用jxl模板生成xls文件，并插入图片

近段时间做了个用jxl模板生成xls文件，并在文件中增加图片。具体方法如下

 一.maven配置：

<dependency>
	<groupId>net.sourceforge.jexcelapi</groupId>
	<artifactId>jxl</artifactId>
	<version>2.6.12</version>
</dependency>
		
<dependency>
	<groupId>org.jxls</groupId>
	<artifactId>jxls</artifactId>
	<version>2.2.8</version>
</dependency>
<dependency>
	<groupId>org.jxls</groupId>
	<artifactId>jxls-poi</artifactId>
	<version>1.0.7</version>
</dependency>

二.创建基本类：Employee和EmployeePrintDto和EmployeeRelationPrintDto

public class EmployeePrintDto {
	private String deadlineDay;
	private String money;
	private String name;
	private String gender;
	private String id_0;
	private String id_1;
	private String id_2;
	private String id_3;
	private String id_4;
	private String id_5;
	private String id_6;
	private String id_7;
	private String id_8;
	private String id_9;
	private String id_10;
	private String id_11;
	private String id_12;
	private String id_13;
	private String id_14;
	private String id_15;
	private String id_16;
	private String id_17;
	
	private String phone;
	private String addr;
	private String marryStatus;
	private String company;
	private String comAddr;
	private String position;
	private String hy_account;
	private String com_phone;
	
   private List<EmployeeRelationPrintDto> crs = new ArrayList<EmployeeRelationPrintDto>();
}

public class EmployeeRelationPrintDto {
	private String relation_name;

	private String relation;

	private String relation_pho;
}
public class Employee{
    
    private Long id;
    private String no;
    private String name;
    private Byte gender;
    private String identityCard;
    private String identityAddr;
    private String phone;
    private String marryStatus;
    private String companyName;
    private String companyAddr;
    private String companyPhone;
    private String position;
    private String hyAccount;
    private Byte status;
    private Date joinTime;
    private String positiveTime;
    private String contractType;
    private String bankName;
    private String bankAccount;
    private String email;
}

三.创建生成根据模板文件生成Excel的工具类.JxlExportExcelModelUtils

package com.ftk.eloan.service.export.jxl.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;

import org.jxls.area.Area;
import org.jxls.builder.AreaBuilder;
import org.jxls.builder.xls.XlsCommentAreaBuilder;
import org.jxls.common.CellRef;
import org.jxls.common.Context;
import org.jxls.transform.Transformer;
import org.jxls.util.TransformerFactory;
import org.springframework.stereotype.Component;

import com.ftk.eloan.entity.emp.Employee;
import com.ftk.eloan.service.export.jxl.dto.EmployeePrintDto;
import com.ftk.eloan.service.export.jxl.dto.EmployeeRelationPrintDto;
/**
 * Created by frank on 2016/11/30.
 */
@Component
public class JxlExportExcelModelUtils {


    public static void main(String[] args){
//      @Value("${export.excel.template}")
  	    String template ="D:/pic/model/emp_loan_template.xls";
//      private  String template ="D:/pic/model/pact_template.xls";
//      @Value("${export.excel.output}")
        String output = "D:/pic/jxl/emp";
    	
    	Employee emp = new Employee();
    	emp.setName("zhang san");
    	emp.setGender((byte)1 );
    	emp.setIdentityCard("43020219980128401X");
    	emp.setPhone("18332456897");
    	EmployeePrintDto pactPrintDto = EmpPrintConvertUtils.convertEmployee(emp);    	
    	try {
    		JxlExportExcelModelUtils.execute(pactPrintDto,template,output,"test.xls");
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
    }
    
    @SuppressWarnings("finally")
	public static String execute(EmployeePrintDto pactPrintDto,String template,String outputFolder,String fileName) throws Exception {
        InputStream in = null;
        OutputStream out = null;
        String fileNameTemp = null;
        try{
        	in = new FileInputStream(template);
            String filePath = outputFolder + File.separator + fileName;
            File outputFile = new File(filePath);
            outputFile.delete();
            if (!outputFile.exists()) {
                if (!outputFile.getParentFile().exists()) {
                    outputFile.getParentFile().mkdirs();
                }
                outputFile.createNewFile();
            }
            out = new FileOutputStream(filePath);
            Transformer transformer = TransformerFactory.createTransformer(in, out);
            AreaBuilder areaBuilder = new XlsCommentAreaBuilder(transformer, true);
            List<Area> xlsAreaList = areaBuilder.build();
            Area xlsArea = xlsAreaList.get(0);
            Context pfcContext = transformer.createInitialContext();
            pfcContext.putVar("emp", pactPrintDto);
            pfcContext.putVar("rel", new EmployeeRelationPrintDto());
            xlsArea.applyAt(new CellRef(xlsArea.getAreaRef().getSheetName() + "!A1"), pfcContext);
            xlsArea.processFormulas();
            transformer.write();
            fileNameTemp = fileName;
        }catch(Exception e){
        	e.printStackTrace();        	
        }finally {
        	
        	if(in != null) {
        		in.close();
        	}
        	if(out != null) {
        		out.flush();
                out.close();
        	}
        	
        	return fileNameTemp;
		}
        
        
    }


}

四.创建对已有excel插入图片的工具类JxlExportImgUtils

package com.ftk.eloan.service.export.jxl.util;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.imageio.ImageIO;

import com.ftk.eloan.entity.emp.Employee;
import com.ftk.eloan.service.export.jxl.dto.EmployeePrintDto;

import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;
import jxl.write.WritableImage;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;

public class JxlExportImgUtils {

	// 添加图片需要增加的默认行数
	private static final int DEFAULT_ADD_CELL_SIZE = 20;

	public static void main(String[] args) {
		String template = "D:/pic/model/emp_loan_template.xls";
		String output = "D:/pic/jxl/emp/";

