在Java中封装导出Excel数据的总体思路为:
1.导出，根据查询得到的数据（一般我们页面上用的是查询条件带分页的），我们需要把查询条件带到后台重新查询，并且是查询全部数据，不带分页
2.不能用ajax异步提交。应该用location.href=""的方式，把处理的流交给浏览器来处理，JS无法处理流计算。
3.封装统一的Bean实体，主要输入导出的列名，excel名，数据集即可导出。
用到的Maven地址：
<!-- poi -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.13</version>
</dependency>
<dependency>
<groupId>jexcelapi</groupId>
<artifactId>jxl</artifactId>
<version>2.6</version>
</dependency>
ExcelBean：
public class ExcelBean { private String name; private String sheetName; private ExcelTitle[] titles; private List<String[]> dataList; private boolean headBold = true; /** * 列宽 （像素） */ private int columnWidth = 200; private int rowHeight; public ExcelBean(String name, String sheetName, ExcelTitle[] titles){ this.name = name; this.sheetName = sheetName; this.titles = titles; this.dataList = new ArrayList<String[]>(); }
public String getName() { return name; }
public void setName(String name) { this.name = name; }
public String getSheetName() { return sheetName; }
public void setSheetName(String sheetName) { this.sheetName = sheetName; }
public ExcelTitle[] getTitles() { return titles; }
public void setTitles(ExcelTitle[] titles) { this.titles = titles; }
public List<String[]> getDataList() { return dataList; }
public void setDataList(List<String[]> dataList) { this.dataList = dataList; } public boolean isHeadBold() { return headBold; }
public void setHeadBold(boolean headBold) { this.headBold = headBold; }
public int getColumnWidth() { return columnWidth; }
public void setColumnWidth(int columnWidth) { this.columnWidth = columnWidth; }
public int getRowHeight() { return rowHeight; }
public void setRowHeight(int rowHeight) { this.rowHeight = rowHeight; }
public void add(String[] data){ this.dataList.add(data); }
}
ExcelBox：
/** * excel 块状区域 * @author * */public class ExcelBox { private int x1; private int y1; private int x2; private int y2; public ExcelBox(int width, int height, int colWidth, int rowHeight, int padding){ double ratio = 1; int innerWidth = colWidth - 2 * padding; int innerHeight = rowHeight - 2 * padding; if((double) width / height > (double) innerWidth/ innerHeight){ if(width > innerWidth){ ratio = (double) innerWidth / width; } } else{ if(height > innerHeight){ ratio = (double) innerHeight / height; } } int boxWidth = (int)(width * ratio); int boxHeight = (int)(height * ratio); x1 = (colWidth - boxWidth) / 2; y1 = (rowHeight - boxHeight) / 2; x2 = x1 + boxWidth; y2 = y1+ boxHeight; }
public int getX1() { return x1; }
public void setX1(int x1) { this.x1 = x1; }
public int getY1() { return y1; }
public void setY1(int y1) { this.y1 = y1; }
public int getX2() { return x2; }
public void setX2(int x2) { this.x2 = x2; }
public int getY2() { return y2; }
public void setY2(int y2) { this.y2 = y2; }}
ExcelImage：
/**
* excel 图片
* @
*
*/
public class ExcelImage {
private int width;
private int height;
private byte[] byteArray;
public ExcelImage(String imageUrl) throws IOException{
BufferedImage bufferedImage = ImageIO.read(new URL(imageUrl));
ByteArrayOutputStream byteArrayOutputStream =new ByteArrayOutputStream();
ImageIO.write(bufferedImage,"png", byteArrayOutputStream);
width = bufferedImage.getWidth();
height = bufferedImage.getHeight();
byteArray = byteArrayOutputStream.toByteArray();
byteArrayOutputStream.close();
}
public int getWidth() {
return width;
}
public void setWidth(int width) {
this.width = width;
}
public int getHeight() {
return height;
}
public void setHeight(int height) {
this.height = height;
}
public byte[] getByteArray() {
return byteArray;
}
public void setByteArray(byte[] byteArray) {
this.byteArray = byteArray;
}
}
ExcelTitle：
/**
* Excel Title
* @author
*
*/
public class ExcelTitle {
private String value;
/**
* 列宽（像素）
*/
private int width;
public static ExcelTitle generate(String value, int width){
ExcelTitle title = new ExcelTitle();
title.setValue(value);
title.setWidth(width);
return title;
}
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
