改良版，关于添加依赖之类的之前一篇文章里面有。
这篇是把之前的方法抽成通用模板。
一、添加一个实体类
package com.lencity.securitymanagementplatform.data.entity;
import java.util.List;
public class XlsData {
public static final int DATA_TYPE_INTEGER = 0;
public static final int DATA_TYPE_STRING = 1;
private List<String> titles;//表头
private List<Integer> types;//数据类型
private List<List<Object>> values;存表数据
public List<Integer> getTypes() {
return types;
}
public void setTypes(List<Integer> types) {
this.types = types;
}
public List<String> getTitles() {
return titles;
}
public void setTitles(List<String> titles) {
this.titles = titles;
}
public List<List<Object>> getValues() {
return values;
}
public void setValues(List<List<Object>> values) {
this.values = values;
}
}
二、创建一个service类
package com.lencity.securitymanagementplatform.service;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFDataFormat;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.springframework.stereotype.Service;
import com.lencity.securitymanagementplatform.data.entity.XlsData;
@Service
public class XlsService {
//写一个接口，哪个控制器需要加上导出excel功能就继承这个接口
public static interface IXlsOutputProcessor {
public XlsData processXlsData(Map<String, Object> condition);
}
//解析数据创建excel
public HSSFWorkbook createExcelData(IXlsOutputProcessor processor, Map<String, Object> condition) {
XlsData xlsData = processor.processXlsData(condition);
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet("统计表");// 创建一个excel表单
HSSFRow titleRow = sheet.createRow(0);
// 设置列宽，setColumnWidth的第二个参数要乘以256，这个参数的单位是1/256个字符宽度
sheet.setColumnWidth(1, 15 * 256);
sheet.setColumnWidth(3, 20 * 256);
HSSFCellStyle style = workbook.createCellStyle();
style.setDataFormat(HSSFDataFormat.getBuiltinFormat("m/d/yy h:mm"));// 设置日期格式
HSSFFont font = workbook.createFont();// 设置为居中加粗
font.setBold(true);
style.setAlignment(HorizontalAlignment.CENTER);
style.setFont(font);
List<String> titles = xlsData.getTitles();
HSSFCell cell;
/* 构造表头 */
for (int i = 0; i < titles.size(); i++) {
cell = titleRow.createCell(i);
cell.setCellValue(titles.get(i));
cell.setCellStyle(style);
}
int rowNum = 1;
List<Integer> dataTypes = xlsData.getTypes();
List<List<Object>> values = xlsData.getValues();
for (int i = 0; i < values.size(); i++) {
List<Object> value = values.get(i);
HSSFRow row = sheet.createRow(rowNum);
for (int j = 0; j < value.size(); j++) {
switch (dataTypes.get(j)) {
case XlsData.DATA_TYPE_INTEGER:
row.createCell(j).setCellValue((Integer) value.get(j));
break;
case XlsData.DATA_TYPE_STRING:
row.createCell(j).setCellValue((String) value.get(j));
break;
}
}
rowNum++;
}
return workbook;
}
// 浏览器导出excel
public void buildExcelDocument(String filename, HSSFWorkbook workbook, HttpServletResponse response)
throws Exception {
response.reset();
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(filename, "utf-8"));
OutputStream outputStream = response.getOutputStream();
workbook.write(outputStream);
outputStream.flush();
outputStream.close();
}
// 下载excel模板功能
public void downloadTemplate(HttpServletResponse response,HttpServletRequest request) throws Exception {
String fileName="导出模板.xls";
response.reset();
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "utf-8"));
String filePath=request.getServletContext().getRealPath("/excel/")+fileName;
FileInputStream input=new FileInputStream(filePath);
OutputStream out=response.getOutputStream();
byte[] b=new byte[2048];
int len;
while((len=input.read(b))!=-1) {
