使用jxls2.X导出excel文件

使用 jxls2.X 导出excel文件

jxls是基于POI API的Excel报表生成工具，可以更简单、灵活的生成我们想要的Excel格式。我们只需要准备写好格式的Excel文件，在文件需要填充内容的位置加上jxls指令，然后就可以导出我们最终想要的Excel。

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1 2	注意：这里讲的是jxls2，不是jxls1。jxls2不再使用<jx:xx>标签，改为在批注中写指令，这样模版看起来更简洁。 </jx:xx>

jxls2 api首页：http://jxls.sourceforge.net/index.html
jxls2更多的介绍请看官网和自行搜索，小弟不擅长写这些东东，请多多谅解。

下面看例子：
Excel模版文件

所有批注

最终导出Excel文件效果

下面是项目案例
项目结构如下

下面是java代码
Demo.java

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public class Demo {     static byte[] imgBytes;     static{         try {             InputStream ins = new FileInputStream(Demo.class.getClassLoader().getResource("img/img.jpg").getFile());             imgBytes = IOUtils.toByteArray(ins);             ins.close();         } catch (IOException e) {             e.printStackTrace();         }     }     public static void main(String[] args) throws FileNotFoundException, IOException {         HashMap<string, object=""> beans = new HashMap<string, object="">();         beans.put("title", "这是标题");         beans.put("list", getList());         beans.put("logoImg", imgBytes);         beans.put("startTime", new Date());         beans.put("endTime", new Date());         beans.put("exportTime", new Date());         beans.put("url", "http://www.baidu.com");         beans.put("company", "LK_King");         File template = JxlsUtil.getTemplate("demo.xlsx");         File out = new File("D:/out.xlsx");         JxlsUtil.exportExcel(template, out, beans);         System.out.println("导出成功");     }       static List<user> getList(){         List<user> list = new ArrayList<user>();         User zs = new User("张三");         User ls = new User("李四");         User ww = new User("王五");         for (int i = 1; i <= 3; i++) {             zs.getClients().add(new User("客户"+i, true, imgBytes));         }         for (int i = 1; i <= 2; i++) {             ww.getClients().add(new User("客户"+i, false, null));         }         list.add(zs);         list.add(ls);         list.add(ww);         return list;     } }</user></user></user></string,></string,>

User.java

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public class User {     private String name;     private boolean sign;     private byte[] imgBytes;     private List<user> clients = new ArrayList<user>();       public User(String name) {         super();         this.name = name;     }       public User(String name, boolean sign, byte[] imgBytes) {         super();         this.name = name;         this.sign = sign;         this.imgBytes = imgBytes;     }       public String getName() {         return name;     }     public void setName(String name) {         this.name = name;     }     public boolean getSign() {         return sign;     }     public void setSign(boolean sign) {         this.sign = sign;     }     public byte[] getImgBytes() {         return imgBytes;     }     public void setImgBytes(byte[] imgBytes) {         this.imgBytes = imgBytes;     }       public List<user> getClients() {         return clients;     }       public void setClients(List<user> clients) {         this.clients = clients;     } }</user></user></user></user>

