1.创建maven项目
2.在pom文件加入poi依赖
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6<dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>3.7</version> </dependency>
3.写工具类
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180package Test; import java.io.OutputStream; import java.util.ArrayList; import java.util.Arrays; import java.util.List; 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; import org.apache.poi.ss.util.CellRangeAddress; public class ExportExcel { // 显示的导出表的标题 private String title; // 导出表的列名 private String[] rowName; private List<Object[]> dataList = new ArrayList<Object[]>(); // 构造函数,传入要导出的数据 public ExportExcel(String title, String[] rowName, List<Object[]> dataList) { this.dataList = dataList; this.rowName = rowName; this.title = title; } // 导出数据 public void export(OutputStream out) throws Exception { try { HSSFWorkbook workbook = new HSSFWorkbook(); HSSFSheet sheet = workbook.createSheet(title); // 产生表格标题行 HSSFRow rowm = sheet.createRow(0); HSSFCell cellTitle = rowm.createCell(0); //sheet样式定义【】 HSSFCellStyle columnTopStyle=this.getColumnTopStyle(workbook); HSSFCellStyle style=this.getStyle(workbook); sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length - 1))); cellTitle.setCellStyle(columnTopStyle); cellTitle.setCellValue(title); // 定义所需列数 int columnNum = rowName.length; HSSFRow rowRowName = sheet.createRow(2); // 将列头设置到sheet的单元格中 for (int n = 0; n < columnNum; n++) { HSSFCell cellRowName = rowRowName.createCell(n); cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING); HSSFRichTextString text = new HSSFRichTextString(rowName[n]); cellRowName.setCellValue(text); cellRowName.setCellStyle(columnTopStyle); } // 将查询到的数据设置到sheet对应的单元格中 for (int i = 0; i < dataList.size(); i++) { Object[] obj = dataList.get(i);// 遍历每个对象 HSSFRow row = sheet.createRow(i + 3);// 创建所需的行数 for (int j = 0; j < obj.length; j++) { HSSFCell cell = null; if (j == 0) { cell = row.createCell(j, HSSFCell.CELL_TYPE_NUMERIC); cell.setCellValue(i + 1); cell.setCellValue(obj[j].toString()); } else { cell = row.createCell(j, HSSFCell.CELL_TYPE_STRING); if (!"".equals(obj[j]) && obj[j] != null) { cell.setCellValue(obj[j].toString()); } } cell.setCellStyle(style); } } // 让列宽随着导出的列长自动适应 for (int colNum = 0; colNum < columnNum; colNum++) { int columnWidth = sheet.getColumnWidth(colNum) / 256; for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) { HSSFRow currentRow; if (sheet.getRow(rowNum) == null) { currentRow = sheet.createRow(rowNum); } else { currentRow = sheet.getRow(rowNum); } if (currentRow.getCell(colNum) != null) { HSSFCell currentCell = currentRow.getCell(colNum); if (currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING) { int length = currentCell.getStringCellValue().getBytes().length; if (columnWidth < length) { columnWidth = length; } } } } if (colNum == 0) { sheet.setColumnWidth(colNum, (columnWidth - 2) * 256); } else { sheet.setColumnWidth(colNum, (columnWidth + 4) * 256); } } if (workbook != null) { try { workbook.write(out); out.flush(); out.close(); } catch (Exception e) { e.printStackTrace(); } } } catch (Exception e) { } } /* * 列头单元格样式 */ public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) { // 设置字体 HSSFFont font = workbook.createFont(); // 设置字体大小 font.setFontHeightInPoints((short) 11); // 字体加粗 font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); // 设置字体名字 font.setFontName("Courier New"); // 设置样式 HSSFCellStyle style = workbook.createCellStyle(); // 设置低边框 style.setBorderBottom(HSSFCellStyle.BORDER_THIN); // 设置低边框颜色 style.setBottomBorderColor(HSSFColor.BLACK.index); // 设置右边框 style.setBorderRight(HSSFCellStyle.BORDER_THIN); // 设置顶边框 style.setTopBorderColor(HSSFColor.BLACK.index); // 设置顶边框颜色 style.setTopBorderColor(HSSFColor.BLACK.index); // 在样式中应用设置的字体 style.setFont(font); // 设置自动换行 style.setWrapText(false); // 设置水平对齐的样式为居中对齐; style.setAlignment(HSSFCellStyle.ALIGN_CENTER); style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); return style; } public HSSFCellStyle getStyle(HSSFWorkbook