这次就不帖完整代码了，只说明json 格式以及核心代码调用
{
"name": "3",
"description": "3",
"condition": "user.name.length<50",
"priority": 3,
"actions": [
"System.out.println(\"default rule3 \")"
]
}
[{
"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 \")"
]
}
]
easy-rules 提供了json 格式的解析
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();
https://github.com/j-easy/easy-rules
原文：https://www.cnblogs.com/rongfengliang/p/12693489.html