Título del artículo
Exportar tabla
Según tengo entendido, hay dos formas de exportar la tabla.
Una es controlar directamente el encabezado con el código ==== encabezado simple, y la otra
es usar directamente la plantilla para agregar directamente datos === encabezado complejo
confiar
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.9</version>
</dependency>
<!--下面是我直接测试表格,因为要在浏览器导出，直接创建Springboot 简单访问-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>2.3.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
</dependency>
package com.example.demo.test;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* @program: Ecology1
* @description: this is a class
* @author: Mr.zeng
* @create: 2021-03-12 10:02
**/
public class TestTemplateExcel {
/*
*
*/
private static final long serialVersionUID = 1L;
/**
* 生成excel并下载
*/
public void exportExcel(HttpServletResponse response, HttpServletRequest request) {
String userName = request.getParameter("userName");
File newFile = createNewFile();
// File newFile = new File("d:/ss.xls");
// 新文件写入数据，并下载*****************************************************
InputStream is = null;
Workbook workbook = null;
Sheet sheet = null;
try {
is = new FileInputStream(newFile);// 将excel文件转为输入流
workbook=XlsImpUtil.create(is);
// workbook = new XSSFWorkbook(is);// 创建个workbook，
// 获取第一个sheet
sheet = workbook.getSheetAt(0);
} catch (Exception e1) {
e1.printStackTrace();
}
if (sheet != null) {
try {
// 写数据
FileOutputStream fos = new FileOutputStream(newFile);
Row row = sheet.getRow(3);
if (row == null) {
row = sheet.createRow(3);
}
Cell cell = row.getCell(0);
if (cell == null) {
cell = row.createCell(0);
}
// TODO 定义一个list集合假数据
List<Map<String, Object>> lst = new ArrayList();
Map<String, Object> map1 = new HashMap<String, Object>();
// 只能添加11个
for (int i = 0; i < 11; i++) {
map1.put("id" + i, i);
lst.add(map1);
}
row=sheet.getRow(1);
String sj="填报日期：2020年03月24日 15:52 星期四";
cell=row.getCell(0);
cell.setCellValue(sj);
for (int m = 0; m < lst.size(); m++) {
Map<String, Object> map = lst.get(m);
row=sheet.getRow(m+3);
// row = sheet.createRow((int) m + 3);
for (int i = 0; i < 5; i++) {
String value = map.get("id" + m) + "";
if (value.equals("null")) {
value = "0";
}
if(row.getRowNum()>= 7 && row.getRowNum()<=12){
cell=row.getCell(i+2);
}else {
cell=row.getCell(i+2);
}
/* cell = row.createCell(i);*/
cell.setCellValue(value);
}
}
// 填报人
row=sheet.getRow(14);
String tbr="\t\t填报人："+userName;
cell=row.getCell(0);
cell.setCellValue(tbr);
workbook.write(fos);
fos.flush();
fos.close();
// 下载
InputStream fis = new BufferedInputStream(new FileInputStream(
newFile));
// HttpServletResponse response = /*ServletActionContext.getResponse();*/null;
byte[] buffer = new byte[fis.available()];
fis.read(buffer);
fis.close();
response.reset();
response.setContentType("text/html;charset=UTF-8");
OutputStream toClient = new BufferedOutputStream(
response.getOutputStream());
response.setContentType("application/x-msdownload");
String newName = URLEncoder.encode(
"活动报表" + System.currentTimeMillis() + ".xlsx",
"UTF-8");
response.addHeader("Content-Disposition",
"attachment;filename=\"" + newName + "\"");
response.addHeader("Content-Length", "" + newFile.length());
toClient.write(buffer);
toClient.flush();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (null != is) {
is.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
// 删除创建的新文件
this.deleteFile(newFile);
}
/**
* 复制文件
*
* @param s
* 源文件
* @param t
* 复制到的新文件
*/
public void fileChannelCopy(File s, File t) {
try {
InputStream in = null;
OutputStream out = null;
try {
in = new BufferedInputStream(new FileInputStream(s), 1024);
out = new BufferedOutputStream(new FileOutputStream(t), 1024);
byte[] buffer = new byte[1024];
int len;
while ((len = in.read(buffer)) != -1) {
out.write(buffer, 0, len);
}
} finally {
if (null != in) {
in.close();
}
if (null != out) {
out.close();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
private String getSispPath() {
String classPaths = "C:\\Users\\zp\\IdeaProjects\\Ecology1\\src\\main\\resources";
// String classPaths="/usr/weaver/ecology/classbean/com/api/zp";
String[] aa = classPaths.split("/");
String sispPath = "";
for (int i = 1; i < aa.length - 2; i++) {
sispPath += aa[i] + "/";
}
return sispPath;
}
/**
* 读取excel模板，并复制到新文件中供写入和下载
*
* @return
*/
public File createNewFile() {
// 读取模板，并赋值到新文件************************************************************
final String name="C:\\Users\\zp\\IdeaProjects\\demo\\活动报表";
// String name="/usr/weaver/ecology/classbean/com/api/zp/活动报表";
// 文件模板路径
String path = name+".xls";
File file = new File(path);
// 保存文件的路径
String realPath = "";
// 新的文件名
String newFileName = name + System.currentTimeMillis() + ".xls";
// 判断路径是否存在
File dir = new File(realPath);
if (!dir.exists()) {
dir.mkdirs();
}
// 写入到新的excel
File newFile = new File(newFileName);
try {
newFile.createNewFile();
// 复制模板到新文件
fileChannelCopy(file, newFile);
} catch (Exception e) {
e.printStackTrace();
}
return newFile;
}
/**
* 下载成功后删除
*
* @param files
*/
private void deleteFile(File... files) {
for (File file : files) {
if (file.exists()) {
file.delete();
}
}
}
}
import com.fasterxml.jackson.databind.exc.InvalidFormatException;
import org.apache.poi.POIXMLDocument;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import java.io.IOException;
import java.io.InputStream;
import java.io.PushbackInputStream;
/**
* @program: Ecology
* @description: this is a class
* @author: Mr.zeng
* @create: 2021-03-12 11:34
**/
public class XlsImpUtil {
public static Workbook create(InputStream inp) throws IOException, InvalidFormatException, org.apache.poi.openxml4j.exceptions.InvalidFormatException {
if (!inp.markSupported()) {
inp = new PushbackInputStream(inp, 8);
}
if (POIFSFileSystem.hasPOIFSHeader(inp)) {
return new HSSFWorkbook(inp);
}
if (POIXMLDocument.hasOOXMLHeader(inp)) {
return new XSSFWorkbook(OPCPackage.open(inp));
}
throw new IllegalArgumentException("你的excel版本目前poi解析不了");
}
}
Mi controlador
import com.example.demo.test.TestTemplateExcel;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* @program: Ecology1
* @description: this is a class
* @author: Mr.zeng
* @create: 2021-03-12 10:52
**/
@Controller
@RequestMapping("/excel")
public class ExcelMainController {
@RequestMapping("/port")
public String excelport(HttpServletResponse response, HttpServletRequest request){
new TestTemplateExcel().exportExcel(response,request);
return "";
}
}