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若依 2.1

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RuoYi
2018-07-09 08:44:52 +08:00
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commit 57773e6eff
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src/main/java/com/ruoyi/common/utils/poi/ExcelUtil.java Normal file
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package com.ruoyi.common.utils.poi;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import org.apache.poi.hssf.usermodel.DVConstraint;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFDataValidation;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRow;
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.CellStyle;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;
import org.apache.poi.ss.util.CellRangeAddressList;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.ResourceUtils;
import com.ruoyi.framework.aspectj.lang.annotation.Excel;
import com.ruoyi.framework.shiro.web.session.OnlineWebSessionManager;
import com.ruoyi.framework.web.domain.AjaxResult;
/**
* Excel相关处理
*
* @author ruoyi
*/
public class ExcelUtil<T>
{
private static final Logger log = LoggerFactory.getLogger(OnlineWebSessionManager.class);
public Class<T> clazz;
public ExcelUtil(Class<T> clazz)
{
this.clazz = clazz;
}
public List<T> importExcel(String sheetName, InputStream input) throws Exception
{
List<T> list = new ArrayList<T>();
Workbook workbook = WorkbookFactory.create(input);
Sheet sheet = workbook.getSheet(sheetName);
if (!sheetName.trim().equals(""))
{
sheet = workbook.getSheet(sheetName); // 如果指定sheet名,则取指定sheet中的内容.
}
if (sheet == null)
{
sheet = workbook.getSheetAt(0); // 如果传入的sheet名不存在则默认指向第1个sheet.
}
int rows = sheet.getPhysicalNumberOfRows();
if (rows > 0)
{
// 有数据时才处理
Field[] allFields = clazz.getDeclaredFields(); // 得到类的所有field.
Map<Integer, Field> fieldsMap = new HashMap<Integer, Field>(); // 定义一个map用于存放列的序号和field.
for (Field field : allFields)
{
// 将有注解的field存放到map中.
if (field.isAnnotationPresent(Excel.class))
{
Excel attr = field.getAnnotation(Excel.class);
int col = getExcelCol(attr.column());// 获得列号
field.setAccessible(true);// 设置类的私有字段属性可访问.
fieldsMap.put(col, field);
}
}
for (int i = 1; i < rows; i++)
{
// 从第2行开始取数据,默认第一行是表头.
Row row = sheet.getRow(i);
int cellNum = sheet.getRow(0).getPhysicalNumberOfCells();
T entity = null;
for (int j = 0; j < cellNum; j++)
{
Cell cell = row.getCell(j);
if (cell == null)
{
continue;
}
else
{
// 先设置Cell的类型，然后就可以把纯数字作为String类型读进来了 by zhuyangyong 20171228
row.getCell(j).setCellType(Cell.CELL_TYPE_STRING);
cell = row.getCell(j);
}
String c = cell.getStringCellValue();
if (c.equals(""))
{
continue;
}
entity = (entity == null ? clazz.newInstance() : entity);// 如果不存在实例则新建.
Field field = fieldsMap.get(j);// 从map中得到对应列的field.
// 取得类型,并根据对象类型设置值.
Class<?> fieldType = field.getType();
if (String.class == fieldType)
{
field.set(entity, String.valueOf(c));
}
else if ((Integer.TYPE == fieldType) || (Integer.class == fieldType))
{
field.set(entity, Integer.parseInt(c));
}
else if ((Long.TYPE == fieldType) || (Long.class == fieldType))
{
field.set(entity, Long.valueOf(c));
}
else if ((Float.TYPE == fieldType) || (Float.class == fieldType))
{
field.set(entity, Float.valueOf(c));
}
else if ((Short.TYPE == fieldType) || (Short.class == fieldType))
{
field.set(entity, Short.valueOf(c));
}
else if ((Double.TYPE == fieldType) || (Double.class == fieldType))
{
field.set(entity, Double.valueOf(c));
}
else if (Character.TYPE == fieldType)
{
if ((c != null) && (c.length() > 0))
{
field.set(entity, Character.valueOf(c.charAt(0)));
}
}
else if (java.util.Date.class == fieldType)
{
if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC)
{
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
cell.setCellValue(sdf.format(cell.getNumericCellValue()));
c = sdf.format(cell.getNumericCellValue());
}
else
{
c = cell.getStringCellValue();
}
}
else if (java.math.BigDecimal.class == fieldType)
{
c = cell.getStringCellValue();
}
}
if (entity != null)
{
list.add(entity);
}
}
}
return list;
}
/**
* 对list数据源将其里面的数据导入到excel表单
*
* @param sheetName 工作表的名称
*/
public AjaxResult exportExcel(List<T> list, String sheetName)
{
Field[] allFields = clazz.getDeclaredFields();// 得到所有定义字段
List<Field> fields = new ArrayList<Field>();
// 得到所有field并存放到一个list中.
