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Java Poi操作Excel文件

2017-11-08 18:26 351 查看

Excel操作类

package excelTest;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.List;

import java.util.Map;

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;

public class ExcelOperation {

private static XSSFWorkbook workbook = null;

/**

*判断文件是否存在.

*/

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.

*/

public static boolean sheetExist(String fileDir, String sheetName) throws Exception {

boolean flag = false;

File file = new File(fileDir);

if (file.exists()) {

try {

workbook = new XSSFWorkbook(new FileInputStream(file));

XSSFSheet sheet = workbook.getSheet(sheetName);

if (sheet != null)

flag = true;

} catch (Exception e) {

throw e;

}

} else {

flag = false;

}

return flag;

}

/**

*创建新excel

*/

public static void createExcel(String fileDir, String sheetName, String titleRow[]) throws Exception {

1c6f4
workbook = new XSSFWorkbook();

FileOutputStream out = null;

try {

XSSFRow row = workbook.createSheet(sheetName).createRow(0);

for (int i = 0; i < titleRow.length; i++) {

XSSFCell cell = row.createCell(i);

cell.setCellValue(titleRow);

}

out = new FileOutputStream(fileDir);

[i]workbook.write(out);

} catch (Exception e) {

throw e;

} finally {

try {

if (out != null) {

out.close();

}

} catch (IOException e) {

e.printStackTrace();

}

}

}

/**

*往excel中写入mapList.size()行数据

*/

public static void writeToExcelRow(String fileDir, String sheetName, List<Map<String, String>> mapList, int rowId)

throws Exception {

File file = new File(fileDir);

try {

workbook = new XSSFWorkbook(new FileInputStream(file));

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

FileOutputStream out = null;

XSSFSheet sheet = workbook.getSheet(sheetName);

// 获取表格的总行数

// introwCount = sheet.getLastRowNum() + 1; // 需要加一

// 获取表头的列数

int columnCount = sheet.getRow(0).getLastCellNum();

try {

XSSFRow titleRow = sheet.getRow(0);

if (titleRow != null) {

for (Map<String, String> map : mapList) {

XSSFRow newRow = sheet.createRow(rowId++);

for (int columnIndex = 0; columnIndex < columnCount; columnIndex++) {

String mapKey = titleRow.getCell(columnIndex).toString().trim();

XSSFCell cell = newRow.createCell(columnIndex);

cell.setCellValue(map.get(mapKey) == null ? null : map.get(mapKey).toString());

}

}

}

out = new FileOutputStream(fileDir);

workbook.write(out);

} catch (Exception e) {

throw e;

} finally {

try {

if (out != null) {

out.close();

}

} catch (IOException e) {

e.printStackTrace();

}

}

}

/**

*往excel中写入一格数据

*/

public static void writeToExcelCell(String fileDir, String sheetName, String value, int rowId, int columnId)

throws Exception {

File file = new File(fileDir);

try {

workbook = new XSSFWorkbook(new FileInputStream(file));

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

FileOutputStream out = null;

XSSFSheet sheet = workbook.getSheet(sheetName);

// 获取表格的总行数

// introwCount = sheet.getLastRowNum() + 1; // 需要加一

// 获取表头的列数

// intcolumnCount = sheet.getRow(0).getLastCellNum();

try {

XSSFRow row = sheet.getRow(rowId);

if (row != null) {

XSSFCell cell = row.getCell(columnId);

if (cell != null) {

cell.setCellValue(value == null ? null : value);

} else {

XSSFCell newCell = row.createCell(columnId);

newCell.setCellValue(value == null ? null : value);

}

}

out = new FileOutputStream(fileDir);

workbook.write(out);

} catch (Exception e) {

throw e;

} finally {

try {

if (out != null) {

out.close();

}

} catch (IOException e) {

e.printStackTrace();

}

}

}

}

测试

package excelTest;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

public class ExcelTest {

public static void main(String[] args) throws Exception{

String excelFilePath="D:/test.xlsx";

String sheetName="sheet0";

String[] titleRow={"id", "name", "password"};

Map<String, String> map1=new HashMap<String, String>();

map1.put("id","1001");

map1.put("name", "anna");

map1.put("password", "ANNA");

Map<String, String> map2=new HashMap<String, String>();

map2.put("id","1002");

map2.put("name", "bob");

map2.put("password", "BOB");

List<Map<String, String>> mapList=new ArrayList<Map<String, String>>();

mapList.add(map1);

mapList.add(map2);

System.out.println(ExcelOperation.fileExist(excelFilePath));

ExcelOperation.createExcel(excelFilePath, sheetName, titleRow);

System.out.println(ExcelOperation.fileExist(excelFilePath));

ExcelOperation.writeToExcelRow(excelFilePath, sheetName, mapList, 1);//从表的第二行开始写

}

}

结果

jar包

需要的jar包

jar包下载：http://poi.apache.org

ps：本文处理的是.xlsx文件，把代码中XSSF全部改成HSSF即可访问.xls文件。xls文件是07版之前的，一张表最多只能存65536行数据。xlsx是07版之后的Excel，可以存很多很多很多…

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标签： java excel poi

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