JxlsUtil.java

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public class JxlsUtil {     static{         //添加自定义指令（可覆盖jxls原指令）         XlsCommentAreaBuilder.addCommandMapping("image", ImageCommand.class);         XlsCommentAreaBuilder.addCommandMapping("each", EachCommand.class);         XlsCommentAreaBuilder.addCommandMapping("merge", MergeCommand.class);         XlsCommentAreaBuilder.addCommandMapping("link", LinkCommand.class);     }     /** jxls模版文件目录 */     private final static String TEMPLATE_PATH = "jxlsTemplate";     /**      * 导出excel      * @param is - excel文件流      * @param os - 生成模版输出流      * @param beans - 模版中填充的数据      * @throws IOException      */     public static void exportExcel(InputStream is, OutputStream os, Map<string, object=""> beans) throws IOException {         Context context = new Context();         if (beans != null) {             for (String key : beans.keySet()) {                 context.putVar(key, beans.get(key));             }         }         JxlsHelper jxlsHelper = JxlsHelper.getInstance();         Transformer transformer  = jxlsHelper.createTransformer(is, os);         JexlExpressionEvaluator evaluator = (JexlExpressionEvaluator)transformer.getTransformationConfig().getExpressionEvaluator();         Map<string, object=""> funcs = new HashMap<string, object="">();         funcs.put("jx", new JxlsUtil());    //添加自定义功能         evaluator.getJexlEngine().setFunctions(funcs);         jxlsHelper.processTemplate(context, transformer);     }       /**      * 导出excel      * @param xlsPath excel文件      * @param outPath 输出文件      * @param beans 模版中填充的数据      * @throws IOException      * @throws FileNotFoundException      */     public static void exportExcel(String xlsPath, String outPath, Map<string, object=""> beans) throws FileNotFoundException, IOException {             exportExcel(new FileInputStream(xlsPath), new FileOutputStream(outPath), beans);     }       /**      * 导出excel      * @param xls excel文件      * @param out 输出文件      * @param beans 模版中填充的数据      * @throws IOException      * @throws FileNotFoundException      */     public static void exportExcel(File xls, File out, Map<string, object=""> beans) throws FileNotFoundException, IOException {             exportExcel(new FileInputStream(xls), new FileOutputStream(out), beans);     }     /**      * 获取jxls模版文件      */     public static File getTemplate(String name){         String templatePath = JxlsUtil.class.getClassLoader().getResource(TEMPLATE_PATH).getPath();         File template = new File(templatePath, name);         if(template.exists()){             return template;         }         return null;     }       // 日期格式化     public String dateFmt(Date date, String fmt) {         if (date == null) {             return null;         }         try {             SimpleDateFormat dateFmt = new SimpleDateFormat(fmt);             return dateFmt.format(date);         } catch (Exception e) {             e.printStackTrace();         }         return null;     }       // 返回第一个不为空的对象     public Object defaultIfNull(Object... objs) {         for (Object o : objs) {             if (o != null)                 return o;         }         return null;     }       // if判断     public Object ifelse(boolean b, Object o1, Object o2) {         return b ? o1 : o2;     } }</string,></string,></string,></string,></string,>