for (Field field : allFields)
{
if (field.isAnnotationPresent(Excel.class))
{
fields.add(field);
}
}
HSSFWorkbook workbook = new HSSFWorkbook();// 产生工作薄对象
// excel2003中每个sheet中最多有65536行
int sheetSize = 65536;
double sheetNo = Math.ceil(list.size() / sheetSize);// 取出一共有多少个sheet.
for (int index = 0; index <= sheetNo; index++)
{
HSSFSheet sheet = workbook.createSheet();// 产生工作表对象
if (sheetNo == 0)
{
workbook.setSheetName(index, sheetName);
}
else
{
workbook.setSheetName(index, sheetName + index);// 设置工作表的名称.
}
HSSFRow row;
HSSFCell cell; // 产生单元格
row = sheet.createRow(0); // 产生一行
// 写入各个字段的列头名称
for (int i = 0; i < fields.size(); i++)
{
Field field = fields.get(i);
Excel attr = field.getAnnotation(Excel.class);
int col = getExcelCol(attr.column()); // 获得列号
cell = row.createCell(col); // 创建列
cell.setCellType(HSSFCell.CELL_TYPE_STRING); // 设置列中写入内容为String类型
HSSFCellStyle cellStyle = workbook.createCellStyle();
cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
cellStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
if (attr.name().indexOf("注：") >= 0)
{
HSSFFont font = workbook.createFont();
font.setColor(HSSFFont.COLOR_RED);
cellStyle.setFont(font);
cellStyle.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);
sheet.setColumnWidth(i, 6000);
}
else
{
HSSFFont font = workbook.createFont();
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); // 粗体显示
cellStyle.setFont(font); // 选择需要用到的字体格式
cellStyle.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);
// 设置列宽
sheet.setColumnWidth(i, 3766);
}
cellStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
cellStyle.setWrapText(true);
cell.setCellStyle(cellStyle);
cell.setCellValue(attr.name());// 写入列名
// 如果设置了提示信息则鼠标放上去提示.
if (!attr.prompt().trim().equals(""))
{
setHSSFPrompt(sheet, "", attr.prompt(), 1, 100, col, col); // 这里默认设了2-101列提示.
}
// 如果设置了combo属性则本列只能选择不能输入
if (attr.combo().length > 0)
{
setHSSFValidation(sheet, attr.combo(), 1, 100, col, col); // 这里默认设了2-101列只能选择不能输入.
}
}
int startNo = index * sheetSize;
int endNo = Math.min(startNo + sheetSize, list.size());
// 写入各条记录,每条记录对应excel表中的一行
HSSFCellStyle cs = workbook.createCellStyle();
cs.setAlignment(HSSFCellStyle.ALIGN_CENTER);
cs.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
for (int i = startNo; i < endNo; i++)
{
row = sheet.createRow(i + 1 - startNo);
T vo = (T) list.get(i); // 得到导出对象.
for (int j = 0; j < fields.size(); j++)
{
Field field = fields.get(j); // 获得field.
field.setAccessible(true); // 设置实体类私有属性可访问
Excel attr = field.getAnnotation(Excel.class);
try
{
// 根据Excel中设置情况决定是否导出,有些情况需要保持为空,希望用户填写这一列.
