导出数据到Excel-可以导出图片

标签：except   文件   cep   student   对象属性   use   new   public   ring   

话不多说直接上代码
/**
 *功能描述 excel工具类，可导出带图片或不带图片的数据
 * @param   titles, rows, maps, uploadPath
 *          titles[]:第一行的标题列；
 *          rows:数据行量
 *         maps：装载导出数据的封装了map的list数据集合，注意：此中的map尽量用本类中的方法
 *                 javaBean2Map直接生成，或自己拼接；但需与参数titles[]的标题相关数据对应上
 *         uploadPath: 导出到本地的文件路径和文件名。
 * @return java.lang.String  导出结果。
 */
public static java.lang.String excelOut(java.lang.String[] titles, int rows,
                                        List<Map<String,Object>> maps, java.lang.String uploadPath){

    FileOutputStream fileOut = null;
    BufferedImage bufferImg = null;
    HSSFWorkbook wb = null;

    try{
        ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();
        //创建工作sheet
        wb = new HSSFWorkbook();
        HSSFSheet sheet = wb.createSheet("sheet1");
        //设置单元格内容水平垂直居中
        HSSFCellStyle style = wb.createCellStyle();
        style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);

        //画图的顶级管理器，一个sheet只能获取一个（一定要注意这点）
        HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
        HSSFRow row0 = sheet.createRow(0);
        row0.setHeightInPoints(25);
        if (titles.length == 0){
            return "error";
        }
        HSSFCell cell = null;
        //第一行、标题行列
        for (int i=0;i<titles.length;i++){
            cell = row0.createCell(i);     //第一个单元格
            cell.setCellValue(titles[i]);         //设定值
            cell.setCellStyle(style);
            sheet.setColumnWidth(i,6000);
        }

        HSSFRow row = null;
        HSSFCell cellRow = null;
        HSSFClientAnchor anchor = null;

        for (int i=1;i<=rows;i++){
            int cellColumn = 0;
            //创建行
            row = sheet.createRow(i);
            //设置默认行高
            row.setHeightInPoints(25);
            //行数据处理
            Map<java.lang.String, Object> stringObjectMap = maps.get(i - 1);
            for(Object value : stringObjectMap.keySet()){
                //行单元格
                cellRow = row.createCell(cellColumn);
                cellRow.setCellStyle(style);
                //如果行数据中有图片时候的处理
                if (value.equals("file")){
                    File[] file = (File[]) stringObjectMap.get(value);
                    if (file == null || file.length == 0){
                        cellRow.setCellValue("");
                        continue;
                    }else{
                        row.setHeightInPoints(150);
                        for (int x=0;x<file.length;x++){
                            if (x>0){
                                cellRow = row.createCell(cellColumn);
                                cellRow.setCellStyle(style);
                            }
                            sheet.setColumnWidth(cellColumn,9100);
                            bufferImg = ImageIO.read(file[x]);
                            ImageIO.write(bufferImg, "jpg", byteArrayOut);
                            anchor = new HSSFClientAnchor(0, 0, 1023, 255,(short) cellColumn, i, (short) cellColumn, i);
                            anchor.setAnchorType(3);
                            patriarch.createPicture(anchor, wb.addPicture(byteArrayOut.toByteArray(), HSSFWorkbook.PICTURE_TYPE_JPEG));
                            cellColumn++;
                        }
                        continue;
                    }
                }
                cellRow.setCellValue(stringObjectMap.get(value).toString());
                cellColumn ++;
            }

        }

        fileOut = new FileOutputStream(uploadPath);
        // 写入excel文件
        wb.write(fileOut);

    }catch (Exception e){
        System.out.println(e.fillInStackTrace());
    }finally {
        if(fileOut != null){
            try {
                fileOut.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }
    return "success";
}


/**
 *功能描述 将java类对象属性-值转换成map的键值对
 *           去除getClass方法属性，以及自定义的file属性放置最后。
 * @author gjx
 * @return java.util.Map<java.lang.String,java.lang.Object>
 */
public static Map<java.lang.String, Object> javaBean2Map(Object javaBean) throws Exception {
    Map<java.lang.String, Object> map = new LinkedHashMap<>();
    //反射的实现方式:第一种
    /*Class<Student> studentClass = Student.class;
    studentClass.getClass();*/
    //第二种实现方式
    Method[] methods = javaBean.getClass().getMethods(); // 获取所有方法
    //第三种实现方式
    /*Class.forName("类路径");*/
    java.lang.String fileName = null;
    File[] files = null;
    for (Method method : methods) {
        if (method.getName().startsWith("get")) {
            java.lang.String field = method.getName(); // 拼接属性名
            if (field.contains("getClass")){
                continue;
            }
            field = field.substring(field.indexOf("get") + 3);
            field = field.toLowerCase().charAt(0) + field.substring(1);
            Object value = method.invoke(javaBean, (Object[]) null); // 执行方法
            if (field.equals("file")){
                fileName = field;
                files = (File[]) value;
                continue;
            }
            map.put(field, value);
        }
    }
    if (fileName != null){
        map.put(fileName,files);
    }
    return map;
}

/**
 *功能描述 递归调用让字符串对中调换
 * @author gjx
 * @date
 * @param
 * @return java.lang.String
 */
public static java.lang.String reverse(java.lang.String originStr) {
    if(originStr == null || originStr.length() <= 1)
        return originStr;
    java.lang.String substring = originStr.substring(1);
    java.lang.String s = reverse(substring) + originStr.charAt(0);
    return s;
}


//--------------------------------------------------
public Map<java.lang.String, java.lang.String> getMap(){

    Map<java.lang.String, java.lang.String> map = new HashMap<>();
    map.put("name","姓名");
    map.put("age","年龄");
    map.put("email","邮箱");
    map.put("id","唯一标识");
    map.put("file","图片");
    return map;

}




public void testModuleExcel() throws Exception {
    List<Map<java.lang.String,Object>> list = new ArrayList<>();
    File[] files = new File[2];
    File[] files1 = new File[0];
    files[0] = new File("D:\\报名.jpg");
    files[1] = new File("D:\\报名.jpg");
    User user1 = new User();
    user1.setId(1L);
    user1.setName("gjx");
    user1.setEmail("1345@163.com");
    user1.setAge(23);
    user1.setFile(files);
    User user2 = new User();
    user2.setId(2L);
    user2.setName("gjy");
    user2.setEmail("3745@163.com");
    user2.setAge(25);
    user2.setFile(files1);

    Map<java.lang.String, Object> stringObjectMap = ExcelUntilImg.javaBean2Map(user1);
    Map<java.lang.String, Object> stringObjectMap1 = ExcelUntilImg.javaBean2Map(user2);
    list.add(stringObjectMap);
    list.add(stringObjectMap1);

    Object[] objects = stringObjectMap.keySet().toArray();
    java.lang.String[] titles = new java.lang.String[objects.length];
    Map<java.lang.String, java.lang.String> map = getMap();
    for(int i=0;i<titles.length;i++){
        java.lang.String s1 = objects[i].toString();
        java.lang.String s = map.get(s1);
        titles[i] = s;
    }

    ExcelUntilImg.excelOut(titles,list.size(),list,"D:\\"+"测试数据导出.xls");
}


public static void main(String[] args) {
    try {
        ExcelUntilImg excelUntilImg = new ExcelUntilImg();
        excelUntilImg.testModuleExcel();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

导出数据到Excel-可以导出图片

标签：except   文件   cep   student   对象属性   use   new   public   ring   

原文地址：https://www.cnblogs.com/ysySelf/p/12435667.html