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作者 朱兆平
提交 b4f7dbcf1771ba8bcd367ad87ade82a37f8aef9c 1 个父辈 ad282e19

后端导出excel

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正在显示 2 个修改的文件 包含 227 行增加 和 0 行删除
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<version>1.18.10</version>
<scope>compile</scope>
</dependency>
<!-- excel导出-->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>4.1.0</version>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-core</artifactId>
<version>9.0.30</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-core</artifactId>
<version>9.0.30</version>
<scope>compile</scope>
</dependency>
</dependencies>
<build>
... ...
package com.tianbo.util.POI;
import lombok.extern.slf4j.Slf4j;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Iterator;
import java.util.List;
/**
* @author: lucifer
* @description: Excel导出工具类
*/
@Slf4j
public class ExportExcelUtil<T> {
/**
* excel ./xls后缀
*/
public static final String EXTENSION_XLS = ".xls";
/**
* excel ./xlsx后缀
*/
public static final String EXTENSION_XLSX = ".xlsx";
/**
* 导出文件夹路径
*/
public static final String EXCEL_PATH = "./upload/";
/**
* 兼容.xls和.xlsx格式
*
* @param originalFilename
* @return
*/
private Workbook getWorkbook(String originalFilename) {
Workbook workbook = null;
if (originalFilename.endsWith(EXTENSION_XLS)) {
workbook = new HSSFWorkbook();
} else if (originalFilename.endsWith(EXTENSION_XLSX)) {
workbook = new XSSFWorkbook();
}
return workbook;
}
/**
* 导出
*
* @param originalFilename
* @param sheetName
* @param headers
* @param columns
* @param lists
* @throws Exception
*/
public void export(String originalFilename, String sheetName, String[] headers, String[] columns, List<T> lists,HttpServletResponse response) throws Exception {
Workbook workbook = getWorkbook(originalFilename);
Sheet sheet = workbook.createSheet(sheetName);
sheet.setDefaultColumnWidth(15);
//设置表头样式
CellStyle style = setHeaderStyle(workbook);
Row row = sheet.createRow(0);
for (int i = 0; i < headers.length; i++) {
Cell headerCell = row.createCell(i);
headerCell.setCellValue(headers[i]);
headerCell.setCellStyle(style);
}
Iterator<T> it = lists.iterator();
int rowIndex = 0;
while (it.hasNext()) {
rowIndex++;
row = sheet.createRow(rowIndex);
T t = it.next();
Field[] fields = t.getClass()
.getDeclaredFields();
for (int i = 0; i < fields.length; i++) {
Field field = fields[i];
String fieldName = field.getName();
for (int j = 0; j < columns.length; j++) {
if (fieldName.equals(columns[j])) {
String getMethodName = "get" +
fieldName.substring(0, 1).
toUpperCase() + fieldName.
substring(1);
Class cls = t.getClass();
Method getMethod = cls.getMethod(
getMethodName, new Class[]{});
Object val = getMethod.invoke(
t, new Object[]{});
String textVal;
if (null != val) {
textVal = val.toString();
} else {
textVal = "";
}
Cell cell = row.createCell(j);
cell.setCellValue(textVal);
// CellStyle cellStyle = setCellStyle(workbook, i);
cell.setCellStyle(style);
//单元格列宽设置
sheet.autoSizeColumn(j);
sheet.setColumnWidth(j, sheet.getColumnWidth(j)*17/10 > 255 * 256 ? 255 * 256 : sheet.getColumnWidth(j)*17/10);
log.info("i:===============" + i + ",j:================" + j + ",textVal:" + textVal);
}
}
}
}
String filename = sheetName + System.currentTimeMillis() + ".xls";
//判断是否有文件夹，没有就创建
File file = new File(EXCEL_PATH);
if (!file.exists()) {
file.mkdirs();
}
String filepath = EXCEL_PATH + filename;
System.out.println("filepath:" + filepath);
FileOutputStream out = new FileOutputStream(filepath);
workbook.write(out);
out.close();
downloadExcel(filepath, response);
}
/**
* 设置表头样式
*
* @param workbook
* @return
*/
private CellStyle setHeaderStyle(Workbook workbook) {
CellStyle cellStyle = workbook.createCellStyle();
//水平居中
cellStyle.setAlignment(HorizontalAlignment.CENTER_SELECTION);
//垂直居中
cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
//设置边框
cellStyle.setBorderTop(BorderStyle.THIN);
cellStyle.setBorderRight(BorderStyle.THIN);
cellStyle.setBorderBottom(BorderStyle.THIN);
cellStyle.setBorderLeft(BorderStyle.THIN);
//设置字体
Font cellFont = workbook.createFont();
cellFont.setBold(true);
cellStyle.setFont(cellFont);
return cellStyle;
}
/**
* 设置单元格样式
*/
private CellStyle setCellStyle(Workbook workbook, int i) {
CellStyle cellStyle = workbook.createCellStyle();
//奇数列 左对齐
if ((i & 1) != 1) {
cellStyle.setAlignment(HorizontalAlignment.LEFT);
} else {
//水平居中
cellStyle.setAlignment(HorizontalAlignment.CENTER_SELECTION);
}
//垂直居中
cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
//设置边框
cellStyle.setBorderTop(BorderStyle.THIN);
cellStyle.setBorderRight(BorderStyle.THIN);
cellStyle.setBorderBottom(BorderStyle.THIN);
cellStyle.setBorderLeft(BorderStyle.THIN);
//设置字体
Font cellFont = workbook.createFont();
cellFont.setFontName("仿宋_GB2312");
cellStyle.setFont(cellFont);
return cellStyle;
}
/**
* 下载
*/
public static void downloadExcel(String filepath, HttpServletResponse response)
throws IOException {
File file = new File(filepath);
String fileName = file.getName();
response.setContentType("application/vnd.ms-excel;charset=utf-8");
response.addHeader("Content-Transfer-Encoding", "binary");
response.addHeader("Content-Disposition", "attachment;filename=" + new String(fileName.getBytes("UTF-8"), "ISO8859-1"));
response.setCharacterEncoding("utf-8");
InputStream fis = new BufferedInputStream(new FileInputStream(file));
byte[] b = new byte[fis.available()];
fis.read(b);
response.getOutputStream().write(b);
fis.close();
log.info("导出完毕");
}
}
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