out.write(b,0,len);
}
response.setHeader("Content-Length", String.valueOf(input.getChannel().size()));
input.close();
}
}
三、控制器
假设我们要在用户页面加上导出表格的功能，那就在用户的控制器上继承接口
public class UserController implements IXlsOutputProcessor {
继承之后需要在控制器中重写接口方法，
导出的表格样式.png
关于封装数据，主要就是根据自己实际的项目需求，来构造数据了
// 封装数据
@Override
public XlsData processXlsData(Map<String, Object> condition) {
List<String> titles = new ArrayList<>();//表头
List<Integer> dataTypes = new ArrayList<>();//表数据类型
List<List<Object>> values = new ArrayList<>();//表头对应的数据
titles.add("姓名");
dataTypes.add(XlsData.DATA_TYPE_STRING);
titles.add("手机号码");
dataTypes.add(XlsData.DATA_TYPE_STRING);
titles.add("职位");
dataTypes.add(XlsData.DATA_TYPE_STRING);
titles.add("部门");
dataTypes.add(XlsData.DATA_TYPE_STRING);
List<User> users = userService.getUsersByCondition(condition);
XlsData xlsData = new XlsData();
xlsData.setTitles(titles);
xlsData.setTypes(dataTypes);
for (User user : users) {
List<Object> tmpList = new ArrayList<>();
tmpList.add(user.getName());
tmpList.add(user.getMobile());
tmpList.add(user.getPosition());
tmpList.add(departmentService.getDepartmentNameByDepartmentCode(user.getDepartmentCode()));
values.add(tmpList);
}
xlsData.setValues(values);
return xlsData;
}
// 导出excel，前台js，点击 导出excel 关联的路径就是这个
@PostMapping(value = "/downLoadXls")
@ResponseBody
public String downLoadXls(Map<String, Object> condition, HttpServletResponse response) throws Exception {
String fileName = "导出excel.xls";
HSSFWorkbook workbook = xlsService.createExcelData(this, condition);
xlsService.buildExcelDocument(fileName, workbook, response);
JSONObject jsonObject = new JSONObject();
jsonObject.put("code", 1);
return jsonObject.toString();
}
// 下载模板，前台js，点击 下载模板 关联的路径就是这个
@PostMapping(value = "/downloadTemplate")
@ResponseBody
public String downloadTemplate(HttpServletResponse response,HttpServletRequest request) throws Exception {
String fileName = "导出excel.xls";
xlsService.downloadTemplate(response, request);
JSONObject jsonObject = new JSONObject();
jsonObject.put("code", 1);
return jsonObject.toString();
}
前台界面.png
模板的存放位置
前台按钮代码
<button type="button" class="btn btn-primary waves-effect" onclick="downloadTemplate()" id="downloadTemplate">
<i class="material-icons">vertical_align_bottom</i>
<span>下载模板</span>
</button>
<button type="button" class="btn btn-primary waves-effect"onclick="exportExcel()">
<i class="material-icons">vertical_align_bottom</i>
<span>导出表格</span>
</button>
js
form表单里面是页面的表单筛选条件，如果要导数据库所有的数据，可把form表单去掉。如果导出的数据是有筛选条件的，需要改一下form表单
function exportExcel() {
var name = $("#name").val();
var departmentCode = $("#departmentCode").find("option:selected").val();
var form = $("<form>");
$('body').append(form);
form.attr('style','display:none');
form.attr('target','');
form.attr('method','post');
form.attr('action',contextPath+'/user/downLoadXls');//下载文件的请求路径
//对应查询条件的开始时间
var input1 = $('<input>');
input1.attr('type','hidden');
input1.attr('name',"name");
input1.attr('value',name);
form.append(input1);
//对应查询条件的结束时间
var input2 = $('<input>');
input2.attr('type','hidden');
input2.attr('name','departmentCode');
input2.attr('value',departmentCode);
form.append(input2);
form.submit();
}
下载模板的js
function downloadTemplate() {
var form = $("<form>");
$('body').append(form);
form.attr('style', 'display:none');
form.attr('target', '');
form.attr('method', 'post');
form.attr('action', contextPath + '/user/downloadTemplate');// 下载文件的请求路径
form.submit();
}
Over~
