使用jackson制作json工具类

pom文件：

    <dependency>
      <groupId>org.codehaus.jackson</groupId>
      <artifactId>jackson-core-asl</artifactId>
      <version>1.9.13</version>
    </dependency>
    <dependency>
      <groupId>org.codehaus.jackson</groupId>
      <artifactId>jackson-mapper-asl</artifactId>
      <version>1.9.13</version>
    </dependency>

    <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-lang3</artifactId>
      <version>3.5</version>
    </dependency>

JSON工具类：

@Slf4j
public class JsonMapper {

    private static ObjectMapper objectMapper = new ObjectMapper();

    static {
        // config 如果是空的字段，直接忽略
        objectMapper.disable(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES);
        objectMapper.configure(SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS, false);
        objectMapper.setFilters(new SimpleFilterProvider().setFailOnUnknownId(false));
        objectMapper.setSerializationInclusion(JsonSerialize.Inclusion.NON_EMPTY);
    }

    public static <T> String obj2String(T src) {
        if (src == null) {
            return null;
        }
        try {
            return src instanceof String ? (String) src : objectMapper.writeValueAsString(src);
        } catch (Exception e) {
            log.warn("parse object to String exception, error:{}", e);
            return null;
        }
        //objectMapper.writeValueAsString(src) 对象转换成json的string
    }

    public static <T> T string2Obj(String src, TypeReference<T> typeReference) {
        if (src == null || typeReference == null) {
            return null;
        }
        try {
            return (T) (typeReference.getType().equals(String.class) ? src : objectMapper.readValue(src, typeReference));
        } catch (Exception e) {
            log.warn("parse String to Object exception, String:{}, TypeReference<T>:{}, error:{}", src, typeReference.getType(), e);
            return null;
        }
        //objectMapper.readValue(src, typeReference) 把string src转换成对象
    }
}

• JsonMapper.obj2String(module)