		Employee emp = new Employee();
		emp.setName("zhang san");
		emp.setGender((byte) 1);
		emp.setIdentityCard("43020219980128401X");
		emp.setPhone("18332456897");
		EmployeePrintDto pactPrintDto = EmpPrintConvertUtils.convertEmployee(emp);
		try {
			String fileName = JxlExportExcelModelUtils.execute(pactPrintDto, template, output, "test2.xls");
			File file = new File(output + fileName);
			List<File> pictureFiles = new ArrayList() {
				{
					add(new File("D:/pic/jxl/1.png"));
					add(new File("D:/pic/jxl/2.png"));
				}
			};
			addPicture2Excel(file, 1, pictureFiles, 0, 0);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	@SuppressWarnings("finally")
	public static String  addPicture2Excel(File excelFile, int sheetIndex, List<File> pictureFiles, Integer cellRow,
			Integer cellCol) {
		String fileName = null;
		if (excelFile == null || !excelFile.exists() || pictureFiles == null || pictureFiles.size() <= 0) {
			return fileName;
		}
		
		// 打开文件
		Workbook rdBook = null;
		WritableWorkbook book = null;
		try {
			rdBook = Workbook.getWorkbook(excelFile);

			book = Workbook.createWorkbook(excelFile, rdBook);
			WritableSheet sheet = book.createSheet("身份证图片", 1);
			for (int i = 0; i < pictureFiles.size(); i++) {
				File file = pictureFiles.get(i);
				if (!file.exists() || file.getName().indexOf(".png") < 0) {
					continue;
				}
				try {
					addPictureToExcel(sheet, file, cellRow + i * DEFAULT_ADD_CELL_SIZE, cellCol);
				} catch (Exception e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			
			book.write();
			fileName = excelFile.getName();
		} catch (BiffException | IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally {			
			if(rdBook != null) {
				rdBook.close();
			}
			try {
				if(book != null) {
					book.close();	
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
			return fileName;
		}

	}

	/**
	 * 插入图片到EXCEL
	 * 
	 * @param picSheet
	 *            sheet
	 * @param pictureFile
	 *            图片file对象
	 * @param cellRow
	 *            行数
	 * @param cellCol
	 *            列数
	 * @throws Exception
	 *             例外
	 */
	private static void addPictureToExcel(WritableSheet picSheet, File pictureFile, Integer cellRow, Integer cellCol)
			throws Exception {
		// 开始位置
		double picBeginCol = cellCol.intValue();
		double picBeginRow = cellRow.intValue();
		// 图片时间的高度，宽度
		double picCellWidth = 0.0;
		double picCellHeight = 0.0;
		// 读入图片
		BufferedImage picImage = ImageIO.read(pictureFile);
		// 取得图片的像素高度，宽度
		int picWidth = picImage.getWidth();
		int picHeight = picImage.getHeight();

		// 计算图片的实际宽度
		int picWidth_t = picWidth * 32; // 具体的实验值，原理不清楚。
		for (int x = 0; x < 1234; x++) {
			int bc = (int) Math.floor(picBeginCol + x);
			// 得到单元格的宽度
			int v = picSheet.getColumnView(bc).getSize();
			double offset0_t = 0.0;
			if (0 == x)
				offset0_t = (picBeginCol - bc) * v;
			if (0.0 + offset0_t + picWidth_t > v) {
				// 剩余宽度超过一个单元格的宽度
				double ratio_t = 1.0;
				if (0 == x) {
					ratio_t = (0.0 + v - offset0_t) / v;
				}
				picCellWidth += ratio_t;
				picWidth_t -= (int) (0.0 + v - offset0_t);
			} else { // 剩余宽度不足一个单元格的宽度
				double ratio_r = 0.0;
				if (v != 0)
					ratio_r = (0.0 + picWidth_t) / v;
				picCellWidth += ratio_r;
				break;
			}
		}
		// 计算图片的实际高度
		int picHeight_t = picHeight * 15;
		for (int x = 0; x < 1234; x++) {
			int bc = (int) Math.floor(picBeginRow + x);
			// 得到单元格的高度
			int v = picSheet.getRowView(bc).getSize();
			double offset0_r = 0.0;
			if (0 == x)
				offset0_r = (picBeginRow - bc) * v;
			if (0.0 + offset0_r + picHeight_t > v) {
				// 剩余高度超过一个单元格的高度
				double ratio_q = 1.0;
				if (0 == x)
					ratio_q = (0.0 + v - offset0_r) / v;
				picCellHeight += ratio_q;
				picHeight_t -= (int) (0.0 + v - offset0_r);
			} else {// 剩余高度不足一个单元格的高度
				double ratio_m = 0.0;
				if (v != 0)
					ratio_m = (0.0 + picHeight_t) / v;
				picCellHeight += ratio_m;
				break;
			}
		}
		// 生成一个图片对象。
		WritableImage image = new WritableImage(picBeginCol, picBeginRow, picCellWidth, picCellHeight, pictureFile);
		// 把图片插入到sheet
		picSheet.addImage(image);
	}
}

五.设置模板文件

注意模板中需要在A1和B13处编辑批注。批注如下：

admin:
jx:area(lastCell="AD28")

admin:
jx:each(items="emp.crs",var="rel",lastCell="AD13")

六.注意事项

     jxl只对xls文档操作有效，插入图片只能是png格式的。另外模板需要在excel模板中用批注额外指定域