这次就不帖完整代码了，只说明json 格式以及核心代码调用
json 格式
- 说明
就是一个json 数组,每个rule 的格式参考如下,需要包含name，condition,priority,actions ,description 不是必须的
{
"name": "3",
"description": "3",
"condition": "user.name.length<50",
"priority": 3,
"actions": [
"System.out.println("default rule3 ")"
]
}
- 一个参考多个rule 的json 文件
[{
"name": "1",
"description": "1",
"priority": 1,
"compositeRuleType": "UnitRuleGroup",
"composingRules": [
{
"name": "2",
"description": "2",
"condition": "user.getAge()<28",
"priority": 2,
"actions": [
"System.out.println("UnitRuleGroup not ok rule2 ")"
]
},
{
"name": "3",
"description": "3",
"condition": "user.name.length<10",
"priority": 3,
"actions": [
"System.out.println("UnitRuleGroup rule3 ")"
]
},
{
"name": "4",
"description": "4",
"condition": "user.name.length<10",
"priority": 4,
"actions": [
"System.out.println("UnitRuleGroup rule4 ")"
]
},
{
"name": "5",
"description": "5",
"condition": "user.name.length<10",
"priority": 5,
"actions": [
"System.out.println("UnitRuleGroup rule5 ");UserService.doAction4(user.userinfo)"
]
}
]},
{
"name": "3",
"description": "3",
"condition": "user.name.length<50",
"priority": 3,
"actions": [
"System.out.println("default rule3 ")"
]
}
]
代码引用规则
easy-rules 提供了json 格式的解析
- easy-rules 代码加载
MVELRuleFactory ruleFactory = new MVELRuleFactory(new JsonRuleDefinitionReader());
ParserContext context =new ParserContext();
context.addImport("UserService", UserService.class);
Rules yamlRules = ruleFactory.createRules(new FileReader(Launcher.class.getClassLoader().getResource("json-rule.json").getFile()),context);
DefaultRulesEngine rulesEngine = new DefaultRulesEngine();