easy-rules json 文件格式rule定义

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();

参考资料

https://github.com/j-easy/easy-rules