jackson 转换 enum 类型

REST API 接口要求 requster json 的 lifeCycle 域只能填 YOUNG, OLD,对于其他的 lifeCycle,都要给 requester 返回 bad request 消息。

 

public class DataCategory {
LifeCycle lifeCycle;

public void setLifeCycle(LifeCycle lifeCycle) {
this.lifeCycle = lifeCycle;
}

public LifeCycle getLifeCycle() {
return lifeCycle;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

String name;

public static void main(String args[]) {
DataCategory dc = new DataCategory();

dc.setName("name");
dc.setLifeCycle(LifeCycle.END_OF_SERVICE);

ObjectMapper objectMapper = new ObjectMapper();
System.out.println(dc.toString());

String jsonStr1 = "{\"lifeCycle\":\"END_OF_SERVICE\",\"name\":\"false\"}";

try {
DataCategory newDC = objectMapper.readValue(jsonStr1, DataCategory.class);
System.out.println(newDC.getLifeCycle());

System.out.println(String.valueOf(newDC.getLifeCycle()));
} catch (IOException e) {
e.printStackTrace();
}

try {
System.out.println(objectMapper.writeValueAsString(dc));
} catch (Exception e) {
e.printStackTrace();
}
}
}

 

 

 

jackson可以正常的进行序列化和反序列化。

但是插入到 mongodb 中时就报错,说序列化 class 失败。而getLifeCycle().toString()又不work。

因此使用 String.valueOf(getLifeCycle()) 来从 枚举类型转化到 String

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