此次简单的操作将数据从数据库导出生成excel报表以及将excel数据导入数据库
首先建立数据库的连接池:
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package jdbc; import java.io.FileInputStream; import java.sql.Connection; import java.util.Properties; import org.apache.commons.dbcp.BasicDataSource; public class BaseDAO { private static BasicDataSource ds; static { try { //1.读取配置文件conf.properties,采用java.util.Properties来读取 Properties p= new Properties(); //2.通过文件流读取并解析配置文件内容,本地数据库用的mysql,所以把配置文件mysql的配置放开,其他数据库配置注释 p.load( new FileInputStream( "src/jdbc.properties" )); String driverName=p.getProperty( "jdbc.driverClassName" ); //获取驱动名称 String url=p.getProperty( "jdbc.url" ); //获取数据库的url String user=p.getProperty( "jdbc.username" ); //用户名 String password=p.getProperty( "jdbc.password" ); //密码 int maxActive=Integer.parseInt(p.getProperty( "jdbc.maxActive" )); //获取最大连接数 int maxWait=Integer.parseInt(p.getProperty( "jdbc.maxWait" )); //获取最大等待时间 //3.创建一个连接池 ds= new BasicDataSource(); ds.setDriverClassName(driverName); //设置驱动名称 ds.setUrl(url); //设置数据库地址 ds.setUsername(user); //设置用户名 ds.setPassword(password); //设置密码 ds.setMaxActive(maxActive); //设置最大连接数 ds.setMaxWait(maxWait); //设置最大等待时间 } catch (Exception e) { e.printStackTrace(); } } public static Connection getConnection() throws Exception { try { return ds.getConnection(); } catch (Exception e) { System.out.println( "连接数据库异常" ); throw e; } } public static void close(Connection conn){ if (conn!= null ){ try { conn.close(); } catch (Exception e) { e.printStackTrace(); } } } } |
生成与数据库相对应的java实体类:
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package entity; public class Test { private String a; private String b; private String c; private String d; private String e; private String f; private String g; private String h; private String i; private String j; public String getA() { return a; } public void setA(String a) { this .a = a; } public String getB() { return b; } public void setB(String b) { this .b = b; } public String getC() { return c; } public void setC(String c) { this .c = c; } public String getD() { return d; } public void setD(String d) { this .d = d; } public String getE() { return e; } public void setE(String e) { this .e = e; } public String getF() { return f; } public void setF(String f) { this .f = f; } public String getG() { return g; } public void setG(String g) { this .g = g; } public String getH() { return h; } public void setH(String h) { this .h = h; } public String getI() { return i; } public void setI(String i) { this .i = i; } public String getJ() { return j; } public void setJ(String j) { this .j = j; } } |
将excel表格数据插入数据库,先读取excel表格数据
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package readExcel; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.text.DecimalFormat; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List; import org.apache.poi.hssf.usermodel.HSSFCell; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.CellStyle; import org.apache.poi.ss.usermodel.Row; import org.apache.poi.ss.usermodel.Sheet; import org.apache.poi.ss.usermodel.Workbook; import org.apache.poi.xssf.usermodel.XSSFWorkbook; public class ReadExcel { /** * @param args * @throws IOException */ public List<List<String>> readExcel(File file) throws IOException{ List<List<String>> list= new ArrayList<List<String>>(); if (!file.exists()){ System.out.println( "文件不存在" ); } else { InputStream fis= new FileInputStream(file); list=parseExcel(file,fis); } return list; } public List<List<String>> parseExcel(File file,InputStream fis) throws IOException{ Workbook workbook= null ; List<List<String>> list= new ArrayList<List<String>>(); if (file.toString().endsWith( "xls" )){ workbook= new HSSFWorkbook(fis); } else if (file.toString().endsWith( "xlsx" )){ workbook= new XSSFWorkbook(fis); } else { System.out.println( "文件不是excel文档类型 ,此处无法读取" ); } for ( int i= 0 ;i<workbook.getNumberOfSheets();i++){ Sheet sheet=workbook.getSheetAt(i); if (sheet!= null ){ int lastRow=sheet.getLastRowNum(); //获取表格中的每一行 for ( int j= 0 ;j<=lastRow;j++){ Row row=sheet.getRow(j); short firstCellNum=row.getFirstCellNum(); short lastCellNum=row.getLastCellNum(); List<String> rowsList= new ArrayList<String>(); if (firstCellNum!