导出数据到Excel-可以导出图片
Posted ysyself
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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();