MyEclipse8.5之Drools插件安装小结.docx

愿天下有情人终成眷属MyEclipse 8.5 之Drools插件安装小结Drools官方网址：/droolsDrools and jBPMconsist out of several projects:（Drools软件包提供的几个部分的功能）Drools Guvnor (Business Rules Manager)（规则集管理器）Drools Expert (rule engine) （规则引擎） jBPM5 (process/workflow) （工作流）Drools Fusion (event processing/temporal reasoning)（规则集引擎搜索与规划） Drools Planner (automated planning) （决策表） -MyEclipse 8.5安装Drools5.4.0.Final插件到Drools下载页面（/drools/downloads.html）-下载并解压Drools：drools-distribution-5.4.0.Final.zip（解压目录随意）-下载并解压插件：droolsjbpm-tools-distribution-5.4.0.Final.zip（解压目录随意）一安装插件- 打开 MyEclipse 8.5- 点 Helpsoftware and workspace Center- 点击 Software选项卡-点击 Browse Software 后面的add site- 点击 Add from Local Folder 并且选择./binaries/org.drools.updatesite （此目录在刚刚解压的插件中）- 在name中输入DroolsLocaluUpdateSite（名字随意起）-点击OK逐项选中右键 add - 点击Apply N（数字） changes 出现-点击Next-点击Update，直到安装完成。插件安装完后还需在MyEclipse 8.5中添加Drools的运行环境。二添加Drools的运行环境-点击WindowsPreferencess- 在窗口的树形菜单中选择DroolsInstalled Drools Runtimes- 在右边的空的Drools运行库列表中，点击Add- 在弹出窗口中name输入DroolsRuntime（随意起个名字），在Path选择./drools-distribution-5.4.0.Finaldrools-distribution-5.4.0.Finalbinaries（此目录在刚刚解压的Drools中 最好不要有中文），- 点击OK重新启动环境。即可进入下面测试-HelloWorld例子- NewProjectDrools Project输入项目名Next- 这里显示可以选择要生成的样例文件的类型（3种类型的6种样例文件：规则引擎样例的规则文件和java测试类；决策表开发的决策表文件和java测试类；工作流的流程文件和java测试类）。勾选规则引擎样例的规则文件和java测试类，点击Next- 进入到Drools运行时库的选择界面。环境搭建中已经设置了默认的运行时库，这里加载。然后选择编译代码所使用的规则引擎版本，这里选择Drools 5.1 or above，点击FinishSample.drl ：规则引擎的样例文件，该文件根据Drools规则语言语法编写Java代码 1. packagecom.sample 2. 3. importcom.sample.DroolsTest.Message; 4. 5. ruleHelloWorld6. when 7. /LHS块 8. /在workingMemory中，如果存在一个Message对象满足他的status属性等于Message.HELLO条件， 9. /就把满足条件的Message实例用变量m表示，他的message属性用myMessage表示，以便在RHS中使用。 10. m:Message(status=Message.HELLO,myMessage:message) 11. then 12. /RHS块 13. /在LHS中满足条件就运行RHS块。用到了LHS中的变量m，myMessage 14. System.out.println(myMessage); 15. m.setMessage(Goodbyecruelworld); 16. m.setStatus(Message.GOODBYE); 17. update(m);/表示把此Message实例在workingmemory中更新.这便会触发名称为GoodBye的rule, 18. end 19. 20. ruleGoodBye21. when 22. Message(status=Message.GOODBYE,myMessage:message) 23. then 24. System.out.println(myMessage); 25. endpackage com.sample import com.sample.DroolsTest.Message; rule Hello World when /LHS块 /在working Memory中，如果存在一个Message对象满足他的status属性等于Message.HELLO条件， /就把满足条件的Message实例用变量m表示，他的message属性用myMessage表示，以便在RHS中使用。 m : Message( status = Message.HELLO, myMessage : message ) then /RHS块 /在LHS中满足条件就运行RHS块。用到了LHS中的变量m，myMessage System.out.println( myMessage ); m.setMessage( Goodbye cruel world ); m.setStatus( Message.GOODBYE ); update( m );/表示把此Message实例在 working memory中更新.这便会触发名称为GoodBye的rule, endrule GoodBye when Message( status = Message.GOODBYE, myMessage : message ) then System.out.println( myMessage );endDroolsTest.java：java测试类，用来读取Sample.drl 并运行，该文件使用Drools规则引擎的API进行编写Java代码 1. packagecom.sample; 2. 3. importorg.drools.KnowledgeBase; 4. importorg.drools.KnowledgeBaseFactory; 5. importorg.drools.builder.KnowledgeBuilder; 6. importorg.drools.builder.KnowledgeBuilderError; 7. importorg.drools.builder.KnowledgeBuilderErrors; 8. importorg.drools.builder.KnowledgeBuilderFactory; 9. importorg.drools.builder.ResourceType; 10. importorg.drools.io.ResourceFactory; 11. importorg.drools.logger.KnowledgeRuntimeLogger; 12. importorg.drools.logger.KnowledgeRuntimeLoggerFactory; 13. importorg.drools.runtime.StatefulKnowledgeSession; 14. 