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Java Poi操作Excel写入数据并设置style

2018-01-21 14:15 741 查看

1、向Excel中写入数据，并再追加一遍相同的数据

ExcelWriter.writeToExcel方法可以向指定excel表中写入mapList中的数据；

ExcelWriter.addToExcel方法可以向指定excel表中追加mapLit中的数据；

package excelUtils;

import java.io.*;

import java.util.*;

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 ExcelWriter {

private static XSSFWorkbook workbook = null;

public static void main(String[] args) {

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

String sheetName = "sheet1";

String[] titleRow = { "title1", "title2", "title3", "title4", "title5", "title6"
20000
};

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

for (int i = 0; i < 5; i++) {

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

map.put(titleRow[0], "第" + (i + 1) + "行第1列");

map.put(titleRow[1], "第" + (i + 1) + "行第2列");

map.put(titleRow[2], "第" + (i + 1) + "行第3列");

map.put(titleRow[3], "第" + (i + 1) + "行第4列");

map.put(titleRow[4], "第" + (i + 1) + "行第5列");

map.put(titleRow[5], "第" + (i + 1) + "行第6列");

mapList.add(map);

}

writeToExcel(fileDir, sheetName, titleRow, mapList);

addToExcel(fileDir, sheetName, mapList);

}

/**

*根据标题，mapList写入制定excel表中

*

*@param fileDir

*@param sheetName

*@param titleRow

*@param mapList

*/

public static void writeToExcel(String fileDir, String sheetName, String[] titleRow,

List<Map<String, String>> mapList) {

if (!ExcelCreater.fileExist(fileDir)) {

ExcelCreater.createExcel(fileDir, sheetName, titleRow);

}

if (!ExcelCreater.sheetExist(fileDir, sheetName)) {

ExcelCreater.createSheet(fileDir, sheetName, titleRow);

}

writeToExcelRow(fileDir, sheetName, mapList, 1);

}

/**

*从第rowId行开始将mapList写入

*

*@param fileDir

*@param sheetName

*@param mapList

*@param rowId

*/

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

File file = new File(fileDir);

FileOutputStream out = null;

try {

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

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();

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 ? "" : map.get(mapKey).toString());

}

}

}

out = new FileOutputStream(fileDir);

workbook.write(out);

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

if (out != null) {

out.close();

}

} catch (IOException e) {

e.printStackTrace();

}

}

}

/**

*添加到已存在excel

*

*@param fileDir

*@param sheetName

*@param mapList

*/

public static void addToExcel(String fileDir, String sheetName, List<Map<String, String>> mapList) {

File file = new File(fileDir);

FileOutputStream out = null;

try {

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

XSSFSheet sheet = workbook.getSheet(sheetName);

int rowId = sheet.getLastRowNum() + 1; // 获取表格的总行数

int columnCount = sheet.getRow(0).getLastCellNum();// 获取表头的列数

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 ? "" : map.get(mapKey).toString());

}

}

}

out = new FileOutputStream(fileDir);

workbook.write(out);

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

if (out != null) {

out.close();

}

} catch (IOException e) {

e.printStackTrace();

}

}

}

/**

*向指定单元格写入数据

*

*@param fileDir

*@param sheetName

*@param value

*@param rowId

*@param columnId

*@throws Exception

*/

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

File file = new File(fileDir);

FileOutputStream out = null;

try {

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

XSSFSheet sheet = workbook.getSheet(sheetName);

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) {

e.printStackTrace();

} finally {

try {

if (out != null) {

out.close();

}

} catch (IOException e) {

e.printStackTrace();

}

}

}

}

2、写入结果

3、设置style

package excelUtils;

import java.awt.Color;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.HashMap;

import java.util.Map;

import org.apache.poi.ss.usermodel.FillPatternType;

import org.apache.poi.ss.usermodel.HorizontalAlignment;

import org.apache.poi.ss.usermodel.VerticalAlignment;

import org.apache.poi.xssf.usermodel.XSSFSheet;

import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import org.apache.poi.xssf.usermodel.XSSFCell;

import org.apache.poi.xssf.usermodel.XSSFCellStyle;

import org.apache.poi.xssf.usermodel.XSSFColor;

import org.apache.poi.xssf.usermodel.XSSFFont;

import org.apache.poi.xssf.usermodel.XSSFRow;

public class ExcelStyle {

private static XSSFWorkbook workbook = null;

private static Color light_green = new Color(198, 224, 180);

private static Color light_orange = new Color(248, 203, 173);

private static Color light_blue = new Color(180, 198, 231);

private static Color light_yellow = new Color(255, 230, 153);

private static Color light_gray = new Color(217, 217, 217);

public static void main(String[] args){

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

String sheetName = "sheet1";

int[] columnWidth = { 10, 20, 30, 10, 20, 30 };//每列列宽

setExcelSimpleStyle(fileDir, sheetName, columnWidth);

