处理json工具类JacksonUtil详解编程语言

引用Maven库：

        <!-- Jackson --> 
        <dependency> 
            <groupId>com.fasterxml.jackson.core</groupId> 
            <artifactId>jackson-core</artifactId> 
            <version>2.4.3</version> 
        </dependency> 
        <dependency> 
            <groupId>com.fasterxml.jackson.core</groupId> 
            <artifactId>jackson-databind</artifactId> 
            <version>2.4.3</version> 
        </dependency>

代码细节：

public class JacksonUtil { 
 
    private static final Logger logger = LoggerFactory.getLogger(JacksonUtil.class); 
 
    private static final ObjectMapper objectMapper = new ObjectMapper(); 
 
    static { 
        /** 
         * 默认非空不输出，时间格式 
         */ 
        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL); 
        objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")); 
    } 
 
    /** 
     * 将 Java 对象转为 JSON 字符串 
     */ 
    public static <T> String toJSON(T obj) { 
        String jsonStr; 
        try { 
            jsonStr = objectMapper.writeValueAsString(obj); 
        } catch (Exception e) { 
            logger.error("Java 转 JSON 出错！", e); 
            throw new RuntimeException(e); 
        } 
        return jsonStr; 
    } 
 
    /** 
     * 将 JSON 字符串转为 Java 对象 
     */ 
    public static <T> T fromJSON(String json, Class<T> type) { 
        T obj; 
        try { 
            obj = objectMapper.readValue(json, type); 
        } catch (Exception e) { 
            logger.error("JSON 转 Java 出错！", e); 
            throw new RuntimeException(e); 
        } 
        return obj; 
    } 
}