public int getWidth() {
return width;
}
public void setWidth(int width) {
this.width = width;
}
}
工具类 ExcelUtils：
package com.goldensky.common.excelutil;
import java.io.ByteArrayOutputStream;import java.io.OutputStream;import java.util.regex.Pattern;
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.HSSFClientAnchor;import org.apache.poi.hssf.usermodel.HSSFFont;import org.apache.poi.hssf.usermodel.HSSFPatriarch;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;
public class excelExport { /*@SuppressWarnings("resource") public static void export( ExcelBean excelBean, HttpServletResponse response) throws Exception{ HSSFWorkbook wb = new HSSFWorkbook(); HSSFSheet sheet = wb.createSheet(excelBean.getSheetName()); HSSFRow row = sheet.createRow(0); //设置样式 HSSFCellStyle style = wb.createCellStyle(); if(excelBean.isHeadBold()){ HSSFFont headfont = wb.createFont(); headfont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); style.setAlignment(HSSFCellStyle.ALIGN_CENTER); style.setFont(headfont); } HSSFCell cell; ExcelTitle[] titles = excelBean.getTitles(); for(int i=0; i < titles.length; i++){ ExcelTitle title = titles[i]; cell= row.createCell(i); cell.setCellValue(title.getValue()); cell.setCellStyle(style); int columnWidth = title.getWidth() > 0 ? title.getWidth() : excelBean.getColumnWidth(); sheet.setColumnWidth(i, getColWidth(columnWidth)); } int rowNumber = 1; int rowHeihgt = excelBean.getRowHeight(); HSSFPatriarch patriarch = sheet.createDrawingPatriarch(); for(String[] data : excelBean.getDataList()){ row = sheet.createRow(rowNumber ++ ); if(rowHeihgt > 0){ row.setHeight((short) getRowHeight(rowHeihgt)); } else{ rowHeihgt = 18; } for(int j=0; j<data.length; j ++){ String value = data[j]; cell = row.createCell(j); if(isUrl(value)){ if(isImage(value)){ int columnWidth = titles[j].getWidth() > 0 ? titles[j].getWidth() : excelBean.getColumnWidth(); ExcelImage excelImage = new ExcelImage(value); ExcelBox excelBox = new ExcelBox(excelImage.getWidth(), excelImage.getHeight(), rowHeihgt, columnWidth, 10); HSSFClientAnchor anchor = new HSSFClientAnchor(); int cw = getColWidth(columnWidth); int rh = getRowHeight(rowHeihgt); short col = (short)(j); int rowNum = rowNumber-1; anchor.setDx1(getAnchorX(excelBox.getX1(), cw)); anchor.setDy1(getAnchorY(excelBox.getY1(), rh)); anchor.setDx2(getAnchorX(excelBox.getX2(), cw)); anchor.setDy2(getAnchorY(excelBox.getY2(), rh)); anchor.setCol1(col); anchor.setRow1(rowNum); anchor.setCol2(col); anchor.setRow2(rowNum); anchor.setAnchorType(0); patriarch.createPicture(anchor , wb.addPicture(excelImage.getByteArray(), HSSFWorkbook.PICTURE_TYPE_JPEG)); } else{ cell.setCellValue(value); cell.setCellFormula("HYPERLINK(\"" + value + "\",\"" + value + "\")"); HSSFCellStyle linkStyle = wb.createCellStyle(); HSSFFont cellFont= wb.createFont(); cellFont.setUnderline((byte) 1); cellFont.setColor(HSSFColor.BLUE.index); linkStyle.setFont(cellFont); linkStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); cell.setCellStyle(linkStyle); } } else{ cell.setCellValue(value); HSSFCellStyle cellStyle = wb.createCellStyle(); cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); cell.setCellStyle(cellStyle); } } } response.setContentType("application/octet-stream;charset=utf-8"); response.setCharacterEncoding("utf-8"); String filename = excelBean.getName(); filename = new String(filename.replaceAll("\\s|;", "").getBytes("gbk"), "ISO8859-1"); response.setContentType("application/vnd.ms-excel"); response.setHeader("Content-disposition", "attachment;filename=" + filename); OutputStream ouputStream = response.getOutputStream(); wb.write(ouputStream); ouputStream.flush(); ouputStream.close(); }*/ @SuppressWarnings("resource") public static void export( ExcelBean excelBean, HttpServletResponse response) throws Exception{ HSSFWorkbook wb = new HSSFWorkbook(); HSSFSheet sheet = wb.createSheet(excelBean.getSheetName()); HSSFRow