我有JSON，具有不同级别的字段，因此我想转换为具有一个级别的字段的单个JSON，例如：
{
"prop1":"value1",
"prob2":"value2",
"prop3": {
"prop4":"value4",
"prop5":"value5"
}
... many level fields
}
结果
{
"prop1":"value1",
"prop2":"value2",
"prop4":"value4",
"prop5":"value5"
.......
}
我正在使用带有批注的Jackson @JsonProperty("field")，我对第一级字段没有问题，但是我不知道如何在JSON内部访问字段，例如prop4和prop5。
JsonUnwrapped是要使用的注释，它甚至适用于多层嵌套。例如：
@RunWith(JUnit4.class)
public class Sample {
@Test
public void testName() throws Exception {
SampleClass sample = new SampleClass("value1", "value2", new SubClass("value4", "value5", new SubSubClass("value7")));
new ObjectMapper().writeValue(System.out, sample);
}
@JsonAutoDetect(fieldVisibility=Visibility.ANY)
public static class SampleClass {
private String prop1;
private String prop2;
@JsonUnwrapped
private SubClass prop3;
public SampleClass(String prop1, String prop2, SubClass prop3) {
this.prop1 = prop1;
this.prop2 = prop2;
this.prop3 = prop3;
}
}
@JsonAutoDetect(fieldVisibility=Visibility.ANY)
public static class SubClass {
private String prop4;
private String prop5;
@JsonUnwrapped
private SubSubClass prop6;
public SubClass(String prop4, String prop5, SubSubClass prop6) {
this.prop4 = prop4;
this.prop5 = prop5;
this.prop6 = prop6;
}
}
@JsonAutoDetect(fieldVisibility=Visibility.ANY)
public static class SubSubClass{
private String prop7;
public SubSubClass(String prop7) {
this.prop7 = prop7;
}
}
}
会产生
{"prop1":"value1","prop2":"value2","prop4":"value4","prop5":"value5","prop7":"value7"}
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