JSON处理类

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import java.io.IOException;import java.io.StringReader;import java.io.StringWriter;import java.util.ArrayList;import java.util.Collection;import java.util.HashMap;import java.util.List;import java.util.Map;import com.fasterxml.jackson.core.JsonFactory;import com.fasterxml.jackson.core.JsonGenerator;import com.fasterxml.jackson.core.JsonParseException;import com.fasterxml.jackson.core.JsonParser;import com.fasterxml.jackson.databind.DeserializationFeature;import com.fasterxml.jackson.databind.ObjectMapper;/** *  * <b>类说明：</b>Jackson工具类 *  * <p> * <b>详细描述：</b> *  * @author liuhuanchao * @since  2016-04-18 */public class JacksonUtil {    private static final ObjectMapper MAPPER = new ObjectMapper();    static {        MAPPER.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);    }    private static final JsonFactory JSONFACTORY = new JsonFactory();    /**     * 转换Java Bean 为 json     */    public static String beanToJson(Object o) throws JsonParseException {        StringWriter sw = new StringWriter();        JsonGenerator jsonGenerator = null;        try {            jsonGenerator = JSONFACTORY.createJsonGenerator(sw);            MAPPER.writeValue(jsonGenerator, o);            return sw.toString();        } catch (Exception e) {            throw new RuntimeException(e+"转换Java Bean 为 json错误");        } finally {            if (jsonGenerator != null) {                try {                    jsonGenerator.close();                } catch (Exception e) {                    throw new RuntimeException(e+"转换Java Bean 为 json错误");                }            }        }    }    /**     * json 转 javabean     *     * @param json     * @return     */    @SuppressWarnings({ "unchecked", "rawtypes" })public static Object jsonToBean(String json, Class clazz) throws JsonParseException {        try {//        MAPPER.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);                    return MAPPER.readValue(json, clazz);        } catch (Exception e) {            throw new RuntimeException(e+"json 转 javabean错误");        }    }    /**     * 转换Java Bean 为 HashMap     */    @SuppressWarnings("unchecked")public static Map<String, Object> beanToMap(Object o) throws JsonParseException {        try {            return MAPPER.readValue(beanToJson(o), HashMap.class);        } catch (Exception e) {            throw new RuntimeException(e+"转换Java Bean 为 HashMap错误");        }    }    /**     * 转换Json String 为 HashMap     */    @SuppressWarnings("unchecked")public static Map<String, Object> jsonToMap(String json, boolean collToString) throws JsonParseException {        Map<String, Object> map = null;        try {            map = MAPPER.readValue(json, HashMap.class);        } catch (IOException e) {            throw new RuntimeException(e+"转换Java Bean 为 HashMap错误");        }        if (collToString) {            for (Map.Entry<String, Object> entry : map.entrySet()) {                if (entry.getValue() instanceof Collection || entry.getValue() instanceof Map) {                    entry.setValue(beanToJson(entry.getValue()));                }            }        }        return map;    }    /**     * List 转换成json     *     * @param list     * @return     */    public static String listToJson(List<Map<String, String>> list) throws JsonParseException {        JsonGenerator jsonGenerator = null;        StringWriter sw = new StringWriter();        try {            jsonGenerator = JSONFACTORY.createJsonGenerator(sw);            new ObjectMapper().writeValue(jsonGenerator, list);            jsonGenerator.flush();            return sw.toString();        } catch (Exception e) {            throw new RuntimeException(e+"List 转换成json错误");        } finally {            if (jsonGenerator != null) {                try {                    jsonGenerator.flush();                    jsonGenerator.close();                } catch (Exception e) {                    throw new RuntimeException(e+"List 转换成json错误");                }            }        }    }    /**     * json 转List     *     * @param json     * @return     */    @SuppressWarnings("unchecked")public static List<Map<String, String>> jsonToList(String json) throws JsonParseException {        try {            if (json != null && !"".equals(json.trim())) {                JsonParser jsonParse = JSONFACTORY.createJsonParser(new StringReader(json));                return (List<Map<String, String>>) new ObjectMapper().readValue(jsonParse, ArrayList.class);            } else {                throw new RuntimeException("json 转List错误");            }        } catch (Exception e) {            throw new RuntimeException(e+"json 转List错误");        }    }}
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