row = sheet.createRow(0); //设置样式 HSSFCellStyle style = wb.createCellStyle(); if(excelBean.isHeadBold()){ HSSFFont headfont = wb.createFont(); headfont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); style.setAlignment(HSSFCellStyle.ALIGN_CENTER); style.setFont(headfont); } HSSFCell cell; ExcelTitle[] titles = excelBean.getTitles(); for(int i=0; i < titles.length; i++){ ExcelTitle title = titles[i]; cell= row.createCell(i); cell.setCellValue(title.getValue()); cell.setCellStyle(style); int columnWidth = title.getWidth() > 0 ? title.getWidth() : excelBean.getColumnWidth(); sheet.setColumnWidth(i, getColWidth(columnWidth)); } int rowNumber = 1; int rowHeihgt = excelBean.getRowHeight(); HSSFPatriarch patriarch = sheet.createDrawingPatriarch(); for(String[] data : excelBean.getDataList()){ row = sheet.createRow(rowNumber ++ ); if(rowHeihgt > 0){ row.setHeight((short) getRowHeight(rowHeihgt)); } else{ rowHeihgt = 18; } for(int j=0; j<data.length; j ++){ String value = data[j]; cell = row.createCell(j); if(isUrl(value)){ if(isImage(value)){ int columnWidth = titles[j].getWidth() > 0 ? titles[j].getWidth() : excelBean.getColumnWidth(); ExcelImage excelImage = new ExcelImage(value); ExcelBox excelBox = new ExcelBox(excelImage.getWidth(), excelImage.getHeight(), rowHeihgt, columnWidth, 10); HSSFClientAnchor anchor = new HSSFClientAnchor(); int cw = getColWidth(columnWidth); int rh = getRowHeight(rowHeihgt); short col = (short)(j); int rowNum = rowNumber-1; anchor.setDx1(getAnchorX(excelBox.getX1(), cw)); anchor.setDy1(getAnchorY(excelBox.getY1(), rh)); anchor.setDx2(getAnchorX(excelBox.getX2(), cw)); anchor.setDy2(getAnchorY(excelBox.getY2(), rh)); anchor.setCol1(col); anchor.setRow1(rowNum); anchor.setCol2(col); anchor.setRow2(rowNum); anchor.setAnchorType(0); patriarch.createPicture(anchor , wb.addPicture(excelImage.getByteArray(), HSSFWorkbook.PICTURE_TYPE_JPEG)); } else{ cell.setCellValue(value); cell.setCellFormula("HYPERLINK(\"" + value + "\",\"" + value + "\")"); HSSFCellStyle linkStyle = wb.createCellStyle(); HSSFFont cellFont= wb.createFont(); cellFont.setUnderline((byte) 1); cellFont.setColor(HSSFColor.BLUE.index); linkStyle.setFont(cellFont); linkStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); cell.setCellStyle(linkStyle); } } else{ cell.setCellValue(value); HSSFCellStyle cellStyle = wb.createCellStyle(); cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); cell.setCellStyle(cellStyle); } } } response.setContentType("application/octet-stream;charset=utf-8"); response.setCharacterEncoding("utf-8"); String filename = excelBean.getName(); filename = new String(filename.replaceAll("\\s|;", "").getBytes("gbk"), "ISO8859-1"); response.setContentType("application/vnd.ms-excel"); response.setHeader("Content-disposition", "attachment;filename=" + filename); ByteArrayOutputStream out = new ByteArrayOutputStream(); wb.write(out); byte[] ret = out.toByteArray(); out.flush(); out.close(); FileUpDown file = new FileUpDown(); file.download(filename, ret, response); } /** * 获取图片x方向长度坐标转换 * @param px * @param colWidth * @return */ public static int getAnchorX(int px, int colWidth){ return (int) Math.round(( (double) 701 * 16000.0 / 301)*((double)1/colWidth)*px); } /** * 获取图片y方向长度坐标转换 * @param px * @param rowHeight * @return */ public static int getAnchorY(int px, int rowHeight){ return (int) Math.round(( (double) 144 * 8000 / 301)*((double)1/rowHeight)*px); } /** * 行高转换 * @param px * @return */ public static int getRowHeight( int px ){ return (int) Math.round(((double) 4480 / 300 ) * px); } /** * 列宽转换 * @param px * @return */ public static int getColWidth( int px ){ return (int) Math.round(((double) 10971 / 300 ) * px); } /** * 判断是否为链接地址 */ public static boolean isUrl(String string){ Pattern pattern = Pattern.compile("^((http|https):\\/\\/([\\w\\-]+\\.)+[\\w\\-]+(\\/[\\w\\u4e00-\\u9fa5\\-\\.\\/?\\@\\%\\!\\&=\\+\\~\\:\\#\\;\\,]*)?)", Pattern.CASE_INSENSITIVE ); return pattern.matcher(string).matches(); } /** * 判断是否为图片 */ public static boolean isImage(String string){ Pattern pattern = Pattern.compile("\\S+\\.(jpg|jpeg|png|gif|bmp)(\\?\\S+)?$", Pattern.CASE_INSENSITIVE ); return isUrl(string) && pattern.matcher(string).matches(); }
