Java通用的Excel文件生成工具类,支持生成文件和浏览器直接下载

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java通用的Excel文件创建方法,支持同文件多tab页创建。只需要调用静态方法,传递List<String>表头和List<Map>数据集合等,即可生成Excel文件。
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package com.matols.utils;
  
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
  
import javax.servlet.http.HttpServletResponse;
  
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
  
import com.google.common.collect.Lists;
  
/**
 * Excel工具类
 */
public class ExcelUtils {
    public static void main(String[] args) throws Throwable {
        String path = "D:/tj/统计报表.xls";
        //表头
        List<String> headers = Lists.newArrayList();
        for (int i = 1; i < 10; i++) {
            headers.add("表头"+i);
        }
        //数据行
        List<Map> datas = new ArrayList<Map>();
        Map m = null;
        for(int i=1;i<10;i++){
            m = new HashMap(); //一行数据集
            for(int j=0;j<headers.size();j++){
                m.put(j, "第"+i+" 行数据:"+j);
            }
            datas.add(m);
        }
        ExpExs(path,"","统计报表",headers,datas);
    }
      
    /*
     * 通用的Excel文件创建方法
     *   title:首行标题: 2015年度统计报表
     *  sheets:sheet的tab标签页说明: 15年度报表
     * headers:表头:List存放表头  编号、姓名、备注
     *   datas:数据行:list存放实体数据,map存放具体每一行数据,和headers对应。
     *      rs:HttpServletResponse响应作用域,如果不为null,会直接将文件流输出到客户端,下载文件
     */
    public static void ExpExs(String title,String sheets,List headers,List<Map> datas,HttpServletResponse rs){
        try {
            if(sheets== null || "".equals(sheets)){ sheets = "sheet"; }
               
            HSSFWorkbook workbook = new HSSFWorkbook();
            HSSFSheet sheet = workbook.createSheet(sheets); //+workbook.getNumberOfSheets()
              
            HSSFRow row;
            HSSFCell cell;
               
            // 设置这些样式
            HSSFFont font = workbook.createFont();
            font.setFontName(HSSFFont.FONT_ARIAL);//字体
            font.setFontHeightInPoints((short) 16);//字号
            font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);//加粗
            //font.setColor(HSSFColor.BLUE.index);//颜色
               
            HSSFCellStyle cellStyle= workbook.createCellStyle(); //设置单元格样式
            cellStyle.setFillForegroundColor(HSSFColor.PALE_BLUE.index);
            cellStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
            cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER );
            cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
            cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
            cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
            cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
            cellStyle.setFont(font);
               
            //产生表格标题行      
            row = sheet.createRow(0);
            row.setHeightInPoints(20);
            for (int i = 0; i < headers.size(); i++) {
                HSSFRichTextString text = new HSSFRichTextString(headers.get(i).toString()); 
                cell = row.createCell(i);
                cell.setCellValue(text);
                cell.setCellStyle(cellStyle);
            
               
               
            cellStyle= workbook.createCellStyle();
            cellStyle.setAlignment(HSSFCellStyle.ALIGN_LEFT);
            cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
            cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
            cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
            cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
            cellStyle.setDataFormat((short)0x31);//设置显示格式,避免点击后变成科学计数法了
            //cellStyle.setWrapText(true);//设置自动换行
            Map map;
            //遍历集合数据,产生数据行 
            for (int i=0; i <datas.size(); i++) {
                row=sheet.createRow((i+1));
                row.setHeightInPoints(20);
                map = datas.get(i);
   
                for(int j=0;j<map.size();j++) {
                     cell = row.createCell(j);
                     cell.setCellStyle(cellStyle);
   
                     cell.setCellType(HSSFCell.CELL_TYPE_STRING);
                     if(map.get(j) != null) {
                         cell.setCellValue(new HSSFRichTextString(map.get(j).toString()));
                     }else{
                         cell.setCellValue(new HSSFRichTextString(""));    
                    }
                }
            }  
               
            for (int i = 0; i < headers.size(); i++) {
                sheet.autoSizeColumn((short)i);
            }
              
            rs.reset();
            rs.setContentType("multipart/form-data"); //自动识别
            rs.setHeader("Content-Disposition","attachment;filename=data.xls");
            //文件流输出到rs里
            workbook.write(rs.getOutputStream());
            rs.getOutputStream().flush();
            rs.getOutputStream().close();
        } catch (Exception e) { 
            System.out.println("#Error ["+e.getMessage()+"] ");
        }
        System.out.println("["+sheets+"] 创建成功...");
        System.out.println("");
    }  
      
