JAVA实现页面表格数据导出到execl通用方法(POI) (装载)

最近公司项目频繁使用导出报表需求，并且需要封装个公用的方法，并结合XML技术，对不同数据表及标题提取

Java代码

/**

     * 这是一个通用的方法，利用了JAVA的反射机制,

     * 可以将放置在JAVA集合中并且符合一定条件的数据以EXCEL的形式输出到指定IO设备上

     * @param title 表格标题名

     * @param headers 表格属性列名数组

     * @param dataset 需要显示的数据集合,集合中一定要放置符合javabean风格的类的对象。

     * 此方法支持的javabean属性【数据类型有java基本数据类型及String,Date,byte[](图片转成字节码)】

     * @param out 与输出设备关联的流对象，可以将EXCEL文档导出到本地文件或者网络中

     * @param pattern  如果有时间数据，设定输出格式。默认为"yyy-MM-dd"

     */



    @SuppressWarnings("unused")

    static void exportExcel(String title, String[] headers,

            Collection<User> dataset, OutputStream out, String pattern) {

        // 声明一个工作薄

        HSSFWorkbook workbook = new HSSFWorkbook();

        // 生成一个表格

        HSSFSheet sheet = workbook.createSheet(title);

        // 设置表格默认列宽度为15个字节

        sheet.setDefaultColumnWidth((short) 15);

        // 生成一个样式

        HSSFCellStyle style = workbook.createCellStyle();

        // 设置这些样式

        style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);

        style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);

        style.setBorderBottom(HSSFCellStyle.BORDER_THIN);

        style.setBorderLeft(HSSFCellStyle.BORDER_THIN);

        style.setBorderRight(HSSFCellStyle.BORDER_THIN);

        style.setBorderTop(HSSFCellStyle.BORDER_THIN);

        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);

        // 生成一个字体

        HSSFFont font = workbook.createFont();

        font.setColor(HSSFColor.VIOLET.index);

        font.setFontHeightInPoints((short) 12);

        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);

        // 把字体应用到当前的样式

        style.setFont(font);

        // 生成并设置另一个样式

        HSSFCellStyle style2 = workbook.createCellStyle();

        style2.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);

        style2.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);

        style2.setBorderBottom(HSSFCellStyle.BORDER_THIN);

        style2.setBorderLeft(HSSFCellStyle.BORDER_THIN);

        style2.setBorderRight(HSSFCellStyle.BORDER_THIN);

        style2.setBorderTop(HSSFCellStyle.BORDER_THIN);

        style2.setAlignment(HSSFCellStyle.ALIGN_CENTER);

        style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);

        // 生成另一个字体

        HSSFFont font2 = workbook.createFont();

        font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);

        // 把字体应用到当前的样式

        style2.setFont(font2);

        // 声明一个画图的顶级管理器

        HSSFPatriarch patriarch = sheet.createDrawingPatriarch();

        // 定义注释的大小和位置,详见文档

        HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0,

                0, 0, 0, (short) 4, 2, (short) 6, 5));

        // 设置注释内容

        comment.setString(new HSSFRichTextString("注释！"));

        // 设置注释作者，当鼠标移动到单元格上是可以在状态栏中看到该内容.

        comment.setAuthor("ape-tech");

        // 产生表格标题行

        HSSFRow row = sheet.createRow(0);

        for (short i = 0; i < headers.length; i++) {

            HSSFCell cell = row.createCell(i);

            cell.setCellStyle(style);

            HSSFRichTextString text = new HSSFRichTextString(headers[i]);

            cell.setCellValue(text);

        }

        

        // 遍历集合数据，产生数据行

        Iterator<User> it = dataset.iterator();

        int index = 0;

        while (it.hasNext()) {

            index++;

            row = sheet.createRow(index);

            User t = (User) it.next();

            // 利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值

            Field[] fields = t.getClass().getDeclaredFields();

            for (short i = 0; i < fields.length; i++) {

                HSSFCell cell = row.createCell(i);

                cell.setCellStyle(style2);

                Field field = fields[i];

                String fieldName = field.getName();

                //fieldName 属性名 如果对属性需要处理的话.用这个区分***我用性别做处理吧 

                //

                String getMethodName = "get"

                        + fieldName.substring(0, 1).toUpperCase()

                        + fieldName.substring(1);//注意 实体get Set不要自己改名字不然反射会有问题

                try {

                    @SuppressWarnings("rawtypes")

                    Class tCls = t.getClass();

                    Method getMethod = tCls.getMethod(getMethodName,

                            new Class[] {});

                    Object value = getMethod.invoke(t, new Object[] {});

                    

                    // TODO begin 注意这段  是对属性的值进行处理

                    

                   这是个例子://假设对年龄做了处理 都帮乌龟们减点小寿命

                       if(fieldName.equals("age")){

                           int num =(Integer)value;

                           System.out.println("这只王八"+num+"岁了");

                       }

                    

                        

                    // 判断值的类型后进行强制类型转换

                    String textValue = null;

                       //有boolean类型时

                    if (value instanceof Boolean) {

                        boolean bValue = (Boolean)value;

                            textValue = "男";

                        if (!bValue) {

                            textValue = "女";

                        }

                        

                    } else if (value instanceof Date) {

                        Date date = (Date) value;

                        SimpleDateFormat sdf = new SimpleDateFormat(pattern);

                        textValue = sdf.format(date);

                    } else if (value instanceof byte[]) {

                        // 有图片时设置行高为60px;

                        row.setHeightInPoints(60);

                        // 设置图片所在列宽度为80px,注意这里单位的一个换算

                        sheet.setColumnWidth(i, (short) (35.7 * 80));

                        // sheet.autoSizeColumn(i);

                        byte[] bsValue = (byte[]) value;

                        HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0,

                                1023, 255, (short) 6, index, (short) 6, index);

                        anchor.setAnchorType(2);

                        patriarch.createPicture(anchor, workbook.addPicture(

                                bsValue, HSSFWorkbook.PICTURE_TYPE_JPEG));

                    } else {

                        // 其它数据类型都当作字符串处理

                        textValue = value.toString();

                    }

                    

                    // TODO

                    

                    // 如果不是图片数据，就利用正则表达式判断textValue是否全部由数字组成

                    if (textValue != null) {

                        Pattern p = Pattern.compile("^\\d+(\\.\\d+)?$");

                        Matcher matcher = p.matcher(textValue);

                        if (matcher.matches()) {

                            // 是数字当作double处理

                            cell.setCellValue(Double.parseDouble(textValue));

                        } else {

                            HSSFRichTextString richString = new HSSFRichTextString(

                                    textValue);

                            HSSFFont font3 = workbook.createFont();

                            font3.setColor(HSSFColor.BLUE.index);

                            richString.applyFont(font3);

                            cell.setCellValue(richString);

                        }

                    }

                } catch (SecurityException e) {

                    e.printStackTrace();

                    e=null;

                } catch (NoSuchMethodException e) {

                    e.printStackTrace();

                    e=null;

                } catch (IllegalArgumentException e) {

                    e.printStackTrace();

                    e=null;

                } catch (IllegalAccessException e) {

                    e.printStackTrace();

                    e=null;

                } catch (InvocationTargetException e) {

                    e.printStackTrace();

                    e=null;

                } finally {

                    // 清理资源

                }

            }

        }

        try {

            workbook.write(out);

        } catch (IOException e) {

            e.printStackTrace();

            e=null;

        }

    }