使用 POI 将 JDBC 的 ResultSet 导入到 Excel 文件中的方法

POI 的 Maven 依赖：

<!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
			<dependency>
				<groupId>org.apache.poi</groupId>
				<artifactId>poi</artifactId>
				<version>3.17</version>
			</dependency>

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代码：

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import java.io.FileOutputStream;
import java.sql.ResultSet;

/**
 * Author:  htd
 * Date:    2018/3/15
 * Desc:    将 Hive 查询返回的 ResultSet 输出到 Excel 中
 */
public class ResultSetOutputExcelUtil {
    public static void toExcel(ResultSet rs, String outName) throws Exception {
        HSSFWorkbook wb = new HSSFWorkbook();
        HSSFSheet sheet = wb.createSheet("sheet");
        HSSFRow row = sheet.createRow(0);
        HSSFCell cell;
        for (int j = 0; j < rs.getMetaData().getColumnCount(); ++j) {
            String colName = rs.getMetaData().getColumnLabel(j + 1);
            cell = row.createCell(j);
            cell.setCellValue(colName);
        }
        int i = 0;
        while (rs.next()) {
            row = sheet.createRow(i + 1);
            for (int j = 0; j < rs.getMetaData().getColumnCount(); ++j) {
                String c = rs.getString(j + 1);
                row.createCell(j).setCellValue(c);
            }
            ++i;
        }
        FileOutputStream foStream = new FileOutputStream(outName);
        wb.write(foStream);
        foStream.flush();
        foStream.close();

    }
}

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输入参数为： ResultSet 和 输出文件的名称（包括路径）

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3、Exporting Resultset from Java database to Excel using Apache Poi
https://stackoverflow.com/questions/24933868/exporting-resultset-from-java-database-to-excel-using-apache-poi

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