workbook) { // 设置字体 HSSFFont font = workbook.createFont(); // 设置字体大小 font.setFontHeightInPoints((short) 10); // 字体加粗 font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); // 设置字体名字 font.setFontName("Courier New"); // 设置样式; HSSFCellStyle style = workbook.createCellStyle(); // 设置底边框; style.setBorderBottom(HSSFCellStyle.BORDER_THIN); // 设置底边框颜色; style.setBottomBorderColor(HSSFColor.BLACK.index); // 设置左边框; style.setBorderLeft(HSSFCellStyle.BORDER_THIN); // 设置左边框颜色; style.setLeftBorderColor(HSSFColor.BLACK.index); // 设置右边框; style.setBorderRight(HSSFCellStyle.BORDER_THIN); // 设置右边框颜色; style.setRightBorderColor(HSSFColor.BLACK.index); // 设置顶边框; style.setBorderTop(HSSFCellStyle.BORDER_THIN); // 设置顶边框颜色; style.setTopBorderColor(HSSFColor.BLACK.index); // 在样式用应用设置的字体; style.setFont(font); // 设置自动换行; style.setWrapText(false); // 设置水平对齐的样式为居中对齐; style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 设置垂直对齐的样式为居中对齐; style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); return style; } }
4.写测试类
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24package Test; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.OutputStream; import java.util.ArrayList; import java.util.List; public class Test { public static void main(String[] args) throws Exception { // TODO Auto-generated method stub Object[] object1= {"tom",1}; Object[] object2= {"lili",2}; List<Object[]> list=new ArrayList<Object[]>(); list.add(object1); list.add(object2); String[] rowName= new String[]{"名字","年龄"}; ExportExcel exportExcel=new ExportExcel("Excel导出", rowName, list); File file=new File("D://b.xls"); FileOutputStream out=new FileOutputStream(file); exportExcel.export(out); System.out.println("成功"); } }
需要我们用的时候只需要
1.新建new ExportExcel(“Excel导出”, rowName, list);
第一个参数为表格标题,第二个参数为列名,第三个参数为数据,list放的是一个一个的数组,每一个数组为一行数据。
2. 指定文件位置
File file=new File(“D://b.xls”);
FileOutputStream out=new FileOutputStream(file);
3.调用ExportExcel的export(out)方法
后来发现如果不需要表格标题就不适用了,于是我在原有的基础上对ExportExcel的export(out)方法进行了改进,可以自动进行判断有没有标题
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196package Test; import java.io.OutputStream; import java.util.ArrayList; import java.util.Arrays; import java.util.List; 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; import org.apache.poi.ss.util.CellRangeAddress; public class ExportExcel { // 显示的导出表的标题 private String title; // 导出表的列名 private String[] rowName; private List<Object[]> dataList = new ArrayList<Object[]>(); // 构造函数,传入要导出的数据 public ExportExcel(String title, String[] rowName, List<Object[]> dataList) { this.dataList = dataList; this.rowName = rowName; this.title = title; } // 导出数据 public void export(OutputStream out) throws Exception { try { int r=0;//列名 HSSFWorkbook workbook = new HSSFWorkbook(); //sheet样式定义【】 HSSFCellStyle columnTopStyle=this.getColumnTopStyle(workbook); HSSFCellStyle style=this.getStyle(workbook); HSSFSheet sheet=workbook.createSheet(); if(title==null) { }else { // 产生表格标题行 HSSFRow rowm = sheet.createRow(0); HSSFCell cellTitle = rowm.createCell(0); sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length - 1))); cellTitle.setCellStyle(columnTopStyle); cellTitle.setCellValue(title); r=2;//列在第几行 } // 定义所需列数 int columnNum = rowName.length; HSSFRow rowRowName = sheet.createRow(r); // 将列头设置到sheet的单元格中 for (int n = 0; n < columnNum; n++) { HSSFCell cellRowName = rowRowName.createCell(n); cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING); HSSFRichTextString text = new HSSFRichTextString(rowName[n]); cellRowName.setCellValue(text); cellRowName.setCellStyle(columnTopStyle); } // 将查询到的数据设置到sheet对应的单元格中 for (int i = 0; i < dataList.size(); i++) { Object[] obj = dataList.get(i);// 遍历每个对象 HSSFRow row=null; if(title==null) { row = sheet.createRow(i+1);// 创建行数 }else { row = sheet.createRow(i + 3);// 创建行数 } for (int j = 0; j < obj.length; j++) { HSSFCell cell =row.createCell(j, HSSFCell.CELL_TYPE_NUMERIC); if (!"".equals(obj[j]) && obj[j] != null) { cell.setCellValue(obj[j].toString()); }else { cell.setCellValue("null"); } /* if (j == 0) { cell = row.createCell(j, HSSFCell.CELL_TYPE_NUMERIC); cell.setCellValue(i + 1); cell.setCellValue(obj[j].toString()); } else { cell = row.createCell(j, HSSFCell.CELL_TYPE_STRING); if (!"".equals(obj[j]) && obj[j] != null) { cell.setCellValue(obj[j].toString()); } }*/ cell.setCellStyle(style); } } columnNum = rowName.length; // 让列宽随着导出的列长自动适应 for (int colNum = 0; colNum < columnNum; colNum++) { int columnWidth = sheet.getColumnWidth(colNum) / 256; for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) { HSSFRow currentRow; if (sheet.getRow(rowNum) == null) { currentRow = sheet.createRow(rowNum); } else { currentRow = sheet.getRow(rowNum); } if (currentRow.getCell(colNum) != null) { HSSFCell currentCell = currentRow.getCell(colNum); if (currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING) { int length = currentCell.getStringCellValue().getBytes().length; if (columnWidth < length) { columnWidth = length; } } } } if (colNum == 0) { sheet.setColumnWidth(colNum, (columnWidth - 2) * 256); } else { sheet.setColumnWidth(colNum, (columnWidth + 4) * 256); } } if (workbook != null) { try { workbook.write(out); out.flush(); out.close(); } catch (Exception e) { e.printStackTrace(); } } } catch (Exception e) { } } /* * 列头单元格样式 */ public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) { // 设置字体 HSSFFont font = workbook.createFont(); // 设置字体大小 font.setFontHeightInPoints((short) 11); // 字体加粗 font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); // 设置字体名字 font.setFontName("Courier New"); // 设置样式 HSSFCellStyle style = workbook.createCellStyle(); // 设置低边框 style.setBorderBottom(HSSFCellStyle.BORDER_THIN); // 设置低边框颜色 style.setBottomBorderColor(HSSFColor.BLACK.index); // 设置右边框 style.setBorderRight(HSSFCellStyle.BORDER_THIN); // 设置顶边框 style.setTopBorderColor(HSSFColor.BLACK.index); // 设置顶边框颜色 style.setTopBorderColor(HSSFColor.BLACK.index); // 在样式中应用设置的字体 style.setFont(font); // 设置自动换行 style.setWrapText(false); // 设置水平对齐的样式为居中对齐; style.setAlignment(HSSFCellStyle.ALIGN_CENTER); style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); return style; } public HSSFCellStyle getStyle(HSSFWorkbook workbook) { // 设置字体 HSSFFont font = workbook.createFont(); // 设置字体大小 font.setFontHeightInPoints((short) 10); // 字体加粗 font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); // 设置字体名字 font.setFontName("Courier New"); // 设置样式; HSSFCellStyle style = workbook.createCellStyle(); // 设置底边框; style.setBorderBottom(HSSFCellStyle.BORDER_THIN); // 设置底边框颜色; style.setBottomBorderColor(HSSFColor.BLACK.index); // 设置左边框; style.setBorderLeft(HSSFCellStyle.BORDER_THIN); // 设置左边框颜色; style.setLeftBorderColor(HSSFColor.BLACK.index); // 设置右边框; style.setBorderRight(HSSFCellStyle.BORDER_THIN); // 设置右边框颜色; style.setRightBorderColor(HSSFColor.BLACK.index); // 设置顶边框; style.setBorderTop(HSSFCellStyle.BORDER_THIN); // 设置顶边框颜色; style.setTopBorderColor(HSSFColor.BLACK.index); // 在样式用应用设置的字体; style.setFont(font); // 设置自动换行; style.setWrapText(false); // 设置水平对齐的样式为居中对齐; style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 设置垂直对齐的样式为居中对齐; style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); return style; } }
测试代码:
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25package Test; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.OutputStream; import java.util.ArrayList; import java.util.List; public class Test { public static void main(String[] args) throws Exception { // TODO Auto-generated method stub Object[] object1= {"tom",1}; Object[] object2= {"lili",2}; List<Object[]> list=new ArrayList<Object[]>(); list.add(object1); list.add(object2); String[] rowName= new String[]{"名字","年龄"}; //ExportExcel exportExcel=new ExportExcel("Excel导出", rowName, list); ExportExcel exportExcel=new ExportExcel(null, rowName, list); File file=new File("D://b.xls"); FileOutputStream out=new FileOutputStream(file); exportExcel.export(out); System.out.println("成功"); } }
这样就可以写标题也可以不写标题了;
最后
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