java使用poi导出excel例子
java导出某个页签：
第一步：先在jsp新建一个导出界面按钮：
导出
第二步：在js中新建导出方法：
//导出数据到EXCEL表
function exportexcel(){
var rows1 = treegrid.getRootNode();
var rows = rows1.children;
var bi_id = "";
for(var i = 0 ;i
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet.
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String bi_id = request.getParameter("bi_id");
String dp = request.getParameter("dp");
bi_id=bi_id.replace("＇","'");
String year = dp.substring(0,4);
String date = dp.substring(5,7);
String sql = "SELECT a.bi_name,a.bi_id,a.bi_code,a.bi_no,a.bi_build_type,c.BUILD_STAGE,a.BI_BUDGET_NO,a.BI_BEGIN_DATE,a.BI_PID,a.BI_LEVEL,b.BI_TOTAL_INVEST,b.BI_PLAN_INVEST,d.START_DATE,d.PAUSE_DATE FROM " ;
sql +="(select rownum px,bi_name,bi_id,bi_code,bi_no,bi_build_type,BI_BUDGET_NO,BI_BUDGET_APPROVAL,BI_BEGIN_DATE,BI_PID,BI_LEVEL from project_library start with bi_id in (" + bi_id + ") connect by prior bi_id = bi_pid order siblings by bi_no) a ";
sql +=" left join (SELECT * FROM project_report where report_date ='" +date +"' and report_year = '"+year+"' and project_id in(SELECT bi_id FROM project_library where bi_type = 7)) b on b.project_id = a.bi_id ";
sql +=" left join (SELECT DECODE(BUILD_STAGE,0,'预留空',1,'本年新建项目',2,'本年续建项目',3,'投运项目') BUILD_STAGE,bi_id FROM project_stage_config where bi_id in (SELECT bi_id FROM project_library where bi_type = 7)and build_date = '"+year+"') c on a.bi_id = c.bi_id ";
sql +=" left join (select substr(start_date, 1, 10) start_date,substr(pause_date, 1,10) pause_date,bi_id from (select bi_id, max(start_date) start_date,max(pause_date) pause_date from project_cycle_config group by bi_id, pause_date) ";
sql +=" where substr(start_date, 1, 7) <= '"+dp+"' and substr(nvl(pause_date, '9999-12-31'), 1, 7) >= '"+dp+"' and bi_id in(SELECT bi_id FROM project_library where bi_type = 7)) d on a.bi_id = d.bi_id ";
sql += " where a.bi_level in (0,1) or a.bi_id in(select pcc.bi_id from project_cycle_config pcc where substr(pcc.start_date, 1, 7) <= '"+dp+"' and substr(nvl(pcc.pause_date, '9999-12-31'),1,7) >= '"+dp+"') order by a.px";
ResultSet rs;
try {
rs = DbOper.executeQuery(sql);
List> rows = new ArrayList>();
while (rs.next()) {
Map row = new HashMap();
for (int i = 1; i <= rs.getMetaData().getColumnCount(); i++) {
row.put(rs.getMetaData().getColumnName(i).toUpperCase(),
rs.getObject(i));
}
rows.add(row);
}
String [][] BiaoTi = {
{"项目ID","父ID","层级","项目名称","项目唯一编码","项目排序编码","建设类型","建设阶段","概（预）算批准文号","开工日期","计划投资","","项目录入及终止时间",""},
{"","","","","","","","","","","计划总投资","本年计划投资","开始时间","停缓时间"},
{"BI_ID","BI_PID","BI_LEVEL","BI_NAME","BI_CODE","BI_NO","BI_BUILD_TYPE","BUILD_STAGE","BI_BUDGET_NO","BI_BEGIN_DATE","BI_TOTAL_INVEST","BI_PLAN_INVEST","START_DATE","PAUSE_DATE"}
};
SXSSFWorkbook workbook = rpexper.exportExcel(BiaoTi,rows,"");
String title = "生产技改项目";
String fileName = title + "-项目基本信息" +".xlsx";
fileName = new String(fileName.getBytes("GBK"), "ISO-8859-1"); // 取消乱码
response.setContentType("octets/stream");
response.addHeader("Content-Disposition", "attachment;filename="
+ fileName);
OutputStream out = response.getOutputStream();
workbook.write(out);
out.close();
System.out.println("导出Excel");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* The doPost method of the servlet.
