JAVA------18.excel导出

后台导出excel

1.导入jar包

链接：http://pan.baidu.com/s/1c2L70lE 密码：nvhh

2.获取绝对路径

2.源码：

package com.action;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.struts2.ServletActionContext;

import com.bean.AccountByDay;
import com.bean.Qcash;
import com.opensymphony.xwork2.ActionSupport;
import com.util.UrlUtil;

/**
 *  棋牌室提现excel导出
 * @author Administrator
 *
 */
public class QpsCashExcelAction extends ActionSupport{

    private List<Qcash> qcash;

    public List<Qcash> getQcash() {
        return qcash;
    }

    public void setQcash(List<Qcash> qcash) {
        this.qcash = qcash;
    }
    @Override
    public String execute() throws Exception {
        // TODO Auto-generated method stub
        HttpServletResponse response=null;
        response=ServletActionContext.getResponse();

        HttpServletRequest request=ServletActionContext.getRequest();

        response.setContentType("text/html;charset=UTF-8");
        response.setCharacterEncoding("UTF-8");
        PrintWriter out=response.getWriter();
        //创建session对象
        HttpSession session=ServletActionContext.getRequest().getSession();
        if (session.getAttribute("id")==null) {
            out.print("<script lanaguage=‘javascript‘>alert(‘请重新登录‘);window.location=‘login.jsp‘;></script>");
            out.flush();
            out.close();
            return null;
        }
        //棋牌室申请提现列表
        String url="dapail/qps/qpsApplyMoneyList.action?";
        JSONObject salerJson=JSONObject.fromObject(UrlUtil.getUrl(url));
        String data=salerJson.get("data").toString();
        JSONObject jsonData=JSONObject.fromObject(data);
        JSONArray backItemsjson = JSONArray.fromObject(jsonData.get("qpsMoneyItems").toString());
        List<Qcash> qc=new ArrayList<Qcash>();
        if(backItemsjson.size()>0){

            // 第一步，创建一个webbook，对应一个Excel文件
            HSSFWorkbook wb = new HSSFWorkbook();
            // 第二步，在webbook中添加一个sheet,对应Excel文件中的sheet
            HSSFSheet sheet = wb.createSheet("棋牌室申请提现");
            // 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制short
            HSSFRow row = sheet.createRow((int) 0);
            // 第四步，创建单元格，并设置值表头 设置表头居中
            HSSFCellStyle style = wb.createCellStyle();
            style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式  

            HSSFCell cell = row.createCell((short) 0);
            cell.setCellValue("提现id");
            cell.setCellStyle(style);
            cell = row.createCell((short) 1);
            cell.setCellValue("棋牌室名");
            cell.setCellStyle(style);
            cell = row.createCell((short) 2);
            cell.setCellValue("棋牌室账号");
            cell.setCellStyle(style);
            cell = row.createCell((short) 3);
            cell.setCellValue("卡名");
            cell.setCellStyle(style);
            cell = row.createCell((short) 4);
            cell.setCellValue("账户名");
            cell.setCellStyle(style);
            cell = row.createCell((short) 5);
            cell.setCellValue("银行卡账号");
            cell.setCellStyle(style);
            cell = row.createCell((short) 6);
            cell.setCellValue("提现金额");
            cell.setCellStyle(style);
            cell = row.createCell((short) 7);
            cell.setCellValue("提现状态");
            cell.setCellStyle(style);
            cell = row.createCell((short) 8);
            cell.setCellValue("提现时间");
            cell.setCellStyle(style);

         // 第五步，写入实体数据 实际应用中这些数据从数据库得到，

            for(int i=0;i<backItemsjson.size();i++){

                String cash_state="";
                JSONObject job = backItemsjson.getJSONObject(i);  // 遍历 jsonarray 数组，把每一个对象转成 json 对象
                if(job.get("cash_state").toString().equals("1"))
                {
                    cash_state="审核中";
                }else if(job.get("cash_state").toString().equals("2"))
                {
                    cash_state="审核成功";
                }
                else if(job.get("cash_state").toString().equals("3"))
                {
                    cash_state="审核失败";
                }

                row = sheet.createRow((int) i + 1);
                row.createCell((short) 0).setCellValue(job.get("cash_id").toString());//得到 每个对象中的属性值
                row.createCell((short) 1).setCellValue(job.get("qps_name").toString());//得到 每个对象中的属性值
                row.createCell((short) 2).setCellValue(job.get("qps_account").toString());//得到 每个对象中的属性值
                row.createCell((short) 3).setCellValue(job.get("card_name").toString());//得到 每个对象中的属性值
                row.createCell((short) 4).setCellValue(job.get("user_name").toString());//得到 每个对象中的属性值
                row.createCell((short) 5).setCellValue(job.get("card_num").toString());//得到 每个对象中的属性值
                row.createCell((short) 6).setCellValue(String.format("%.3f",Double.valueOf(job.get("cash_money").toString())));//得到 每个对象中的属性值
                row.createCell((short) 7).setCellValue(cash_state);//得到 每个对象中的属性值
                row.createCell((short) 8).setCellValue(job.get("cash_time").toString());//得到 每个对象中的属性值
                }
                // 第六步，将文件存到指定位置
                try
                {
                    //项目真实路径
                    String upload = request.getRealPath("/");
                    //
                    upload=upload.replace("webapps/Back/", "webapps/");

                    String path=upload+"qpsCash";

                    System.out.println(path);

                    File file = new File(path);
                        //判断上传文件的保存目录是否存在
                              if (!file.exists() && !file.isDirectory()) {
                                 //创建目录
                                 file.mkdir();
                            }

                    FileOutputStream fout = new FileOutputStream(path+"/qpsCash.xls");
                    wb.write(fout);
                    fout.close();
                }
                catch (Exception e)
                {
                    e.printStackTrace();
                }  

        }
        return SUCCESS;
    }
}