poi导出excel

/**
 * 测试类
 */
public class Test3 {
    @Test
	public void Test(HttpServletResponse response){
		//list为查询出的集合数据 这个查询方法省略.........
		JSONArray jsonArray = new JSONArray().fluentAddAll(List);
		
        String title = "测试表";

        ServletOutputStream os=response.getOutputStream();
        
        //title :导出excel的名称
        //InformationUtil.getHeadMap() :导出excel的所有标题头部信息
        //jsonArray:查询出的所有数据集合
        //null：在exportExcel方法中，传null值默认 年月日
        //0：在exportExcel方法中，列宽 默认 至少17个字节
        //os 输出流
        
        ExcelTool.exportExcel(title,InformationUtil.getHeadMap(),jsonArray,null,0,os);
        try {
			os.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}


/**
 * 导出Excel 2007 OOXML (.xlsx)格式的工具类
 * @param title 标题行
 * @param headMap 属性-列头
 * @param jsonArray 数据集
 * @param datePattern 日期格式，传null值则默认 年月日
 * @param colWidth 列宽 默认 至少17个字节
 * @param out 输出流
 */
 import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;

import org.apache.poi.hpsf.SummaryInformation;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFComment;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
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.ss.formula.functions.T;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.streaming.SXSSFCell;
import org.apache.poi.xssf.streaming.SXSSFRow;
import org.apache.poi.xssf.streaming.SXSSFSheet;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
public class ExcelTool{

	public static String NO_DEFINE = "no_define";//未定义的字段
	public static String DEFAULT_DATE_PATTERN="yyyy年MM月dd日";//默认日期格式
	public static int DEFAULT_COLOUMN_WIDTH = 17;
	
	
	//导出excel方法
	public static void exportExcel(String title,Map
   
     headMap,JSONArray jsonArray,String datePattern,int colWidth, OutputStream out) {
        if(datePattern==null) datePattern = DEFAULT_DATE_PATTERN;
        // 声明一个工作薄
        SXSSFWorkbook workbook = new SXSSFWorkbook(1000);//缓存
        workbook.setCompressTempFiles(true);
         //表头样式
        CellStyle titleStyle = workbook.createCellStyle();
        titleStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        Font titleFont = workbook.createFont();
        titleFont.setFontHeightInPoints((short) 20);
        titleFont.setBoldweight((short) 700);
        titleStyle.setFont(titleFont);
        // 列头样式
        CellStyle headerStyle = workbook.createCellStyle();
        headerStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
        headerStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        headerStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        headerStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
        headerStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
        headerStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        Font headerFont = workbook.createFont();
        headerFont.setFontHeightInPoints((short) 12);
        headerFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        headerStyle.setFont(headerFont);
        // 单元格样式
        CellStyle cellStyle = workbook.createCellStyle();
        cellStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
        cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
        cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
        cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
        Font cellFont = workbook.createFont();
        cellFont.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
        cellStyle.setFont(cellFont);
        // 生成一个(带标题)表格
        SXSSFSheet sheet = workbook.createSheet();
        //设置列宽
        int minBytes = colWidth
    
      iter = headMap.keySet().iterator(); iter
                .hasNext();) {
            String fieldName = iter.next();

            properties[ii] = fieldName;
            headers[ii] = headMap.get(fieldName);

            int bytes = fieldName.getBytes().length;
            arrColWidth[ii] =  bytes < minBytes ? minBytes : bytes;
            sheet.setColumnWidth(ii,arrColWidth[ii]*256);
            ii++;
        }
        // 遍历集合数据，产生数据行
        int rowIndex = 0;
        for (Object obj : jsonArray) {
            if(rowIndex == 1048576 || rowIndex == 0){
                if ( rowIndex != 0 ) sheet = workbook.createSheet();//如果数据超过了，则在第二页显示

                SXSSFRow titleRow = sheet.createRow(0);//表头 rowIndex=0
                titleRow.createCell(0).setCellValue(title);
                titleRow.getCell(0).setCellStyle(titleStyle);
                sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, headMap.size() - 1));

                SXSSFRow headerRow = sheet.createRow(1); //列头 rowIndex =1
                for(int i=0;i
     
       getHeadMap() {
		Map
      
        headMap = new LinkedHashMap
       
        (); headMap.put("id", "id"); headMap.put("title1", "标题1"); headMap.put("title2", "标题2"); headMap.put("title3", "标题3"); headMap.put("title4", "标题4"); headMap.put("title5", "标题5"); return headMap; } }