easyExcel导出 无模版 实体类 导出 自定义表头
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开整
1 导入依赖
<!--导出数据-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>easyexcel</artifactId>
<version>2.1.3</version>
</dependency>
2.样式工具类`
import com.alibaba.excel.write.metadata.style.WriteCellStyle;
import com.alibaba.excel.write.metadata.style.WriteFont;
import com.alibaba.excel.write.style.HorizontalCellStyleStrategy;
import org.apache.poi.ss.usermodel.*;
/**
* excel 样式工具类
* @author MC
* @date 2020/12/17 19:08
*/
public class CellStyleUtil {
/**
* excel首列序号列样式
* @param workbook
* @return
*/
public static CellStyle firstCellStyle(Workbook workbook) {
CellStyle cellStyle = workbook.createCellStyle();
//居中
cellStyle.setAlignment(HorizontalAlignment.CENTER);
cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
cellStyle.setFillForegroundColor(IndexedColors.SKY_BLUE.getIndex());
//设置边框
cellStyle.setBorderBottom(BorderStyle.THIN);
cellStyle.setBorderLeft(BorderStyle.THIN);
cellStyle.setBorderRight(BorderStyle.THIN);
cellStyle.setBorderTop(BorderStyle.THIN);
//文字
Font font = workbook.createFont();
font.setBold(Boolean.TRUE);
cellStyle.setFont(font);
return cellStyle;
}
/**
* 用于设置excel导出时的样式
* easyexcel 导出样式
* @return
*/
public static HorizontalCellStyleStrategy getHorizontalCellStyleStrategy() {
// 头的策略
WriteCellStyle headWriteCellStyle = new WriteCellStyle();
// 背景设置为红色
headWriteCellStyle.setFillForegroundColor(IndexedColors.SKY_BLUE.getIndex());
headWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);
headWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
WriteFont headWriteFont = new WriteFont();
headWriteFont.setFontHeightInPoints((short)12);
headWriteCellStyle.setWriteFont(headWriteFont);
// 内容的策略
WriteCellStyle contentWriteCellStyle = new WriteCellStyle();
// 这里需要指定 FillPatternType 为FillPatternType.SOLID_FOREGROUND 不然无法显示背景颜色.头默认了 FillPatternType所以可以不指定
contentWriteCellStyle.setFillPatternType(FillPatternType.SOLID_FOREGROUND);
// 背景绿色
contentWriteCellStyle.setFillForegroundColor(IndexedColors.YELLOW.getIndex());
contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);
contentWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
//边框
contentWriteCellStyle.setBorderBottom(BorderStyle.THIN);
contentWriteCellStyle.setBorderLeft(BorderStyle.THIN);
contentWriteCellStyle.setBorderRight(BorderStyle.THIN);
contentWriteCellStyle.setBorderTop(BorderStyle.THIN);
//文字
WriteFont contentWriteFont = new WriteFont();
// 字体大小
contentWriteFont.setFontHeightInPoints((short)12);
contentWriteCellStyle.setWriteFont(contentWriteFont);
// 这个策略是 头是头的样式 内容是内容的样式 其他的策略可以自己实现
return new HorizontalCellStyleStrategy(headWriteCellStyle, contentWriteCellStyle);
}
}
3 表头字段设置 自定义在这里操作
3.1 查询表信息 mapper
/**
* 查询表字段信息
* @param tableName
* @return
*/
@Select("select DISTINCT COLUMN_NAME,DATA_TYPE from information_schema.COLUMNS where table_name = #{tableName}")
List<Map> listTableColumn(String tableName);
/**
* 查询表 有哪些字段
* @param tableName
* @return
*/
private List<Map> getAllFiled(String tableName){
return iStandingBookMangerService.listTableColumn(tableName);
}
/**
* 处理表信息
* @param tableName
* @return
*/
private List<List<String>> getMorningCheckHeadFiled(String tableName){
List<List<String>> list = new ArrayList<>();
List<Map> allFiled = getAllFiled(tableName);
for (Map map : allFiled) {
String column_name = map.get("COLUMN_NAME").toString();
List<String> list1 = new ArrayList<>();
list1.add(column_name);
list.add(list1);
}
return list;
}
4.处理查回来的 map 数据 根据表头 动态匹配数据
public List<List<Object>> getData(List<Map<Object, Object>> allDataByTableName, String tableName) throws Exception {
List<Map> allFiled = getAllFiled(tableName);
List<List<Object>> result= new ArrayList(allDataByTableName.size());
List<String> list1 = new ArrayList<>();
for (Map map : allFiled) {
String column_name = map.get("COLUMN_NAME").toString();
list1.add(column_name);
}
for (int i =0;i<allDataByTableName.size();i++) {
Map<Object, Object> temp = allDataByTableName.get(i);
List<Object> list = new ArrayList<>();
for (String s : list1) {
Object o = temp.get(s);
list.add(o);
}
result.add(list);
}
return result;
}
5 .测试走一波
@PostMapping("/exportStandingBook")
@ApiOperation(value = "导出台帐")
public void exportStanding(@RequestBody JSONObject param,@ApiIgnore HttpServletRequest request, @ApiIgnore HttpServletResponse response) throws Exception {
String tableName = param.getString("tableName");
List<Map<Object, Object>> allDataByTableName = iStandingBookMangerService.getAllDataByTableName(tableName);
List<List<Object>> data = getData(allDataByTableName);
List<List<String>> morningCheckHeadFiled = getMorningCheckHeadFiled(allDataByTableName);
try {
response.setCharacterEncoding("utf-8");
//mime类型
response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
response.setHeader("Pragma", "No-cache");
response.setHeader("Content-disposition", "attachment;filename=" + ".xlsx");
// 这里 URLEncoder.encode可以防止中文乱码 当然和 easyExcel没有关系
// 设置文件名
String fileName = URLEncoder.encode("元素列表", "UTF-8");
response.setHeader("Content-disposition", "attachment;filename=" + fileName + ".xlsx");
// 这里需要设置不关闭流
EasyExcel.write(response.getOutputStream())
.head(morningCheckHeadFiled)
.registerWriteHandler(CellStyleUtil.getHorizontalCellStyleStrategy())
.registerWriteHandler(new CustomRowWriteHandler())
// 设置 sheet
.autoCloseStream(Boolean.FALSE).sheet("用户")
//自定义方法输出样式设置。可以不写，就默认缺省。
//自定义注解excel单元格样式，在字段上注解。
//自定义注解
.doWrite(data);
} catch (Exception e) {
// 重置response
response.reset();
response.setContentType("application/json");
response.setCharacterEncoding("utf-8");
Map<String, String> map = new HashMap<>(8);
map.put("status", "failure");
map.put("message", "下载文件失败" + e.getMessage());
response.getWriter().println(JSON.toJSONString(map));
}
}
6.postman测试
7 结果
