java怎么从数据库中查询数据并输出

刚刚漏了帐号密码了，现在补上

try {

//这里的是MYSQL 举例

//加载驱动 

ClassforName("commysqljdbcDriver");

//创建数据库连接

Connection con = DriverManagergetConnection("jdbc:mysql://localhost:3306/test","root","root");

//创建查询 “请求”

PreparedStatement ps = conprepareStatement("select  from user");

//返回查询结果

ResultSet rs = psexecuteQuery();

//遍历结果

while(rsnext()) {

//假如 User 表中 有个 name 列

Systemoutprintln("name >> "+rsgetString("name"));

}

//关闭

rsclose();

psclose();

conclose();

} catch (Exception e) {

eprintStackTrace();

}

java中的JTABLE是采用的MVC设计模式，有几个知识点要了解清楚

1 数据模型:你首先要把数据库中的数据存入数据模型

建立数据模型要实现一个AbstractTableModel接口。接口里有一个类似动态数组的vector变量，将数据库查询的结果存在这个动态的数组（vector）中

例 ：public class yourModel extends AbstractTableModel {}

2在JTABLE中调用模型: 在JTABLE组件有个一SETMODEL方法，模型建好后调用这个方法setmodel(model);

先说这么多,网上也有些例子一时没去找,有不明白的再留言

前段时间正好做了，导入和导出的，你自己看吧

 /导出数据为XLS格式

   @param fos

   @param bo

  /

 public void writeExcelBo(FileOutputStream fos, javautilVector ve)

 {

  jxlwriteWritableWorkbook wwb;

  try

  {

   wwb= WorkbookcreateWorkbook(fos);

   jxlwriteWritableSheet ws= wwbcreateSheet("booksheet", 10);

   wsaddCell(new jxlwriteLabel(0, 1, "书目ID"));

   wsaddCell(new jxlwriteLabel(1, 1, "ISBN"));

   wsaddCell(new jxlwriteLabel(2, 1, "定价"));

   wsaddCell(new jxlwriteLabel(3, 1, "书名"));

   wsaddCell(new jxlwriteLabel(4, 1, "原书名"));

   wsaddCell(new jxlwriteLabel(5, 1, "副题名"));

   wsaddCell(new jxlwriteLabel(6, 1, "著者"));

   wsaddCell(new jxlwriteLabel(7, 1, "译者"));

   wsaddCell(new jxlwriteLabel(8, 1, "版次"));

   wsaddCell(new jxlwriteLabel(9, 1, "出版地"));

   wsaddCell(new jxlwriteLabel(10, 1, "出版社"));

   wsaddCell(new jxlwriteLabel(11, 1, "出版日期"));

   wsaddCell(new jxlwriteLabel(12, 1, "页数"));

   wsaddCell(new jxlwriteLabel(13, 1, "书高"));

   wsaddCell(new jxlwriteLabel(14, 1, "装帧"));

   wsaddCell(new jxlwriteLabel(15, 1, "丛书名"));

   wsaddCell(new jxlwriteLabel(16, 1, "一般性附注项"));

   wsaddCell(new jxlwriteLabel(17, 1, "简介"));

   wsaddCell(new jxlwriteLabel(18, 1, "主题词"));

   wsaddCell(new jxlwriteLabel(19, 1, "中图法分类"));

   wsaddCell(new jxlwriteLabel(20, 1, "更新日期"));

   wsaddCell(new jxlwriteLabel(21, 1, "本数"));

   book=new Book[vesize()];

   for (int i= 0; i < vesize(); i++)

