Java：表单生成excel文档 poi 通用

在用java 写数据库应用的时候, 通常会生成各种报表，而这些报表可能会被导出为各种格式的文件，比如Excel文档，pdf 文档等等. 今天先做了一个生成Excel 文档的例子，主要解决以下问题：

1. 生成 Excel 文档.

2. 自动对生成的Excel 文档第一行标题栏设置成filter 过滤形式, 方便用户使用.

导入依赖：

<!--依赖的jar包-->
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.9</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.9</version>
</dependency>

Excel转换通用类：

package com.kingbal.king.dmp;

import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

/**
 * <b>Function: </b> todo
 *
 * @program: ExcelUtil
 * @Package: com.kingbal.king.dmp
 * @author: dingcho
 * @date: 2023/12/30
 * @version: 1.0
 * @Copyright: 2023 www.kingbal.com Inc. All rights reserved.
 */
public class ExcelUtil<T> {

	public HSSFCellStyle getCellStyle(HSSFWorkbook workbook, boolean isHeader) {
		HSSFCellStyle style = workbook.createCellStyle();
		style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
		style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
		style.setBorderRight(HSSFCellStyle.BORDER_THIN);
		style.setBorderTop(HSSFCellStyle.BORDER_THIN);
		style.setLocked(true);
		if (isHeader) {
			style.setFillForegroundColor(HSSFColor.GREY_25_PERCENT.index);
			style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
			HSSFFont font = workbook.createFont();
			font.setColor(HSSFColor.BLACK.index);
			font.setFontHeightInPoints((short) 12);
			font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
			style.setFont(font);
		}
		return style;
	}


	public void generateHeader(HSSFWorkbook workbook, HSSFSheet sheet, String[] headerColumns) {
		HSSFCellStyle style = getCellStyle(workbook, true);
		Row row = sheet.createRow(0);
		row.setHeightInPoints(30);
		for (int i = 0; i < headerColumns.length; i++) {
			Cell cell = row.createCell(i);
			String[] column = headerColumns[i].split("_#_");
			sheet.setColumnWidth(i, Integer.valueOf(column[1]));
			cell.setCellValue(column[0]);
			cell.setCellStyle(style);
		}
	}

	@SuppressWarnings({"rawtypes", "unchecked"})
	public HSSFSheet creatAuditSheet(HSSFWorkbook workbook, String sheetName,
									 List<T> dataset, String[] headerColumns, String[] fieldColumns)
			throws NoSuchMethodException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
		HSSFSheet sheet = workbook.createSheet(sheetName);
		sheet.protectSheet("");
		generateHeader(workbook, sheet, headerColumns);
		HSSFCellStyle style = getCellStyle(workbook, false);
		SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd");
		int rowNum = 0;
		for (T t : dataset) {
			rowNum++;
			Row row = sheet.createRow(rowNum);
			row.setHeightInPoints(25);
			for (int i = 0; i < fieldColumns.length; i++) {
				String fieldName = fieldColumns[i];

				String getMethodName = "get" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);
				try {
					Class clazz = t.getClass();
					Method getMethod;
					getMethod = clazz.getMethod(getMethodName, new Class[]{});
					Object value = getMethod.invoke(t, new Object[]{});
					String cellValue = "";
					// 对于某些特定类型进行转换
					if (value instanceof Date) {
						Date date = (Date) value;
						cellValue = sd.format(date);
					} else {
						cellValue = null != value ? value.toString() : "";
					}
					Cell cell = row.createCell(i);
					cell.setCellStyle(style);
					cell.setCellValue(cellValue);

				} catch (Exception e) {

				}
			}
		}
		return sheet;
	}

}

根据需求调用：

public static void main(String[] args) {
		Map<String, Object> param = Maps.newHashMap();
		param.put( "callType", "CALL_IN" );
		// 获取您对应查询的字段
		List<Cdr> cdrList = cdrService.queryListByParam(param);
		String [] cdrInColumns = new String[]{
				"呼入时间_#_3000" ,
				"挂断时间_#_3000" ,
				"座席工号_#_3000" ,
				"座席姓名_#_3000" ,
				"呼入时长（秒）_#_3000" ,
				"IVR时长（秒）_#_3000" ,
				"排队时长（秒）_#_3000" ,
				"通话时长（秒）_#_3000" ,
				"归属地_#_3000" ,
				"满意度调查_#_3000"
		};
		String [] cdrInFields = new String []{
				"callTime","hangupTime" ,"src" ,"workNo" ,"trueName" ,"totalLength" ,"ivrLength" ,
				"queueLength","datlLength" ,"city" ,"ivrKey"
		};
		HSSFWorkbook workbook = new HSSFWorkbook();
		ExcelUtil<Cdr> cdrSheet = new ExcelUtil<Cdr>();

		cdrSheet.creatAuditSheet(workbook, "呼出信息" , cdrList, cdrInColumns, cdrInFields);
		ByteArrayOutputStream os = new ByteArrayOutputStream();
		workbook.write(os);
		InputStream inputStream = new ByteArrayInputStream(os.toByteArray());
		// 获取文件长度 inputStream.available()
	}
}