规则引擎 qlExpress的使用

1.qlExpress介绍可以参考此链接

https://github.com/alibaba/qlExpress

2.qlExpress的使用

import com.ql.util.express.*;
import org.junit.Before;
import org.junit.Test;

import java.util.ArrayList;
import java.util.List;

public class Demo {

    private ExpressRunner  runner = new ExpressRunner();

    // 如果性别为“男”，并且 分数 > 80分 那么此人授信500元  否则拒绝授信

    @Before
    public void init() throws Exception {
        //逻辑控制符号定义 
        runner.addOperatorWithAlias("如果", "if",null);
        runner.addOperatorWithAlias("则", "then",null);
        runner.addOperatorWithAlias("否则", "else",null);
        runner.addOperatorWithAlias("并且", "and",null);
        runner.addOperatorWithAlias("或者", "or",null);
        
        //指标项定义
        runner.addFunctionOfClassMethod("getAge",Demo.class.getName(),"getAge",new String[] {User.class.getName()},null);
        runner.addMacro("年龄", "getAge(user)");

        runner.addFunctionOfClassMethod("getJob",Demo.class.getName(),"getJob",new String[] {User.class.getName()},null);
        runner.addMacro("工作", "getJob(user)");

        // 自定义操作符号   join
        class JoinOperator extends Operator {
            public Object executeInner(Object[] list) throws Exception {
                Object opdata1 = list[0];
                Object opdata2 = list[1];
                if(opdata1 instanceof java.util.List){
                    ((java.util.List)opdata1).add(opdata2);
                    return opdata1;
                }else{
                    java.util.List result = new java.util.ArrayList();
                    result.add(opdata1);
                    result.add(opdata2);
                    return result;
                }
            }
        }
        runner.addOperator("join",new JoinOperator());

        // 自定义操作符  集合加
        class GroupOperator extends Operator {
            public GroupOperator(String aName) {
                this.name= aName;
            }
            public Object executeInner(Object[] list)throws Exception {
                Object result = Integer.valueOf(0);
                for (int i = 0; i < list.length; i++) {
                    result = OperatorOfNumber.add(result, list[i],false);//根据list[i]类型（string,number等）做加法
                }
                return result;
            }
        }
        runner.addFunction("group", new GroupOperator("group"));
    }

    @Test
    public void testDemo5() throws  Exception{
        String express = "group(1,2,3)";
        System.out.println("表达式计算：" + express + " 处理结果： " + runner.execute(express, null, null, false, false) );
    }


    public int getAge(User user){
        return user.getAge();
    }

    public String getJob(User user){
        return user.getJob();
    }
    
    // +,-,*,/,<,>,<=,>=,==,!=,<>【等同于!=】,%,mod【取模等同于%】,
    @Test
    public void testDemo1() throws Exception{
        ExpressRunner runner = new ExpressRunner();

        String express1 =  "((1+2) >= 3) == false";
        System.out.println("表达式计算：" + express1 + " 处理结果： " + runner.execute(express1, null, null, false, false) );

        String express2 =  "(5 mod 2) != 7";
        System.out.println("表达式计算：" + express2 + " 处理结果： " + runner.execute(express2, null, null, false, false) );
    }

    //  and(&&) or(||)  !(非)  in【类似sql】  like【类似sql】
    @Test
    public  void testDemo2() throws Exception{
        ExpressRunner runner = new ExpressRunner();
        String express1 = "!(false and true)";
        System.out.println("表达式计算：" + express1 + " 处理结果： " + runner.execute(express1, null, null, false, false) );

        String express2 = "5 in(1,2,3)";
        System.out.println("表达式计算：" + express2 + " 处理结果： " + runner.execute(express2, null, null, false, false) );
        
        String express3 = "'abc' like 'ab%'";
        System.out.println("表达式计算：" + express3 + " 处理结果： " + runner.execute(express3, null, null, false, false) );

    }

    
    public void permission(User user, String express) throws Exception {
        IExpressContext expressContext = new DefaultContext();
        expressContext.put("user",user);
        int result = (Integer)runner.execute(express, expressContext, null, false, false);
        System.out.println("用户"+user.getName()+"授信："+result);
    }
    
    // if then else
    @Test
    public void testDemo3() throws Exception{
        Demo demo = new Demo();
        demo.init();

        List ruleList = new ArrayList(); 
        String express1 = "如果 年龄< 18 则 0 否则 { 如果 年龄 < 30 则 500 否则 {如果 年龄 < 50 则 1000 否则 100}}";
        User user =   new User("张三",35,"农民");
        demo.permission(user,express1);

        String express2 = "如果 (如果 1==2 则 false 否则 true) 则 {2+2} 否则 {20 + 20}";
        System.out.println("表达式计算：" + express2 + " 处理结果： " + runner.execute(express2, null, null, false, false) );
    }

    @Test
    public void testDemo4() throws Exception {
        String express = "1 join 2 join 3";
        Object r = runner.execute(express, null, null, false, false);
        System.out.println("表达式计算：" + express + " 处理结果： " + runner.execute(express, null, null, false, false) );
    }

}

class User{
    private String name;
    private int age;
    private String job;

    public User(String name, int age, String job) {
        this.name = name;
        this.age = age;
        this.job = job;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getJob() {
        return job;
    }

    public void setJob(String job) {
        this.job = job;
    }
}

public class UserInfo {
    long id;
    long tag;
    String name;


    public UserInfo(long aId,String aName, long aUserTag) {
        this.id = aId;
        this.tag = aUserTag;
        this.name = aName;
    }
    public String getName(){
        return name;
    }
    public long getUserId() {
        return id;
    }

    public long getUserTag() {
        return tag;
    }

}

3.代码需要的jar包