使用的是idea+restful风格 第一:引入依赖为: !--poi-- dependency groupIdorg.apache.xmlbeans/groupId artifactIdxmlbeans/artifactId version2.6.0/version /dependency dependency groupIddom4j/groupId artifactIddom4j/artifactId version1
使用的是idea+restful风格
第一:引入依赖为:
<!--poi--> <dependency> <groupId>org.apache.xmlbeans</groupId> <artifactId>xmlbeans</artifactId> <version>2.6.0</version> </dependency> <dependency> <groupId>dom4j</groupId> <artifactId>dom4j</artifactId> <version>1.6.1</version> </dependency> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>3.9</version> </dependency> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> <version>3.9</version> </dependency> <!--poi-->
第二步:
上传文件的工具类
import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.lang.reflect.Method; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServletResponse; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.CellStyle; import org.apache.poi.ss.usermodel.Font; import org.apache.poi.ss.usermodel.IndexedColors; import org.apache.poi.ss.usermodel.Row; import org.apache.poi.ss.usermodel.Sheet; import org.apache.poi.ss.usermodel.Workbook; /** * @author qingmu * @version 创建时间:2017年12月28日 下午4:53:29 * 类说明: POI导出工具类 */ public class ExportPOIUtils { //参数说明: fileName:文件名 projects:对象集合 columnNames: 列名 keys: map中的key public static void start_download(HttpServletResponse response, String fileName, List<?> projects, String[] columnNames, String[] keys) throws IOException { //将集合中对象的属性 对应到 List<Map<String,Object>> List<Map<String,Object>> list=createExcelRecord(projects, keys); ByteArrayOutputStream os = new ByteArrayOutputStream(); try { //将转换成的Workbook对象通过流形式下载 createWorkBook(list,keys,columnNames).write(os); } catch (IOException e) { e.printStackTrace(); } byte[] content = os.toByteArray(); InputStream is = new ByteArrayInputStream(content); // 设置response参数,可以打开下载页面 response.reset(); response.setContentType("application/vnd.ms-excel;charset=utf-8"); response.setHeader("Content-Disposition", "attachment;filename="+ new String((fileName + ".xls").getBytes(), "iso-8859-1")); ServletOutputStream out = response.getOutputStream(); BufferedInputStream bis = null; BufferedOutputStream bos = null; try { bis = new BufferedInputStream(is); bos = new BufferedOutputStream(out); byte[] buff = new byte[2048]; int bytesRead; while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) { bos.write(buff, 0, bytesRead); } } catch (final IOException e) { throw e; } finally { if (bis != null) bis.close(); if (bos != null) bos.close(); } } private static List<Map<String, Object>> createExcelRecord(List<?> projects, String[] keys) { List<Map<String, Object>> listmap = new ArrayList<Map<String, Object>>(); Map<String, Object> map = new HashMap<String, Object>(); map.put("sheetName", "sheet"); listmap.add(map); Object project=null; for (int j = 0; j < projects.size(); j++) { project=projects.get(j); Map<String, Object> mapValue = new HashMap<String, Object>(); for(int i=0; i<keys.length; i++){ mapValue.put(keys[i], getFieldValueByName(keys[i], project)); } listmap.add(mapValue); } return listmap; } /** * 利用反射 根据属性名获取属性值 * */ private static Object getFieldValueByName(String fieldName, Object o) { try { String firstLetter = fieldName.substring(0, 1).toUpperCase(); String getter = "get" + firstLetter + fieldName.substring(1); Method method = o.getClass().getMethod(getter, new Class[] {}); Object value = method.invoke(o, new Object[] {}); return value; } catch (Exception e) { e.printStackTrace(); return null; } } /** * 创建excel文档对象 * @param keys list中map的key数组集合 * @param columnNames excel的列名 * */ private static Workbook createWorkBook(List<Map<String, Object>> list,String []keys,String columnNames[]) { // 创建excel工作簿 Workbook wb = new HSSFWorkbook(); // 创建第一个sheet(页),并命名 Sheet sheet = wb.createSheet(list.get(0).get("sheetName").toString()); // 手动设置列宽。第一个参数表示要为第几列设;,第二个参数表示列的宽度,n为列高的像素数。 for(int i=0;i<keys.length;i++){ sheet.setColumnWidth((short) i, (short) (35.7 * 150)); } // 创建第一行 Row row = sheet.createRow((short) 0); // 创建两种单元格格式 CellStyle cs = wb.createCellStyle(); CellStyle cs2 = wb.createCellStyle(); // 创建两种字体 Font f = wb.createFont(); Font f2 = wb.createFont(); // 创建第一种字体样式(用于列名) f.setFontHeightInPoints((short) 10); f.setColor(IndexedColors.BLACK.getIndex()); f.setBoldweight(Font.BOLDWEIGHT_BOLD); // 创建第二种字体样式(用于值) f2.setFontHeightInPoints((short) 10); f2.setColor(IndexedColors.BLACK.getIndex()); // 设置第一种单元格的样式(用于列名) cs.setFont(f); cs.setBorderLeft(CellStyle.BORDER_THIN); cs.setBorderRight(CellStyle.BORDER_THIN); cs.setBorderTop(CellStyle.BORDER_THIN); cs.setBorderBottom(CellStyle.BORDER_THIN); cs.setAlignment(CellStyle.ALIGN_CENTER); // 设置第二种单元格的样式(用于值) cs2.setFont(f2); cs2.setBorderLeft(CellStyle.BORDER_THIN); cs2.setBorderRight(CellStyle.BORDER_THIN); cs2.setBorderTop(CellStyle.BORDER_THIN); cs2.setBorderBottom(CellStyle.BORDER_THIN); cs2.setAlignment(CellStyle.ALIGN_CENTER); //设置列名 for(int i=0;i<columnNames.length;i++){ Cell cell = row.createCell(i); cell.setCellValue(columnNames[i]); cell.setCellStyle(cs); } //设置每行每列的值 for (short i = 1; i < list.size(); i++) { // Row 行,Cell 方格 , Row 和 Cell 都是从0开始计数的 // 创建一行,在页sheet上 Row row1 = sheet.createRow((short) i); // 在row行上创建一个方格 for(short j=0;j<keys.length;j++){ Cell cell = row1.createCell(j); cell.setCellValue(list.get(i).get(keys[j]) == null?" ": list.get(i).get(keys[j]).toString()); cell.setCellStyle(cs2); } } return wb; } }
第三步:controller层的编写
import com.example.uploaddemo.util.ExportPOIUtils; import org.springframework.web.bind.annotation.RequestMapping; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.util.ArrayList; import java.util.List; /** * @author qingmu * @date */ public class UserController { @RequestMapping("exportList") public void exportList(HttpServletResponse response, String ids) { String fileName = "人员档案列表"; List<User> users = new ArrayList<User>(); // 列名 String columnNames[] = {"ID", "姓名", "性别", "所属部门", "所属单位", "邮箱", "电话", "手机", "学历/学位", "专业/专科方向", "直属上级", "账号锁定"}; // map中的key String keys[] = {"id", "userName", "gender", "dept", "unit", "email", "tel", "phone", "degree", "major", "parentName", "isLocked"}; try { ExportPOIUtils.start_download(response, fileName, users, columnNames, keys); } catch (IOException e) { e.printStackTrace(); } } }
这里少了一个user实体类,你可以直接替换成你的要导出的实体类,就ok了.
简洁的代码,又高效的代码.
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持自由互联。