版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/MaBanSheng/article/details/83547548
一、jar包
从maven仓库下载即可，我是基于项目新加了这些jar包，应该还需要logging包，大家慢慢调试就行，缺哪个就导进哪一个
poi-3.16.jar;
poi-ooxml-3.16.jar;
poi-ooxml-schemas-3.16.jar;
xmlbeans-2.6.0.jar;
commons-collections4-4.1,jar
二、工具类（拷贝网络上资源）
//调用方法传递四个参数
//1、title：表中第一行显示表主旨
//2、headmap：表头数据
//3、datalist：表中数据
//4、datePattern：处理日期格式
//5、colwidth：列宽
//6、out：输出流
public class ExcelUtils {
public static String NO_DEFINE = “no_define”;//未定义的字段
public static String DEFAULT_DATE_PATTERN = "yyyy-MM-dd";//默认日期格式
public static int DEFAULT_COLOUMN_WIDTH = 17;//默认列宽
/**
* 导出Excel
*
* @param title
* @param headMap
* @param dataList
* @param datePattern
* @param colWidth
* @param out
*/
public static void exportExcel(String title, Map<String, String> headMap, List<Map> dataList,
String datePattern, int colWidth, OutputStream out) {
if (datePattern == null) datePattern = DEFAULT_DATE_PATTERN;
// 声明一个工作薄
SXSSFWorkbook workbook = new SXSSFWorkbook(1000);//缓存
workbook.setCompressTempFiles(true);
//表头样式
CellStyle titleStyle = workbook.createCellStyle();
titleStyle.setAlignment(HorizontalAlignment.CENTER);
Font titleFont = workbook.createFont();
titleFont.setFontHeightInPoints((short) 20);
titleStyle.setFont(titleFont);
// 列头样式
CellStyle headerStyle = workbook.createCellStyle();
headerStyle.setBorderLeft(BorderStyle.THIN);
headerStyle.setBorderRight(BorderStyle.THIN);
headerStyle.setBorderTop(BorderStyle.THIN);
headerStyle.setBorderBottom(BorderStyle.THIN);
headerStyle.setAlignment(HorizontalAlignment.CENTER);
Font headerFont = workbook.createFont();
headerFont.setFontHeightInPoints((short) 12);
headerStyle.setFont(headerFont);
// 单元格样式
CellStyle cellStyle = workbook.createCellStyle();
cellStyle.setBorderLeft(BorderStyle.THIN);
cellStyle.setBorderRight(BorderStyle.THIN);
cellStyle.setBorderTop(BorderStyle.THIN);
cellStyle.setBorderBottom(BorderStyle.THIN);
cellStyle.setAlignment(HorizontalAlignment.CENTER);
cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
Font cellFont = workbook.createFont();
cellFont.setFontHeightInPoints((short) 12);
cellStyle.setFont(cellFont);
// 生成一个(带标题)表格
SXSSFSheet sheet = workbook.createSheet();
//设置列宽
int minBytes = colWidth < DEFAULT_COLOUMN_WIDTH ? DEFAULT_COLOUMN_WIDTH : colWidth;//至少字节数
int[] arrColWidth = new int[headMap.size()];
// 产生表格标题行,以及设置列宽
String[] properties = new String[headMap.size()];
String[] headers = new String[headMap.size()];
int ii = 0;
for (Iterator<String> iter = headMap.keySet().iterator(); iter.hasNext(); ) {
String fieldName = iter.next();
properties[ii] = fieldName;
headers[ii] = headMap.get(fieldName);
int bytes = fieldName.getBytes().length;
arrColWidth[ii] = bytes < minBytes ? minBytes : bytes;
sheet.setColumnWidth(ii, arrColWidth[ii] * 256);
ii++;
}
// 遍历集合数据，产生数据行
int rowIndex = 0;
for (Map obj : dataList) {
if (rowIndex == 0) {
SXSSFRow titleRow = sheet.createRow(0);//表头 rowIndex=0
titleRow.createCell(0).setCellValue(title);
titleRow.getCell(0).setCellStyle(titleStyle);
sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, headMap.size() - 1));
SXSSFRow headerRow = sheet.createRow(1); //列头 rowIndex =1
for (int i = 0; i < headers.length; i++) {
headerRow.createCell(i).setCellValue(headers[i]);
headerRow.getCell(i).setCellStyle(headerStyle);
}
rowIndex = 2;//数据内容从 rowIndex=2开始
}
SXSSFRow dataRow = sheet.createRow(rowIndex);
for (int i = 0; i < properties.length; i++) {
SXSSFCell newCell = dataRow.createCell(i);
Object o = obj.get(properties[i]);
String cellValue = "";
if (o == null) {
cellValue = "";
} else if (o instanceof Date) {
cellValue = new SimpleDateFormat(datePattern).format(o);
} else if (o instanceof Float || o instanceof Double) {
cellValue = new BigDecimal(o.toString()).setScale(2, BigDecimal.ROUND_HALF_UP).toString();
} else {
cellValue = o.toString();
}
newCell.setCellValue(cellValue);
newCell.setCellStyle(cellStyle);
}
rowIndex++;
}
try {
workbook.write(out);
workbook.close();
workbook.dispose();
} catch (IOException e) {
e.printStackTrace();
}
}
}
三、controller层
这里根据各自项目，拼凑工具类方法参数。我的如下：
@RequestMapping(value = "/exportExcel", method = RequestMethod.GET)
@ResponseBody
public void exportExcel(HttpServletRequest request, HttpServletResponse response) {
OutputStream outputStream = null;
try {
Map<String, Object> reqMap = new HashMap<String, Object>();
Map<String, Object> params = MyEntityUtils.getRequestParams(request);
params.put("orgId", SessionUtils.getLoginUser().getOrgid());
params.put("action", "q_param");
//处理导出按钮传来的参数
String decode = URLDecoder.decode(String.valueOf(params.get("search")), "UTF-8");
Map searchMap = (Map) JSON.parse(decode);
params.putAll(searchMap);
reqMap.put("datajson", JSON.toJSONString(params));
/**
* 拼凑excel工具类的入参
*/
//执行查询获取excel中的数据
List<Map> list = depositConfirmationService.queryDepositConfirmationList(reqMap);
//第一列大表名
String sheetName = "保证金确认函";
Map<String, Object> headParam = new HashMap<String, Object>();
headParam.put("menuid","103002007");
List<Map> headList = pageConfService.getPageQueryResultByMap(headParam);
Map<String, String> headMap = new HashMap<>();
if (headList != null && headList.size()>0) {
for (Map map : headList) {
headMap.put((String) map.get("field"),(String) map.get("title"));
}
}
//设置response
response.reset();
response.setContentType("application/vnd.ms-excel;charset=utf-8");
response.setHeader("Content-Disposition", "attachment;filename="+ new String(("保证金确认函.xlsx").getBytes(), "iso-8859-1"));
outputStream = response.getOutputStream();
//调用工具类方法将workbook写入到流中
ExcelUtils.exportExcel(sheetName,headMap,list,null,0,outputStream);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (outputStream != null) {
try {
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
四、前台点击按钮执行导出
注意这里使用ajax是不行的。
$("#btnExport").click(function () {
var search = $("#mysearch").serializeObject();//获取查询条件
location.href = "/a/b/c/exportExcel.do?search="+encodeURI(encodeURI(JSON.stringify(search)));
})
五、特别说明
前后台查询参数汉字会乱码，前台使用encodeURI(encodeURI（）），后台使用URLDecoder.decode(str, “UTF-8”)就可以解决。