這次就不帖完整代碼了，只說明json 格式以及核心代碼調用
json 格式
- 說明
就是一個json 數組,每個rule 的格式參考如下,需要包含name，condition,priority,actions ,description 不是必須的
{
"name": "3",
"description": "3",
"condition": "user.name.length<50",
"priority": 3,
"actions": [
"System.out.println(\"default rule3 \")"
]
}
- 一個參考多個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 \")"
]
}
]
代碼引用規則
easy-rules 提供了json 格式的解析
- easy-rules 代碼加載
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();