189 lines
6.8 KiB
Java
189 lines
6.8 KiB
Java
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import org.apache.poi.ss.usermodel.Cell;
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import org.apache.poi.ss.usermodel.Row;
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import org.apache.poi.ss.usermodel.Sheet;
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import org.apache.poi.xssf.streaming.SXSSFWorkbook;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import java.io.OutputStream;
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import java.lang.reflect.Field;
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import java.net.URLEncoder;
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import java.text.SimpleDateFormat;
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import java.util.*;
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/**
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* Description 支持多sheet表格
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*
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* @author fxb
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* @Date 2018-08-23
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*/
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public class ExcelUtil {
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private Logger log = LoggerFactory.getLogger(this.getClass());
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/**
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* 表格文件名
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*/
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private String fileName;
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/**
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* 表格数据项，string为sheet名，List<Object[]> 为这个sheet的数据
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*/
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private HashMap<String, List<?>> data;
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/**
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* 每个sheet的表头，String为sheet名，String[][] 为object的属性名与表头的对应关系,例如：["id","对象id"]
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*/
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private LinkedHashMap<String, String[][]> headers;
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private static final String IE = "msie";
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private static final String OPERA = "opera";
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private static final String SAFARI = "safari";
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private static final String FIREFOX = "mozilla";
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public ExcelUtil(String fileName, HashMap<String, List<?>> data, LinkedHashMap<String, String[][]> headers) {
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this.fileName = fileName;
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this.data = data;
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this.headers = headers;
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}
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/**
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* Description 创建表格
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*
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* @return org.apache.poi.hssf.usermodel.HSSFWorkbook
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* @author fxb
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* @date 2018/8/23
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*/
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public SXSSFWorkbook createExcel() throws Exception {
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try {
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//只在内存中保留五百条记录，五百条之前的会写到磁盘上，后面无法再操作
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SXSSFWorkbook workbook = new SXSSFWorkbook(500);
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//遍历headers创建表格
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for (String key : headers.keySet()) {
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this.createSheet(workbook, key, headers.get(key), this.data.get(key));
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}
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return workbook;
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} catch (Exception e) {
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log.error("创建表格失败:{}", e.getMessage());
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throw e;
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}
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}
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public void writeToResponse(SXSSFWorkbook workbook, HttpServletRequest request, HttpServletResponse response) throws Exception {
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String userAgent = request.getHeader("User-Agent");
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String fileName = "Excel-" + this.fileName + ".xls";
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String encodeFileName = URLEncoder.encode(fileName, "UTF8");
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// 如果没有userAgent，则默认使用IE的方式进行编码
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String rtn = "filename=\"" + encodeFileName + "\"";
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if (userAgent != null) {
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userAgent = userAgent.toLowerCase();
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if (userAgent.contains(IE)) {
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// IE浏览器，只能采用URLEncoder编码
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rtn = "filename=\"" + encodeFileName + "\"";
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} else if (userAgent.contains(OPERA)) {
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// Opera浏览器只能采用filename*
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rtn = "filename*=UTF-8''" + encodeFileName;
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} else if (userAgent.contains(SAFARI)) {
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// Safari浏览器，只能采用ISO编码的中文输出
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rtn = "filename=\"" + new String(fileName.getBytes("UTF-8"), "ISO8859-1") + "\"";
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} else if (userAgent.contains(FIREFOX)) {
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// FireFox浏览器，可以使用MimeUtility或filename*或ISO编码的中文输出
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rtn = "filename*=UTF-8''" + encodeFileName;
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}
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}
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String headStr = "attachment; " + rtn;
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response.setContentType("APPLICATION/ms-excel");
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response.setCharacterEncoding("utf-8");
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response.setHeader("Content-Disposition", headStr);
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OutputStream out1 = response.getOutputStream();
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workbook.write(out1);
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}
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/**
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* 创建一个sheet
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*
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* @param workbook workbook
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* @param sheetName 名称
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* @param header 表头
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* @param data 数据
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*/
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private void createSheet(SXSSFWorkbook workbook, String sheetName, String[][] header, List<?> data) throws Exception {
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Sheet sheet = workbook.createSheet(sheetName);
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// 单元行，单元格
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Row row;
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Cell cell;
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//列数
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int cellNum = header.length;
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//设置表头
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row = sheet.createRow(0);
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for (int i = 0; i < cellNum; i++) {
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cell = row.createCell(i);
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String str = header[i][1];
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cell.setCellValue(str);
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//设置列宽为表头的宽度+4
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sheet.setColumnWidth(i, (str.getBytes("utf-8").length + 6) * 256);
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}
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int rowNum = data.size();
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if (rowNum == 0) {
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return;
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}
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//获取Object 属性名与field属性的映射，后面通过反射获取值来设置到cell
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Field[] fields = data.get(0).getClass().getDeclaredFields();
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Map<String, Field> fieldMap = new HashMap<>(fields.length);
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for (Field field : fields) {
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field.setAccessible(true);
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fieldMap.put(field.getName(), field);
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}
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Object object;
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for (int i = 0; i < rowNum; i++) {
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row = sheet.createRow(i + 1);
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object = data.get(i);
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for (int j = 0; j < cellNum; j++) {
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cell = row.createCell(j);
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this.setCell(cell, object, fieldMap, header[j][0]);
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}
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}
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}
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private SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
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/**
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* 设置单元格,根据fieldName获取对应的Field类，使用反射得到值
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*
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* @param cell cell
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* @param obj obj
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* @param fieldMap 属性名与Field的映射
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* @param fieldName 属性名
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*/
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private void setCell(Cell cell, Object obj, Map<String, Field> fieldMap, String fieldName) throws Exception {
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Field field = fieldMap.get(fieldName);
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if(field == null){
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throw new Exception("找不到 "+fieldName+" 数据项");
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}
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Object value = field.get(obj);
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if (value == null) {
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cell.setCellValue("");
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} else {
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switch (field.getGenericType().getTypeName()) {
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case "java.lang.String":
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cell.setCellValue((String) value);
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break;
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case "java.lang.Integer":
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case "int":
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cell.setCellValue((int) value);
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break;
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case "java.lang.Double":
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case "double":
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cell.setCellValue((double) value);
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break;
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case "java.util.Date":
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cell.setCellValue(this.dateFormat.format((Date) value));
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break;
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default:
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cell.setCellValue(obj.toString());
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}
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}
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}
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}
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