JsonUtils工具类

public class JsonUtils {

// 定义jackson对象
private static final ObjectMapper MAPPER = new ObjectMapper();

/**
 * 将对象转换成json字符串。
 */
public static String objectToJson(Object data) {
    try {
        String string = MAPPER.writeValueAsString(data);
        return string;
    } catch (JsonProcessingException e) {
        e.printStackTrace();
    }
    return null;
}

/**
 * 将json结果集转化为对象
 */
public static <T> T jsonToPojo(String jsonData, Class<T> beanType) {
    try {
        T t = MAPPER.readValue(jsonData, beanType);
        return t;
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

/**
 * 将json数据转换成pojo对象list
 */
public static <T>List<T> jsonToList(String jsonData, Class<T> beanType) {
    JavaType javaType = MAPPER.getTypeFactory().constructParametricType(List.class, beanType);
    try {
        List<T> list = MAPPER.readValue(jsonData, javaType);
        return list;
    } catch (Exception e) {
        e.printStackTrace();
    }

    return null;
}

}