java簡單的導出Excel文件

特色 列出List中要導入到Excel的列名#中文名，而後就完事了。具體的看看main()你就知道有多簡單了。

利用POI，本工具類能夠實現Excel導出和下載，話很少說，放碼過來。 

 

package com.fantong.ois.wms.utils;

import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 導出或下載Excel，
 * Title: ExportXls<br>
 * Description: 用#分割列與轉義標題 ；標題包含*表示須要過濾該列<br>
 * @author xiaour@github.com
 * @createDate 2016年5月31日
 * @version v1.0
 */
public class ExportXls {
	
	private OutputStream out;//傳入OutputStream表示寫入到服務器，傳入HttpServletResponse則直接下載
	
	private static String tag="#";//標題與字段分割符
	private static String hidden="*";//隱藏標識符

	   public ExportXls(OutputStream out) {
		super();
		this.out = out;
	}

	/**
	    * 
	    *@category
	 *@throws IOException
	    *@createDate 2016年5月31日
	 * @param sheetName
	 * @param titles 字段名#中文列名
	 * @param list
	 * */
	   @SuppressWarnings({"deprecation" })
	   public void exportExcel(String sheetName, String[] titles, List<Map<String, Object>> list) throws IOException {
	      // 聲明一個工做薄
	      @SuppressWarnings("resource")
		HSSFWorkbook workbook = new HSSFWorkbook();
	      // 生成一個表格
	      HSSFSheet sheet = workbook.createSheet(sheetName);
	      // 設置表格默認列寬度爲15個字節
	      sheet.setDefaultColumnWidth((short) 20);
	      // 生成一個樣式
	      HSSFCellStyle style = workbook.createCellStyle();
	      // 設置這些樣式
	      style.setFillForegroundColor(HSSFColor.TEAL.index);
	      style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
	      style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
	      style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
	      style.setBorderRight(HSSFCellStyle.BORDER_THIN);
	      style.setBorderTop(HSSFCellStyle.BORDER_THIN);
	      style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
	      // 生成一個字體
	      HSSFFont font = workbook.createFont();
	      font.setColor(HSSFColor.WHITE.index);
	      font.setFontHeightInPoints((short) 14);
	      font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
	      // 把字體應用到當前的樣式
	      style.setFont(font);
	      //產生表格標題行
	      HSSFRow row = sheet.createRow(0);
	      sheet.createFreezePane( 0, 1, 0, 1 );  
	      for (int i = 0; i < titles.length; i++) {
	    	  if(titles[i].indexOf(hidden)<0){
		         HSSFCell cell = row.createCell(i);
		         cell.setCellStyle(style);
		         HSSFRichTextString text=null;
		         if(titles[i].indexOf(tag)>0){
			         text = new HSSFRichTextString(titles[i].split(tag)[1]);
		         }else {
		        	 text = new HSSFRichTextString(titles[i]);
		         }
		         cell.setCellValue(text);
	    	  }
	      }
	      	String value="";
         for(int j=1;j<list.size()+1;j++){
        	 Map<String, Object> map=list.get(j-1);
        	 row = sheet.createRow(j);
		     for(int s=0;s<titles.length;s++){
		    	 if(titles[s].indexOf(hidden)<0){
			         HSSFCell txtCell = row.createCell(s);
			         if(map!=null){
			        	 Object obj=null;

			        	 if(titles[s].indexOf(tag)>0){
				        	 obj=map.get(titles[s].split(tag)[0]);
				         }else {
				        	 obj=map.get(titles[s]);
				         }
			        	 String temp=obj!=null?obj.toString():"";
			        	 value= temp.toString();
			         }
			         HSSFRichTextString text2 = new HSSFRichTextString(value);
			         txtCell.setCellValue(text2);
		    	}
		     }
         }


		 workbook.write(out);
		 out.flush();
		 out.close();

	   }

	   public static void main(String[] args) throws Exception {

	   		//寫入本地
		   OutputStream out = new FileOutputStream("d://1432026362899.xls");
		   ExportXls ex = new ExportXls(out);
		   String [] headers={"A#標題1","B#標題2","C#標題3*"};

	      	List<Map<String,Object>> dataList= new ArrayList<Map<String,Object>>();
	      		for(int j=0;j<headers.length;j++){
	      			Map<String,Object> map= new HashMap<String,Object>();
	      			map.put("A",j+1);
	      			map.put("B",new BigDecimal("580.63"));
	      			map.put("C",null);
	      			dataList.add(map);
	      		}
	      		
	         ex.exportExcel("TEST",headers,dataList);
	         out.close();
	         System.out.println("excel導出成功！");

	   }
		   
}

上面有測試類能夠直接導出到本地，下面看看怎麼直接打開鏈接就下載吧！

@ResponseBody
    @RequestMapping(value = "/download", method = { RequestMethod.GET, RequestMethod.POST })
    public void download(HttpServletResponse response){
        try {

				response.setContentType("application/x-msdownload");

				response.setHeader("Content-Disposition", "attachment; filename='xiaour@github.com.xls'");

				response.setCharacterEncoding("utf-8");

				//能夠將output輸出到服務器
				OutputStream outputStream=response.getOutputStream();

				ExportXls ex = new ExportXls(outputStream);

				String [] headers={"id#編號","name#名稱","operation_time#最近更新時間"};

				ex.exportExcel("報表",headers,dataList);

			}

        } catch (Exception e) {
            logger.error(e);
        }
    }