Java 使用Jackson处理json 字符串值反序列化类型为集合时的报错处理 单个值自动转集合

public class Po {

    private Integer i;

    private List<String> list;

    private String str;

}

/**
 * 当json字符串中值为string类型 并无[]符号，且要反序列化为list时 使用该配置解决报错
 *
 * @author heasy
 **/
public class MyDeserializationProblemHandler extends DeserializationProblemHandler {

    @Override
    public Object handleUnexpectedToken(DeserializationContext ctxt, JavaType targetType, JsonToken token, JsonParser parser, String failureMsg) throws IOException {
        //处理json字符串 转 目标为数组 元素为字符串的情况
        if (token == JsonToken.VALUE_STRING && targetType.isCollectionLikeType()) {
            return deserializeString(targetType, parser);
        }
        //处理单个json对象 转 目标为数组 且元素为对象的情况
        if (token == JsonToken.START_OBJECT && targetType.isCollectionLikeType()) {
            return deserializeObject(targetType, parser);
        }
        return super.handleUnexpectedToken(ctxt, targetType, token, parser, failureMsg);
    }


    private Object deserializeObject(JavaType targetType, JsonParser parser) throws IOException {
        List<Object> list = new ArrayList<>(1);
        final Class<?> rawClass = targetType.getContentType().getRawClass();
        final Object o = ReflectUtil.newInstanceIfPossible(rawClass);
        while (parser.getCurrentToken() != JsonToken.END_OBJECT) {
            if (parser.getText().equals(JsonToken.START_OBJECT.asString())) {
                parser.nextToken();
                continue;
            }
            String field = parser.getText();
            parser.nextToken();
            String value = parser.getText();
            if (ReflectUtil.hasField(rawClass, field)) {
                ReflectUtil.setFieldValue(o, field, value);
            }
            parser.nextToken();
        }
        list.add(o);
        return list;
    }

    private Object deserializeString(JavaType listType, JsonParser parser) throws IOException {
        String[] values = parser.getText().split(",");

        JavaType itemType = listType.getContentType();

        List<Object> result = new ArrayList<>(values.length);
        for (String value : values) {
            final String json = "\"" + value.trim() + "\"";
            final Object o = JsonUtil.fromJson(json, itemType);
            result.add(o);
        }

        return result;
    }


}

objectMapper.addHandler(new MyDeserializationProblemHandler());