提交HiveJDBCByDruid类
This commit is contained in:
RenKaiGe-Office
237
src/main/java/com/nis/util/HiveJDBCByDruid.java
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237
src/main/java/com/nis/util/HiveJDBCByDruid.java
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package com.nis.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.math.BigDecimal;
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import java.sql.Connection;
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import java.sql.ResultSet;
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import java.sql.ResultSetMetaData;
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import java.sql.SQLException;
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import java.sql.Statement;
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import java.util.ArrayList;
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import java.util.Date;
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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 org.apache.ibatis.mapping.ResultMap;
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import org.apache.ibatis.mapping.ResultMapping;
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import org.apache.ibatis.session.SqlSessionFactory;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import com.alibaba.druid.pool.DruidDataSource;
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import com.nis.domain.Page;
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import com.nis.web.service.SpringContextHolder;
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/**
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*
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* <p>Title: HiveJDBCByDruid</p>
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* <p>Description: 使用druid连接池对hive进行查询并解析结果</p>
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* <p>Company: IIE</p>
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* @author rkg
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* @date 2018年8月20日
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*
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*/
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public class HiveJDBCByDruid {
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private final static Logger logger = LoggerFactory.getLogger(HiveJDBCByDruid.class);
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static DruidDataSource datasource = null;
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Connection conn = null;
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ResultSet rs = null;
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Statement st = null;
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public static Connection getConnection() throws SQLException {
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if (datasource == null) {
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datasource = (DruidDataSource) SpringContextHolder.getBean("HiveDataSourceByDruid");
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}
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return datasource.getConnection();
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}
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/**
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* 将结果利用反射映射成对象集合
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*
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* @param rs
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* resultSet
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* @param entityClass
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* 实体类
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* @param obj
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* 那些字段需要转换为date类型(由于数据中心表结构中没有date类型数据,其日期用long型表示,界面中需要显示yyyy-MM-dd
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* hh:mm:ss形式,所以需要将long转换为date)
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* @return
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* @throws Exception
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*/
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public Map<String, List<Object>> tableMapping(Page<?> page, String redisKey, String sql, Class<?> entityClass, Object... obj)
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throws Exception {
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Map<String, List<Object>> mapList = new HashMap<String, List<Object>>();
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try {
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Map<String, String> filedAndColumnMap = getColumn2FiledMap(entityClass);
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List<Object> listString = new ArrayList<Object>();
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List<Object> listObject = new ArrayList<Object>();
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// 不从Object... obj中获取需要date类型的字段了,调用的时候容易漏写,改为反射获取date类型的字段
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List<String> columnList = getDateColumn(entityClass);
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conn = getConnection();
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logger.info("连接数据中心日志库成功--------------------------");
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st = conn.createStatement();
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rs = st.executeQuery(sql);
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logger.info("执行查询语句成功sql={}", sql);
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ResultSetMetaData metaData = rs.getMetaData();
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while (rs.next()) {
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Map<String,Object> map = new HashMap<String,Object>();
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for (int i = 1; i <= metaData.getColumnCount(); i++) {
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Object value = rs.getObject(i);
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String filedName = filedAndColumnMap.get(metaData.getColumnName(i).toString().toLowerCase());
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if (!StringUtil.isEmpty(value)) {
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// 如果是日期类型的属性需要把时间戳转换成日期，如果时间戳为0直接把值设置为null
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if (null != columnList && columnList.contains(filedName.toLowerCase())) {
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long time = 0l;
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time = Long.parseLong(value.toString());
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map.put(filedName, time == 0l ? null : new Date(time * 1000));
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// map.put(filedName, new
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// Date(Long.parseLong("1476583810000")));
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} else {
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map.put(filedName, value);
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}
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} else {
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map.put(filedName, null);
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}
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}
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listString.add(JsonMapper.toJsonString(map2Obj(map, entityClass)));
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listObject.add(map2Obj(map, entityClass));
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}
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logger.info("开始关闭数据中心连接");
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HiveDataSource.closeConn();
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if (null == listString || listString.size() == 0 || null == listObject || listObject.size() == 0) {
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return null;
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} else {
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//暂时没有往缓存写的操作
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// if (Constants.IS_OPEN_REDIS && Constants.DATACENTER_OPEN_REDIS) {
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// new SaveRedisListThread(redisKey, listString, Constants.HIVE_EXPIRE).start();
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// }
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}
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// sublist包前不包后,0-30实际获取的是0-29的数据
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Integer startNum = (page.getPageNo() - 1) * page.getPageSize();
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Integer endNum = startNum - 1 + page.getPageSize() + 1;
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if (listString.size() >= startNum) {
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if (listString.size() >= endNum) {
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mapList.put("str", listString.subList(startNum, endNum));
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} else {
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mapList.put("str", listString.subList(startNum, listString.size()));
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}
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} else {
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mapList.put("str", new ArrayList<Object>());
