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@@ -0,0 +1,313 @@
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+package com.example.demo.utils;
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+
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+import com.fasterxml.jackson.databind.JavaType;
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+import com.fasterxml.jackson.databind.ObjectMapper;
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+import com.google.gson.Gson;
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+import com.google.gson.GsonBuilder;
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+import com.google.gson.JsonElement;
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+import com.google.gson.JsonSyntaxException;
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+import com.google.gson.reflect.TypeToken;
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+import org.slf4j.Logger;
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+import org.slf4j.LoggerFactory;
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+
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+import java.lang.reflect.InvocationTargetException;
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+import java.lang.reflect.Method;
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+import java.lang.reflect.Modifier;
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+import java.lang.reflect.Type;
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+import java.util.ArrayList;
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+import java.util.HashMap;
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+import java.util.List;
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+import java.util.Map;
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+
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+
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+/**
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+ * json解析的工具类
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+ */
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+public class JsonUtils {
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+
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+ // 定义jackson对象
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+ private static final ObjectMapper MAPPER = new ObjectMapper();
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+ public static Logger log = LoggerFactory.getLogger(JsonUtils.class);
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+
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+ /**
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+ * 把对象转换为json数据
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+ *
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+ * @param obj
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+ * @return 2018年5月7日 下午5:27:16
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+ */
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+ public static String objectToJson(Object obj) {
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+ Gson gson = new GsonBuilder().setDateFormat("yyyy-MM-dd HH:mm:ss").create();
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+ try {
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+ String json = gson.toJson(obj);
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+ return json;
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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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+ /**
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+ * 将Object转换成Map
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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 Map<String, Object> objectToMap(Object obj) {
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+
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+ try {
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+ Gson gson = new GsonBuilder().setDateFormat("yyyy-MM-dd HH:mm:ss").create();
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+ String json = gson.toJson(obj);
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+ return jsonToMap(json);
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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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+ /**
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+ * 将Object类型的map转换成String类型
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+ *
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+ * @param map
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+ * @return
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+ */
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+ public static Map<String, String> mapToMap(Map<String, Object> map) {
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+ Map<String, String> returnMap = new HashMap<>();
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+ for (String key : map.keySet()) {
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+ returnMap.put(key, String.valueOf(map.get(key)));
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+ }
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+ return returnMap;
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+ }
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+
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+ /**
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+ * 任意类型转换成Map
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+ * @return
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+ */
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+ public static Map<String, String> object2Map(Object obj) {
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+ Map<String, String> hashMap = new HashMap();
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+ try {
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+ Class c = obj.getClass();
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+ Method m[] = c.getDeclaredMethods();
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+ for (int i = 0; i < m.length; i++) {
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+ if (m[i].getName().indexOf("get")==0) {
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+ // 得到Map的key
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+ String suffixKey = m[i].getName().substring(4);
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+ String prefixKey = m[i].getName().substring(3,4).toLowerCase();
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+ hashMap.put(prefixKey + suffixKey, String.valueOf(m[i].invoke(obj, new Object[0])));
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+ }
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+ }
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+ } catch (Throwable e) {
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+ log.error(e.getMessage());
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+ }
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+ return hashMap;
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+ }
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+
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+
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+ /**
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+ * 把json字符串转化为对象
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+ *
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+ * @param jsonString
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+ * @param clazz
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+ * @return
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+ */
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+ public static Object jsonToObject(String jsonString, Class<?> clazz) {
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+
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+ Gson gson = new GsonBuilder().setDateFormat("yyyy-MM-dd HH:mm:ss").create();
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+ Object obj = null;
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+ try {
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+ obj = gson.fromJson(jsonString, clazz);
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+ } catch (JsonSyntaxException e) {
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+ e.printStackTrace();
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+ }
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+ return obj;
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+ }
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+
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+ /**
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+ * josn转arrayList
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+ *
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+ * @param jsonArray
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+ * @return
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+ */
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+ public static ArrayList<?> jsonArrayToArrayList(String jsonArray) {
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+
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+ Gson gson = new GsonBuilder()
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+ .excludeFieldsWithModifiers(Modifier.FINAL, Modifier.TRANSIENT, Modifier.STATIC)
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+ .setDateFormat("yyyy-MM-dd HH:mm:ss")
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+ .serializeNulls()
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+ .create();
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+ ArrayList<?> list = null;
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+ try {
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+ Type listType = new TypeToken<ArrayList<?>>() {
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+ }.getType();
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+
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+ list = gson.fromJson(jsonArray, listType);
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+ } catch (JsonSyntaxException e) {
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+ e.printStackTrace();
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+ }
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+ return list;
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+ }
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+
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+ /**
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+ * JSON 转 ArrayList
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+ */
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+ public static ArrayList<?> jsonArrayToArrayList(String jsonArray, Class<?> clazz) {
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+
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+ Gson gson = new GsonBuilder()
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+ .excludeFieldsWithModifiers(Modifier.FINAL, Modifier.TRANSIENT, Modifier.STATIC)
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+ .setDateFormat("yyyy-MM-dd HH:mm:ss")
