{"id":174,"date":"2009-05-18T19:30:33","date_gmt":"2009-05-18T11:30:33","guid":{"rendered":"http:\/\/timyang.net\/?p=174"},"modified":"2009-05-18T19:53:26","modified_gmt":"2009-05-18T11:53:26","slug":"java-scripting","status":"publish","type":"post","link":"https:\/\/timyang.net\/java\/java-scripting\/","title":{"rendered":"\u4f7f\u7528\u811a\u672c\u5f15\u64ce\u589e\u52a0\u7a0b\u5e8f\u8fd0\u884c\u65f6\u52a8\u6001\u6267\u884c\u80fd\u529b(Java\u7bc7)"},"content":{"rendered":"

\u5bf9\u4e8e\u975eWeb\u7684\u540e\u53f0\u670d\u52a1\u7a0b\u5e8f\uff0c\u7ecf\u5e38\u4f1a\u78b0\u5230\u8fd9\u6837\u7684\u9700\u6c42\uff1a<\/p>\n

    \n
  1. \u52a8\u6001\u6539\u53d8\u7a0b\u5e8f\u8fd0\u884c\u65f6\u53c2\u6570\u7684\u80fd\u529b\u3002\u5982Config.limitValue = 50<\/li>\n
  2. \u52a8\u6001\u67e5\u770b\u8fd0\u884c\u65f6\u5019\u53d8\u91cf\u72b6\u6001\u7684\u80fd\u529b\uff0c\u5982 print(userMap.size())<\/li>\n
  3. \u6267\u884c\u4ee3\u7801\u7684\u80fd\u529b\uff0c\u5982 userMap.clear()<\/li>\n<\/ol>\n

    \u5bf9\u4e8e\u9700\u6c421,\u975eWeb\u7684\u7a0b\u5e8f\u6ca1\u6cd5\u50cfPHP\/JSP\u90a3\u6837\u76f4\u63a5\u6539\u5c31\u751f\u6548\uff0c\u5f80\u5f80\u6539\u4e86\u67d0\u4e2a\u503c\uff0c\u5373\u4f7f\u662f\u4e00\u4e2a\u914d\u7f6e\u53c2\u6570\u90fd\u9700\u8981\u670d\u52a1\u5668\u91cd\u542f\u4e00\u4e0b\u3002\u8fd9\u5bf9\u4e8e\u5f88\u591a\u7ebf\u4e0a\u670d\u52a1\u6765\u8bf4\u6210\u672c\u592a\u9ad8\u3002<\/p>\n

    \u5bf9\u4e8e\u4e0a\u8ff02\u7684\u9700\u6c42\uff0c\u901a\u5e38\u662f\u7f16\u5199\u5e9e\u5927\u7684\u540e\u53f0\u7ba1\u7406\u7a0b\u5e8f\u6765\u6ee1\u8db3\u3002\u6216\u8005\u662f\u901a\u8fc7\u589e\u52a0\u65e5\u5fd7\u8f93\u51fa\uff0c\u4f46\u95ee\u9898\u662f\u67d0\u4e9b\u53d8\u91cf\u53ea\u9700\u8981\u5076\u5c14\u624d\u770b\u4e00\u4e0b\uff0c\u56e0\u6b64\u5f88\u591a\u7cfb\u7edf\u4e2d\u5927\u90e8\u5206\u65e5\u5fd7\u5f00\u9500\u57fa\u672c\u4e0a\u662f\u65e0\u7528\u7684\u3002<\/p>\n

    \u5bf9\u4e8e\u9700\u6c423,\u53ea\u6709\u901a\u8fc7\u5728IDE\u7684debug\u6a21\u5f0f\u4e0b\u624d\u80fd\u8fbe\u5230\u3002<\/p>\n

    \u6211\u89c9\u5f97\u6240\u6709\u7684\u540e\u53f0\u7a0b\u5e8f\u90fd\u5e94\u8be5\u5177\u5907\u8fd9\u6837\u7684\u80fd\u529b\uff0c\u4e3a\u4e86\u6ee1\u8db3\u4ee5\u4e0a\u9700\u6c42\uff0c\u4e8e\u662f\u8003\u8651\u5728\u6240\u6709\u7a0b\u5e8f\u91cc\u9762\u5d4c\u5165\u4e00\u4e2a\u5c0f\u578b\u7684\u89e3\u91ca\u811a\u672c\u5f15\u64ce\u6765\u5b9e\u73b0\u3002\u5c31\u50cf\u5f88\u591a\u6e38\u620f\u7a0b\u5e8f\u5d4c\u5165Lua\/Python\u6765\u52a8\u6001\u6267\u884c\u4ee3\u7801\u76ee\u7684\u4e00\u6837\u3002<\/p>\n

    \u4eca\u5929\u5148\u8bf4\u4e0bJava\u4e2d\u7684\u5b9e\u73b0\u65b9\u6cd5\uff0c\u51e0\u5e74\u524d\u7528\u8fc7BeanShell<\/a>, \u53ef\u4ee5\u5728Java VM\u91cc\u9762\u89e3\u91ca\u6267\u884c\u591a\u79cd\u7c7b\u578b\u811a\u672c\u8bed\u8a00\u3002\u4f46\u662f\u53d1\u73b0\u5df2\u7ecf\u591a\u5e74\u4e0d\u66f4\u65b0\uff0c\u539f\u6765\u662fJava 6\u5df2\u7ecf\u5185\u5efaScripting\u7684\u652f\u6301\uff0c\u6240\u4ee5\u8fd9\u4e9b\u7b2c\u4e09\u65b9\u7684\u5de5\u5177\u4e5f\u90fd\u7ed3\u675f\u4e86\u5386\u53f2\u4f7f\u547d\u3002<\/p>\n