15. /* 16. *Thisisasampleclasstolauncharule. 17. */18. publicclassDroolsTest 19. 20. publicstaticfinalvoidmain(Stringargs) 21. try 22. /loaduptheknowledgebase 23. KnowledgeBasekbase=readKnowledgeBase(); 24. StatefulKnowledgeSessionksession=kbase.newStatefulKnowledgeSession();/创建会话 25. KnowledgeRuntimeLoggerlogger=KnowledgeRuntimeLoggerFactory.newFileLogger(ksession,test); 26. /go! 27. Messagemessage=newMessage(); 28. message.setMessage(HelloWorld); 29. message.setStatus(Message.HELLO); 30. ksession.insert(message);/插入 31. ksession.fireAllRules();/执行规则 32. logger.close();/关闭 33. catch(Throwablet) 34. t.printStackTrace(); 35. 36. 37. 38. privatestaticKnowledgeBasereadKnowledgeBase()throwsException 39. KnowledgeBuilderkbuilder=KnowledgeBuilderFactory.newKnowledgeBuilder();/创建规则构建器 40. kbuilder.add(ResourceFactory.newClassPathResource(Sample.drl),ResourceType.DRL);/加载规则文件，并增加到构建器 41. KnowledgeBuilderErrorserrors=kbuilder.getErrors(); 42. if(errors.size()0)/编译规则过程中发现规则是否有错误 43. for(KnowledgeBuilderErrorerror:errors)System.out.println(规则中存在错误，错误消息如下：); 44. System.err.println(error); 45. 46. thrownewIllegalArgumentException(Couldnotparseknowledge.); 47. 48. KnowledgeBasekbase=KnowledgeBaseFactory.newKnowledgeBase();/创建规则构建库 49. kbase.addKnowledgePackages(kbuilder.getKnowledgePackages();/构建器加载的资源文件包放入构建库 50. returnkbase; 51. 52. 53. publicstaticclassMessage 54. 55. publicstaticfinalintHELLO=0; 56. publicstaticfinalintGOODBYE=1; 57. 58. privateStringmessage; 59. 60. privateintstatus; 61. 62. publicStringgetMessage() 63. returnthis.message; 64. 65. 66. publicvoidsetMessage(Stringmessage) 67. this.message=message; 68. 69. 70. publicintgetStatus() 71. returnthis.status; 72. 73. 74. publicvoidsetStatus(intstatus) 75. this.status=status; 76. 77. 78. 79. 80. package com.sample;import org.drools.KnowledgeBase;import org.drools.KnowledgeBaseFactory;import org.drools.builder.KnowledgeBuilder;import org.drools.builder.KnowledgeBuilderError;import org.drools.builder.KnowledgeBuilderErrors;import org.drools.builder.KnowledgeBuilderFactory;import org.drools.builder.ResourceType;import org.drools.io.ResourceFactory;import org.drools.logger.KnowledgeRuntimeLogger;import org.drools.logger.KnowledgeRuntimeLoggerFactory;import org.drools.runtime.StatefulKnowledgeSession;/* * This is a sample class to launch a rule. */public class DroolsTest public static final void main(String args) try / load up the knowledge base KnowledgeBase kbase = readKnowledgeBase(); StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();/创建会话 KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, test); / go ! Message message = new Message(); message.setMessage(Hello World); message.setStatus(Message.HELLO); ksession.insert(message);/插入 ksession.fireAllRules();/执行规则 logger.close();/关闭 catch (Throwable t) t.printStackTrace(); private static KnowledgeBase readKnowledgeBase() throws Exception KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();/创建规则构建器 kbuilder.add(ResourceFactory.newClassPathResource(Sample.drl), ResourceType.DRL);/加载规则文件，并增加到构建器 KnowledgeBuilderErrors errors = kbuilder.getErrors(); if (errors