解决JAVA导出大数据的EXCEL文件

 

     在工作中遇到了要导出30多万条数据的excel文件，写了一个工具类，我用的是POI3.13版本的，至少版本也得是3.8，否则不支持导出大数据。如下：

import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.poi.hssf.usermodel.HSSFDataFormat;
import org.apache.poi.openxml4j.util.ZipSecureFile;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFCell;

import com.google.common.base.Strings;


public class ExcelUtil {
	
	private  FileOutputStream output;
	private Sheet sheet;
	private SXSSFWorkbook wb;
	private Integer countRow=0;
	private MapobjPropertyMap;
	/**
	 * 初始化
	 * @param xls_write_Address
	 * @param fieldNames
	 * @throws FileNotFoundException
	 */
	public void init_Excel( String path,String fileName,String[] fieldNames) throws FileNotFoundException{
		
		File pathfile=new File(path);
		if(!pathfile.exists()){
			pathfile.mkdirs();
		}
		
		
        output = new FileOutputStream(new File(path+fileName));  //读取的文件路径   
        wb = new SXSSFWorkbook(1000);//内存中保留 10000 条数据，以免内存溢出，其余写入 硬盘      
        sheet = wb.createSheet(String.valueOf("sheet"));  
        wb.setSheetName(0, "sheet");   
        sheet.autoSizeColumn(1);
        Row row = sheet.createRow(countRow++); 
        for(int i=0;i datalist,String[] dataFields) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, IOException, IntrospectionException{
		write_data_Excel(datalist,dataFields,null,null);
	}
	
	public void write_data_Excel(List