    Java 6\u81ea\u5e26\u7684\u5b9e\u9645\u4e0a\u662f Mozilla Rhino<\/a> \u7684Java Script\u5f15\u64ce\uff0c\u5b83\u4f7f\u7528JavaScript\u7684\u8bed\u6cd5\uff0c\u53ef\u4ee5\u8c03\u7528\u4efb\u610fJava\u4ee3\u7801\u3002<\/span><\/span>\u66f4\u591a\u4ecb\u7ecd\u89c1Java Scripting Programmer’s Guide<\/a>. Rhino\u9664\u4e86import\u5199\u6cd5\u6709\u70b9\u7279\u6b8a\u5916\uff0c\u57fa\u672c\u8bed\u6cd5\u548cJava\u4ee3\u7801\u57fa\u672c\u4e00\u81f4\u3002\u5982\uff1a<\/span><\/span><\/p>\n

    engine.eval(\"importClass(java.lang.System)\");\r\nengine.eval(\"println(System.currentTimeMillis())\");\r\nengine.eval(\"println('Source: https:\/\/timyang.net\/java\/java-scriptingjava-scripting\/<\/a>')\");<\/pre>\n
    \u4e8e\u662f\u505a\u4e86\u4e00\u4e2a\u7b80\u5355\u7684socket\u670d\u52a1\u5668\uff0c\u628a\u53d1\u8fc7\u6765\u7684\u6587\u672c\u76f4\u63a5\u6267\u884c\uff0c\u7136\u540e\u518d\u628a\u811a\u672c\u6267\u884c\u4ea7\u751f\u7684\u5185\u5bb9\u8fd4\u56de\u7ed9\u53d1\u9001\u65b9\u3002\u76ee\u6807\u8fbe\u6210\u3002\u517140\u4f59\u884c\u4ee3\u7801(\u5305\u62ec\u6ce8\u91ca\u548c\u82b1\u62ec\u53f7)\uff0c\u65e0\u9700\u4efb\u4f55\u7b2c\u4e09\u65b9library\u3002\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
    \/\/ create a script engine manager\r\nScriptEngineManager factory = new ScriptEngineManager();\r\n\/\/ create a JavaScript engine\r\nScriptEngine engine = factory.getEngineByName(\"JavaScript\");\r\n\r\nwhile (true) {\r\n    ServerSocket serverSocket = null;\r\n    try {\r\n        serverSocket = new ServerSocket(4444, 50, InetAddress.getByName(\"localhost\"));\r\n    } catch (IOException e) {\r\n        System.err.println(\"Could not listen on port: 4444.\");\r\n        System.exit(1);\r\n    }\r\n\r\n    Socket clientSocket = null;\r\n    try {\r\n        clientSocket = serverSocket.accept();\r\n    } catch (IOException e) {\r\n        System.err.println(\"Accept failed.\");\r\n        System.exit(1);\r\n    }\r\n\r\n    PrintWriter out = new PrintWriter(clientSocket.getOutputStream(),\r\n            true);\r\n    BufferedReader in = new BufferedReader(new InputStreamReader(\r\n            clientSocket.getInputStream()));\r\n    String inputLine, outputLine;\r\n\r\n    while ((inputLine = in.readLine()) != null) {\r\n        if (\"quit\".equals(inputLine))\r\n                break;\r\n        try {\r\n            \/\/ evaluate JavaScript code from String\r\n            out.println(engine.eval(inputLine));\r\n        } catch (Exception e) {\r\n            out.println(\"error:\" + e.getMessage());\r\n        }\r\n    }\r\n    out.close();\r\n    in.close();\r\n    clientSocket.close();\r\n    serverSocket.close();\r\n}<\/pre>\n
    \u542f\u52a8\u7a0b\u5e8f\u4e4b\u540e\u53ea\u8981 telnet localhost 4444 \u5c31\u53ef\u4ee5\u6267\u884c\u4efb\u610f\u4ee3\u7801\u5e76\u5b9e\u65f6\u67e5\u770b\u8fd4\u56de\u7ed3\u679c\u3002<\/p>\n
    \u6ce8\u610f\u4e0a\u9762\u4e3a\u4e86\u5b89\u5168\u8d77\u89c1\uff0c\u53ea\u7ed1\u5b9a\u4e86localhost\u5730\u5740\uff0c\u9632\u6b62\u6b64\u529f\u80fd\u88ab\u5916\u90e8\u7528\u6237\u6076\u610f\u4f7f\u7528\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u5bf9\u4e8e\u975eWeb\u7684\u540e\u53f0\u670d\u52a1\u7a0b\u5e8f\uff0c\u7ecf\u5e38\u4f1a\u78b0\u5230\u8fd9\u6837\u7684\u9700\u6c42\uff1a<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[156,40],"class_list":["post-174","post","type-post","status-publish","format-standard","hentry","category-java","tag-java","tag-scripting"],"_links":{"self":[{"href":"https:\/\/timyang.net\/wp-json\/wp\/v2\/posts\/174","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/timyang.net\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/timyang.net\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/timyang.net\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/timyang.net\/wp-json\/wp\/v2\/comments?post=174"}],"version-history":[{"count":7,"href":"https:\/\/timyang.net\/wp-json\/wp\/v2\/posts\/174\/revisions"}],"predecessor-version":[{"id":178,"href":"https:\/\/timyang.net\/wp-json\/wp\/v2\/posts\/174\/revisions\/178"}],"wp:attachment":[{"href":"https:\/\/timyang.net\/wp-json\/wp\/v2\/media?parent=174"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/timyang.net\/wp-json\/wp\/v2\/categories?post=174"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/timyang.net\/wp-json\/wp\/v2\/tags?post=174"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}