刚刚接触drools，自己写了drl文件，但是没有得到预期结果，请各位前辈指教
我对规则这方面的编码都不会，刚开始做，一点都摸不着门，请各位前辈帮帮忙。谢谢了。IDE是eclipse3.0
我的代码特别简单，就是想试试先使规则引擎转起来，下面是我的一个类
package test.mis.action;
public class PeopleValid {
private int peopleId;
private String msg;
public int getId () {
return peopleId;
}
public void setId (int Id) {
this.peopleId = Id;
}
public String getMsg () {
return msg;
}
public void setMsg (String m) {
this.msg = m;
System.out.println(m);
}
}
下面是我的drl文件：
package TestRules
#list any import classes here.
import Test.mis.action.*
#declare any global variables here
rule "First Rule"
when
#conditions
$p:PeopleValid()
eval($p.getId==5)
then
#actions
System.out.println("12345")
end
下面是我的测试代码：
package test.rules.engine.test;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Reader;
import java.util.List;
import org.drools.RuleBase;
import org.drools.RuleBaseFactory;
import org.drools.WorkingMemory;
import org.drools.compiler.PackageBuilder;
import org.drools.rule.Package;
import test.mis.action.*;
public class RuleEngineTest
{
private String ruleName;
private RuleBase ruleBase;
private WorkingMemory memory;
private static String msg = "Initiated!";
// 用来测试规则路径的正确性和执行情况。
public static void main(String[] args) throws Exception
{
PeopleValid people = new PeopleValid();
System.err.println("已创建对象！");
people.setId(5);
System.err.println(people.getId());
System.err.println("已赋值！");
RuleEngineTest testEngine = new RuleEngineTest();
testEngine.setRuleName("/test\\rules\\drl\\TestRules.drl");
testEngine.init(people);
System.err.println("------------------------------");
testEngine.getMemory().fireAllRules();
System.out.println(people.getMsg());
System.out.println(msg);
System.err.println("规则成功执行!!!");
}
public void init(PeopleValid p) throws Exception
{
long start1, finish1;
long start2, finish2;// 测试响应时间用的变量
start1 = System.currentTimeMillis();
readRule();
finish1 = System.currentTimeMillis();
System.err.println("readRule需要的时间: " + (finish1 - start1));
start1 = System.currentTimeMillis();
ObjectInputStream oIn = new ObjectInputStream(new FileInputStream("src\\test\\rules\\pkg\\TestRules.pkg"));
Package pkg = (Package)oIn.readObject();
finish1 = System.currentTimeMillis();
System.err.println("解析Package文件流需要的时间: " + (finish1 - start1));
// add the package to a rulebase (deploy the rule package).
start1 = System.currentTimeMillis();
// 生成一个RuleBase实例并bore一个workingMemory
ruleBase = RuleBaseFactory.newRuleBase();
memory = ruleBase.newWorkingMemory();
ruleBase.addPackage(pkg);
// 并且初始化一个WorkingMemory
finish1 = System.currentTimeMillis();
System.err.println("从pkg加载规则文件需要的时间: " + (finish1 - start1));
memory.assertObject(p);
System.err.println("调用规则！");
}
public void tearDown()
{
// 销毁工作内存
memory.clearAgenda();
memory.dispose();
}
public void readRule() throws Exception
{
// read in the source
Reader input = new InputStreamReader(RuleEngineTest.class
.getResourceAsStream(ruleName));
PackageBuilder builder = new PackageBuilder();
long start = System.currentTimeMillis();
builder.addPackageFromDrl(input);
long finish = System.currentTimeMillis();
System.err.println("编译规则文件需要的时间："+(finish-start));
start = System.currentTimeMillis();
Package pkg = builder.getPackage();
ObjectOutputStream oOut = new ObjectOutputStream(new FileOutputStream("src\\test\\rules\\pkg\\TestRules.pkg"));
oOut.writeObject(pkg);
finish = System.currentTimeMillis();
System.err.println("串行化pkg文件需要的时间："+(finish-start));
}
public WorkingMemory getMemory()
{
return memory;
}
public RuleBase getRuleBase()
{
return ruleBase;
}
public void setRuleName(String ruleName)
{
this.ruleName = ruleName;
}
}
运行之后就出这样的错误：
已创建对象！
5
已赋值！
Exception in thread "main" java.lang.NoClassDefFoundError: Test/mis/action/PeopleValid (wrong name: test/mis/action/PeopleValid)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.drools.rule.PackageCompilationData$PackageClassLoader.loadClass(PackageCompilationData.java:329)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.codehaus.jfdi.interpreter.ClassTypeResolver.importClass(ClassTypeResolver.java:232)
at org.codehaus.jfdi.interpreter.ClassTypeResolver.resolveType(ClassTypeResolver.java:165)
at org.drools.semantics.java.builder.ColumnBuilder.build(ColumnBuilder.java:98)
at org.drools.semantics.java.builder.GroupElementBuilder.build(GroupElementBuilder.java:71)
at org.drools.semantics.java.RuleBuilder.build(RuleBuilder.java:178)
at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:381)
at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:219)
at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:148)
at test.rules.engine.test.RuleEngineTest.readRule(RuleEngineTest.java:130)
at test.rules.engine.test.RuleEngineTest.init(RuleEngineTest.java:56)
at test.rules.engine.test.RuleEngineTest.main(RuleEngineTest.java:43)
[解决办法]
import的package名称写错了，将drl文件中的import Test.mis.action.* 改为import test.mis.action.* 应该就可以了
[解决办法]
还有你用的语法好像是很早版本以前的drools，你去下一个新的drools4.2吧 已经不用WorkMemory了，现在的方法是StatefulSession。建议你去下一个drool的使用手册，好像是有中文的，多看看里面的例子，自己好好想一下，测试一下，很容易掌握的 ：）
[解决办法]
eval 一般是用来调用在Rule 中定义的函数的。
Eval本质上是一个大杂烩（catch all），它允许任何语义代码被执行，只要最后返回一个boolean值。这可以涉及在规则LHS中绑定的变量和在规则Package中定义的函数。使用eval可以减少规则的声明情况以及用一个低性能的引擎获得结果。‘eval’可以在模式的任意位置使用，但最好的方式是作为规则LHS中最后的条件元素增加。(选之《Drools4.0官方使用手册中文》)
我一直是把它当成一个执行表达式的一个方法，什么都可以用。我最常用它来判断数组或list中的某个值是否满足条件 呵呵~~
[解决办法]
() 里使用的是你的Fields 而非Property
[解决办法]
至于你说的语法手册，我好像有3.1 的，4.0 的不是电子文档。你可以在JBOSS社区下载
[解决办法]
中英文的drools文档，pm给我你的邮箱，我发给你