      
    /*
     * 通用的Excel文件创建方法
     *    path:保存路径: C:/xls/统计报表.xls
     *   title:首行标题: 2015年度统计报表
     *  sheets:sheet的tab标签页说明: 15年度报表
     * headers:表头:List存放表头  编号、姓名、备注
     *   datas:数据行:list存放实体数据,map存放具体每一行数据,和headers对应。
     */
    public static void ExpExs(String path,String title,String sheets,List headers,List<Map> datas){
        try {
            if(sheets== null || "".equals(sheets)){ sheets = "sheet"; }
               
            boolean isExist = new File(path).exists();
            if(!isExist){
                HSSFWorkbook workbook = new HSSFWorkbook();
                HSSFSheet sheet = workbook.createSheet(sheets);
                   
                FileOutputStream out = new FileOutputStream(new File(path));
                workbook.write(out);
                out.flush();
                out.close();
            }
            FileInputStream file = new FileInputStream(new File(path));
            HSSFWorkbook workbook = new HSSFWorkbook(file);
               
            HSSFSheet sheet = null;
            if(!isExist){
                sheet = workbook.getSheetAt(0);
            }else{
                if(workbook.getSheet(sheets) == null){
                    sheet = workbook.createSheet(sheets); //+workbook.getNumberOfSheets()
                }else{
                    System.out.println("文件:["+path+"] ["+sheets+"] 已经存在...");
                    System.out.println("");
                    return;
                }
            }
            HSSFRow row;
            HSSFCell cell;
               
            // 设置这些样式
            HSSFFont font = workbook.createFont();
            font.setFontName(HSSFFont.FONT_ARIAL);//字体
            font.setFontHeightInPoints((short) 16);//字号
            font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);//加粗
            //font.setColor(HSSFColor.BLUE.index);//颜色
               
            HSSFCellStyle cellStyle= workbook.createCellStyle(); //设置单元格样式
            cellStyle.setFillForegroundColor(HSSFColor.PALE_BLUE.index);
            cellStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
            cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER );
            cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
            cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
            cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
            cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
            cellStyle.setFont(font);
               
            //产生表格标题行      
            row = sheet.createRow(0);
            row.setHeightInPoints(20);
            for (int i = 0; i < headers.size(); i++) {
                HSSFRichTextString text = new HSSFRichTextString(headers.get(i).toString()); 
                cell = row.createCell(i);
                cell.setCellValue(text);
                cell.setCellStyle(cellStyle);
            
               
               
            cellStyle= workbook.createCellStyle();
            cellStyle.setAlignment(HSSFCellStyle.ALIGN_LEFT);
            cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
            cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
            cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
            cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
            cellStyle.setDataFormat((short)0x31);//设置显示格式,避免点击后变成科学计数法了
            //cellStyle.setWrapText(true);//设置自动换行
            Map map;
            //遍历集合数据,产生数据行 
            for (int i=0; i <datas.size(); i++) {
                row=sheet.createRow((i+1));
                row.setHeightInPoints(20);
                map = datas.get(i);
   
                for(int j=0;j<map.size();j++) {
                     cell = row.createCell(j);
                     cell.setCellStyle(cellStyle);
   
                     cell.setCellType(HSSFCell.CELL_TYPE_STRING);
                     if(map.get(j) != null) {
                         cell.setCellValue(new HSSFRichTextString(map.get(j).toString()));
                     }else{
                         cell.setCellValue(new HSSFRichTextString(""));    
                    }
                }
            }  
               
            for (int i = 0; i < headers.size(); i++) {
                sheet.autoSizeColumn((short)i);
            }
               
            FileOutputStream out = new FileOutputStream(new File(path));
            workbook.write(out);
            out.flush();
            out.close();
               
            /*
            HSSFRow row = sheet.createRow(sheets);
            HSSFCell cell = null;
            cell=row.createCell(sheets);
            cell.setCellValue(new HSSFRichTextString("-["+sheets+"]-"));
            sheets=sheets+2;//中间空一行
            row=sheet.createRow(sheets);
            */
               
        } catch (Exception e) { 
            System.out.println("#Error ["+e.getMessage()+"] ");
        }
        System.out.println("文件:["+path+"] ["+sheets+"] 创建成功...");
        System.out.println("");
    }
}