使用POI导出数据到excel代码

POM文件

<!-- 导出excel -->
<dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>3.14</version>
</dependency><dependency><groupId>com.google.guava</groupId><artifactId>guava</artifactId><version>23.0</version>
</dependency>

工具类

ExcelExportUtil

package cn.zhen.excel.util;import com.google.common.base.Strings;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.ss.util.CellRangeAddress;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.math.BigDecimal;
import java.util.List;
import java.util.Map;public class ExcelExportUtil {//表头private String title;//各个列的表头private String[] heardList;//各个列的元素key值private String[] heardKey;//需要填充的数据信息private List<Map> data;//字体大小private int fontSize = 14;//行高private int rowHeight = 30;//列宽private int columWidth = 200;//工作表private String sheetName = "sheet1";public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public String[] getHeardList() {return heardList;}public void setHeardList(String[] heardList) {this.heardList = heardList;}public String[] getHeardKey() {return heardKey;}public void setHeardKey(String[] heardKey) {this.heardKey = heardKey;}public List<Map> getData() {return data;}public void setData(List<Map> data) {this.data = data;}public int getFontSize() {return fontSize;}public void setFontSize(int fontSize) {this.fontSize = fontSize;}public int getRowHeight() {return rowHeight;}public void setRowHeight(int rowHeight) {this.rowHeight = rowHeight;}public int getColumWidth() {return columWidth;}public void setColumWidth(int columWidth) {this.columWidth = columWidth;}public String getSheetName() {return sheetName;}public void setSheetName(String sheetName) {this.sheetName = sheetName;}/*** 开始导出数据信息**/public byte[] exportExport(HttpServletRequest request, HttpServletResponse response) throws IOException {//检查参数配置信息checkConfig();//创建工作簿HSSFWorkbook wb = new HSSFWorkbook();//创建工作表HSSFSheet wbSheet = wb.createSheet(this.sheetName);//设置默认行宽wbSheet.setDefaultColumnWidth(20);// 标题样式（加粗，垂直居中）HSSFCellStyle cellStyle = wb.createCellStyle();cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);//水平居中//TODO cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);//垂直居中HSSFFont fontStyle = wb.createFont();fontStyle.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);fontStyle.setBold(true);   //加粗fontStyle.setFontHeightInPoints((short)16);  //设置标题字体大小cellStyle.setFont(fontStyle);//在第0行创建rows  (表标题)HSSFRow title = wbSheet.createRow((int) 0);title.setHeightInPoints(30);//行高HSSFCell cellValue = title.createCell(0);cellValue.setCellValue(this.title);cellValue.setCellStyle(cellStyle);wbSheet.addMergedRegion(new CellRangeAddress(0,0,0,(this.heardList.length-1)));//设置表头样式，表头居中HSSFCellStyle style = wb.createCellStyle();//设置单元格样式style.setAlignment(HSSFCellStyle.ALIGN_CENTER);style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);//设置字体HSSFFont font = wb.createFont();font.setFontHeightInPoints((short) this.fontSize);style.setFont(font);//在第1行创建rowsHSSFRow row = wbSheet.createRow((int) 1);//设置列头元素HSSFCell cellHead = null;for (int i = 0; i < heardList.length; i++) {cellHead = row.createCell(i);cellHead.setCellValue(heardList[i]);cellHead.setCellStyle(style);}//设置每格数据的样式 （字体红色）HSSFCellStyle cellParamStyle = wb.createCellStyle();HSSFFont ParamFontStyle = wb.createFont();cellParamStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);cellParamStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);ParamFontStyle.setColor(HSSFColor.DARK_RED.index);   //设置字体颜色 (红色)ParamFontStyle.setFontHeightInPoints((short) this.fontSize);cellParamStyle.setFont(ParamFontStyle);//设置每格数据的样式2（字体蓝色）HSSFCellStyle cellParamStyle2 = wb.createCellStyle();cellParamStyle2.setAlignment(HSSFCellStyle.ALIGN_CENTER);cellParamStyle2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);HSSFFont ParamFontStyle2 = wb.createFont();ParamFontStyle2.setColor(HSSFColor.BLUE.index);   //设置字体颜色 (蓝色)ParamFontStyle2.setFontHeightInPoints((short) this.fontSize);cellParamStyle2.setFont(ParamFontStyle2);//开始写入实体数据信息int a = 2;for (int i = 0; i < data.size(); i++) {HSSFRow roww = wbSheet.createRow((int) a);Map map = data.get(i);HSSFCell cell = null;for (int j = 0; j < heardKey.length; j++) {cell = roww.createCell(j);cell.setCellStyle(style);Object valueObject = map.get(heardKey[j]);String value = null;if (valueObject == null) {valueObject = "";}if (valueObject instanceof String) {//取出的数据是字符串直接赋值value = (String) map.get(heardKey[j]);} else if (valueObject instanceof Integer) {//取出的数据是Integervalue = String.valueOf(((Integer) (valueObject)).floatValue());} else if (valueObject instanceof BigDecimal) {//取出的数据是BigDecimalvalue = String.valueOf(((BigDecimal) (valueObject)).floatValue());} else {value = valueObject.toString();}//设置单个单元格的字体颜色if(heardKey[j].equals("ddNum") || heardKey[j].equals("sjNum")){if((Long)map.get("ddNum")!=null){if((Long)map.get("sjNum")==null){cell.setCellStyle(cellParamStyle);} else if((Long) map.get("ddNum") != (Long) map.get("sjNum")){if ((Long) map.get("ddNum") > (Long) map.get("sjNum")) {cell.setCellStyle(cellParamStyle);}if ((Long) map.get("ddNum") < (Long) map.get("sjNum")) {cell.setCellStyle(cellParamStyle2);}}else {cell.setCellStyle(style);}}}cell.setCellValue(Strings.isNullOrEmpty(value) ? "" : value);}a++;}//导出数据try {//设置Http响应头告诉浏览器下载这个附件response.setHeader("Content-Disposition", "attachment;Filename=" + System.currentTimeMillis() + ".xls");OutputStream outputStream = response.getOutputStream();wb.write(outputStream);outputStream.close();return wb.getBytes();} catch (Exception ex) {ex.printStackTrace();throw new IOException("导出Excel出现严重异常，异常信息：" + ex.getMessage());}}/*** 检查数据配置问题** @throws IOException 抛出数据异常类*/protected void checkConfig() throws IOException {if (heardKey == null || heardList.length == 0) {throw new IOException("列名数组不能为空或者为NULL");}if (fontSize < 0 || rowHeight < 0 || columWidth < 0) {throw new IOException("字体、宽度或者高度不能为负值");}if (Strings.isNullOrEmpty(sheetName)) {throw new IOException("工作表表名不能为NULL");}}
}

