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java使用poi導(dǎo)出Excel的方法

發(fā)布時(shí)間:2020-10-07 09:42:40 來源:腳本之家 閱讀:169 作者:輸入密碼 欄目:編程語言

本文實(shí)例為大家分享了java使用poi導(dǎo)出Excel的具體代碼,供大家參考,具體內(nèi)容如下

package hyss.util.common;

import java.io.IOException;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.ArrayList;
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;

/**
 * Excel導(dǎo)出工具類
 * @author ts
 */

public class ExportExcelUtil {
 //顯示的導(dǎo)出表的標(biāo)題
 private String title;
 //導(dǎo)出表的列名
 private String[] rowName ;
 
 private List<Object[]> dataList = new ArrayList<Object[]>();
 
// HttpServletResponse response;
 
 //構(gòu)造方法,傳入要導(dǎo)出的數(shù)據(jù)
 public ExportExcelUtil(String title,String[] rowName,List<Object[]> dataList){
  this.dataList = dataList;
  this.rowName = rowName;
  this.title = title;
 }
   
 /*
  * 導(dǎo)出數(shù)據(jù)
  * */
 public void export() throws Exception{
  try{
   HSSFWorkbook workbook = new HSSFWorkbook();      // 創(chuàng)建工作簿對(duì)象
   HSSFSheet sheet = workbook.createSheet(title);      // 創(chuàng)建工作表
   
   // 產(chǎn)生表格標(biāo)題行
   HSSFRow rowm = sheet.createRow(0);
   HSSFCell cellTiltle = rowm.createCell(0);
   rowm.setHeightInPoints(25);           //設(shè)置標(biāo)題行默認(rèn)行高
   
   //sheet樣式定義【getColumnTopStyle()/getStyle()均為自定義方法 - 在下面 - 可擴(kuò)展】
   HSSFCellStyle columnTitleStyle = this.getTitleTopStyle(workbook);//獲取標(biāo)題行樣式
   HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook); //獲取列頭樣式對(duì)象
   HSSFCellStyle style = this.getStyle(workbook);     //單元格樣式對(duì)象
   
   sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length-1))); 
   cellTiltle.setCellStyle(columnTitleStyle);
   cellTiltle.setCellValue(title);
   
   // 定義所需列數(shù)
   int columnNum = rowName.length;
   HSSFRow rowRowName = sheet.createRow(2);    // 在索引2的位置創(chuàng)建行(最頂端的行開始的第二行)
   rowRowName.setHeightInPoints(25);       //將列頭設(shè)置默認(rèn)行高
   // 將列頭設(shè)置到sheet的單元格中
   for(int n=0;n<columnNum;n++){
    HSSFCell cellRowName = rowRowName.createCell(n);    //創(chuàng)建列頭對(duì)應(yīng)個(gè)數(shù)的單元格
    cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING);    //設(shè)置列頭單元格的數(shù)據(jù)類型
    HSSFRichTextString text = new HSSFRichTextString(rowName[n]);
    cellRowName.setCellValue(text);         //設(shè)置列頭單元格的值
    cellRowName.setCellStyle(columnTopStyle);      //設(shè)置列頭單元格樣式
   }
   
   //將查詢出的數(shù)據(jù)設(shè)置到sheet對(duì)應(yīng)的單元格中
   for(int i=0;i<dataList.size();i++){
    
    Object[] obj = dataList.get(i);//遍歷每個(gè)對(duì)象
    HSSFRow row = sheet.createRow(i+3);//創(chuàng)建所需的行數(shù)
    row.setHeightInPoints(20); //將創(chuàng)建出的行設(shè)置默認(rèn)行高
    for(int j=0; j<obj.length; j++){
     HSSFCell cell = null; //設(shè)置單元格的數(shù)據(jù)類型
     if(j == 0){
      cell = row.createCell(j,HSSFCell.CELL_TYPE_NUMERIC);
      cell.setCellValue(i+1); 
     }else{
      cell = row.createCell(j,HSSFCell.CELL_TYPE_STRING);
      if(!"".equals(obj[j]) && obj[j] != null){
       cell.setCellValue(obj[j].toString());      //設(shè)置單元格的值
      }
     }
     cell.setCellStyle(style);         //設(shè)置單元格樣式
    }
   }
   //讓列寬隨著導(dǎo)出的列長自動(dòng)適應(yīng)
   for (int colNum = 0; colNum < columnNum; colNum++) {
    int columnWidth = sheet.getColumnWidth(colNum) / 256;
    for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) {
     HSSFRow currentRow;
     //當(dāng)前行未被使用過
     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
    {
     String fileName = title + DateTime.getSystemDateTime("yyyy-MM-dd") + ".xls";
             //因 response已經(jīng)封裝成工具類所以下面這段代碼注釋掉
//     response =ServletActionContext.getResponse();
//     response.setContentType("APPLICATION/OCTET-STREAM");
//     response.setHeader("Content-Disposition", headStr);
//     OutputStream out = response.getOutputStream();
     
     //解決中文亂碼 
     Struts2Util.getResponse().setCharacterEncoding("UTF-8");
     //解決中文亂碼
     Struts2Util.getResponse().setHeader("Content-Disposition", "attachment;filename*=UTF-8''" + URLEncoder.encode(fileName,"UTF-8"));
     //文件下載
     Struts2Util.getResponse().setContentType("APPLICATION/OCTET-STREAM");
     OutputStream out = Struts2Util.getResponse().getOutputStream();
     workbook.write(out);
    }
    catch (IOException e)
    {
     e.printStackTrace();
    }
   }

  }catch(Exception e){
   e.printStackTrace();
  }
  
 }
 
 /* 
  * 設(shè)置標(biāo)題樣式
  */ 
  public HSSFCellStyle getTitleTopStyle(HSSFWorkbook workbook) {
   
