POI设置Excel的格式 字体样式 美化

POI设置Excel的格式 字体样式 美化


import java.io.FileOutputStream;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
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;

/**
*
* @author hadeslee
*/
public class Test2{
   
    /** Creates a new instance of Test2 */
    public Test2() {
     }
    public static void main(String[] args)throws Exception {
        //声明一个工作薄
         HSSFWorkbook wb=new HSSFWorkbook();
        //生成一个表格
         HSSFSheet sheet=wb.createSheet("表格1");
        //生成一个列
         HSSFRow row=sheet.createRow(0);
        //生成一个样式
         HSSFCellStyle style=wb.createCellStyle();
        //设置这些样式
         style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);
         style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
         style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
         style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
         style.setBorderRight(HSSFCellStyle.BORDER_THIN);
         style.setBorderTop(HSSFCellStyle.BORDER_THIN);
         style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        //生成一个字体
         HSSFFont font=wb.createFont();
         font.setColor(HSSFColor.VIOLET.index);
         font.setFontHeightInPoints((short)16);
         font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        //把字体应用到当前的样式
         style.setFont(font);
        //填充单元格
        for(short i=0;i<5;i++){
            //声明一个单元格
             HSSFCell cell=row.createCell(i);
            //设置单元格的字符值
             cell.setCellValue(new HSSFRichTextString("第"+i+"列"));
            //设置单元格的样式
             cell.setCellStyle(style);
         }
         FileOutputStream fout=new FileOutputStream("我的第一个EXCEL.xls");
        //输出到文件
         wb.write(fout);
         fout.close();
     }
}


public static void main(String[] args) {
        try {
             HSSFWorkbook wb = new HSSFWorkbook();
             HSSFSheet sheet = wb.createSheet();
             HSSFRow row = sheet.createRow(0);
             row.setHeight((short) 25);//目的是想把行高设置成25px
             FileOutputStream fileOut = new FileOutputStream("c:\\a.xls");
             wb.write(fileOut);
             fileOut.close();
         }
        catch (Exception e) {
             e.printStackTrace();
         }
     }

打开a.xls发现结果不是我想要的，第一行的高度都没有，没有报错说明代码有问题，为什么回没有高度呢？是不是单位不一样呢？我把row.setHeight((short) 25);改成了row.setHeight((short) 250);结果发现第一行出来了，但是这是怎么一个换算关系呢？我查看了一下导出的Excel第一行高是16像素，换算一下得出row.setHeight((short) 15.625);表示行高为一个像素，那么想设成几个像素就好做了。比如
row.setHeight((short) (15.625*n));//n为行高的像素数。
其实在API中还有一个HSSFRow 对象还有一个设置行高的函数setHeightInPoints(float height);这个函数中参数就是行高的像素数，比setHeight函数要方便多了。
行高设置完成了，接下来设置列宽

    public static void main(String[] args) {
        try {
             HSSFWorkbook wb = new HSSFWorkbook();
             HSSFSheet sheet = wb.createSheet();
             HSSFRow row = sheet.createRow(0);
             row.setHeight((short) 250);
             sheet.setColumnWidth((short) 0, (short) 250);
             FileOutputStream fileOut = new FileOutputStream("c:\\a.xls");
             wb.write(fileOut);
             fileOut.close();
         }
        catch (Exception e) {
             e.printStackTrace();
         }
     }
接下来说说sheet.setColumnWidth((short) 0, (short) 250);
第一个参数表示要为第几列设置，第二个参数表示列的宽度，看看上面的代码按说第一行第一列的单元格形状应该是个正方形，因为宽和高都是250，但是打开导出后的Excel发现宽度没有高度大，是个长方形，查看该列的宽度仅为7个像素，看来行高和列宽的单位是不一样的，同样换一算sheet.setColumnWidth((short) 0, (short) (35.7));表示高度为一个像素，同样设置列宽的像素为sheet.setColumnWidth((short) 0, (short) (35.7*n));//n为列高的像素数。


public class MergedCells {
     public static void main(String[] args) throws IOException {
         HSSFWorkbook wb = new HSSFWorkbook();
         HSSFSheet sheet = wb.createSheet("new sheet");

         HSSFRow row = sheet.createRow((short) 1);
         HSSFCell cell = row.createCell((short) 1);
         cell.setCellValue("This is a test of merging");

         sheet.addMergedRegion(new Region(1, (short) 1, 1, (short) 2));

         // Write the output to a file
         FileOutputStream fileOut = new FileOutputStream("workbook.xls");
         wb.write(fileOut);
         fileOut.close();

     }
}


public class WorkingWithFonts {
     public static void main(String[] args) throws IOException {
         HSSFWorkbook wb = new HSSFWorkbook();
         HSSFSheet sheet = wb.createSheet("new sheet");

         // Create a row and put some cells in it. Rows are 0 based.
         HSSFRow row = sheet.createRow((short) 1);

         // Create a new font and alter it.
         HSSFFont font = wb.createFont();
         font.setFontHeightInPoints((short) 24);
         font.setFontName("Courier New");
         font.setItalic(true);
         font.setStrikeout(true);

         // Fonts are set into a style so create a new one to use.
         HSSFCellStyle style = wb.createCellStyle();
         style.setFont(font);

         // Create a cell and put a value in it.
         HSSFCell cell = row.createCell((short) 1);
         cell.setCellValue("This is a test of fonts");
         cell.setCellStyle(style);

         // Write the output to a file
         FileOutputStream fileOut = new FileOutputStream("workbook.xls");
         wb.write(fileOut);
         fileOut.close();

     }
}



HSSFRow row = sheet2.createRow(2);
         row.setHeightInPoints(240);
         sheet2.setColumnWidth((short) 2, (short) 9000);