quot;name&quot;);<\/p>\n<p>    \/\/ \u5bf9name\u7684\u503c\u8fdb\u884c\u5904\u7406<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u4e2a\u65b9\u6cd5\u7b80\u5355\u660e\u4e86\uff0c\u975e\u5e38\u9002\u5408\u83b7\u53d6\u5355\u4e2a\u53c2\u6570\u503c\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n<p><h3>\u4e8c\u3001\u83b7\u53d6\u591a\u503c\u53c2\u6570<\/h3>\n<\/p>\n<p><p>\u6709\u4e9b\u60c5\u51b5\u4e0b\uff0c\u540c\u4e00\u4e2a\u53c2\u6570\u540d\u53ef\u80fd\u4f1a\u6709\u591a\u4e2a\u503c\uff0c\u6bd4\u5982\u5728\u63d0\u4ea4\u8868\u5355\u65f6\u4f7f\u7528\u4e86\u591a\u9009\u6846\u3002\u6b64\u65f6\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528<code>getParameterValues(String name)<\/code>\u65b9\u6cd5\u6765\u83b7\u53d6\u6240\u6709\u7684\u503c\u3002\u8fd9\u4e2a\u65b9\u6cd5\u8fd4\u56de\u7684\u662f\u4e00\u4e2aString\u6570\u7ec4\u3002<\/p>\n<\/p>\n<p><p>\u4f8b\u5b50\u5982\u4e0b\uff1a<\/p>\n<\/p>\n<p><p>\u5047\u8bbe\u8bf7\u6c42URL\u4e3a\uff1a<\/p>\n<\/p>\n<p><pre><code>http:\/\/example.com\/somepage?hobby=reading&amp;hobby=swimming<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728Servlet\u4e2d\uff0c\u4f60\u53ef\u4ee5\u8fd9\u6837\u83b7\u53d6<code>hobby<\/code>\u53c2\u6570\u7684\u6240\u6709\u503c\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-java\">protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {<\/p>\n<p>    String[] hobbies = request.getParameterValues(&quot;hobby&quot;);<\/p>\n<p>    \/\/ \u5bf9hobbies\u6570\u7ec4\u8fdb\u884c\u5904\u7406\uff0c\u5982\u904d\u5386<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u4e2a\u65b9\u6cd5\u4f7f\u5f97\u63a5\u6536\u591a\u9009\u6846\u7b49\u63d0\u4ea4\u7684\u591a\u503c\u53c2\u6570\u6210\u4e3a\u53ef\u80fd\u3002<\/p>\n<\/p>\n<p><h3>\u4e09\u3001\u83b7\u53d6\u6240\u6709\u53c2\u6570\u7684\u6620\u5c04\u5173\u7cfb<\/h3>\n<\/p>\n<p><p>\u6709\u65f6\u5019\uff0c\u4e00\u4e2a\u8bf7\u6c42\u53ef\u80fd\u5305\u542b\u591a\u4e2a\u53c2\u6570\uff0c\u800c\u4f60\u53ef\u80fd\u9700\u8981\u4e00\u6b21\u6027\u83b7\u53d6\u5b83\u4eec\u5e76\u8fdb\u884c\u5904\u7406\u3002<code>getParameterMap()<\/code>\u65b9\u6cd5\u80fd\u591f\u5e2e\u52a9\u4f60\u5b9e\u73b0\u8fd9\u4e00\u9700\u6c42\uff0c\u5b83\u8fd4\u56de\u4e00\u4e2a<code>Map&lt;String, String[]&gt;<\/code>\u7c7b\u578b\u7684\u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u4e2d\u5305\u542b\u4e86\u8bf7\u6c42\u4e2d\u6240\u6709\u7684\u53c2\u6570\u53ca\u5176\u5bf9\u5e94\u7684\u503c\uff08\u503c\u4ee5\u6570\u7ec4\u5f62\u5f0f\u5b58\u5728\uff09\u3002<\/p>\n<\/p>\n<p><p>\u4e0b\u9762\u7684\u4ee3\u7801\u793a\u4f8b\u8bf4\u660e\u4e86\u5982\u4f55\u4f7f\u7528<code>getParameterMap()<\/code>\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-java\">protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {<\/p>\n<p>    Map&lt;String, String[]&gt; paramMap = request.getParameterMap();<\/p>\n<p>    \/\/ \u904d\u5386paramMap\u8fdb\u884c\u5904\u7406<\/p>\n<p>    for(Map.Entry&lt;String, String[]&gt; entry : paramMap.entrySet()) {<\/p>\n<p>        String paramName = entry.getKey();<\/p>\n<p>        String[] paramValues = entry.getValue();<\/p>\n<p>        \/\/ \u5bf9paramName\u548cparamValues\u8fdb\u884c\u5904\u7406<\/p>\n<p>    }<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u79cd\u65b9\u5f0f\u975e\u5e38\u9002\u5408\u9700\u8981\u5bf9\u8bf7\u6c42\u4e2d\u6240\u6709\u53c2\u6570\u8fdb\u884c\u6279\u91cf\u5904\u7406\u7684\u60c5\u51b5\u3002<\/p>\n<\/p>\n<p><h3>\u56db\u3001\u53c2\u6570\u89e3\u7801\u548c\u5b57\u7b26\u7f16\u7801\u95ee\u9898<\/h3>\n<\/p>\n<p><p>\u5728\u63a5\u6536\u67e5\u8be2\u53c2\u6570\u65f6\uff0c\u8fd8\u9700\u8981\u6ce8\u610f\u53c2\u6570\u7684\u7f16\u7801\u65b9\u5f0f\uff0c\u7279\u522b\u662f\u5bf9\u4e8e\u4e2d\u6587\u6216\u5176\u4ed6\u975eASCII\u5b57\u7b26\u3002\u4e3a\u4e86\u6b63\u786e\u63a5\u6536\u8fd9\u4e9b\u5b57\u7b26\uff0c\u53ef\u80fd\u9700\u8981\u5bf9\u8bf7\u6c42\u8fdb\u884c\u5b57\u7b26\u7f16\u7801\u7684\u8bbe\u7f6e\u3002\u4e00\u822c\u5728<code>doGet<\/code>\u6216<code>doPost<\/code>\u65b9\u6cd5\u4e2d\u8bbe\u7f6e\u8bf7\u6c42\u7684\u7f16\u7801\u65b9\u5f0f\uff0c\u5982\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-java\">request.setCharacterEncoding(&quot;UTF-8&quot;);<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5c06\u8bf7\u6c42\u7684\u5b57\u7b26\u7f16\u7801\u8bbe\u7f6e\u4e3aUTF-8\u53ef\u4ee5\u6709\u6548\u89e3\u51b3\u4e2d\u6587\u4e71\u7801\u7b49\u95ee\u9898\uff0c\u786e\u4fdd\u80fd\u591f\u6b63\u786e\u63a5\u6536\u548c\u5904\u7406\u8fd9\u4e9b\u53c2\u6570\u3002<\/p>\n<\/p>\n<p><p>\u7efc\u4e0a\u6240\u8ff0\uff0cJavaWeb\u5e94\u7528\u4e2d\u63a5\u6536\u67e5\u8be2\u53c2\u6570\u662f\u4e00\u4e2a\u57fa\u672c\u4f46\u975e\u5e38\u91cd\u8981\u7684\u529f\u80fd\u3002\u901a\u8fc7<code>HttpServletRequest<\/code>\u5bf9\u8c61\u63d0\u4f9b\u7684<code>getParameter<\/code>\u3001<code>getParameterValues<\/code>\u548c<code>getParameterMap<\/code>\u7b49\u65b9\u6cd5\uff0c\u53ef\u4ee5\u7075\u6d3b\u5730\u83b7\u53d6\u8bf7\u6c42\u4e2d\u643a\u5e26\u7684\u5404\u79cd\u53c2\u6570\u3002\u540c\u65f6\uff0c\u6b63\u786e\u5904\u7406\u53c2\u6570\u7684\u5b57\u7b26\u7f16\u7801\u4e5f\u662f\u786e\u4fdd\u5e94\u7528\u7a33\u5b9a\u8fd0\u884c\u7684\u5173\u952e\u3002\u7406\u89e3\u548c\u638c\u63e1\u8fd9\u4e9b\u6280\u80fd\u5c06\u6709\u52a9\u4e8e\u5f00\u53d1\u9ad8\u8d28\u91cf\u7684JavaWeb\u5e94\u7528\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>1. javaweb\u4e2d\u5982\u4f55\u63a5\u6536URL\u67e5\u8be2\u53c2\u6570\uff1f<\/strong><\/p>\n<p>\u5728javaweb\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528HttpServletRequest\u5bf9\u8c61\u7684getParameter()\u65b9\u6cd5\u