##SAMPLE GALLERYに掲載されたソースを疎通してimport文も付けました。
#4.java poi Excel

Excelファイルを作成
シート名の設定
シートの色を指定
セルに値を入力
文字の大きさを指定
フォントを指定
文字を太字にする
文字をイタリックにする
文字に下線を引く
文字に取消線を引く
セルの背景色を指定
値の整列（水平方向）
値の整列（垂直方向）
セルの文字の色を指定
セルの枠線を指定
セルの枠線の色を指定
セルの折り返しを指定
セルにハイパーリンクを設定
セルの結合

##4.java poi Excel
####4-1.Excelファイルを作成

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

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class SamplePoi {

    public static void main(String[] args) throws IOException {
        OutputStream os = null;
        try {
            os = new FileOutputStream("TestExcelFile.xlsx");
            XSSFWorkbook workbook = new XSSFWorkbook();
            workbook.createSheet();
            workbook.write(os);//ここでエクセルファイルを作成しています。
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                os.close();
            }
        }
    }

}

####4-2.シート名の設定

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

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class SamplePoi {

    public static void main(String[] args) throws IOException {
        OutputStream os = null;
        try {
            os = new FileOutputStream("TestExcelFile.xlsx");
            XSSFWorkbook workbook = new XSSFWorkbook();
            workbook.createSheet("シート1");//ここでシート名を指定しています。
            workbook.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                os.close();
            }
        }
    }

}

####4-3.シートの色を指定

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

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import static java.awt.Color.BLUE;

public class SamplePoi {

    public static void main(String[] args) throws IOException {
        OutputStream os = null;
        try {
            os = new FileOutputStream("TestExcelFile.xlsx");
            XSSFWorkbook workbook = new XSSFWorkbook();
            XSSFSheet sheet = workbook.createSheet("シート1");
            sheet.setTabColor(new XSSFColor(BLUE));
            workbook.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                os.close();
            }
        }
    }

}

####4-4.セルに値を入力

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

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class SamplePoi {

    public static void main(String[] args) throws IOException {
        OutputStream os = null;
        try {
            os = new FileOutputStream("TestExcelFile.xlsx");
            XSSFWorkbook workbook = new XSSFWorkbook();
            XSSFSheet sheet = workbook.createSheet("シート1");
            XSSFRow row = sheet.createRow(0);
            XSSFCell cell = row.createCell(0);
            cell.setCellValue("Cell Value");//ここでセルに値を設定しています。
            workbook.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                os.close();
            }
        }
    }

}

####4-5.文字の大きさを指定

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

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class SamplePoi {

    public static void main(String[] args) throws IOException {
        OutputStream os = null;
        try {
            os = new FileOutputStream("TestExcelFile.xlsx");
            XSSFWorkbook workbook = new XSSFWorkbook();
            XSSFSheet sheet = workbook.createSheet("シート1");
            XSSFRow row = sheet.createRow(0);
            XSSFCell cell = row.createCell(0);
            cell.setCellValue("Cell Value");
            XSSFCellStyle style = workbook.createCellStyle();
            XSSFFont font = workbook.createFont();
            font.setFontHeightInPoints((short) 20);//ここで文字の大きさを指定しています。
            style.setFont(font);
            cell.setCellStyle(style);
            workbook.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                os.close();
            }
        }
    }

}

####4-6.フォントを指定

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

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class SamplePoi {

    public static void main(String[] args) throws IOException {
        OutputStream os = null;
        try {
            os = new FileOutputStream("TestExcelFile.xlsx");
            XSSFWorkbook workbook = new XSSFWorkbook();
            XSSFSheet sheet = workbook.createSheet("シート1");
            XSSFRow row = sheet.createRow(0);
            XSSFCell cell = row.createCell(0);
            cell.setCellValue("Cell Value");
            XSSFCellStyle style = workbook.createCellStyle();
            XSSFFont font = workbook.createFont();
            font.setFontName("Times New Roman");//ここでフォントを指定しています。
            style.setFont(font);
            cell.setCellStyle(style);
            workbook.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                os.close();
            }
        }
    }

}

####4-7.文字を太字にする

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

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class SamplePoi {

    public static void main(String[] args) throws IOException {
        OutputStream os = null;
        try {
            os = new FileOutputStream("TestExcelFile.xlsx");
            XSSFWorkbook workbook = new XSSFWorkbook();
            XSSFSheet sheet = workbook.createSheet("シート1");
            XSSFRow row = sheet.createRow(0);
            XSSFCell cell = row.createCell(0);
            cell.setCellValue("Cell Value");
            XSSFCellStyle style = workbook.createCellStyle();
            XSSFFont font = workbook.createFont();
            font.setBold(true);//ここで太字に設定しています。
            style.setFont(font);
            cell.setCellStyle(style);
            workbook.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                os.close();
            }
        }
    }