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("");
out.println("");
out.println(" A Servlet ");
out.println(" ");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the POST method");
out.println(" ");
out.println("");
out.flush();
out.close();
}
}
第四步：由于第三步引用了这个文件;TechnicalProjectExporter()来画表，所以加上这个文件：
package gdzc2015.service.projectTechnical.projectTechnicalExpXls;
import gdzc2015.common.excel.reader.Interface.IExporter;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletException;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.DataFormat;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.PrintSetup;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFFont;
import org.apache.poi.xssf.usermodel.XSSFSheet;
public class TechnicalProjectExporter implements IExporter{
/**
* Initialization of the servlet.
*
* @throws ServletException if an error occurs
*/
public SXSSFWorkbook exportExcel(String[][] BiaoTi,List> rows,String curDate){
SXSSFWorkbook workbook = new SXSSFWorkbook(); // 创建工作薄，相当于一个文件
Sheet sheet = workbook.createSheet(); // 创建一个表
//sheet.setDefaultColumnWidth((short) 3); // 设置默认列宽
//sheet.setColumnWidth(0, 18 * 256); // 设置单位列列宽
sheet.setMargin(XSSFSheet.TopMargin, 0.64); // 页边距（上）
sheet.setMargin(XSSFSheet.BottomMargin, 0.64); // 页边距（下）
sheet.setMargin(XSSFSheet.LeftMargin, 0.64); // 页边距（左）
sheet.setMargin(XSSFSheet.RightMargin, 0.64); // 页边距（右）
PrintSetup ps = sheet.getPrintSetup();
ps.setPaperSize(PrintSetup.A4_PAPERSIZE); // 设置纸张大小
ps.setLandscape(true); // 打印方向，true：横向，false：纵向(默认)
// 标题样式
CellStyle titleStyle = workbook.createCellStyle();
titleStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER); // 水平居中
titleStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER); // 垂直居中
// 标题字体
Font titleFont = workbook.createFont();
titleFont.setFontHeightInPoints((short) 14); // 字体大小
titleFont.setFontName("宋体");
titleStyle.setFont(titleFont);
// 填报单位的样式
CellStyle titleStyle_2 = workbook.createCellStyle();
titleStyle_2.setAlignment(XSSFCellStyle.ALIGN_RIGHT); // 水平居右
titleStyle_2.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER); // 垂直居中
// 标题字体
Font titleFont_2 = workbook.createFont();
titleFont_2.setFontHeightInPoints((short) 11);
titleFont_2.setFontName("宋体");
titleStyle_2.setFont(titleFont_2);
// 填报单位的样式
CellStyle titleStyle_u = workbook.createCellStyle();
titleStyle_u.setAlignment(XSSFCellStyle.ALIGN_LEFT); // 水平居左
titleStyle_u.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER); // 垂直居中
// 标题字体
Font titleFont_u = workbook.createFont();
titleFont_u.setUnderline(XSSFFont.U_SINGLE);
titleFont_u.setFontHeightInPoints((short) 11);
titleFont_u.setFontName("宋体");
titleStyle_u.setFont(titleFont_u);
// 表头样式
CellStyle headerStyle = workbook.createCellStyle();
headerStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER); // 水平居中
headerStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER); // 垂直居中
headerStyle.setBorderBottom(XSSFCellStyle.BORDER_THIN); // 下边框
headerStyle.setBorderLeft(XSSFCellStyle.BORDER_THIN); // 左边框
headerStyle.setBorderTop(XSSFCellStyle.BORDER_THIN); // 上边框
headerStyle.setBorderRight(XSSFCellStyle.BORDER_THIN); // 右边框
headerStyle.setWrapText(true); // 设置多行显示
//这两句话是表示将表头单元格格式设置为文本型，在后面只要调用-----.setDataFormat(format.getFormat("@"))的方法就可以将数据设置为文本型。
DataFormat format = workbook.createDataFormat();
headerStyle.setDataFormat(format.getFormat("@"));
// 表头字体
Font headerFont = workbook.createFont();
headerFont.setFontHeightInPoints((short) 9);
headerFont.setFontName("宋体");
headerStyle.setFont(headerFont);
// 数据样式
CellStyle dataStyle = workbook.createCellStyle();
dataStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER); // 水平居中
dataStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER); // 垂直居中
dataStyle.setBorderBottom(XSSFCellStyle.BORDER_THIN); // 下边框
dataStyle.setBorderLeft(XSSFCellStyle.BORDER_THIN); // 左边框
dataStyle.setBorderTop(XSSFCellStyle.BORDER_THIN); // 上边框
dataStyle.setBorderRight(XSSFCellStyle.BORDER_THIN); // 右边框
dataStyle.setDataFormat(format.getFormat("@")); //将数据单元格格式设置为文本类型
// 数据字体
Font dataFont = workbook.createFont();
dataFont.setFontHeightInPoints((short) 9);
dataFont.setFontName("宋体");
dataStyle.setFont(dataFont);
// 尾部样式
CellStyle footStyle = workbook.createCellStyle();
footStyle.setAlignment(XSSFCellStyle.ALIGN_LEFT); // 水平居中
footStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER); // 垂直居中
// 尾部字体
Font footFont = workbook.createFont();
footFont.setFontHeightInPoints((short) 11);
footFont.setFontName("宋体");
footStyle.setFont(footFont);
CellStyle commonStyle = workbook.createCellStyle();
commonStyle.setBorderBottom(XSSFCellStyle.BORDER_THIN); // 下边框
commonStyle.setBorderLeft(XSSFCellStyle.BORDER_THIN); // 左边框
commonStyle.setBorderTop(XSSFCellStyle.BORDER_THIN); // 上边框
commonStyle.setBorderRight(XSSFCellStyle.BORDER_THIN); // 右边框
String tbdwmc = "";
String shr = "";
String tbr = "";
Object obj = rows.size()==0?"":rows.get(0).get("CREATEORG");
tbdwmc = obj==null?"":obj.toString();
String title = "生产技改项目";
// 表格标题行
Row row0 = sheet.createRow(0);
row0.setHeight((short)(3 * 256));
Cell cell0_0 = row0.createCell(0); // 创建单元格，参数说明的是第几个单元格
cell0_0.setCellStyle(titleStyle);
cell0_0.setCellValue(title); // 设置单元格 和里面的内容
Row row1 = sheet.createRow(1);
row1.setHeight((short) (2 * 256));
Cell cell1_0 = row1.createCell(0); // 创建单元格，参数说明的是第几个单元格
cell1_0.setCellStyle(titleStyle_2);
cell1_0.setCellValue("填报单位: "); // 设置单元格 和里面的内容
Cell cell1_2 = row1.createCell(2); // 创建单元格，参数说明的是第几个单元格
cell1_2.setCellStyle(titleStyle_u);
cell1_2.setCellValue(tbdwmc); // 设置单元格 和里面的内容
sheet.setColumnWidth(0, 40*256);
sheet.setColumnWidth(1, 40*256);
sheet.setColumnWidth(2, 40*256);
sheet.setColumnWidth(3, 40*256);
sheet.setColumnWidth(4, 30*256);
sheet.setColumnWidth(5, 30*256);
Row row = null;
Cell cell = null;
for(int i = 2 ; i<5 ; i++){
row = sheet.createRow(i);
row.setHeight((short)(2 * 256));
for(int j = 0 ;j < BiaoTi[i-2].length;j++){
cell = row.createCell(j);
cell.setCellValue(BiaoTi[i-2][j]);
cell.setCellStyle(headerStyle);
}
}
sheet.getRow(4).setZeroHeight(true);
// 合并单元格
sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, 13)); // 合并大标题行
sheet.addMergedRegion(new CellRangeAddress(1, 1, 0, 3));
sheet.addMergedRegion(new CellRangeAddress(1, 1, 4, 13));
sheet.addMergedRegion(new CellRangeAddress(2, 3, 0, 0));
sheet.addMergedRegion(new CellRangeAddress(2, 3, 1, 1));
sheet.addMergedRegion(new CellRangeAddress(2, 3, 2, 2));
sheet.addMergedRegion(new CellRangeAddress(2, 3, 3, 3));
sheet.addMergedRegion(new CellRangeAddress(2, 3, 4, 4));
sheet.addMergedRegion(new CellRangeAddress(2, 3, 5, 5));
sheet.addMergedRegion(new CellRangeAddress(2, 3, 6, 6));
sheet.addMergedRegion(new CellRangeAddress(2, 3, 7, 7));
sheet.addMergedRegion(new CellRangeAddress(2, 3, 8, 8));
sheet.addMergedRegion(new CellRangeAddress(2, 3, 9, 9));
sheet.addMergedRegion(new CellRangeAddress(2, 2, 10, 11));
sheet.addMergedRegion(new CellRangeAddress(2, 2, 12, 13));
String[] names = BiaoTi[BiaoTi.length-1];
// 数据填充
for (int i = 0; i < rows.size(); i++) {
Row dataRow = sheet.createRow(5 + i);
Map project = rows.get(i);
for (int j = 0; j 对应的jar包下载地址：poi所有需要的jar下载（3.8版本）