java jackson 泛型_Jackson转换泛型List出现错误java.util.LinkedHashMap cannot be cast to com.xxx...

使用stackoverflow上的代码描述这个问题:

ObjectMapper mapper = new ObjectMapper();

List list = new ArrayList();

try {

list = mapper.readValue(con.getInputStream(), ArrayList.class);

} catch (JsonGenerationException e) {

e.printStackTrace();

} catch (JsonMappingException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

转换不会出现错误,但是获取具体数据时会抛出异常:

System.out.println(list.get(0));

System.out.println(list.get(0).getForename());

return list;

java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast to com.xxx.xxx.web.dto.rp.ConsultantDto异常信息很少。

解决办法:

List myObjects =

mapper.readValue(jsonInput, new TypeReference>(){});

原文:http://blog.csdn.net/wantken/article/details/42643901

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