if (attr.isExport())
{
cell = row.createCell(getExcelCol(attr.column()));// 创建cell
cell.setCellStyle(cs);
try
{
if (String.valueOf(field.get(vo)).length() > 10)
throw new Exception("长度超过10位就不用转数字了");
// 如果可以转成数字则导出为数字类型
BigDecimal bc = new BigDecimal(String.valueOf(field.get(vo)));
cell.setCellType(HSSFCell.CELL_TYPE_NUMERIC);
cell.setCellValue(bc.doubleValue());
}
catch (Exception e)
{
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
if (vo == null)
{
cell.setCellValue(""); // 如果数据存在就填入,不存在填入空格.
}
else
{
cell.setCellValue(field.get(vo) == null ? "" : String.valueOf(field.get(vo)));// 如果数据存在就填入,不存在填入空格.
}
}
}
}
catch (Exception e)
{
log.error("导出Excel失败{}", e);
}
}
}
}
try
{
String filename = encodingFilename(sheetName);
OutputStream out = new FileOutputStream(getfile() + filename);
workbook.write(out);
out.close();
return AjaxResult.success(filename);
}
catch (Exception e)
{
log.error("关闭flush失败{}", e);
return AjaxResult.error("导出Excel失败，请联系网站管理员！");
}
}
/**
* 将EXCEL中A,B,C,D,E列映射成0,1,2,3
*
* @param col
*/
public static int getExcelCol(String col)
{
col = col.toUpperCase();
// 从-1开始计算,字母重1开始运算。这种总数下来算数正好相同。
int count = -1;
char[] cs = col.toCharArray();
for (int i = 0; i < cs.length; i++)
{
count += (cs[i] - 64) * Math.pow(26, cs.length - 1 - i);
}
return count;
}
/**
* 设置单元格上提示
*
* @param sheet 要设置的sheet.
* @param promptTitle 标题
* @param promptContent 内容
* @param firstRow 开始行
* @param endRow 结束行
* @param firstCol 开始列
* @param endCol 结束列
* @return 设置好的sheet.
*/
public static HSSFSheet setHSSFPrompt(HSSFSheet sheet, String promptTitle, String promptContent, int firstRow,
int endRow, int firstCol, int endCol)
{
// 构造constraint对象
DVConstraint constraint = DVConstraint.createCustomFormulaConstraint("DD1");
// 四个参数分别是：起始行、终止行、起始列、终止列
CellRangeAddressList regions = new CellRangeAddressList(firstRow, endRow, firstCol, endCol);
// 数据有效性对象
HSSFDataValidation data_validation_view = new HSSFDataValidation(regions, constraint);
data_validation_view.createPromptBox(promptTitle, promptContent);
sheet.addValidationData(data_validation_view);
return sheet;
}
/**
* 设置某些列的值只能输入预制的数据,显示下拉框.
*
* @param sheet 要设置的sheet.
* @param textlist 下拉框显示的内容
* @param firstRow 开始行
* @param endRow 结束行
* @param firstCol 开始列
* @param endCol 结束列
* @return 设置好的sheet.
*/
public static HSSFSheet setHSSFValidation(HSSFSheet sheet, String[] textlist, int firstRow, int endRow,
int firstCol, int endCol)
{
// 加载下拉列表内容
DVConstraint constraint = DVConstraint.createExplicitListConstraint(textlist);
// 设置数据有效性加载在哪个单元格上,四个参数分别是：起始行、终止行、起始列、终止列
CellRangeAddressList regions = new CellRangeAddressList(firstRow, endRow, firstCol, endCol);
// 数据有效性对象
HSSFDataValidation data_validation_list = new HSSFDataValidation(regions, constraint);
sheet.addValidationData(data_validation_list);
return sheet;
}
/**
* 编码文件名
*/
public String encodingFilename(String filename)
{
filename = UUID.randomUUID().toString() + "_" + filename + ".xls";
return filename;
}
public String getfile() throws FileNotFoundException
{
return ResourceUtils.getURL("classpath:").getPath() + "static/file/";
}
}