6765\u63a5\u6536URL\u67e5\u8be2\u53c2\u6570\u3002\u8be5\u65b9\u6cd5\u63a5\u6536\u4e00\u4e2a\u5b57\u7b26\u4e32\u53c2\u6570\uff0c\u5373\u4e3a\u67e5\u8be2\u53c2\u6570\u7684\u540d\u79f0\uff0c\u8fd4\u56de\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u5373\u4e3a\u67e5\u8be2\u53c2\u6570\u7684\u503c\u3002\u4f8b\u5982\uff0c\u5982\u679c\u8981\u63a5\u6536\u540d\u4e3a\u201cid\u201d\u7684\u67e5\u8be2\u53c2\u6570\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n<pre><code class=\"language-java\">String id = request.getParameter(&quot;id&quot;);\n<\/code><\/pre>\n<p><strong>2. javaweb\u4e2d\u5982\u4f55\u63a5\u6536\u8868\u5355\u7684\u67e5\u8be2\u53c2\u6570\uff1f<\/strong><\/p>\n<p>\u8981\u63a5\u6536\u8868\u5355\u7684\u67e5\u8be2\u53c2\u6570\uff0c\u53ef\u4ee5\u4f7f\u7528HttpServletRequest\u5bf9\u8c61\u7684getParameter()\u65b9\u6cd5\u3002\u8be5\u65b9\u6cd5\u7684\u4f7f\u7528\u4e0e\u63a5\u6536URL\u67e5\u8be2\u53c2\u6570\u65f6\u5b8c\u5168\u76f8\u540c\u3002\u4f8b\u5982\uff0c\u5982\u679c\u8981\u63a5\u6536\u540d\u4e3a\u201cusername\u201d\u7684\u67e5\u8be2\u53c2\u6570\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n<pre><code class=\"language-java\">String username = request.getParameter(&quot;username&quot;);\n<\/code><\/pre>\n<p><strong>3. javaweb\u4e2d\u5982\u4f55\u63a5\u6536\u591a\u4e2a\u67e5\u8be2\u53c2\u6570\uff1f<\/strong><\/p>\n<p>\u5982\u679c\u6709\u591a\u4e2a\u67e5\u8be2\u53c2\u6570\u9700\u8981\u63a5\u6536\uff0c\u53ef\u4ee5\u4f7f\u7528HttpServletRequest\u5bf9\u8c61\u7684getParameterValues()\u65b9\u6cd5\u3002\u8be5\u65b9\u6cd5\u63a5\u6536\u4e00\u4e2a\u5b57\u7b26\u4e32\u53c2\u6570\uff0c\u5373\u4e3a\u67e5\u8be2\u53c2\u6570\u7684\u540d\u79f0\uff0c\u8fd4\u56de\u4e00\u4e2a\u5b57\u7b26\u4e32\u6570\u7ec4\uff0c\u5373\u4e3a\u8be5\u540d\u79f0\u5bf9\u5e94\u7684\u6240\u6709\u67e5\u8be2\u53c2\u6570\u7684\u503c\u3002\u4f8b\u5982\uff0c\u5982\u679c\u8981\u63a5\u6536\u540d\u4e3a\u201ccity\u201d\u7684\u591a\u4e2a\u67e5\u8be2\u53c2\u6570\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n<pre><code class=\"language-java\">String[] cities = request.getParameterValues(&quot;city&quot;);\n<\/code><\/pre>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cgetParameterValues()\u65b9\u6cd5\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\u6570\u7ec4\uff0c\u56e0\u6b64\u9700\u8981\u4f7f\u7528\u6570\u7ec4\u76f8\u5173\u7684\u64cd\u4f5c\u6765\u5904\u7406\u591a\u4e2a\u67e5\u8be2\u53c2\u6570\u7684\u503c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728JavaWeb\u4e2d\uff0c\u63a5\u6536\u67e5\u8be2\u53c2\u6570\u662f\u901a\u8fc7HTTP\u8bf7\u6c42\u4e2d\u7684\u67e5\u8be2\u5b57\u7b26\u4e32\u6765\u5b8c\u6210\u7684\u3002\u8fd9\u4e00\u6d41\u7a0b\u4e3b\u8981\u6d89\u53ca\u5230HttpServl 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