}

####4-8.文字をイタリックにする

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

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class SamplePoi {

    public static void main(String[] args) throws IOException {
        OutputStream os = null;
        try {
            os = new FileOutputStream("TestExcelFile.xlsx");
            XSSFWorkbook workbook = new XSSFWorkbook();
            XSSFSheet sheet = workbook.createSheet("シート1");
            XSSFRow row = sheet.createRow(0);
            XSSFCell cell = row.createCell(0);
            cell.setCellValue("Cell Value");
            XSSFCellStyle style = workbook.createCellStyle();
            XSSFFont font = workbook.createFont();
            font.setItalic(true);//ここでイタリックに指定しています。
            style.setFont(font);
            cell.setCellStyle(style);
            workbook.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                os.close();
            }
        }
    }

}

####4-9.文字に下線を引く

import org.apache.poi.ss.usermodel.FontUnderline;
import org.apache.poi.xssf.usermodel.*;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class SamplePoi {

    public static void main(String[] args) throws IOException {
        OutputStream os = null;
        try {
            os = new FileOutputStream("TestExcelFile.xlsx");
            XSSFWorkbook workbook = new XSSFWorkbook();
            XSSFSheet sheet = workbook.createSheet("シート1");
            XSSFRow row = sheet.createRow(0);
            XSSFCell cell = row.createCell(0);
            cell.setCellValue("Cell Value");
            XSSFCellStyle style = workbook.createCellStyle();
            XSSFFont font = workbook.createFont();
            font.setUnderline(FontUnderline.SINGLE);//ここで下線を引いています。
            style.setFont(font);
            cell.setCellStyle(style);
            workbook.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                os.close();
            }
        }
    }

}

####4-10.文字に取消線を引く

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

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class SamplePoi {

    public static void main(String[] args) throws IOException {
        OutputStream os = null;
        try {
            os = new FileOutputStream("TestExcelFile.xlsx");
            XSSFWorkbook workbook = new XSSFWorkbook();
            XSSFSheet sheet = workbook.createSheet("シート1");
            XSSFRow row = sheet.createRow(0);
            XSSFCell cell = row.createCell(0);
            cell.setCellValue("Cell Value");
            XSSFCellStyle style = workbook.createCellStyle();
            XSSFFont font = workbook.createFont();
            font.setStrikeout(true);//ここで取消線を引いています。
            style.setFont(font);
            cell.setCellStyle(style);
            workbook.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                os.close();
            }
        }
    }

}

####4-11.セルの背景色を指定

import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.xssf.usermodel.*;

import java.awt.*;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class SamplePoi {

    public static void main(String[] args) throws IOException {
        OutputStream os = null;
        try {
            os = new FileOutputStream("TestExcelFile.xlsx");
            XSSFWorkbook workbook = new XSSFWorkbook();
            XSSFSheet sheet = workbook.createSheet("シート1");
            XSSFRow row = sheet.createRow(0);
            XSSFCell cell = row.createCell(0);
            cell.setCellValue("Cell Value");
            XSSFCellStyle style = workbook.createCellStyle();
            //style.setFillPattern(CellStyle.BRICKS);
            XSSFColor color = new XSSFColor(Color.RED);
            style.setFillForegroundColor(color);//ここで背景色を指定しています。
            cell.setCellStyle(style);
            workbook.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                os.close();
            }
        }
    }

}

####4-12.値の整列（水平方向）

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

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class SamplePoi {

    public static void main(String[] args) throws IOException {
        OutputStream os = null;
        try {
            os = new FileOutputStream("TestExcelFile.xlsx");
            XSSFWorkbook workbook = new XSSFWorkbook();
            XSSFSheet sheet = workbook.createSheet("シート1");
            XSSFRow row = sheet.createRow(0);
            XSSFCell cell = row.createCell(0);
            cell.setCellValue("Cell Value");
            XSSFCellStyle style = workbook.createCellStyle();
            style.setAlignment(HorizontalAlignment.RIGHT);//ここで値の整列をしています（水平方向）
            cell.setCellStyle(style);
            workbook.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                os.close();
            }
        }
    }

}

####4-13.値の整列（垂直方向）

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

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class SamplePoi {

    public static void main(String[] args) throws IOException {
        OutputStream os = null;
        try {
            os = new FileOutputStream("TestExcelFile.xlsx");
            XSSFWorkbook workbook = new XSSFWorkbook();
            XSSFSheet sheet = workbook.createSheet("シート1");
            XSSFRow row = sheet.createRow(0);
            XSSFCell cell = row.createCell(0);
            cell.setCellValue("Cell Value");
            XSSFCellStyle style = workbook.createCellStyle();
            style.setVerticalAlignment(VerticalAlignment.CENTER);//ここで値の整列をしています（垂直方向）
            cell.setCellStyle(style);
            workbook.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                os.close();
            }
        }
    }

}

####4-14.セルの文字の色を指定

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

import java.awt.*;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class SamplePoi {

    public static void main(String[] args) throws IOException {
        OutputStream os = null;
        try {
            os = new FileOutputStream("TestExcelFile.xlsx");
            XSSFWorkbook workbook = new XSSFWorkbook();
            XSSFSheet sheet = workbook.createSheet("シート1");
            XSSFRow row = sheet.createRow(0);
            XSSFCell cell = row.createCell(0);
            cell.setCellValue("Cell Value");
            XSSFCellStyle style = workbook.createCellStyle();
            XSSFFont font = workbook.createFont();
            XSSFColor color = new XSSFColor(Color.RED);
            font.setColor(color);//ここで文字の色を設定しています。
            style.setFont(font);
            cell.setCellStyle(style);
            workbook.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                os.close();
            }
        }
    }

