Java -> 把Excel表格中的数据写入数据库与从数据库中读出到本地 （未完善）

写入：没有关闭流，容错并不完善。

private void insertFile(HttpServletRequest request,
            HttpServletResponse response) throws IOException {

        String path_member = request.getParameter("path_member");
        List list = this.insert("f:/tmp001.xls", "gs_sale_members"); // url
                                                                        // table
        PrintWriter pw = response.getWriter();
        pw.print("{\"result\":" + list + "}"); // 返回插入失败的行数
        pw.close();
    }

/**
     *
     * @param path
     *            要解析的excel文件路径
     * @param dataTable
     *            要写入到数据库中的表名
     * @throws BiffException
     * @throws IOException
     */
    public List insert(String path, String dataTable) throws IOException,
            IOException {

        int a = 0;
        File file = new File(path);

        List list = new ArrayList();

        HSSFWorkbook rwb = null;
        // 创建输入流
        InputStream is = new FileInputStream(path);
        rwb = new HSSFWorkbook(is);

        // 得到工作簿
        HSSFSheet sheet = rwb.getSheetAt(0);

        int rsRows = sheet.getLastRowNum();// 获取总行数
        String simNumber = "";// 每个单元格中的数据

        DBConn jdbc = new DBConn();

        String str = "gs_salemen_seq,gs_salemen_name,gs_salemen_id,gs_salemen_papers_id,gs_salemen_jgid,gs_salemen_type,gs_salemen_status";// 拼接要插入的列
        HSSFRow row = sheet.getRow(0); // 获取第一行
        int rsColumns = row.getPhysicalNumberOfCells();// 列数
        // for (short j = 0; j < rsColumns; j++) {
        // HSSFCell cell = row.getCell(j);
        // simNumber = cell.getStringCellValue();
        // if (j == rsColumns - 1) {
        // // 最后一列不用加逗号
        // str += simNumber;
        // } else {
        // str += simNumber + ",";
        // }
        // }
        for (short i = 0; i < rsRows; i++) {
            HSSFRow row1 = sheet.getRow(i); // 获取行
            // 拼接sql
            String sql = "insert into " + dataTable + "(" + str + ") values(";

            for (short j = 0; j < rsColumns; j++) {

                HSSFCell cell = row1.getCell(j);
                if (cell != null) {
                    row1.getCell(j).setCellType(cell.CELL_TYPE_STRING);
                }
                System.out.println(cell);
                simNumber = cell.getStringCellValue();
                if (j == 0) {
                    sql += base.createId("gs_salemen_seq") + ",'" + simNumber
                            + "',";
                } else if (j == 5) {
                    sql += "'" + simNumber + "'";
                } else {
                    sql += "'" + simNumber + "',";
                }
            }
            sql += " )";
            a = jdbc.executeUpdate(sql);// 执行sql
            if (a == 0) {
                list.add(i);
            }
            // 查看拼的sql
            System.out.println("第" + (i + 1) + "行" + sql);
        }
        jdbc.closeStmt();
        jdbc.closeConnection();
        return list;
    }

package com.lj.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
 * Oracle数据库连接
 *
 */
public class DBConn {

    private Connection conn = null;
    private Statement stmt = null;
    private ResultSet rs = null;

    /** Oracle数据库连接 URL */
    private final static String DB_URL = "jdbc:oracle:thin:@192.168.1.7:1521:orcl";

    /** Oracle数据库连接驱动 */
    private final static String DB_DRIVER = "oracle.jdbc.driver.OracleDriver";

    /** 数据库用户名 */
    private final static String DB_USERNAME = "scott";

    /** 数据库密码 */
    private final static String DB_PASSWORD = "tiger";

    /**
     * 获取数据库连接
     *
     * @return
     */
    public Connection getConnection() {
        /** 声明Connection连接对象 */
        Connection conn = null;
        try {
            /** 使用 Class.forName()方法自动创建这个驱动程序的实例且自动调用DriverManager来注册它 */
            Class.forName(DB_DRIVER);
            /** 通过 DriverManager的getConnection()方法获取数据库连接 */
            conn = DriverManager
                    .getConnection(DB_URL, DB_USERNAME, DB_PASSWORD);
            stmt = conn.createStatement();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return conn;
    }

    /**
     * 查询数据部分
     *
     * @return ResultSet
     */
    public ResultSet executeQuery(String sqlStr) {
        if (sqlStr == null || sqlStr.length() == 0)
            return null;
        try {
            this.getConnection();
            rs = stmt.executeQuery(sqlStr);
            return rs;
        } catch (SQLException ex) {
            ex.printStackTrace();
            return null;
        }

    }

    /**
     * 更新数据部分
     *
     * @return 更新是否成功
     */
    public int executeUpdate(String sqlStr) {

        if (sqlStr == null || sqlStr.length() == 0)
            return 0;
        try {
            this.getConnection();
            stmt.executeUpdate(sqlStr);
            return 1;
        } catch (SQLException ex) {
            ex.printStackTrace();
            return 0;
        } finally {
            try {
                if (stmt != null) {
                    stmt.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
            try {
                if (conn != null) {
                    conn.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    public void closeStmt() {
        try {
            if (stmt != null) {
                stmt.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 关闭数据库连接
     *
     * @param connect
     */
    public void closeConnection() {
        try {
            if (conn != null) {
                /** 判断当前连接连接对象如果没有被关闭就调用关闭方法 */
                if (!conn.isClosed()) {
                    conn.close();
                }
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

}

读出：

private void outExcel(HttpServletRequest request,
            HttpServletResponse response) throws IOException {
        // 输出地址
        String loc = request.getParameter("loc");
        // 查询的表
        String table = request.getParameter("table");

        File file = new File(loc);
        if (!file.exists()) {

            file.createNewFile();
        }
        String sql = "select * from " + table;
        List<Map<String, Object>> list = base.querySql(sql);
        write2excel(list, file);
    }

public static void write2excel(List<Map<String, Object>> list, File file) {

        HSSFWorkbook excel = new HSSFWorkbook();

        HSSFSheet sheet = excel.createSheet("dept");

        HSSFRow firstRow = sheet.createRow(0);

        HSSFCell cells[] = new HSSFCell[3];

        String[] titles = new String[] { "deptno", "dname", "loc" };

        for (int i = 0; i < 3; i++) {

            cells[0] = firstRow.createCell(i);

            cells[0].setCellValue(titles[i]);

        }

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

            HSSFRow row = sheet.createRow(i + 1);

            // Computer computer = computers.get(i);

            HSSFCell cell = row.createCell(0);

            System.out.println(list.get(i).get("deptno"));

            cell.setCellValue(list.get(i).get("deptno").toString());

            cell = row.createCell(1);

            cell.setCellValue((String) list.get(i).get("dname"));

            cell = row.createCell(2);

            cell.setCellValue((String) list.get(i).get("loc"));

            cell = row.createCell(3);

        }

        OutputStream out = null;

        try {

            out = new FileOutputStream(file);

            excel.write(out);

            out.close();

        } catch (FileNotFoundException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }