5 将list中指定的字段填入excel模板


import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import com.zbiti.core.components.db.DBQuery;
import com.zbiti.core.components.db.DDProxy;
import com.zbiti.core.util.db.DBConnection;
import com.zbiti.core.vo.ParameterObject;
import ictpm.bzj_clean.component.WriteToModelExcel;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipOutputStream;
import java.io.*;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

public class IctJzIncomeCostExportTable {
    int startrow = 2;
    int startcol = 1;
    String cols = null;
    DBConnection dbc = null;
    DBQuery dbq = null;
    ParameterObject po = null;
    String exportPath;


    public IctJzIncomeCostExportTable(DBConnection dbc, ParameterObject po, String exportPath) {
        this.dbc = dbc;
        this.dbq = new DBQuery(dbc);
        this.po = po;
        this.exportPath = exportPath;
        this.cols = "YEAR_MONTH_ALL,JI_COMPANY_NAME,JI_PUB_CODE,JI_NAME,JI_IS_CL,JI_TYPE,JI_STATION_TYPE,JI_TOWER_PROPERTY," +
                "JI_PLAN_CODE,JI_TP_SITE_NUM,JI_SITE_NUM,JI_CODE_NUM,JI_LONGITUDE,JI_LAITUDE,JI_JZZJ," +
                "RRUNAME,NODE_TYPE,P_ID,ANLKL,NAFAZ";
    }

    public IctJzIncomeCostExportTable() {

    }

    @SuppressWarnings("unchecked")
    public int write(Map<String, String> params) {
        boolean is_success = true;
        List<Map<String, String>> list =new ArrayList<Map<String, String>>();
        try {
            DDProxy ddp = new DDProxy(dbc, "JZ_INCOME_COST_QUERY");
            ddp.getDBQuery().setNoneConditionError(false);
            this.dbc.setExBigData(false);
            list = dbq.query("JZ_INCOME_COST_QUERY.import", params);
            WriteToModelExcel wtme = new WriteToModelExcel();
            boolean flag = writeToExcel(exportPath, startrow, startcol, list, cols);
        } catch (SQLException e) {
            e.printStackTrace();

        }
        return list.size();
    }


    /**
     * 将list中指定的字段填入excel模板
     *
     * @param exportPath excel模板所在位置路径
     * @param startRow   数据填入起始行
     * @param startCol   数据填入起始列
     * @param list       所需填入的list
     * @param cols       指定的字段
     * @author liukang
     */
    public boolean writeToExcel(String exportPath, int startRow, int startCol, List<Map<String, String>> list, String cols) {
        FileInputStream fis = null;
        FileOutputStream fos = null;
        SXSSFWorkbook sxssfWorkbook = null;
        XSSFWorkbook wb=null;

        try {
            fis = new FileInputStream(exportPath);
            wb = new XSSFWorkbook(fis);
            sxssfWorkbook=new SXSSFWorkbook(wb,2000);
            Sheet sheet = sxssfWorkbook.getSheetAt(0);
            String[] list_cols = cols.split(",");
            for(int i = 0;i < list.size();i++){
                Row row = null;
                if(sheet.getRow(startRow+i-1) != null){
                    row = sheet.getRow(startRow+i-1);
                }else{
                    row = sheet.createRow(startRow+i-1);
                }
                for(int j = 0;j < list_cols.length;j++){
                   Cell cell = null;
                    if(row.getCell(j+startCol-1) != null){
                        cell = row.getCell(j+startCol-1);
                    }else{
                        cell = row.createCell(j+startCol-1);
                    }
                    cell.setCellValue(list.get(i).get(list_cols[j]));
                }
            }
            fos = new FileOutputStream(exportPath);
            sxssfWorkbook.write(fos);
           // wb.write(fos);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        } finally {
            try {
              if (null != sxssfWorkbook) {
                  sxssfWorkbook.dispose();
                }
                if (null != fis) {
                    fis.close();
                }
                if (null != fos) {
                    fos.flush();
                    fos.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }


    /**
     * 压缩文件(文件夹)
     *
     * @param path   目标文件流
     * @param format zip 格式 | rar 格式
     * @throws Exception
     */
    public String zipFile(File path, String format) throws Exception {
        String generatePath = "";
        if (path.isDirectory()) {
            generatePath = path.getParent().endsWith("/") == false ? path.getParent() + File.separator + path.getName() + "." + format : path.getParent() + path.getName() + "." + format;
        } else {
            generatePath = path.getParent().endsWith("/") == false ? path.getParent() + File.separator : path.getParent();
            generatePath += path.getName().substring(0, path.getName().lastIndexOf(".")) + "." + format;
        }
        // 输出流
        FileOutputStream outputStream = new FileOutputStream(generatePath);
        // 压缩输出流
        ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(outputStream));
        out.setEncoding("gbk");
        zip(out, path, "");
        out.flush();
        out.close();

        return generatePath;
    }


    /**
     * 递归压缩文件
     *
     * @param output    ZipOutputStream 对象流
     * @param file      压缩的目标文件流
     * @param childPath 条目目录
     */
    private void zip(ZipOutputStream output, File file, String childPath) {
        FileInputStream input = null;
        try {
            // 文件为目录
            if (file.isDirectory()) {
                // 得到当前目录里面的文件列表
                File list[] = file.listFiles();
                childPath = childPath + (childPath.length() == 0 ? "" : "/")
                        + file.getName();
                // 循环递归压缩每个文件
                for (File f : list) {
                    zip(output, f, childPath);
                }
            } else {
                // 压缩文件
                childPath = (childPath.length() == 0 ? "" : childPath + "/")
                        + file.getName();
                output.putNextEntry(new ZipEntry(childPath));
                output.setEncoding("gbk");
                input = new FileInputStream(file);
                int readLen = 0;
                byte[] buffer = new byte[1024 * 8];
                while ((readLen = input.read(buffer, 0, 1024 * 8)) != -1) {
                    output.write(buffer, 0, readLen);
                }
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        } finally {
            // 关闭流
            if (input != null) {
                try {
                    input.close();
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        }

    }

}


两种方法
1 用符号代替: > gt , >= gte ,< lt , <= lte
2 加括号 <#if(x>y)>

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