如何使用Java创建Excel(.xls 和 .xlsx)文件 并写入数据
1，需要依赖的jar包，
org.apache.poi
poi
3.17
org.apache.poi
poi-ooxml
3.17
org.apache.poi
poi-ooxml-schemas
3.17
org.apache.xmlbeans
xmlbeans
2.6.0
commons-collections
commons-collections
3.2.2
dom4j
dom4j
1.6.1
JAR packages that need to be dependent2，创建Excel（.xls 和 .xlsx的方法）我详细地写了如何创建.xls 文件，创建.xlsx文件就是引用的类不一样，步骤基本上是一样的。
/**
*
*/
package com.nokia.jira.utils;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
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.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.Color;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
/**
* @author bpan
*
* created 2018年2月27日
*/
public class CreateExcelFile {
private static HSSFWorkbook hWorkbook = null;
private static XSSFWorkbook xWorkbook = null;
/**
* 判断文件是否存在.
* @param fileDir 文件路径
* @return
*/
public static boolean fileExist(String fileDir){
boolean flag = false;
File file = new File(fileDir);
flag = file.exists();
return flag;
}
/**
* 判断文件的sheet是否存在.
* @param fileDir 文件路径
* @param sheetName 表格索引名
* @return boolean
*/
public static boolean XlsSheetExist(String fileDir, String sheetName){
boolean flag = false;
File file = new File(fileDir);
if (file.exists()) {
//文件存在，创建workbook
try {
hWorkbook = new HSSFWorkbook(new FileInputStream(file));
HSSFSheet sheet = hWorkbook.getSheet(sheetName);
if (sheet!=null) {
//文件存在，sheet存在
flag = true;
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}else {
//文件不存在
flag = false;
}
return flag;
}
/**
* 创建新excel(xls).
* @param fileDir excel的路径
* @param sheetNames 要创建的表格索引列表
* @param titleRow excel的第一行即表格头
*/
public static void createExcelXls(String fileDir, List sheetNames, String titleRow[]){
//创建workbook
hWorkbook = new HSSFWorkbook();
//新建文件
FileOutputStream fileOutputStream = null;
HSSFRow row = null;
try {
CellStyle cellStyle = hWorkbook.createCellStyle();
cellStyle.setAlignment(HorizontalAlignment.LEFT);
cellStyle.setVerticalAlignment(VerticalAlignment.BOTTOM);
//添加Worksheet（不添加sheet时生成的xls文件打开时会报错)
for(int i = 0; i> mapList) throws Exception{
//创建workbook
File file = new File(fileDir);
try {
hWorkbook = new HSSFWorkbook(new FileInputStream(file));
}catch(FileNotFoundException e){
e.printStackTrace();
}catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//文件流
FileOutputStream fileOutputStream = null;
HSSFSheet sheet = hWorkbook.getSheet(sheetName);
// 获取表格的总行数
// int rowCount = sheet.getLastRowNum() + 1; // 需要加一
//获取表头的列数
int columnCount = sheet.getRow(0).getLastCellNum();
try {
// 获得表头行对象
HSSFRow titleRow = sheet.getRow(0);
//创建单元格显示样式
CellStyle cellStyle = hWorkbook.createCellStyle();
cellStyle.setAlignment(HorizontalAlignment.LEFT);
cellStyle.setVerticalAlignment(VerticalAlignment.BOTTOM);
if(titleRow!=null){
for(int rowId = 0; rowId < mapList.size(); rowId++){
Map map = mapList.get(rowId);
HSSFRow newRow=sheet.createRow(rowId+1);
newRow.setHeight((short)(20*20));//设置行高 基数为20
for (short columnIndex = 0; columnIndex < columnCount; columnIndex++) { //遍历表头
//trim()的方法是删除字符串中首尾的空格
String mapKey = titleRow.getCell(columnIndex).toString().trim();
HSSFCell cell = newRow.createCell(columnIndex);
cell.setCellStyle(cellStyle);
cell.setCellValue(map.get(mapKey)==null ? null : map.get(mapKey).toString());
}
}
}
fileOutputStream = new FileOutputStream(fileDir);
hWorkbook.write(fileOutputStream);
} catch (Exception e) {
throw e;
} finally {
try {
if (fileOutputStream != null) {
fileOutputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 创建Excel(xlsx)
* @param fileDir 文件名称及地址
* @param sheetName sheet的名称
* @param titleRow 表头
*/
public static void createExcelXlsx(String fileDir, String sheetName, String titleRow[]){
}
public static void main(String[] args) {
String fileDir = "d:\\workbook.xls";
List sheetName = new ArrayList<>();
sheetName.add("A");
sheetName.add("B");
sheetName.add("C");
System.out.println(sheetName);
String[] title = {"id","name","password"};
CreateExcelFile.createExcelXls(fileDir, sheetName, title);
List> userList1 = new ArrayList>();
Map map=new HashMap();
map.put("id", "111");
map.put("name", "张三");
map.put("password", "111！@#");
Map map2=new HashMap();
map2.put("id", "222");
map2.put("name", "李四");
map2.put("password", "222！@#");
Map map3=new HashMap();
map3.put("id", "33");
map3.put("name", "王五");
map3.put("password", "333！@#");
userList1.add(map);
userList1.add(map2);
userList1.add(map3);
Map>> users = new HashMap<>();
users.put("A", userList1);
List> userList2 = new ArrayList>();
Map map4=new HashMap();
map4.put("id", "111");
map4.put("name", "张三");
map4.put("password", "111！@#");
Map map5=new HashMap();
map5.put("id", "222");
map5.put("name", "李四");
map5.put("password", "222！@#");
Map map6=new HashMap();
map6.put("id", "33");
map6.put("name", "王五");
map6.put("password", "333！@#");
userList2.add(map4);
userList2.add(map5);
userList2.add(map6);
users.put("B", userList2);
List> userList3 = new ArrayList>();
users.put("C", userList3);
System.out.println(sheetName.size());
//删除List 集合中特定的元素
for(Iterator sheeNameIterator = sheetName.iterator();sheeNameIterator.hasNext();){
String sheet = sheeNameIterator.next();
if ( users.get(sheet).size() == 0) {
sheeNameIterator.remove();
}
}
System.out.println(sheetName.size());
createExcelXls(fileDir, sheetName, title);
for (int j = 0; j < sheetName.size(); j++) {
try {
writeToExcelXls(fileDir, sheetName.get(j), users.get(sheetName.get(j)));
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
Create Excel File