mvel探索-1

表达式

List orders = getOrder(orderID);foreach(order:orders){System.out.println('--user:');System.out.println(order.user.id+' '+order.user.name);System.out.println('--items:');double sum=0;foreach(item:order.items){p=OrderService.getProduct(item.productID);itemCost=item.number*p.price;System.out.println(item.id + '\t'+p.name + '\t' +item.number+'\t' + itemCost);sum+=itemCost;}System.out.println('--total:' +sum);}

代码

String exp = "...";ParserContext ctx = new ParserContext();ctx.addImport(List.class);ctx.addImport(OrderService.class);ctx.addImport(System.out.getClass());ctx.addImport("getOrder", OrderService.class.getMethod("getOrder",int.class));ctx.addImport("getProduct", OrderService.class.getMethod("getProduct",int.class));ctx.addImport("print", System.out.getClass().getMethod("print",String.class));Map map = new HashMap();map.put("orderID", 1);Serializable serialExp = MVEL.compileExpression(exp, ctx);MVEL.executeExpression(serialExp, map);