=lastCellNum){ //获取每一行中的每一列 for ( int k=firstCellNum;k<lastCellNum;k++){ Cell cell=row.getCell(k); if (cell== null ){ rowsList.add( "" ); } else { rowsList.add(chanegType(cell)); } } } else { System.out.println( "该表格只有一列" ); } list.add(rowsList); } } } return list; } public String chanegType(Cell cell){ String result = new String(); switch (cell.getCellType()) { //获取单元格的类型 case HSSFCell.CELL_TYPE_NUMERIC: // 数字类型 if (cell.getCellType() == HSSFCell.CELL_TYPE_NUMERIC){ //如果是数值类型 short format = cell.getCellStyle().getDataFormat(); //获取这个单元的类型对应的数值 SimpleDateFormat sdf = null ; if (format == 14 || format == 31 || format == 57 || format == 58 ){ //如果数值为14,31,57,58其中的一种 //对应的日期格式为 2016-03-01这种形式, sdf = new SimpleDateFormat( "yyyy-MM-dd" ); double value = cell.getNumericCellValue(); Date date = org.apache.poi.ss.usermodel.DateUtil.getJavaDate(value); result = sdf.format(date); //得到yyyy-MM-dd这种格式日期 } else if (format == 20 || format == 32 ) { //时间 sdf = new SimpleDateFormat( "HH:mm" ); double value = cell.getNumericCellValue(); Date date = org.apache.poi.ss.usermodel.DateUtil.getJavaDate(value); result = sdf.format(date); //得到HH:mm } else { double value = cell.getNumericCellValue(); CellStyle style = cell.getCellStyle(); DecimalFormat dataformat = new DecimalFormat(); String temp = style.getDataFormatString(); // 单元格设置成常规 if (temp.equals( "General" )) { dataformat.applyPattern( "#" ); } result = dataformat.format(value); //得到单元格数值 } } break ; case HSSFCell.CELL_TYPE_STRING: // String类型 result = cell.getRichStringCellValue().toString(); break ; case HSSFCell.CELL_TYPE_BLANK: result = "" ; default : result = "" ; break ; } return result; } } |
将读取到的excel表格数据插入到数据库中去
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package importdata; import java.io.File; import java.sql.Connection; import java.sql.PreparedStatement; import java.util.ArrayList; import java.util.List; import entity.Test; import readExcel.ReadExcel; import jdbc.BaseDAO; public class inportData { public static void main(String[] args) throws Exception { // TODO Auto-generated method stub List<List<String>> list = new ArrayList<List<String>>(); ReadExcel readExcel= new ReadExcel(); File file= new File( "d:/test.xlsx" ); list=readExcel.readExcel(file); Test test= new Test(); Connection conn=BaseDAO.getConnection(); PreparedStatement ps= null ; int i= 1 ; for (List<String> rowlist:list){ if (rowlist!= null ){ test.setA(rowlist.get( 0 ).toString()); test.setB(rowlist.get( 1 ).toString()); test.setC(rowlist.get( 2 ).toString()); test.setD(rowlist.get( 3 ).toString()); test.setE(rowlist.get( 4 ).toString()); test.setF(rowlist.get( 5 ).toString()); test.setG(rowlist.get( 6 ).toString()); test.setH(rowlist.get( 7 ).toString()); test.setI(rowlist.get( 8 ).toString()); test.setJ(rowlist.get( 9 ).toString()); String sql= "insert into TEST(A,B,C,D,E,F,G,H,I,J) values(?,?,?,?,?,?,?,?,?,?)" ; ps=conn.prepareStatement(sql); ps.setString( 1 ,test.getA()); ps.setString( 2 ,test.getB()); ps.setString( 3 ,test.getC()); ps.setString( 4 ,test.getD()); ps.setString( 5 ,test.getE()); ps.setString( 6 ,test.getF()); ps.setString( 7 ,test.getG()); ps.setString( 8 ,test.getH()); ps.setString( 9 ,test.getI()); ps.setString( 10 ,test.getJ()); int n=ps.executeUpdate(); if (n!= 1 ){ System.out.println( "数据插入数据库失败" ); } System.out.println( "第" +i+ "条数据插入成功" ); System.out.println(); i++; } } } } |
将数据库中的数据查询出来并以excel表格的形式生成报表
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package export; import java.io.FileOutputStream; import java.io.IOException; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.util.ArrayList; import java.util.List; import org.apache.poi.hssf.usermodel.HSSFWorkbook; 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.ss.usermodel.Workbook; import org.apache.poi.xssf.usermodel.XSSFWorkbook; import entity.Test; import jdbc.BaseDAO; public class Export { public static void createExcel(List<Test> list){ FileOutputStream fos= null ; Workbook workbook= new XSSFWorkbook(); Sheet sheet=workbook.createSheet( "测试文件" ); String[] id="codetool">
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。 原文链接:http://www.cnblogs.com/feitianshaoxai/p/6400350.html 延伸 · 阅读
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