package kernel.util;
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import org.codehaus.jackson.JsonNode;
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import org.codehaus.jackson.JsonParser.Feature;
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import org.codehaus.jackson.map.DeserializationConfig;
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import org.codehaus.jackson.map.ObjectMapper;
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import org.codehaus.jackson.type.TypeReference;
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/**
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*
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* <p>
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* Title:
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* </p>
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*
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* <p>
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* Description:json工具類
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* </p>
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*/
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public class JsonUtils {
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/**
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* 转成JSON字符串
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*
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* @param obj
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* @return
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*/
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public static String getJsonString(Object obj) {
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ObjectMapper mapper = new ObjectMapper();
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try {
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return mapper.writeValueAsString(obj);
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} catch (Exception e) {
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e.printStackTrace();
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return "";
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}
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}
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/**
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*
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* @param <T>
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* @param jsonStr
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* @param T
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* @return
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*/
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public static <T> T readJsonEntity(String jsonStr, Class<T> T) {
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ObjectMapper mapper = new ObjectMapper();
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try {
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mapper.configure(Feature.ALLOW_SINGLE_QUOTES, true);
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return mapper.readValue(jsonStr, T);
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} catch (Exception e) {
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e.printStackTrace();
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return null;
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}
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}
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/**
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* JsonNode
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*
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* @param jsonStr
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* @see { 代码示例： String resultJson
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* ="{'playerResults':[{'playerId':'111','gameId':'','tee':'0,0,0'},{'playerId':'ff80808137f7daac0137f7dd1ab80001','gameId':'','tee':'255,255,255'}]}";
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* JsonNode jn=readJsonEntity(resultJson); jn=jn.get("playerResults");
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* for (int i = 0; i < jn.size(); i++){ String
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* playerId=jn.get(i).get("playerId").asText();
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* logger.info("playerId="+playerId); } }
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* @return
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*/
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public static JsonNode readJsonEntity(String jsonStr) {
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return readJsonEntity(jsonStr, JsonNode.class);
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}
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/**
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* 将POJO转换成JSON
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* @param object
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* @return
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* @throws Exception
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*/
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public static String bean2Json(Object object) {
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String json = null;
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ObjectMapper mapper = new ObjectMapper();
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try {
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json = mapper.writeValueAsString(object);
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} catch (Exception e) {
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e.printStackTrace();
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return null;
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}
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return json;
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}
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/**
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* 将JSON转换成POJO
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* @param <T>
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* @param json
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* @param beanClz POJO的Class
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* @return
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* @throws Exception
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*/
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public static <T> T json2Object(String json, Class<T> beanClz) {
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ObjectMapper mapper = new ObjectMapper();
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mapper.configure(Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
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mapper.configure(Feature.ALLOW_SINGLE_QUOTES, true);
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mapper.configure(Feature.ALLOW_SINGLE_QUOTES, true);
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mapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);
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T t = null;
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try {
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t = mapper.readValue(json, beanClz);
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} catch (Exception e) {
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try {t = beanClz.newInstance();} catch (Exception e1) {}
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e.printStackTrace();
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return null;
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}
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return t;
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}
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/**
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* json数组转List
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* @param jsonStr
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* @param valueTypeRef
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* @return
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*/
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public static <T> T readValue(String jsonStr, TypeReference<T> valueTypeRef) {
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ObjectMapper objectMapper = new ObjectMapper();
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try {
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return objectMapper.readValue(jsonStr, valueTypeRef);
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} catch (Exception e) {
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e.printStackTrace();
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}
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return null;
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}
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}
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