1、操作符和java对象操作
普通java语法
//支持 +,-,*,/,<,>,<=,>=,==,!=,<>【等同于!=】,%,mod【取模等同于%】,++,--,&&，||//in【类似sql】,like【类似sql】,&&,||,!,等操作符//and、or 和java里面的&& || 等价//支持for，break、continue、if then else 等标准的程序控制逻辑n=10;sum=0；for(i=0;i b?a:b;
java的对象操作
import com.ql.util.express.test.OrderQuery;//系统自动会import java.lang.*,import java.util.*;query = new OrderQuery();//创建class实例,会根据classLoader信息，自动补全类路径query.setCreateDate(new Date());//设置属性query.buyer = "张三";//调用属性,默认会转化为setBuyer("张三")result = bizOrderDAO.query(query);//调用bean对象的方法System.out.println(result.getId());//静态方法 提醒：不支持的java语法
- 不支持try{}catch{}
- 不支持java8的lambda表达式
- 不支持for循环集合操作for (GRCRouteLineResultDTO item : list)
- 弱类型语言，请不要定义类型声明
int a = 10; //-》转化后的逻辑a=10;FocFulfillDecisionReqDTO reqDTO = param.getReqDTO();//-》转化后的逻辑reqDTO = param.getReqDTO();//数组遍历for(GRCRouteLineResultDTO item : list) {}//-》转化后的逻辑for(i=0;i 2、脚本中定义function
function add(int a,int b){ return a+b;};function sub(int a,int b){ return a - b;};a=10;return add(a,4) + sub(a,9); 3、扩展操作符：Operator
替换if then else 等关键字
runner.addOperatorWithAlias("如果", "if",null);runner.addOperatorWithAlias("则", "then",null);runner.addOperatorWithAlias("否则", "else",null);exp = "如果 (语文+数学+英语>270) 则 {return 1;} 否则 {return 0;}";DefaultContext context = new DefaultContext ();runner.execute(exp,context,null,false,false,null); 如何自定义Operator
//定义一个继承自com.ql.util.express.Operator的操作符public 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; } }} 如何使用Operator
//(1)addOperatorExpressRunner runner = new ExpressRunner();DefaultContext context = new DefaultContext ();runner.addOperator("join",new JoinOperator());Object r = runner.execute("1 join 2 join 3", context, null, false, false);System.out.println(r);//返回结果 [1, 2, 3]//(2)replaceOperatorExpressRunner runner = new ExpressRunner();DefaultContext context = new DefaultContext ();runner.replaceOperator("+",new JoinOperator());Object r = runner.execute("1 + 2 + 3", context, null, false, false);System.out.println(r);//返回结果 [1, 2, 3]//(3)addFunctionExpressRunner runner = new ExpressRunner();DefaultContext context = new DefaultContext ();runner.addFunction("join",new JoinOperator());Object r = runner.execute("join(1,2,3)", context, null, false, false);System.out.println(r);//返回结果 [1, 2, 3]
4、绑定java类或者对象的method
addFunctionOfClassMethod+addFunctionOfServiceMethod
public class BeanExample { public static String upper(String abc) { return abc.toUpperCase(); } public boolean anyContains(String str, String searchStr) { char[] s = str.toCharArray(); for (char c : s) { if (searchStr.contains(c+"")) { return true; } } return false; }}runner.addFunctionOfClassMethod("取绝对值", Math.class.getName(), "abs", new String[] { "double" }, null);runner.addFunctionOfClassMethod("转换为大写", BeanExample.class.getName(), "upper", new String[] { "String" }, null);runner.addFunctionOfServiceMethod("打印", System.out, "println",new String[] { "String" }, null);runner.addFunctionOfServiceMethod("contains", new BeanExample(), "anyContains", new Class[] { String.class, String.class }, null);String exp = “取绝对值(-100);转换为大写(\"hello world\");打印(\"你好吗？\")；contains("helloworld",\"aeiou\")”;runner.execute(exp, context, null, false, false); ## 5、macro 宏定义
runner.addMacro("计算平均成绩", "(语文+数学+英语)/3.0");runner.addMacro("是否优秀", "计算平均成绩>90");IExpressContext context =new DefaultContext ();context.put("语文", 88);context.put("数学", 99);context.put("英语", 95);Object result = runner.execute("是否优秀", context, null, false, false);System.out.println(r);//返回结果true ## 6、编译脚本，查询外部需要定义的变量和函数。
注意以下脚本int和没有int的区别 String express = "int 平均分 = (语文+数学+英语+综合考试.科目2)/4.0;return 平均分";ExpressRunner runner = new ExpressRunner(true,true);String[] names = runner.getOutVarNames(express);for(String s:names){ System.out.println("var : " + s);}//输出结果：var : 数学var : 综合考试var : 英语var : 语文 7、关于不定参数的使用
@Test public void testMethodReplace() throws Exception { ExpressRunner runner = new ExpressRunner(); IExpressContext expressContext = new DefaultContext (); runner.addFunctionOfServiceMethod("getTemplate", this, "getTemplate", new Class[]{Object[].class}, null); //(1)默认的不定参数可以使用数组来代替 Object r = runner.execute("getTemplate([11,'22',33L,true])", expressContext, null,false, false); System.out.println(r); //(2)像java一样,支持函数动态参数调用,需要打开以下全局开关,否则以下调用会失败 DynamicParamsUtil.supportDynamicParams = true; r = runner.execute("getTemplate(11,'22',33L,true)", expressContext, null,false, false); System.out.println(r); } //等价于getTemplate(Object[] params) public Object getTemplate(Object... params) throws Exception{ String result = ""; for(Object obj:params){ result = result+obj+","; } return result; } 8、关于集合的快捷写法
@Test public void testSet() throws Exception { ExpressRunner runner = new ExpressRunner(false,false); DefaultContext context = new DefaultContext (); String express = "abc = NewMap(1:1,2:2); return abc.get(1) + abc.get(2);"; Object r = runner.execute(express, context, null, false, false); System.out.println(r); express = "abc = NewList(1,2,3); return abc.get(1)+abc.get(2)"; r = runner.execute(express, context, null, false, false); System.out.println(r); express = "abc = [1,2,3]; return abc[1]+abc[2];"; r = runner.execute(express, context, null, false, false); System.out.println(r); } 9、集合的遍历
其实类似java的语法，只是ql不支持for(obj:list){}的语法，只能通过下标访问。
//遍历ArrayList list = new ArrayList(); list.add("a"); list.add("b"); for (i=0;i //遍历map map = new HashMap(); map.put("a", "a_value"); map.put("b", "b_value"); keySet = map.keySet(); objArr = keySet.toArray(); for (i=0;i 10、布尔表达式的判断输出
如何判断整个表达式的返回结果，并且输出其中的逻辑子节点
( 2 < 1 ) and (违规天数 < 90 or 虚假交易扣分 < 12)
//简单初始化即可runner.getOperatorFactory().getOperator("<").setErrorInfo("$1 < $2 = false");runner.getOperatorFactory().getOperator(">").setErrorInfo("$1 > $2 = false"); runner.setShortCircuit(false);//可以设置是否启用逻辑短路，默认为true
详细case：