java 导出excel实例(内含通用excel导出工具类)
1.创建一个ExportPropertiesDto，用于动态导出表头（前端传过来的json数组类似：[{"field":"year","fieldName":"年份"},{"field":"departmentName","fieldName":"部门"},{"field":"typeName","fieldName":"类型名"}]）
import java.io.Serializable;
public class ExportPropertiesDto implements Serializable{
private static final long serialVersionUID = 1L;
private String field;
private String fieldName;
public ExportPropertiesDto() {
super();
}
public ExportPropertiesDto(String field, String fieldName) {
super();
this.field = field;
this.fieldName = fieldName;
}
public String getField() {
return field;
}
public void setField(String field) {
this.field = field;
}
public String getFieldName() {
return fieldName;
}
public void setFieldName(String fieldName) {
this.fieldName = fieldName;
}
}
2.整一个ExportExcelUtil工具类
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import java.io.IOException;
import java.util.List;
public final class ExportExcelUtil {
private static final int HEADER_WIDTH = 20 * 256;
private static final int COLUMN_WIDTH = 30 * 256;
private static final int COLUMN_INDEX1 = 2;
private static final int COLUMN_INDEX2 = 7;
private static final int ROW_NUMBER = 0;
private static final int FONT_HEIGHT1 = 10;
private static final int FONT_HEIGHT2 = 12;
private ExportExcelUtil() {
}
public static void writeExcel(HSSFWorkbook wb,HSSFSheet sheet, String[] headers, List list)
throws IOException {
for (int i = 0; i < headers.length; i++) {
sheet.setColumnWidth(i, HEADER_WIDTH);
}
sheet.setColumnWidth(COLUMN_INDEX1, COLUMN_WIDTH);
sheet.setColumnWidth(COLUMN_INDEX2, COLUMN_WIDTH);
HSSFRow row = sheet.createRow(ROW_NUMBER);
HSSFFont font = wb.createFont();
font.setFontName("Arial");
font.setFontHeightInPoints((short) FONT_HEIGHT1);
HSSFFont font2 = wb.createFont();
font2.setFontName("Arial");
font2.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
font2.setFontHeightInPoints((short) FONT_HEIGHT2);
HSSFCellStyle headerStyle = baseStyle(wb);
HSSFCellStyle borderStyle = baseStyle(wb);
headerStyle.setFont(font2);
borderStyle.setFont(font);
HSSFCell cell;
for (int i = 0; i < headers.length; i++) {
cell = row.createCell(i);
cell.setCellValue(headers[i]);
cell.setCellStyle(headerStyle);
}
for (int i = 0; i < list.size(); i++) {
row = sheet.createRow(i + 1);
String[] obs = list.get(i);
HSSFCell cellJ;
for (int j = 0; j < obs.length; j++) {
cellJ = row.createCell(j);
cellJ.setCellValue(obs[j]);
cellJ.setCellType(HSSFCell.CELL_TYPE_STRING);
cellJ.setCellStyle(borderStyle);
}
}
// wb.write(os);
// os.flush();
// os.close();
}
private static HSSFCellStyle baseStyle(HSSFWorkbook wb) {
HSSFCellStyle style = wb.createCellStyle();
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
style.setBorderTop(HSSFCellStyle.BORDER_THIN);
style.setBorderRight(HSSFCellStyle.BORDER_THIN);
style.setWrapText(true);
return style;
}
} 3.BudgetListRequestDto
增加搜索条件Dto，可以按照搜索条件导出
import java.io.Serializable;
import java.util.List;
import lombok.Getter;
import lombok.Setter;
@Getter
@Setter
public class BudgetListRequestDto implements Serializable{
private static final long serialVersionUID = 1L;
private String staffId;
private Integer id;
private String year;//年份
private Integer departmentId;//部门id
private Integer typeId;//预算类型
private String typeName;
private String description;
private List departmentIds;
private List typeIds;
private int pageNum;
private int pageSize;
public BudgetListRequestDto() {
}
public BudgetListRequestDto(String staffId, Integer id, String year, Integer departmentId, Integer typeId,
String typeName, String description, List departmentIds) {
this.staffId = staffId;
this.id = id;
this.year = year;
this.departmentId = departmentId;
this.typeId = typeId;
this.typeName = typeName;
this.description = description;
this.departmentIds = departmentIds;
}
} 4.ExcelExportContoller
@RequestMapping(value = "/exportExcel", method = RequestMethod.POST)
@ApiOperation(value = "导出Excel")
public ResultDto exportExcel(@RequestParam(required = true) String listProperties, @RequestParam(required=false) String queryCondition, HttpServletResponse response) {
try {
JSONArray data = JSONArray.fromObject(listProperties);
List properties = JSONArray.toList(data, ExportPropertiesDto.class);
BudgetListRequestDto request = null;
if(null!=queryCondition){
request = (BudgetListRequestDto) JSONObject.toBean(JSONObject.fromObject(queryCondition), BudgetListRequestDto.class);
}
Integer size = properties.size();
String[] header = new String[size];
if (null != properties && !properties.isEmpty()) {
int index = 0;
for (ExportPropertiesDto epd : properties) {
header[index] = epd.getFieldName();
index++;
}
}
StringBuilder excelName = new StringBuilder("导出excel案例");
excelName.append(".xls");
response.reset();
response.setHeader("Content-Disposition", "attachment;filename=" + new String(excelName.toString().getBytes("GB2312"), "ISO8859-1"));
