【java类方法】下载Excel格式数据
2021-06-06 21:03
标签:on() 对象 生成文件 result row urlencode 点击下载 int file 页面点击下载查询数据库数据写入到SXSSFWorkbook(工作簿)中的`Sheet sheet = xswb.createSheet();`(工作表) 【java类方法】下载Excel格式数据 标签:on() 对象 生成文件 result row urlencode 点击下载 int file 原文地址:https://www.cnblogs.com/lwl-ong/p/14598785.html
前端发送请求到servlet,把需要的参数传递到后台【我这里把response对象也封装到了(EiInfo inInfo)对象中】(此步骤省略...)
接收参数,通过jdbc的方法(jdbc连接数据库步骤省略...)查询数据库数据,`getMetaData()`直接操作数据库便捷,但效率可能较低
通过response对象获得输出流,将SXSSFWorkbook写入到浏览器
//jdbc方式保存到excel
public EiInfo downData(EiInfo inInfo) {
String sql = convertToSQL(date_PRC1, date_PRC2, type);
String sheetName = convertToSheetName(type);
HttpServletResponse response =(HttpServletResponse) inInfo.get("response");
SXSSFWorkbook xswb;
try {
// 创建xlsx
xswb = createXlsx(sql, sheetName);
// 生成文件
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(sheetName, "utf-8"));
OutputStream outputStream;
outputStream = response.getOutputStream();
xswb.write(outputStream);
outputStream.flush();
outputStream.close();
} catch (Exception e) {
e.printStackTrace();
inInfo.set("status", false);
inInfo.set("msg", "导出失败!");
return inInfo;
}
return inInfo;
}
/*
* 传入sql语句,和需要的命名
* 返回工作簿对象
*/
private SXSSFWorkbook createXlsx(String sql, String sheetName) throws Exception {
SXSSFWorkbook xswb = null;
Connection con = null;
Statement st = null;
ResultSet rs = null;
try {
con = JDBCUtils.getConnection();
st = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
xswb = new SXSSFWorkbook();
// 创建工作表
Sheet sheet = xswb.createSheet();
xswb.setSheetName(0, sheetName);
// 查询数据
rs = st.executeQuery(sql);
System.out.println(rs);
ResultSetMetaData metaData = rs.getMetaData();
int columnCount = metaData.getColumnCount();
// 创建表头
Row head = sheet.createRow(0);
for (int i = 0; i ) {
Cell cell = head.createCell(i);
cell.setCellValue(metaData.getColumnName(i + 1));
}
// 获取总行数
rs.last();
int rowCount = rs.getRow();
rs.beforeFirst();
// 创建标题
for (int i = 1; i ) {
rs.next();
Row row = sheet.createRow(i);
for (int j = 0; j ) {
Cell cell = row.createCell(j);
cell.setCellValue(rs.getString(j + 1));
}
}
} catch (Exception e) {
throw new Exception(e);
} finally {
JDBCUtils.colseResource(con, st, rs);
}
return xswb;
}
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