server层

ExcelExportServiceImpl

 @Overridepublic void queryProjectInfoBySchemeId(HttpServletResponse response,                                        HttpServletRequest request, String schemeId,                                              String pushDate) throws IOException {//数据List<Map> maps = new ArrayList<>();   Map<String,String> map1 = new HashMap();map1.put("city","振式集团");map1.put("projectName","振振爱御姐");map1.put("ddNum","100w");map1.put("sjNum","99w");Map<String,String> map2 = new HashMap();map1.put("city","振式集团子公司");map1.put("projectName","振振爱萝莉");map1.put("ddNum","100w");map1.put("sjNum","99w");maps.add(map1);maps.add(map2);if(maps!=null && maps.size()>0){//表头String companyName = "公司项目汇总";String sheetTitle = companyName;//数据描述String [] title = new String[]{"城市","项目名字","合同","实际"};    // 查询对应的字段String [] properties = new String[]{"city","projectName","ddNum","sjNum"};                ExcelExportUtil excelExport2 = new ExcelExportUtil();excelExport2.setData(maps);excelExport2.setHeardKey(properties);excelExport2.setFontSize(14);excelExport2.setSheetName(sheetTitle);excelExport2.setTitle(sheetTitle);excelExport2.setHeardList(title);excelExport2.exportExport(request, response);}

Contorller层

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使用POI导出数据到excel代码

使用POI导出数据到excel代码

POM文件

工具类

server层

Contorller层

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