springboot使用poi进行数据的导出过程详解

    
      org.apache.xmlbeans
      xmlbeans
      2.6.0
    
    
      dom4j
      dom4j
      1.6.1
    
    
      org.apache.poi
      poi
      3.9
    
    
      org.apache.poi
      poi-ooxml
      3.9
    
    

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>
    List> 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> createExcelRecord(List<?> projects, String[] keys) {
    List> listmap = new ArrayList>();
    Map map = new HashMap();
    map.put("sheetName", "sheet");
    listmap.add(map);
    Object project=null;
    for (int j = 0; j < projects.size(); j++) {
      project=projects.get(j);
      Map mapValue = new HashMap();
      for(int i=0; i> 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

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 users = new ArrayList();

    // 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();
    }
  }
}