package org.springblade.jfpt.parcel.util;
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import java.beans.BeanInfo;
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import java.beans.Introspector;
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import java.beans.PropertyDescriptor;
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import java.lang.reflect.Method;
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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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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.databind.JavaType;
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import com.fasterxml.jackson.databind.ObjectMapper;
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public class JsonUtils {
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// 定义jackson对象
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private static final ObjectMapper MAPPER = new ObjectMapper();
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/**
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* 将对象转换成json字符串。
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* <p>Title: pojoToJson</p>
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* <p>Description: </p>
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* @param data
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* @return
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*/
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public static String objectToJson(Object data) {
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try {
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String string = MAPPER.writeValueAsString(data);
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return string;
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} catch (JsonProcessingException 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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* 将json结果集转化为对象
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*
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* @param jsonData json数据
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* @param beanType 对象中的object类型
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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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* 将json数据转换成pojo对象list
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* <p>Title: jsonToList</p>
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* <p>Description: </p>
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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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public static Map<String, Object> objectToMap(Object obj) throws Exception {
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if(obj == null)
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return null;
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Map<String, Object> map = new HashMap<String, Object>();
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BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
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PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
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for (PropertyDescriptor property : propertyDescriptors) {
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String key = property.getName();
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if (key.compareToIgnoreCase("class") == 0) {
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continue;
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}
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Method getter = property.getReadMethod();
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Object value = getter!=null ? getter.invoke(obj) : null;
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map.put(key, value);
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}
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return map;
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}
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}
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