}

/**

*只设置列宽，颜色按默认绿橙蓝排列，居中

*

*@param fileDir

*@param sheetName

*@param columnWidth

*@return

*/

public static boolean setExcelSimpleStyle(String fileDir, String sheetName, int[] columnWidth) {

String[] colors = { "light_green", "light_orange", "light_blue" };

boolean inCenter = true;

if (!ExcelCreater.fileExist(fileDir)) {

return false;

}

if (!ExcelCreater.sheetExist(fileDir, sheetName)) {

return false;

}

setStyle(fileDir, sheetName, columnWidth, colors, inCenter);

return true;

}

/**

*判断是否存在，设置列宽，颜色，居中，返回是否设置成功

*

*@param fileDir

*@param sheetName

*@param columnWidth

*@param colors

*@param inCenter

*/

public static boolean setExcelStyle(String fileDir, String sheetName, int[] columnWidth, String[] colors,

boolean inCenter) {

if (!ExcelCreater.fileExist(fileDir)) {

return false;

}

if (!ExcelCreater.sheetExist(fileDir, sheetName)) {

return false;

}

setStyle(fileDir, sheetName, columnWidth, colors, inCenter);

return true;

}

/**

*设置列宽，颜色，居中

*

*@param fileDir

*@param sheetName

*@param columnWidth

*@param colors

*@param inCenter

*/

public static void setStyle(String fileDir, String sheetName, int[] columnWidth, String[] colors,

boolean inCenter) {

FileOutputStream out = null;

File file = new File(fileDir);

try {

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

XSSFSheet sheet = workbook.getSheet(sheetName);

setColumnWidth(sheet, columnWidth);

int rowCount = sheet.getLastRowNum() + 1;

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

Map<Integer, XSSFCellStyle> styleMap = new HashMap<>();

for (int colorIndex = 0; colorIndex < colors.length; colorIndex++) {

XSSFCellStyle style = getStyle(colors[colorIndex], inCenter, null, 11);

styleMap.put(colorIndex, style);

}

for (int rowIndex = 0; rowIndex < rowCount; rowIndex++) {

XSSFRow newRow = sheet.getRow(rowIndex);

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

XSSFCell cell = newRow.getCell(columnIndex);

cell.setCellStyle(styleMap.get(columnIndex % styleMap.size()));

}

}

out = new FileOutputStream(fileDir);

workbook.write(out);

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

if (out != null) {

out.close();

}

} catch (IOException e) {

e.printStackTrace();

}

}

}

/**

*设置每行高度

*

*@param sheet

*@param rowHeight

*/

public static void setRowHeight(XSSFSheet sheet, int rowHeight) {

sheet.setDefaultRowHeight((short) rowHeight);

}

/**

*分别设置每一列宽度，若只有一个值，全部设为此值

*

*@param sheet

*@param columnWidth

*/

public static void setColumnWidth(XSSFSheet sheet, int[] columnWidth) {

if (columnWidth.length == 1) {

sheet.setDefaultColumnWidth(columnWidth[0]);

} else {

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

sheet.setColumnWidth(i, columnWidth * 256);

}

}

}

/**

*获得制定颜色字体居中的style

*

*@param color

*@param inCenter

*@param fontName

*@param fontHeight

*/

public static XSSFCellStyle getStyle(String color, boolean inCenter, String fontName, int fontHeight) {

XSSFCellStyle style = [i]workbook.createCellStyle();

if (color != null && !color.equals("")) {

setStyleColor(style, color);

}

if (inCenter == true) {

setAlignment(style);

}

if (fontName != null && !fontName.equals("")) {

setStyleFont(style, fontName, fontHeight);

}

return style;

}

/**

*设置style的颜色，目前五种颜色可选

*

*@param style

*@param color

*/

public static void setStyleColor(XSSFCellStyle style, String color) {

if (color.equals("light_green")) {

style.setFillForegroundColor(new XSSFColor(light_green));

}

if (color.equals("light_orange")) {

style.setFillForegroundColor(new XSSFColor(light_orange));

}

if (color.equals("light_blue")) {

style.setFillForegroundColor(new XSSFColor(light_blue));

}

if (color.equals("light_yellow")) {

style.setFillForegroundColor(new XSSFColor(light_yellow));

}

if (color.equals("light_gray")) {

style.setFillForegroundColor(new XSSFColor(light_gray));

}

style.setFillPattern(FillPatternType.SOLID_FOREGROUND);

}

/**

*设置style字体

*

*@param style

*@param fontName

*@param fontHeight

*/

public static void setStyleFont(XSSFCellStyle style, String fontName, int fontHeight) {

XSSFFont font = workbook.createFont();

font.setFontName(fontName);

font.setFontHeight(fontHeight);

style.setFont(font);

}

/**

*设置style水平垂直居中

*

*@param style

*/

public static void setAlignment(XSSFCellStyle style) {

style.setAlignment(HorizontalAlignment.CENTER);// 水平居中

style.setVerticalAlignment(VerticalAlignment.CENTER);// 垂直居中

}

}

4、最终结果

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标签： java poi excel

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