EachCommand.java

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/**  * 扩展jxls each命令  * 增加retainEmpty属性，当items为null或size为0时，也保留当前一行数据的格式  * 循环增加下标变量“var_index”。如var="item"，获取下标方法：${item_index}  */ public class EachCommand extends AbstractCommand {     public enum Direction {RIGHT, DOWN}       private String var;     private String items;     private String select;     private Area area;     private Direction direction = Direction.DOWN;     private CellRefGenerator cellRefGenerator;     private String multisheet;       private String retainEmpty; //当集合大小为0时，是否最少保留一行空行数据       public EachCommand() {     }       /**      * @param var       name of the key in the context to contain each collection items during iteration      * @param items     name of the collection bean in the context      * @param direction defines processing by rows (DOWN - default) or columns (RIGHT)      */     public EachCommand(String var, String items, Direction direction) {         this.var = var;         this.items = items;         this.direction = direction == null ? Direction.DOWN : direction;     }       public EachCommand(String var, String items, Area area) {         this(var, items, area, Direction.DOWN);     }       public EachCommand(String var, String items, Area area, Direction direction) {         this(var, items, direction);         if (area != null) {             this.area = area;             addArea(this.area);         }     }       /**      * @param var              name of the key in the context to contain each collection items during iteration      * @param items            name of the collection bean in the context      * @param area             body area for this command      * @param cellRefGenerator generates target cell ref for each collection item during iteration      */     public EachCommand(String var, String items, Area area, CellRefGenerator cellRefGenerator) {         this(var, items, area, (Direction) null);         this.cellRefGenerator = cellRefGenerator;     }       /**      * Gets iteration directino      *      * @return current direction for iteration      */     public Direction getDirection() {         return direction;     }       /**      * Sets iteration direction      *      * @param direction      */     public void setDirection(Direction direction) {         this.direction = direction;     }       public void setDirection(String direction) {         this.direction = Direction.valueOf(direction);     }       /**      * Gets defined cell ref generator      *      * @return current {@link CellRefGenerator} instance or null      */     public CellRefGenerator getCellRefGenerator() {         return cellRefGenerator;     }       public void setCellRefGenerator(CellRefGenerator cellRefGenerator) {         this.cellRefGenerator = cellRefGenerator;     }       public String getName() {         return "each";     }       /**      * Gets current variable name for collection item in the context during iteration      *      * @return collection item key name in the context      */     public String getVar() {         return var;     }       /**      * Sets current variable name for collection item in the context during iteration      *      * @param var      */     public void setVar(String var) {         this.var = var;     }       /**      * Gets collection bean name      *      * @return collection bean name in the context      */     public String getItems() {         return items;     }       /**      * Sets collection bean name      *      * @param items collection bean name in the context      */     public void setItems(String items) {         this.items = items;     }       /**      * Gets current 'select' expression for filtering out collection items      *      * @return current 'select' expression or null if undefined      */     public String getSelect() {         return select;     }       /**      * Sets current 'select' expression for filtering collection      *      * @param select filtering expression      */     public void setSelect(String select) {         this.select = select;     }       /**      * @return Context variable name holding a list of Excel sheet names to output the collection to      */     public String getMultisheet() {         return multisheet;     }       /**      * Sets name of context variable holding a list of Excel sheet names to output the collection to      * @param multisheet      */     public void setMultisheet(String multisheet) {         this.multisheet = multisheet;     }       @Override     public Command addArea(Area area) {         if (area == null) {             return this;         }         if (super.getAreaList().size() >= 1) {             throw new IllegalArgumentException("You can add only a single area to 'each' command");         }         this.area = area;         return super.addArea(area);     }       @SuppressWarnings("rawtypes")     public Size applyAt(CellRef cellRef, Context context) {         Collection itemsCollection = Util.transformToCollectionObject(getTransformationConfig().getExpressionEvaluator(), items, context);         int width = 0;         int height = 0;         int index = 0;         CellRefGenerator cellRefGenerator = this.cellRefGenerator;         if (cellRefGenerator == null && multisheet != null) {             List<string> sheetNameList = extractSheetNameList(context);             cellRefGenerator = new SheetNameGenerator(sheetNameList, cellRef);         }         CellRef currentCell = cellRefGenerator != null ? cellRefGenerator.generateCellRef(index, context) : cellRef;         JexlExpressionEvaluator selectEvaluator = null;         if (select != null) {             selectEvaluator = new JexlExpressionEvaluator(select);         }         for (Object obj : itemsCollection) {             context.putVar(var, obj);             context.putVar(var+"_index", index);             if (selectEvaluator != null && !Util.isConditionTrue(selectEvaluator, context)) {                 context.removeVar(var);                 context.removeVar(var+"_index");                 continue;             }             Size size = area.applyAt(currentCell, context);             index++;             if (cellRefGenerator != null) {                 width = Math.max(width, size.getWidth());                 height = Math.max(height, size.getHeight());                 if(index < itemsCollection.size()) {                     currentCell = cellRefGenerator.generateCellRef(index, context);                 }             } else if (direction == Direction.DOWN) {                 currentCell = new CellRef(currentCell.getSheetName(), currentCell.getRow() + size.getHeight(), currentCell.getCol());                 width = Math.max(width, size.getWidth());                 height += size.getHeight();             } else {                 currentCell = new CellRef(currentCell.getSheetName(), currentCell.getRow(), currentCell.getCol() + size.getWidth());                 width += size.getWidth();                 height = Math.max(height, size.getHeight());             }             context.removeVar(var);             context.removeVar(var+"_index");         }         if("true".equalsIgnoreCase(retainEmpty) && width == 0 && height == 0){             return area.applyAt(currentCell, context);         }         return new Size(width, height);     }       @SuppressWarnings("unchecked")     private List<string> extractSheetNameList(Context context) {         try {             return (List<string>) context.getVar(multisheet);         } catch (Exception e) {             throw new JxlsException("Failed to get sheet names from " + multisheet, e);         }     }       public String getRetainEmpty() {         return retainEmpty;     }       public void setRetainEmpty(String retainEmpty) {         this.retainEmpty = retainEmpty;     }   }</string></string></string>