   // 設(shè)置字體
   HSSFFont font = workbook.createFont();
   //設(shè)置字體大小
   font.setFontHeightInPoints((short)24);
   //字體加粗
   font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
   //設(shè)置字體名字 
   font.setFontName("宋體");
   //設(shè)置樣式; 
   HSSFCellStyle style = workbook.createCellStyle();
   //設(shè)置底邊框; 
   style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
   //設(shè)置底邊框顏色; 
   style.setBottomBorderColor(HSSFColor.BLACK.index);
   //設(shè)置左邊框; 
   style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
   //設(shè)置左邊框顏色; 
   style.setLeftBorderColor(HSSFColor.BLACK.index);
   //設(shè)置右邊框; 
   style.setBorderRight(HSSFCellStyle.BORDER_THIN);
   //設(shè)置右邊框顏色; 
   style.setRightBorderColor(HSSFColor.BLACK.index);
   //設(shè)置頂邊框; 
   style.setBorderTop(HSSFCellStyle.BORDER_THIN);
   //設(shè)置頂邊框顏色; 
   style.setTopBorderColor(HSSFColor.BLACK.index);
   //在樣式用應(yīng)用設(shè)置的字體; 
   style.setFont(font);
   //設(shè)置自動(dòng)換行; 
   style.setWrapText(false);
   //設(shè)置水平對(duì)齊的樣式為居中對(duì)齊; 
   style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
   //設(shè)置垂直對(duì)齊的樣式為居中對(duì)齊; 
   style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
   
   return style;
   
  }
 
 
 /* 
  * 列頭單元格樣式
  */ 
  public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) {
   
   // 設(shè)置字體
   HSSFFont font = workbook.createFont();
   //設(shè)置字體大小
   font.setFontHeightInPoints((short)11);
   //字體加粗
   font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
   //設(shè)置字體名字 
   font.setFontName("宋體");
   //設(shè)置樣式; 
   HSSFCellStyle style = workbook.createCellStyle();
   //設(shè)置底邊框; 
   style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
   //設(shè)置底邊框顏色; 
   style.setBottomBorderColor(HSSFColor.BLACK.index);
   //設(shè)置左邊框; 
   style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
   //設(shè)置左邊框顏色; 
   style.setLeftBorderColor(HSSFColor.BLACK.index);
   //設(shè)置右邊框; 
   style.setBorderRight(HSSFCellStyle.BORDER_THIN);
   //設(shè)置右邊框顏色; 
   style.setRightBorderColor(HSSFColor.BLACK.index);
   //設(shè)置頂邊框; 
   style.setBorderTop(HSSFCellStyle.BORDER_THIN);
   //設(shè)置頂邊框顏色; 
   style.setTopBorderColor(HSSFColor.BLACK.index);
   //在樣式用應(yīng)用設(shè)置的字體; 
   style.setFont(font);
   //設(shè)置自動(dòng)換行; 
   style.setWrapText(false);
   //設(shè)置水平對(duì)齊的樣式為居中對(duì)齊; 
   style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
   //設(shè)置垂直對(duì)齊的樣式為居中對(duì)齊; 
   style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
   
   return style;
   
  }
  
  /* 
  * 列數(shù)據(jù)信息單元格樣式
  */ 
  public HSSFCellStyle getStyle(HSSFWorkbook workbook) {
   // 設(shè)置字體
   HSSFFont font = workbook.createFont();
   //設(shè)置字體大小
   //font.setFontHeightInPoints((short)10);
   //字體加粗
   //font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
   //設(shè)置字體名字 
   font.setFontName("宋體");
   //設(shè)置樣式; 
   HSSFCellStyle style = workbook.createCellStyle();
   //設(shè)置底邊框; 
   style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
   //設(shè)置底邊框顏色; 
   style.setBottomBorderColor(HSSFColor.BLACK.index);
   //設(shè)置左邊框; 
   style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
   //設(shè)置左邊框顏色; 
   style.setLeftBorderColor(HSSFColor.BLACK.index);
   //設(shè)置右邊框; 
   style.setBorderRight(HSSFCellStyle.BORDER_THIN);
   //設(shè)置右邊框顏色; 
   style.setRightBorderColor(HSSFColor.BLACK.index);
   //設(shè)置頂邊框; 
   style.setBorderTop(HSSFCellStyle.BORDER_THIN);
   //設(shè)置頂邊框顏色; 
   style.setTopBorderColor(HSSFColor.BLACK.index);
   //在樣式用應(yīng)用設(shè)置的字體; 
   style.setFont(font);
   //設(shè)置自動(dòng)換行; 
   style.setWrapText(false);
   //設(shè)置水平對(duì)齊的樣式為居中對(duì)齊; 
//   style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
   //設(shè)置垂直對(duì)齊的樣式為居中對(duì)齊; 
//   style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
   
   
   return style;
  
  }
 
}

實(shí)現(xiàn)方法

/*
* 實(shí)現(xiàn)方法
*/
public void exportExcel() throws Exception{
  String title = "測試";
  String[] rowsName = new String[]{"序號(hào)","列頭1","列頭2","列頭3","列頭4","列頭5"};
  List<Object[]> dataList = new ArrayList<Object[]>();
  Object[] objs = null;
  for (int i = 0; i < 10; i++) {
   objs = new Object[rowsName.length];
   objs[0] = i;
   objs[1] = "測試1";
   objs[2] = "測試2";
   objs[3] = "測試3";
   objs[4] = "測試4";
   objs[5] = "測試5";
   dataList.add(objs);
  }
  ExportExcelUtil ex = new ExportExcelUtil(title, rowsName, dataList);
  ex.export();
  
 }

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