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}
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if (listObject.size() >= startNum) {
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if (listObject.size() >= endNum) {
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mapList.put("obj", listObject.subList(startNum, endNum));
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} else {
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mapList.put("obj", listObject.subList(startNum, listObject.size()));
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}
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} else {
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mapList.put("obj", new ArrayList<Object>());
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}
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} finally {
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closeConn();
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}
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return mapList;
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}
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public void closeConn() {
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try {
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if (rs != null) {
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rs.close();
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rs = null;
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}
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if (st != null) {
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st.close();
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st = null;
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}
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if (conn != null) {
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conn.close();
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conn = null;
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}
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logger.info("关闭数据中心连接成功");
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} catch (Exception e) {
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e.printStackTrace();
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logger.error("关闭数据中心连接失败,失败原因" + e);
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}
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}
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/**
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* 反射获取类中date类型的字段名称
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* @param type
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* @return
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* @throws Exception
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*/
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public static List<String> getDateColumn(Class<?> type) throws Exception {
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List<String> columnList = new ArrayList<String>();
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BeanInfo beanInfo = Introspector.getBeanInfo(type);
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PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
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for (int i = 0; i < propertyDescriptors.length; i++) {
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PropertyDescriptor propertyDescriptor = propertyDescriptors[i];
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String name = propertyDescriptor.getName();
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String fieldTypeName = propertyDescriptor.getPropertyType().getName();
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if (fieldTypeName.equals("java.util.Date")) {
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columnList.add(name.toLowerCase());
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}
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}
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return columnList;
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}
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public static Object map2Obj(Map<String, Object> map, Class<?> beanClass) throws Exception {
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BeanInfo beanInfo = Introspector.getBeanInfo(beanClass);
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Object obj = beanClass.newInstance();
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PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
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for (int i = 0; i < propertyDescriptors.length; i++) {
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PropertyDescriptor propertyDescriptor = propertyDescriptors[i];
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String name = propertyDescriptor.getName();
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String fieldTypeName = propertyDescriptor.getPropertyType().getName();
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if (map.containsKey(name)) {
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Object value = map.get(name);
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if (!StringUtil.isEmpty(value)) {
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if (fieldTypeName.equals("java.lang.String")) {
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propertyDescriptor.getWriteMethod().invoke(obj, value.toString());
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} else if (fieldTypeName.equals("java.lang.Integer")) {
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propertyDescriptor.getWriteMethod().invoke(obj, Integer.parseInt(value.toString()));
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} else if (fieldTypeName.equals("java.lang.Long")) {
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propertyDescriptor.getWriteMethod().invoke(obj, Long.parseLong(value.toString()));
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} else if (fieldTypeName.equals("java.lang.Boolean")) {
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propertyDescriptor.getWriteMethod().invoke(obj, Boolean.parseBoolean(value.toString()));
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} else if (fieldTypeName.equals("java.lang.Character")) {
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propertyDescriptor.getWriteMethod().invoke(obj, value.toString().toCharArray());
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} else if (fieldTypeName.equals("java.lang.Byte")) {
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propertyDescriptor.getWriteMethod().invoke(obj, value.toString().getBytes());
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} else if (fieldTypeName.equals("java.lang.Short")) {
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propertyDescriptor.getWriteMethod().invoke(obj, Short.parseShort(value.toString()));
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} else if (fieldTypeName.equals("java.lang.Float")) {
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propertyDescriptor.getWriteMethod().invoke(obj, Float.parseFloat(value.toString()));
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} else if (fieldTypeName.equals("java.lang.Double")) {
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propertyDescriptor.getWriteMethod().invoke(obj, Double.parseDouble(value.toString()));
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} else if (fieldTypeName.equals("java.math.BigDecimal")) {
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propertyDescriptor.getWriteMethod().invoke(obj,
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BigDecimal.valueOf(Long.parseLong(value.toString())));
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} else if (fieldTypeName.equals("java.util.Date")) {
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propertyDescriptor.getWriteMethod().invoke(obj, (Date) value);
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}
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}
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}
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}
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return obj;
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}
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public static Map<String, String> getColumn2FiledMap(Class<?> clazz) {
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Map<String, String> map = new HashMap<String, String>();
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SqlSessionFactory sqlSessionFactory = SpringContextHolder.getBean(SqlSessionFactory.class);
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ResultMap resultMap = sqlSessionFactory.getConfiguration().getResultMap(clazz.getSimpleName() + "Map");
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List<ResultMapping> mapping = resultMap.getResultMappings();
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for (ResultMapping mapp : mapping) {
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map.put(mapp.getColumn().toLowerCase(), mapp.getProperty());
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}
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return map;
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}
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}
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