}
下载类，FileUpDown：
package com.goldensky.common.excelutil;
import java.util.regex.Matcher;import java.util.regex.Pattern;
import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;
import org.apache.poi.ss.usermodel.Cell;import org.apache.poi.ss.usermodel.Sheet;import org.apache.poi.ss.usermodel.Workbook;
public class FileUpDown {
/** * 导出文件，注意：导出后缓存将被删除 * * @param fileName 文件名 * @param buffer 文件内容缓存 * @param response HttpServletResponse对象 * @return 如果出错返回错误信息 */ public static String download(String fileName, byte[] buffer, HttpServletResponse response) { String ret = ""; javax.servlet.ServletOutputStream outputStream = null; try { if (buffer != null && buffer.length > 0) { String strFileName = new String(fileName.getBytes("utf-8"), "utf-8"); response.reset(); response.setContentType("application/x-download"); response.setHeader("Content-Disposition", "attachment; filename=\"" + strFileName + "\""); int length = buffer.length; outputStream = response.getOutputStream(); outputStream.write(buffer, 0, length); outputStream.flush(); outputStream.close(); response.setStatus(HttpServletResponse.SC_OK); response.flushBuffer(); } } catch (Exception e) { } finally { buffer = null; } return ret; } /** * 下载数组内容到客户端一文件 */ public static void download(HttpServletResponse response, HttpServletRequest request, byte[] buffer, String strFileName) { try { // strFileName = new String( strFileName.getBytes("Big5"), // "ISO8859_1" )); strFileName = new String(strFileName.getBytes("gb2312"), "iso-8859-1"); response.reset(); response.setContentType("application/x-download"); // if (request.getHeader("User-Agent").indexOf("MSIE 5.5") != -1) { // ... IE5.5不能加上 attachment; response.setHeader("Content-Disposition", "attachment; filename=\"" + strFileName + "\""); int length = buffer.length; ServletOutputStream outputStream = response.getOutputStream(); outputStream.write(buffer, 0, length); outputStream.flush(); outputStream.close(); response.setStatus(HttpServletResponse.SC_OK); response.flushBuffer(); } catch (Exception e) { } }}
调用示例：
前台：
//导出Excel数据
function exportexcel()
{
var drvalue=$("#drstatus").combobox(‘getValue‘);
location.href="${localCtx }/approvaloption/export.do?flowstatus="+drvalue+"&&roleid="+${sysUser.userrole.nRoleId}+"";
}
后台调用：
@RequestMapping(value="export.do")
public void exportExcel(String flowstatus,Long roleid,HttpServletResponse response)
{
Long status=(null!=flowstatus&&!"".equals(flowstatus))?Long.parseLong(flowstatus):null;
List<Flow> list=flowService.getList(roleid,status);
ExcelTitle[] titles = {
ExcelTitle.generate("流程名称", 60),
ExcelTitle.generate("流程描述", 100),
ExcelTitle.generate("流程节点名称", 100),
ExcelTitle.generate("审批人", 100),
ExcelTitle.generate("通行证类型", 100),
ExcelTitle.generate("号牌号码", 100),
ExcelTitle.generate("车辆使用单位", 100),
ExcelTitle.generate("业务类别", 100),
ExcelTitle.generate("审批状态", 100),
};
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
String fileName = format.format(Calendar.getInstance().getTime())+"审核结果.xls";
ExcelBean excelBean = new ExcelBean(fileName, "统计", titles);
for(Flow fl : list){
String flowname=fl.getFd().getFlowName();
String flowdesc=fl.getFd().getFlowDesc();
String nodeName=fl.getFn().getNodeNames();
String spr=fl.getT().getRoleName();
String txzlx=fl.getDic().getDmsm1();
String hphm=fl.getTp().getHphm();
String clsydw=fl.getTp().getClsydw();
String ywlb=(fl.getTp().getYwlb()==1)?"业务申请":"延期";
String splc=(fl.getApproveStatus()==1L)?"未审批":"已审批";
excelBean.add(new String[]{flowname,flowdesc,nodeName,spr,txzlx,hphm,clsydw,ywlb,splc});
}
try {
excelExport.export(excelBean, response);
} catch (Exception e) {
e.printStackTrace();
}
}
时间： 2024-10-18 06:58:47