java導出EXCEL方法模板

 excel導出到指定地址

import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.time.DateFormatUtils;
import org.apache.poi.hssf.usermodel.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.beans.PropertyDescriptor;
import java.io.FileOutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.List;


/**
 * @Description:
 * @Author: Yongkang Hou
 * @Date: 2019-07-22
 */
public class FilePortUtil {

    private static final Logger log = LoggerFactory.getLogger (FilePortUtil.class);

    /**
     * 導出功能
     * 注意：泛型T類字段名和containBean集合裏字段名字的一致性
     *
     * @param
     * @param title       表名
     * @param headers     表頭
     * @param list        數據集
     * @param containBean 數據集類型字段
     * @param <T>
     * @throws Exception
     */
    public static <T> void exportExcel(String fileName, String title, String[] headers, List <T> list, List <String> containBean) throws Exception {
        HSSFWorkbook workbook = null;
        FileOutputStream fos = new FileOutputStream ("/Users/houyongkang/" + fileName, false);
        try {
            workbook = new HSSFWorkbook ();
            //集合分組，劃分多個sheet
            int sheetIndex = 1;
            //每10000行爲一個sheet
            int numRow = 10000;
            int remainder = list.size () % numRow; //(先計算出餘數)
            int number = list.size () / numRow; //然後是商
            if (0 != remainder) {
                number = number + 1;
            }
            for (int y = 0; y < number; y++) {
                List list1 = new ArrayList ();
                if (y < number - 1) {
                    list1 = list.subList (y * numRow, (y + 1) * numRow);
                } else {
                    list1 = list.subList (numRow * (number - 1), list.size ());
                }
                HSSFSheet sheet = workbook.createSheet (title + sheetIndex);
                sheetIndex++;
                HSSFRow row = sheet.createRow (0);

                /*創建第一行表頭*/
                for (short i = 0; i < headers.length; i++) {
                    HSSFCell cell = row.createCell (i);
                    HSSFRichTextString text = new HSSFRichTextString (headers[i]);
                    cell.setCellValue (text);
                }
                Iterator <T> it = list1.iterator ();
                int index = 0;
                while (it.hasNext ()) {
                    index++;
                    row = sheet.createRow (index);
                    T t = (T) it.next ();
                    /*反射得到字段*/
                    Field[] fields = t.getClass ().getDeclaredFields ();
                    /*如果需要匹配*/
                    if (CollectionUtils.isNotEmpty (containBean)) {
                        for (int j = 0; j < containBean.size (); j++) {
                            for (int i = 0; i < fields.length; i++) {
                                Field field = fields[i];
                                if (!field.getName ().equals (containBean.get (j))) continue;
                                /*給每一列set值*/
                                setCellValue (t, field, row, j);
                            }
                        }
                    } else {
                        for (int i = 0; i < fields.length; i++) {
                            Field field = fields[i];
                            setCellValue (t, field, row, i);
                        }
                    }
                }


            }

            fos.flush ();
            workbook.write (fos);
        } finally {

            fos.close ();
            workbook.close ();
        }
    }

    /**
     * 設置每一行中的列
     *
     * @param t
     * @param field
     * @param row
     * @param index
     * @param <T>
     */
    private static <T> void setCellValue(T t, Field field, HSSFRow row, int index) {
        HSSFCell cell = row.createCell (index);
        Object value = invoke (t, field);
        String textValue = null;
        if (value != null) {
            if (value instanceof Date) {
                Date date = (Date) value;
                textValue = DateFormatUtils.format (date, "yyyy-MM-dd HH:mm:ss");
            } else {
                textValue = value.toString ();
            }
        }
        if (textValue != null) {
            cell.setCellValue (textValue);
        }
    }

    /**
     * 反射映射數據集字段
     *
     * @param t
     * @param field
     * @param <T>
     * @return
     */
    private static <T> Object invoke(T t, Field field) {
        try {
            String fieldName = field.getName ();
            PropertyDescriptor pd = new PropertyDescriptor (fieldName, t.getClass ());
            Method method = pd.getReadMethod ();
            return method.invoke (t);
        } catch (Exception e) {
            return null;
        }
    }


}

測試： 

 public void portTest() {
        String[] title = {"姓名", "年齡"};

