Jexl 字符串转表达式

Posted 2022-10-12 正怒月神

一 POM

<dependency>
                <groupId>org.apache.commons</groupId>
                <artifactId>commons-jexl3</artifactId>
                <version>3.2.1</version>
            </dependency>

二 封装

public class DyMethodUtil 
    public static Object invokeMethod(String jexlExp, Map<String,Object> map) 
        JexlEngine jexl = new JexlBuilder().create();
        JexlExpression e = jexl.createExpression(jexlExp);
        JexlContext jc = new MapContext();
        for (String key : map.keySet()) 
            jc.set(key, map.get(key));
        
        if (null == e.evaluate(jc)) 
            return "";
        
        return e.evaluate(jc);

    

三 提供jexl调用的测试方法

public class TestUtil 
    public String getBooking(String name)
        return name+"111";
    

四 测试

    @Autowired
    SfOrderService sfOrderService;


/**
     * jexl 调用字符串的equals方法
     */
    @Test
    public void Test3Jexl() 
        Map<String,Object> map=new HashMap();
        map.put("test","hello");
        String expression="test.equals('hello')";
        Object obj = DyMethodUtil.invokeMethod(expression,map);
        System.out.println(obj);

        String expression1="test.equals('hello111')";
        Object obj1 = DyMethodUtil.invokeMethod(expression1,map);
        System.out.println(obj1);

    

    /**
     * jexl 调用某个service的方法
     */
    @Test
    public void Test4Jexl() throws ScriptException 
        SfOrder_Req req=new SfOrder_Req();
        req.setOrderUUID("2c92808a833aab5501833b048ff10044");

        Map<String,Object> map=new HashMap();
        map.put("sfOrderService",sfOrderService);
        map.put("req",req);
        String expression="sfOrderService.find(req)";
        Object obj = DyMethodUtil.invokeMethod(expression,map);
        System.out.println(obj);
    

    /**
     * jexl 调用一个方法，并且进行判断
     */
    @Test
    public void Test5Jexl()
        TestUtil testUtil=new TestUtil();
        String name="hello";
        Map<String,Object> map=new HashMap();
        map.put("testUtil",testUtil);
        map.put("name",name);
        String expression="testUtil.getBooking(name)!=null && testUtil.getBooking(name).length()>5";
        Object obj = DyMethodUtil.invokeMethod(expression,map);
        System.out.println(obj);