// 设定输出文件头
response.setContentType("application/msexcel");
// sheet名称
String sheetName = "detail";
OutputStream output = response.getOutputStream();
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet(sheetName);
//锁定第一行
sheet.createFreezePane(0,1,0,1);
List list = excelService.exportExcel(request.getYear(), request.getDepartmentIds(), request.getTypeIds(), properties);
//调用导出工具类
ExportExcelUtil.writeExcel(wb, sheet, header, list);
wb.write(output);
output.flush();
output.close();
return ResultDtoFactory.toAck("success");
} catch (Exception e) {
log.error("excel导出" + e);
return ResultDtoFactory.toNack("excel导出失败");
}
} 5.ExcelService接口
public interface ExcelService{
List exportExcel(String year, List departmentIds,
List typeIds, List properties) throws
ParseException,NoSuchMethodException,IllegalAccessException,
InvocationTargetException;
} 7.ExcelService的实现类ExcelServiceImpl
public class ExcelServiceImpl implements ExcelService {
@Autowired
ExcelMapper excelMapper;
/**
* 导出excel
*/
@Override
public List exportExcel(String year, List departmentIds, List typeIds, List properties) throws ParseException,
NoSuchMethodException, IllegalAccessException, InvocationTargetException {
List totalList = new ArrayList();
//把查询条件赋值到requestDto中
BudgetListRequestDto budgetListRequestDto = new BudgetListRequestDto();
budgetListRequestDto.setYear(year);
budgetListRequestDto.setDepartmentIds(departmentIds);
budgetListRequestDto.setTypeIds(typeIds);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
//导出合计sheet，根据具体业务查询具体数据
List totals = excelMapper.getBudget(budgetListRequestDto);
for (BudgetDetailDto total : totals) {
List temp = new ArrayList<>();
for (ExportPropertiesDto epd : properties) {
//通过反射获取和动态表头对应的字段的值
Method m = null;
//通过类对象获取对应表头字段的get方法
m = total.getClass().getMethod("get" + epd.getField().substring(0, 1).toUpperCase() + epd.getField().substring(1));
if ("null".equals(String.valueOf(m.invoke(total)))) {
temp.add("");
} else {
//对Date类型的字段进行处理
if ("导入时间".equals(epd.getFieldName())) {
temp.add(sdf.format(m.invoke(total)));
} else if ("预算内金额".equals(epd.getFieldName()) || "预算内已用金额".equals(epd.getFieldName()) || "预算内调整".equals(epd.getFieldName())) {
//利用DecimalFormat来处理导出后长数字显示为科学计数问题
temp.add(new DecimalFormat("0.00").format(m.invoke(total)));
} else {
temp.add(String.valueOf(m.invoke(total)));
}
}
}
//添加一行数据到list中去，数组的大小就是动态表头的长度
totalList.add(temp.toArray(new String[properties.size()]));
}
//移除合计时无需累加的行
for (int i = 0; i < totals.size(); i++) {
if ("人工费用".equals(totals.get(i).getTypeName()) || "日常费用".equals(totals.get(i).getTypeName()) || "平台费用".equals(totals.get(i).getTypeName())
|| "专项费用".equals(totals.get(i).getTypeName()) || "付现费用总计".equals(totals.get(i).getTypeName())) {
totals.remove(i);
}
}
//追加一行汇总行
Map map = new HashMap();
Double budgetaryAmount = 0.0;
Double budgetary = 0.0;
Double adjustment = 0.0;
Double budgetaryBtotal = 0.0;
Double extraBudgetary = 0.0;
Double extraBudgetaryUsed = 0.0;
Double budgetBalance = 0.0;
Double budgetaryTotal = 0.0;
//对需要合计的列进行累加
for (BudgetDetailDto budgetDetailDto : totals) {
budgetaryAmount = budgetDetailDto.getBudgetaryAmount() + budgetaryAmount;
map.put("budgetaryAmount", new DecimalFormat("0.00").format(budgetaryAmount));
budgetary = budgetDetailDto.getBudgetary() + budgetary;
map.put("budgetary", new DecimalFormat("0.00").format(budgetary));
adjustment = budgetDetailDto.getAdjustment() + adjustment;
map.put("adjustment", new DecimalFormat("0.00").format(adjustment));
budgetaryBtotal = budgetDetailDto.getBudgetaryBtotal() + budgetaryBtotal;
map.put("budgetaryBtotal", new DecimalFormat("0.00").format(budgetaryBtotal));
extraBudgetary = budgetDetailDto.getExtraBudgetary() + extraBudgetary;
map.put("extraBudgetary", new DecimalFormat("0.00").format(extraBudgetary));
extraBudgetaryUsed = budgetDetailDto.getExtraBudgetaryUsed() + extraBudgetaryUsed;
map.put("extraBudgetaryUsed", new DecimalFormat("0.00").format(extraBudgetaryUsed));
budgetBalance = budgetDetailDto.getBudgetBalance() + budgetBalance;
map.put("budgetBalance", new DecimalFormat("0.00").format(budgetBalance));
budgetaryTotal = budgetDetailDto.getBudgetaryTotal() + budgetaryTotal;
map.put("budgetaryTotal", new DecimalFormat("0.00").format(budgetaryTotal));
}
List temp1 = new ArrayList<>();
for (int j = 0; j < properties.size(); j++) {
ExportPropertiesDto exportPropertiesDtoTemp = properties.get(j);
String prop = exportPropertiesDtoTemp.getFieldName();
switch (prop) {
case "预算年份":
temp1.add("");
break;
case "部门":
temp1.add("");
break;
case "导入时间":
temp1.add("");
break;
case "预算类型":
temp1.add("合计");
break;
case "预算内金额":
temp1.add(map.get("budgetaryAmount"));
break;
case "预算内已用金额":
temp1.add(map.get("budgetary"));
break;
default:
break;
}
}
//追加一行合计
totalList.add(temp1.toArray(new String[properties.size()]));
return totalList;
}