        List <Student> studentList = new ArrayList <> ();
        for (int i = 0; i < 10; i++) {
            Student student = new Student ();
            student.setAge (String.valueOf (i));
            student.setName ("張三" + i);
            studentList.add (student);
        }
        List <String> strings = new ArrayList <> ();
        strings.add ("name");
        strings.add ("age");
        try {
            SimpleDateFormat dateFormat = new SimpleDateFormat ("yyyy-MM-dd");
            String date = dateFormat.format (new Date ());
            String fileName = "導出實驗" + date+".xls";
            String titleName = "單元";
            FilePortUtil.exportExcel ( new String ((fileName).getBytes ()),titleName, title, studentList, strings);
        } catch (Exception e) {
            e.printStackTrace ();
        }
        System.out.println ("導出結束");
    }

導出excel 瀏覽器下載

import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.time.DateFormatUtils;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.ss.usermodel.Sheet;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.http.HttpServletResponse;
import java.beans.PropertyDescriptor;
import java.io.*;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.*;


/**
 * @Description:
 * @Author: Yongkang Hou
 * @Date: 2019-07-22
 */
public class FilePortUtil {

    private static final Logger log = LoggerFactory.getLogger (FilePortUtil.class);

    /**
     * 導出功能
     * 注意：泛型T類字段名和containBean集合裏字段名字的一致性
     *
     * @param
     * @param filmName    表名
     * @param headers     表頭
     * @param list        數據集
     * @param containBean 數據集類型字段
     * @param <T>
     * @throws Exception
     */
    public static <T> void exportExcel(HttpServletResponse response, String filmName, String sheetTitle, String[] headers, List <T> list, List <String> containBean) {
        HSSFWorkbook workbook = null;
        BufferedOutputStream out = null;
        try {
            workbook = new HSSFWorkbook ();
            HSSFSheet sheet = workbook.createSheet (sheetTitle);
            HSSFRow row = sheet.createRow (0);
            /*創建第一行表頭*/
            for (short i = 0; i < headers.length; i++) {
                HSSFCell cell = row.createCell (i);
                HSSFRichTextString text = new HSSFRichTextString (headers[i]);
                cell.setCellValue (text);
            }
            Iterator <T> it = list.iterator ();
            int index = 0;
            while (it.hasNext ()) {
                index++;
                row = sheet.createRow (index);
                T t = (T) it.next ();
                /*反射得到字段*/
                Field[] fields = t.getClass ().getDeclaredFields ();
                /*如果需要匹配*/
                if (CollectionUtils.isNotEmpty (containBean)) {
                    for (int j = 0; j < containBean.size (); j++) {
                        for (int i = 0; i < fields.length; i++) {
                            Field field = fields[i];
                            if (!field.getName ().equals (containBean.get (j))) continue;
                            /*給每一列set值*/
                            setCellValue (t, field, row, j);
                        }
                    }
                } else {
                    for (int i = 0; i < fields.length; i++) {
                        Field field = fields[i];
                        setCellValue (t, field, row, i);
                    }
                }
            }
            /*application/vnd.ms-excel告訴瀏覽器要下載的是個excel*/
            response.setContentType ("application/vnd.ms-excel;charset=UTF-8");
            /*請求頭設置，Content-Disposition爲下載標識，attachment標識以附件方式下載*/
            response.addHeader ("Content-Disposition", "attachment;filename=" + new String(filmName.getBytes("utf-8"),"iso8859-1") + ".xls");
          
            OutputStream outputStream = response.getOutputStream ();
            out = new BufferedOutputStream (outputStream);
            out.flush ();
            workbook.write (out);
      
        } catch (Exception e) {
            log.error ("導出異常，錯誤信息", e);
            throw new RuntimeException (e.getMessage ());
        } finally {
            try {
                workbook.close ();
                out.close ();
            } catch (IOException e) {
                log.error ("流關閉異常，錯誤信息", e);
            }

        }
    }


    /**
     * 設置每一行中的列
     *
     * @param t
     * @param field
     * @param row
     * @param index
     * @param <T>
     */
    private static <T> void setCellValue(T t, Field field, HSSFRow row, int index) {
        HSSFCell cell = row.createCell (index);
        Object value = invoke (t, field);
        String textValue = null;
        if (value != null) {
            if (value instanceof Date) {
                Date date = (Date) value;
                textValue = DateFormatUtils.format (date, "yyyy-MM-dd HH:mm:ss");
            } else {
                textValue = value.toString ();
            }
        }
        if (textValue != null) {
            cell.setCellValue (textValue);
        }
    }

    /**
     * 反射映射數據集字段
     *
     * @param t
     * @param field
     * @param <T>
     * @return
     */
    private static <T> Object invoke(T t, Field field) {
        try {
            String fieldName = field.getName ();
            PropertyDescriptor pd = new PropertyDescriptor (fieldName, t.getClass ());
            Method method = pd.getReadMethod ();
            return method.invoke (t);
        } catch (Exception e) {
            return null;
        }
    }


}