ImageCommand.java

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/**  * 解决图片最少占4个单元格才显示的问题并保留原来单元格样式  */ public class ImageCommand extends AbstractCommand {       private byte[] imageBytes;     private ImageType imageType = ImageType.PNG;     private Area area;     /**      * Expression that can be evaluated to image byte array byte[]      */     private String src;     private String text; //无法读取图片时的提示       public ImageCommand() {     }       public ImageCommand(String image, ImageType imageType) {         this.src = image;         this.imageType = imageType;     }       public ImageCommand(byte[] imageBytes, ImageType imageType) {         this.imageBytes = imageBytes;         this.imageType = imageType;     }       /**      * @return src expression producing image byte array      */     public String getSrc() {         return src;     }       /**      * @param src expression resulting in image byte array      */     public void setSrc(String src) {         this.src = src;     }       public void setImageType(String strType){         imageType = ImageType.valueOf(strType);     }       @Override     public Command addArea(Area area) {         if( super.getAreaList().size() >= 1){             throw new IllegalArgumentException("You can add only a single area to 'image' command");         }         this.area = area;         return super.addArea(area);     }       public String getName() {         return "image";     }       public Size applyAt(CellRef cellRef, Context context) {         if( area == null ){             throw new IllegalArgumentException("No area is defined for image command");         }         Transformer transformer = getTransformer();         Size size = area.getSize();         //获取图片显示区域是时候，多加一行和一列，获取完之后再恢复原来大小         size.setWidth(size.getWidth() + 1);         size.setHeight(size.getHeight() + 1);         AreaRef areaRef = new AreaRef(cellRef, size);         size.setWidth(size.getWidth() - 1);         size.setHeight(size.getHeight() - 1);         byte[] imgBytes = imageBytes;         if( src != null ){             Object imgObj = getTransformationConfig().getExpressionEvaluator().evaluate(src, context.toMap());             if(imgObj != null){                 if( !(imgObj instanceof byte[]) ){                     throw new IllegalArgumentException("src value must contain image bytes (byte[])");                 }                 imgBytes = (byte[]) imgObj;             }         }         if(imgBytes != null){             transformer.addImage(areaRef, imgBytes, imageType);         }         area.applyAt(cellRef, context); //恢复原有的样式         if(imgBytes == null && StringUtils.isNotBlank(text)){             PoiTransformer poi = (PoiTransformer)transformer;             Sheet sheet = poi.getWorkbook().getSheet(cellRef.getSheetName());             Row row = sheet.getRow(cellRef.getRow());             if(row != null && row.getCell(cellRef.getCol()) != null){                 row.getCell(cellRef.getCol()).setCellValue(text);             }         }         return size;     }       public String getText() {         return text;     }       public void setText(String text) {         this.text = text;     } }

LinkCommand.java

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/**  * url超链接  */ public class LinkCommand extends AbstractCommand {     private String url;     //url地址（必选）     private String title;   //url显示标题（可选）     private Area area;       @Override     public String getName() {         return "merge";     }       @Override     public Command addArea(Area area) {         if (super.getAreaList().size() >= 1) {             throw new IllegalArgumentException("You can add only a single area to 'link' command");         }         this.area = area;         return super.addArea(area);     }       @Override     public Size applyAt(CellRef cellRef, Context context) {         if(StringUtils.isBlank(url)){             throw new NullPointerException("url不能为空");         }         area.applyAt(cellRef, context);         Transformer transformer = this.getTransformer();         if(transformer instanceof PoiTransformer){             poiLink(cellRef, context, (PoiTransformer)transformer);         }else if(transformer instanceof JexcelTransformer){             jxcelLink(cellRef, context, (JexcelTransformer)transformer);         }         return new Size(1, 1);     }       protected void poiLink(CellRef cellRef, Context context, PoiTransformer transformer){         Object urlObj = getTransformationConfig().getExpressionEvaluator().evaluate(url, context.toMap());         if(urlObj == null)             return;           String url = urlObj.toString();         String title = url;         if(StringUtils.isNotBlank(this.title)){             Object titleObj = getTransformationConfig().getExpressionEvaluator().evaluate(this.title, context.toMap());             if(titleObj != null)                 title = titleObj.toString();         }           Sheet sheet = transformer.getWorkbook().getSheet(cellRef.getSheetName());         Row row = sheet.getRow(cellRef.getRow());         if(row == null){             row = sheet.createRow(cellRef.getRow());         }         Cell cell = row.getCell(cellRef.getCol());         if(cell == null){             cell = row.createCell(cellRef.getCol());         }         cell.setCellType(HSSFCell.CELL_TYPE_FORMULA);         cell.setCellFormula("HYPERLINK(\"" + url+ "\",\"" + title + "\")");         if(!url.equals(title)){             cell.setCellValue(title);         }           CellStyle linkStyle = cell.getCellStyle();         Font cellFont= transformer.getWorkbook().createFont();         cellFont.setUnderline((byte) 1);         cellFont.setColor(HSSFColor.BLUE.index);         linkStyle.setFont(cellFont);     }       protected void jxcelLink(CellRef cellRef, Context context, JexcelTransformer transformer){     }       public String getUrl() {         return url;     }       public void setUrl(String url) {         this.url = url;     }       public String getTitle() {         return title;     }       public void setTitle(String title) {         this.title = title;     }   }