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+ .serializeNulls()
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+ .create();
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+ ArrayList<?> list = null;
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+ try {
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+
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+ list = (ArrayList<?>) gson.fromJson(jsonArray, clazz);
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+ } catch (JsonSyntaxException e) {
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+ e.printStackTrace();
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+ }
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+ return list;
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+ }
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+
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+ /**
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+ * 把json转换为map类型的数据
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+ *
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+ * @param json
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+ * @return
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+ */
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+ public static Map<String, Object> jsonToMap(String json) {
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+
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+ Gson gson = new GsonBuilder()
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+ .excludeFieldsWithModifiers(Modifier.FINAL, Modifier.TRANSIENT, Modifier.STATIC)
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+ .setDateFormat("yyyy-MM-dd HH:mm:ss")
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+ .serializeNulls()
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+ .create();
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+ Map<String, Object> map = null;
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+ try {
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+ Type type = new TypeToken<Map<String, Object>>() {
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+ }.getType();
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+
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+ map = gson.fromJson(json, type);
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+ } catch (JsonSyntaxException e) {
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+ e.printStackTrace();
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+ }
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+ return map;
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+ }
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+
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+ /**
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+ * 将Json转换成Map<String, ?>
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+ *
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+ * @param json
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+ * @param clazz
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+ * @return
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+ */
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+ public static Map<String, ?> jsonToMap(String json, Class<?> clazz) {
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+
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+ Gson gson = new GsonBuilder()
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+ .excludeFieldsWithModifiers(Modifier.FINAL, Modifier.TRANSIENT, Modifier.STATIC)
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+ .setDateFormat("yyyy-MM-dd HH:mm:ss")
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+ .serializeNulls()
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+ .create();
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+ Map<String, ?> map = null;
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+ try {
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+ Type type = new TypeToken<Map<String, ?>>() {
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+ }.getType();
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+
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+ map = gson.fromJson(json, type);
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+ } catch (JsonSyntaxException e) {
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+ e.printStackTrace();
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+ }
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+ return map;
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+ }
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+
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+ /**
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+ * 将map转换成pojo
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+ *
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+ * @param map
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+ * @param beanType
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+ * @param <T>
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+ * @return
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+ */
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+ public static <T> T mapToPojo(Map<String, Object> map, Class<T> beanType) {
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+
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+ Gson gson = new GsonBuilder()
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+ .excludeFieldsWithModifiers(Modifier.FINAL, Modifier.TRANSIENT, Modifier.STATIC)
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+ .setDateFormat("yyyy-MM-dd HH:mm:ss")
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+ .serializeNulls()
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+ .create();
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+
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+ JsonElement jsonElement = gson.toJsonTree(map);
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+ T pojo = gson.fromJson(jsonElement, beanType);
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+
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+ return pojo;
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+ }
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+
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+ /**
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+ * 将json结果集转化为对象
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+ *
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+ * @param jsonData
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+ * @param beanType
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+ * @param <T>
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+ * @return
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+ */
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+ public static <T> T jsonToPojo(String jsonData, Class<T> beanType) {
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+ try {
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+ T t = MAPPER.readValue(jsonData, beanType);
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+ return t;
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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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+ /**
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+ * 将json数据转换成pojo对象list
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+ *
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+ * @param jsonData
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+ * @param beanType
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+ * @return
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+ */
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+ public static <T> List<T> jsonToList(String jsonData, Class<T> beanType) {
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+ JavaType javaType = MAPPER.getTypeFactory().constructParametricType(List.class, beanType);
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+ try {
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+ List<T> list = MAPPER.readValue(jsonData, javaType);
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+ return list;
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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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+
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+ /**
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+ * 将任意pojo转化成map
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+ *
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+ * @param t pojo对象
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+ * @return
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+ */
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+ public static <T> Map<String, Object> pojoToMap(T t) {
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+ Map<String, Object> result = new HashMap<String, Object>();
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+ Method[] methods = t.getClass().getMethods();
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+ try {
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+ for (Method method : methods) {
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+ Class<?>[] paramClass = method.getParameterTypes();
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+ // 如果方法带参数,则跳过
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+ if (paramClass.length > 0) {
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+ continue;
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+ }
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+ String methodName = method.getName();
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+ if (methodName.startsWith("get")) {
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+ Object value = method.invoke(t);
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+ result.put(methodName, value);
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+ }
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+ }
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+ } catch (IllegalArgumentException e) {
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+ e.printStackTrace();
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+ } catch (IllegalAccessException e) {
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+ e.printStackTrace();
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+ } catch (InvocationTargetException e) {
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+ e.printStackTrace();
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+ } catch (SecurityException e) {
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+ e.printStackTrace();
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+ }
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+ return result;
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+ }
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+
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+}
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