目录

1. 过滤 json 数据

2. 格式化 json 数据

3. 扁平化对象

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1. 过滤 json 数据

@JsonIgnoreProperties 作用在类上用于过滤掉特定字段不返回或者不解析。

//生成json时将userRoles属性过滤
@JsonIgnoreProperties({"userRoles"})
public class User {
​private String userName;private String fullName;private String password;@JsonIgnoreprivate List<UserRole> userRoles = new ArrayList<>();
}

@JsonIgnore一般用于类的属性上，作用和上面的@JsonIgnoreProperties 一样。

public class User {
​private String userName;private String fullName;private String password;//生成json时将userRoles属性过滤@JsonIgnoreprivate List<UserRole> userRoles = new ArrayList<>();
}

2. 格式化 json 数据

@JsonFormat一般用来格式化 json 数据。：

比如：

@JsonFormat(shape=JsonFormat.Shape.STRING, pattern="yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", timezone="GMT")
private Date date;

3. 扁平化对象

@Getter
@Setter
@ToString
public class Account {@JsonUnwrappedprivate Location location;@JsonUnwrappedprivate PersonInfo personInfo;
​@Getter@Setter@ToStringpublic static class Location {private String provinceName;private String countyName;}@Getter@Setter@ToStringpublic static class PersonInfo {private String userName;private String fullName;}
}

未扁平化之前：

{"location": {"provinceName":"河北","countyName":"廊坊"},"personInfo": {"userName": "ww1234","fullName": "shanghai"}
}

使用@JsonUnwrapped 扁平对象之后：

@Getter
@Setter
@ToString
public class Account {@JsonUnwrappedprivate Location location;@JsonUnwrappedprivate PersonInfo personInfo;......
}

{"provinceName":"河北","countyName":"廊坊","userName": "ww1234","fullName": "shanghai"
}

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