MergeCommand.java

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/**  * @author lk  * 合并单元格命令  */ public class MergeCommand extends AbstractCommand {     private String cols;    //合并的列数     private String rows;    //合并的行数     private Area area;     private CellStyle cellStyle;    //第一个单元格的样式       @Override     public String getName() {         return "merge";     }       @Override     public Command addArea(Area area) {         if (super.getAreaList().size() >= 1) {             throw new IllegalArgumentException("You can add only a single area to 'merge' command");         }         this.area = area;         return super.addArea(area);     }       @Override     public Size applyAt(CellRef cellRef, Context context) {         int rows = 1, cols = 1;         if(StringUtils.isNotBlank(this.rows)){             Object rowsObj = getTransformationConfig().getExpressionEvaluator().evaluate(this.rows, context.toMap());             if(rowsObj != null && NumberUtils.isDigits(rowsObj.toString())){                 rows = NumberUtils.toInt(rowsObj.toString());             }         }         if(StringUtils.isNotBlank(this.cols)){             Object colsObj = getTransformationConfig().getExpressionEvaluator().evaluate(this.cols, context.toMap());             if(colsObj != null && NumberUtils.isDigits(colsObj.toString())){                 cols = NumberUtils.toInt(colsObj.toString());             }         }           if(rows > 1 || cols > 1){             Transformer transformer = this.getTransformer();             if(transformer instanceof PoiTransformer){                 return poiMerge(cellRef, context, (PoiTransformer)transformer, rows, cols);             }else if(transformer instanceof JexcelTransformer){                 return jexcelMerge(cellRef, context, (JexcelTransformer)transformer, rows, cols);             }         }         area.applyAt(cellRef, context);         return new Size(1, 1);     }       protected Size poiMerge(CellRef cellRef, Context context, PoiTransformer transformer, int rows, int cols){         Sheet sheet = transformer.getWorkbook().getSheet(cellRef.getSheetName());         CellRangeAddress region = new CellRangeAddress(                 cellRef.getRow(),                 cellRef.getRow() + rows - 1,                 cellRef.getCol(),                 cellRef.getCol() + cols - 1);         sheet.addMergedRegion(region);           //合并之后单元格样式会丢失，以下操作将合并后的单元格恢复成合并前第一个单元格的样式         area.applyAt(cellRef, context);         if(cellStyle == null){             PoiCellData cellData = (PoiCellData)transformer.getCellData(cellRef);             cellStyle = cellData.getCellStyle();         }         setRegionStyle(cellStyle, region, sheet);         return new Size(cols, rows);     }       protected Size jexcelMerge(CellRef cellRef, Context context, JexcelTransformer transformer, int rows, int cols){         try {             transformer.getWritableWorkbook().getSheet(cellRef.getSheetName())                 .mergeCells(                         cellRef.getRow(),                         cellRef.getCol(),                         cellRef.getRow() + rows - 1 ,                         cellRef.getCol() + cols - 1);             area.applyAt(cellRef, context);         } catch (WriteException e) {             throw new IllegalArgumentException("合并单元格失败");         }         return new Size(cols, rows);     }       private static void setRegionStyle(CellStyle cs, CellRangeAddress region, Sheet sheet) {         for (int i = region.getFirstRow(); i <= region.getLastRow(); i++) {             Row row = sheet.getRow(i);             if (row == null)                 row = sheet.createRow(i);             for (int j = region.getFirstColumn(); j <= region.getLastColumn(); j++) {                 Cell cell = row.getCell(j);                 if (cell == null) {                     cell = row.createCell(j);                 }                 cell.setCellStyle(cs);             }         }     }       public String getCols() {         return cols;     }       public void setCols(String cols) {         this.cols = cols;     }       public String getRows() {         return rows;     }       public void setRows(String rows) {         this.rows = rows;     } }

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