From b4f7dbcf1771ba8bcd367ad87ade82a37f8aef9c Mon Sep 17 00:00:00 2001
From: mrz <17966059@qq.com>
Date: Wed, 15 Apr 2020 17:04:43 +0800
Subject: [PATCH] 后端导出excel
---
pom.xml | 18 ++++++++++++++++++
src/main/java/com/tianbo/util/POI/ExportExcelUtil.java | 209 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 227 insertions(+), 0 deletions(-)
create mode 100644 src/main/java/com/tianbo/util/POI/ExportExcelUtil.java
diff --git a/pom.xml b/pom.xml
index 33d42c1..93beca0 100755
--- a/pom.xml
+++ b/pom.xml
@@ -54,6 +54,24 @@
<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>
diff --git a/src/main/java/com/tianbo/util/POI/ExportExcelUtil.java b/src/main/java/com/tianbo/util/POI/ExportExcelUtil.java
new file mode 100644
index 0000000..606df40
--- /dev/null
+++ b/src/main/java/com/tianbo/util/POI/ExportExcelUtil.java
@@ -0,0 +1,209 @@
+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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