关于如何快速初始化Java的复杂集合对象问题

Love The Way You Lie 2021-12-15 23:45 297阅读 0赞

# **最快的方法就是手写Json格式的List<VO>，然后转成List<VO>对象** #

**代码示例，如何快速初始化这个对象的List集合**

public class State {
    
        @Id
        private Integer id;
    
        @Column(name = "ch_name")
        private String chName;
    
        @Column(name = "en_name")
        private String enName;
    
        private String code;
    
        private String capital;
    
        private String capitalen;
    
        private String remark;
    
    
    }

对于这个List《VO》有这个数据

[
    State(id=1, chName=E, enName=D, code=C, captial=B, capitalen=A, remark=F), 
    State(id=1, chName=E, enName=D, code=C, captial=B, capitalen=A, remark=F), 
    State(id=1, chName=E, enName=D, code=C, captial=B, capitalen=A, remark=F), 
    State(id=1, chName=E, enName=D, code=C, captial=B, capitalen=A, remark=F),
    State(id=1, chName=E, enName=D, code=C, captial=B, capitalen=A, remark=F)
    ]

转成Json后

[
    {"capitalen":"A","code":"C","enName":"D","remark":"F","id":1,"captial":"B","chName":"E"},
    {"capitalen":"A","code":"C","enName":"D","remark":"F","id":1,"captial":"B","chName":"E"},
    {"capitalen":"A","code":"C","enName":"D","remark":"F","id":1,"captial":"B","chName":"E"},
    {"capitalen":"A","code":"C","enName":"D","remark":"F","id":1,"captial":"B","chName":"E"},
    {"capitalen":"A","code":"C","enName":"D","remark":"F","id":1,"captial":"B","chName":"E"}
    ]

# 怎么实现呢？ #

### 我们可以方便初始化一个JsonArray对象，然后用工具类解析生成List<Vo>对象 ###

List<State> states = JSONUtil.toList(new JSONArray("[" +
                    "{\"capitalen\":\"A\",\"code\":\"C\",\"enName\":\"D\",\"remark\":\"F\",\"id\":1,\"capital\":\"B\",\"chName\":\"E\"}," +
                    "{\"capitalen\":\"A\",\"code\":\"C\",\"enName\":\"D\",\"remark\":\"F\",\"id\":1,\"capital\":\"B\",\"chName\":\"E\"}," +
                    "{\"capitalen\":\"A\",\"code\":\"C\",\"enName\":\"D\",\"remark\":\"F\",\"id\":1,\"capital\":\"B\",\"chName\":\"E\"}," +
                    "{\"capitalen\":\"A\",\"code\":\"C\",\"enName\":\"D\",\"remark\":\"F\",\"id\":1,\"capital\":\"B\",\"chName\":\"E\"}," +
                    "{\"capitalen\":\"A\",\"code\":\"C\",\"enName\":\"D\",\"remark\":\"F\",\"id\":1,\"capital\":\"B\",\"chName\":\"E\"}" +
                    "]"), State.class);

[
    State(id=1, chName=E, enName=D, code=C, capital=B, capitalen=A, remark=F), 
    State(id=1, chName=E, enName=D, code=C, capital=B, capitalen=A, remark=F), 
    State(id=1, chName=E, enName=D, code=C, capital=B, capitalen=A, remark=F), 
    State(id=1, chName=E, enName=D, code=C, capital=B, capitalen=A, remark=F), 
    State(id=1, chName=E, enName=D, code=C, capital=B, capitalen=A, remark=F)
    ]

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### 然后就可以用工具类快速转成List《vo》对象了 ###

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