drools引擎使用决策表

前提准备：java 虚拟机
Drools核心库
Junit4.0以上版本
规则Excel模板表（将下面的图片的内容新建到Excel中）
典型的用法就是根据excel创建KnowledgeBase,然后将它丢给session执行，执行的参数和结果都在params里面

package com.xxx.yyyy;
  2
  3 import java.io.File;
  4 import java.io.FileInputStream;
  5 import java.io.InputStream;
  6 import java.util.Arrays;
  7 import java.util.Collection;
  8 import java.util.HashMap;
  9 import java.util.Map;
10 import junit.framework.Assert;
11 import org.drools.KnowledgeBase;
12 import org.drools.KnowledgeBaseFactory;
13 import org.drools.builder.DecisionTableConfiguration;
14 import org.drools.builder.DecisionTableInputType;
15 import org.drools.builder.KnowledgeBuilder;
16 import org.drools.builder.KnowledgeBuilderFactory;
17 import org.drools.builder.ResourceType;
18 import org.drools.definition.KnowledgePackage;
19 import org.drools.io.ResourceFactory;
20 import org.drools.runtime.StatelessKnowledgeSession;
21 import org.junit.Test;
22 import org.junit.runner.RunWith;
23 import org.junit.runners.Parameterized;
24 import org.junit.runners.Parameterized.Parameters;
25
26 @RunWith(Parameterized. class)
27 public class IsP4PTest
28 {
29      private IsP4P param;
30
31      private String extected;
32
33      public IsP4PTest(IsP4P param, String extected)
34     {
35          this.param = param;
36          this.extected = extected;
37     }
38 public Map<String, Object> getParams()
39         {
40             Map<String, Object> params = new HashMap<String, Object>();
41
42             params.put("productLine", productLine);
43             params.put("productType", productType);
44             params.put("playType", playType);
45
46              return params;
47         }
48 public void testExcel(String fileName, Map<String, Object> params)
49              throws Exception
50     {
51         System.out.println("---------------begin------------------------");
52
53         DecisionTableConfiguration dtableconfiguration = KnowledgeBuilderFactory
54                 .newDecisionTableConfiguration();
55 dtableconfiguration.setInputType(DecisionTableInputType.XLS);
56          final KnowledgeBuilder kbuilder = KnowledgeBuilderFactory
57                 .newKnowledgeBuilder();
58 File file = new File(
59                 "F:\\juny.qu\\rule_workspace\\com.deppon.rules\\src\\main\\java\\com\\xxx\\yyyy\\"
60                         + fileName);
61         InputStream is = new FileInputStream(file);
62 kbuilder.add(ResourceFactory.newInputStreamResource(is, "UTF-8"),
63                 ResourceType.DTABLE);
64          if (kbuilder.hasErrors())
65         {
66             System.out.println(kbuilder.getErrors().toString());
67         }
68 Collection<KnowledgePackage> pkgs = kbuilder.getKnowledgePackages();
69         KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
70         kbase.addKnowledgePackages(pkgs);
71
72 StatelessKnowledgeSession ksession = kbase
73                 .newStatelessKnowledgeSession();
74         ksession.execute(Arrays.asList( new Object[] { params }));
75
76 System.out.println("---------------end------------------------");
77 }
78
79
80 @Parameters
81      public static Collection<?> contructData()
82     {
83 return Arrays.asList( new Object[][] {
84                 { new IsP4P("搜索推广", "true", "null"), "true" },
85                 { new IsP4P("网盟推广", "true", "null"), "true" },
86                 { new IsP4P("掘金推广", "true", "非轮播"), "false" },
87                 { new IsP4P("其他", "false", "其他"), "other" } });
88 }
89
90 @Test
91      public void testP4P() throws Exception
92     {
93         Map<String, Object> params = new HashMap<String, Object>();
94         params.putAll(param.getParams());
95         testExcel("ka/isP4P.xls", params);
96         Assert.assertEquals(extected, params.get("isP4P"));
97     }
98 }
99
100

1 package com.xxx.yyyy;
2
3 import java.io.File;
4 import java.io.FileInputStream;
5 import java.io.FileNotFoundException;
6 import java.io.InputStream;
7
8 import org.drools.decisiontable.InputType;
9 import org.drools.decisiontable.SpreadsheetCompiler;
10 import org.junit.Test;
11
12 public class SpreadsheetCompilerTest {
13
14 @Test
15     public void compile() throws FileNotFoundException{
16         //File file = new File("F:\\juny.qu\\rule_workspace\\com.deppon.rules\\src\\main\\java\\com\\xxx\\yyyy\\ka\\isP4P.xls");
17         //File file = new File("F:\\collections_study\\规则引擎系统开发小组\\规则引擎doc\\02开发\\06-详细设计\\增值服务折扣测试1.xls");
18         File file = new File("F:\\rules.xlsx");
19
20         InputStream is = new FileInputStream(file);
21
22         SpreadsheetCompiler converter = new SpreadsheetCompiler();
23         String drl = converter.compile(is, InputType.XLS); //--------exception here--------
24         System.out.println("\n\n" + drl);
25
26     }
27
28 }

运行结果如下： package rule_table;

//generated from Decision Table
import java.util.*;
// rule values at B22, header at B17
rule "ContractP4P_22"
when
$constract:java.util.HashMap($constract.get("productLine")=="搜索推广")
$constract.get("productType")=="true"
$constract.get("playType")=="null"
then
$constract.put("isP4P","true");
end
// rule values at B23, header at B17
rule "ContractP4P_23"
when
$constract.get("playType")=="null"
then
$constract.put("isP4P","true");
end
// rule values at B24, header at B17
rule "ContractP4P_24"
when
$constract:java.util.HashMap($constract.get("productLine")=="掘金推广")
$constract.get("productType")=="true"
$constract.get("playType")=="非轮播"
then
$constract.put("isP4P","false");
end
// rule values at B25, header at B17
rule "ContractP4P_25"
when
$constract:java.util.HashMap($constract.get("productLine")=="其他")
$constract.get("productType")=="false"
$constract.get("playType")=="其他"
then
$constract.put("isP4P","other");
end

什么时候考虑使用规则表

如果规则可以表示成 templates+data(模板＋数据),可以考虑使用 decision tables。在决策表的每一行，采集数据和模板一起生成规则。使用基于决策表的Spreadsheet的API在Drools-decisiontables模块中。只有一个类：SpreadsheetCompiler. 这个类可以操作各种格式的Spreadsheet，并生成DRL规则（然后就可以常规的方式使用）。


一个典型的规则表的格式


 
决策表中的关键字说明：

drools引擎使用决策表

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