}

####4-15.セルの枠線を指定

import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.xssf.usermodel.*;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class SamplePoi {

    public static void main(String[] args) throws IOException {
        OutputStream os = null;
        try {
            os = new FileOutputStream("TestExcelFile.xlsx");
            XSSFWorkbook workbook = new XSSFWorkbook();
            XSSFSheet sheet = workbook.createSheet("シート1");
            XSSFRow row = sheet.createRow(1);
            XSSFCell cell = row.createCell(1);
            cell.setCellValue("Cell Value");
            XSSFCellStyle style = workbook.createCellStyle();
            BorderStyle border = BorderStyle.THIN;//ここで枠線の種類を指定しています。
            style.setBorderBottom(border);//下の枠線を指定しています。
            style.setBorderLeft(border);//左の枠線を指定しています。
            style.setBorderRight(border);//右の枠線を指定しています。
            style.setBorderTop(border);//上の枠線を指定しています。
            cell.setCellStyle(style);
            workbook.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                os.close();
            }
        }
    }

}

####4-16.セルの枠線の色を指定

import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.xssf.usermodel.*;
import org.apache.poi.xssf.usermodel.extensions.XSSFCellBorder;

import java.awt.*;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class SamplePoi {

    public static void main(String[] args) throws IOException {
        OutputStream os = null;
        try {
            os = new FileOutputStream("TestExcelFile.xlsx");
            XSSFWorkbook workbook = new XSSFWorkbook();
            XSSFSheet sheet = workbook.createSheet("シート1");
            XSSFRow row = sheet.createRow(1);
            XSSFCell cell = row.createCell(1);
            cell.setCellValue("Cell Value");
            XSSFCellStyle style = workbook.createCellStyle();
            BorderStyle border = BorderStyle.THIN;
            XSSFColor color = new XSSFColor(Color.RED);
            style.setBorderColor(XSSFCellBorder.BorderSide.BOTTOM, color);//ここで枠線の色を指定しています。
            style.setBorderColor(XSSFCellBorder.BorderSide.LEFT, color);
            style.setBorderColor(XSSFCellBorder.BorderSide.RIGHT, color);
            style.setBorderColor(XSSFCellBorder.BorderSide.TOP, color);
            style.setBorderBottom(border);
            style.setBorderLeft(border);
            style.setBorderRight(border);
            style.setBorderTop(border);
            cell.setCellStyle(style);
            workbook.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                os.close();
            }
        }
    }

}

####4-17.セルの折り返しを指定

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

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class SamplePoi {

    public static void main(String[] args) throws IOException {
        OutputStream os = null;
        try {
            os = new FileOutputStream("TestExcelFile.xlsx");
            XSSFWorkbook workbook = new XSSFWorkbook();
            XSSFSheet sheet = workbook.createSheet("シート1");
            XSSFRow row = sheet.createRow(1);
            XSSFCell cell = row.createCell(1);
            cell.setCellValue("Hello World.");
            XSSFCellStyle style = workbook.createCellStyle();
            style.setWrapText(true);//ここで折り返しを指定しています。
            cell.setCellStyle(style);
            workbook.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                os.close();
            }
        }
    }

}

####4-18.セルにハイパーリンクを設定

import org.apache.poi.ss.usermodel.Hyperlink;
import org.apache.poi.xssf.usermodel.*;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class SamplePoi {

    public static void main(String[] args) throws IOException {
        OutputStream os = null;
        try {
            os = new FileOutputStream("TestExcelFile.xlsx");
            XSSFWorkbook workbook = new XSSFWorkbook();
            XSSFSheet sheet = workbook.createSheet("シート1");
            XSSFRow row = sheet.createRow(1);
            XSSFCell cell = row.createCell(1);
            cell.setCellValue("Sample Code Library");
            XSSFCellStyle style = workbook.createCellStyle();
            XSSFHyperlink hyperlink = workbook.getCreationHelper().createHyperlink(Hyperlink.LINK_URL);
            hyperlink.setAddress("http://blueplace.sakura.ne.jp/");
            cell.setHyperlink(hyperlink);//ここでハイパーリンクを指定しています。
            cell.setCellStyle(style);
            workbook.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                os.close();
            }
        }
    }

}

####4-19.セルの結合

import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.*;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class SamplePoi {

    public static void main(String[] args) throws IOException {
        OutputStream os = null;
        try {
            os = new FileOutputStream("TestExcelFile.xlsx");
            XSSFWorkbook workbook = new XSSFWorkbook();
            XSSFSheet sheet = workbook.createSheet("シート1");
            sheet.addMergedRegion(new CellRangeAddress(1, 3, 2, 2));//ここで結合するセルを設定しています。（firstRow, lastRow, firstCol, lastCol）
            workbook.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                os.close();
            }
        }
    }

}