Jackson检测重复的JSON POJO属性和映射键
我正在尝试捕获重复的POJO属性或映射键是否已通过我的Web服务 例如,如果Jackson检测重复的JSON POJO属性和映射键,json,jackson,Json,Jackson,我正在尝试捕获重复的POJO属性或映射键是否已通过我的Web服务 例如,如果field1出现两次或map key1出现两次,我想抛出一个错误: { "field1" : 1, "field1" : 2, "map" : { "1" : { "fieldA" : "null", "fieldB" : "2" }, "1" : { "fieldX" : "null", "fieldY" : "2" } }
field1
出现两次或map key1
出现两次,我想抛出一个错误:
{
"field1" : 1,
"field1" : 2,
"map" : {
"1" : {
"fieldA" : "null",
"fieldB" : "2"
},
"1" : {
"fieldX" : "null",
"fieldY" : "2"
}
}
}
请看下面的讨论: 下面是一个Map类的示例代码:
public class JacksonDuplicates {
private static final String JSON = "{\n" +
" \"field1\" : 1,\n" +
" \"field1\" : 2,\n" +
" \"map\" : {\n" +
" \"1\" : {\n" +
" \"fieldA\" : \"null\",\n" +
" \"fieldB\" : \"2\"\n" +
" },\n" +
" \"1\" : {\n" +
" \"fieldX\" : \"null\",\n" +
" \"fieldY\" : \"2\"\n" +
" }\n" +
" }\n" +
"}";
private static class SingleKeyHashMap<K, V> extends HashMap<K, V> {
@Override
public V put(K key, V value) {
if (containsKey(key)) {
throw new IllegalArgumentException("duplicate key " + key);
}
return super.put(key, value);
}
}
public static void main(String[] args) throws IOException {
SimpleModule module = new SimpleModule();
module.addAbstractTypeMapping(Map.class, SingleKeyHashMap.class);
ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(module);
mapper.readValue(JSON, Map.class);
}
}
可以使用
JsonParser.Feature.STRICT\u DUPLICATE\u检测
ObjectMapper mapper = new ObjectMapper();
mapper.enable(JsonParser.Feature.STRICT_DUPLICATE_DETECTION);
MyPOJO result = mapper.readValue(json, MyPOJO.class);
结果:
com.fasterxml.jackson.core.JsonParseException: Duplicate field 'field1'
发布关于反序列化功能的帖子。读取DUP树键失败
如何在JAX-RS应用程序中配置此功能?根据您的用例,有几种方法可以实现这一点。例如,描述了如何为给定的mime类型配置对象映射器。我认为我找到了一个技术上可行的解决方案,但它是一个黑客。瓦伦的答案是“正确的”。
com.fasterxml.jackson.core.JsonParseException: Duplicate field 'field1'