   {

    book[i]= (Book)veget(i);

    wsaddCell(new jxlwriteLabel(0, i + 2, "" + book[i]getBookId()));

    wsaddCell(new jxlwriteLabel(1, i + 2, book[i]getIsbn()));

    wsaddCell(new jxlwriteLabel(2, i + 2, "" + book[i]getPrice()));

    wsaddCell(new jxlwriteLabel(3, i + 2, book[i]getBookTitle()));

    wsaddCell(new jxlwriteLabel(4, i + 2, book[i]getOldFilename()));

    wsaddCell(new jxlwriteLabel(5, i + 2, book[i]getSubTitle()));

    wsaddCell(new jxlwriteLabel(6, i + 2, book[i]getWriter()));

    wsaddCell(new jxlwriteLabel(7, i + 2, book[i]getTranscribe()));

    wsaddCell(new jxlwriteLabel(8, i + 2, "" + book[i]getVersion()));

    wsaddCell(new jxlwriteLabel(9, i + 2, book[i]getPublishCity()));

    wsaddCell(new jxlwriteLabel(10, i + 2, book[i]getPublisher()));

    wsaddCell(new jxlwriteLabel(11, i + 2, book[i]getPublishDate()toString()));

    wsaddCell(new jxlwriteLabel(12, i + 2, "" + book[i]getPage()));

    wsaddCell(new jxlwriteLabel(13, i + 2, "" + book[i]getHight()));

    wsaddCell(new jxlwriteLabel(14, i + 2, book[i]getInstall()));

    wsaddCell(new jxlwriteLabel(15, i + 2, book[i]getSeries()));

    wsaddCell(new jxlwriteLabel(16, i + 2, book[i]getNotes()));

    wsaddCell(new jxlwriteLabel(17, i + 2, book[i]getPrecisnotes()));

    wsaddCell(new jxlwriteLabel(18, i + 2, book[i]getSubject()));

    wsaddCell(new jxlwriteLabel(19, i + 2, book[i]getCls()replaceAll("_", "")));

    wsaddCell(new jxlwriteLabel(20, i + 2, book[i]getUpdatedate()toString()));

    wsaddCell(new jxlwriteLabel(21, i + 2, "0"));

   }

   jxlwriteWritableFont wfc=

    new jxlwriteWritableFont(

     WritableFontARIAL,

     255,

     WritableFontBOLD,

     false,

     UnderlineStyleNO_UNDERLINE,

     jxlformatColourBLACK);

   jxlwriteWritableCellFormat wcfFC= new jxlwriteWritableCellFormat(wfc);

   wsaddCell(new jxlwriteLabel(0, 0, "为保证您提交定单的稳定和正确，导入定单时候请勿更改此表格式（请勿更改书目ID,订购本数自行添加！）"));

   wwbwrite();

   //关闭Excel工作薄对象

   wwbclose();

  } catch (IOException e)

  {} catch (RowsExceededException e)

  {} catch (WriteException e)

  {}

 }

   //导入EXCEL

   if (fgetName()indexOf("xls") > 0)

   {

    try

    {

     fis= new FileInputStream(f);

     BookBean bob= new BookBean();

     UserBean usb= new UserBean();

     jxlWorkbook rwb= WorkbookgetWorkbook(fis);

     jxlSheet sh= rwbgetSheet(0);

     int rowCount= shgetRows();

     SimpleDateFormat sdf= new SimpleDateFormat("dd/MM/yyyy");

     book= new Book[rowCount - 1];

     for (int i= 1; i < rowCount; i++)

     {

      book[i - 1]= new Book();

      jxlCell[] ce= shgetRow(i);

      book[i - 1]setIsbn(ce[0]getContents()toString());

      book[i - 1]setSeries(ce[1]getContents()toString());

      book[i - 1]setBookTitle(ce[2]getContents()toString());

      book[i - 1]setWriter(ce[3]getContents()toString());

      book[i - 1]setTranscribe(ce[4]getContents()toString());

      book[i - 1]setPublisher(ce[5]getContents()toString());

      book[i - 1]setPublishDate(sdfparse(ce[6]getContents()toString(), new ParsePosition(0)));

      book[i-1]setVersion(IntegerparseInt(ce[7]getContents()toString()));

      book[i-1]setPage(IntegerparseInt(ce[8]getContents()toString()));

      book[i-1]setCls(ce[9]getContents()toString());

      book[i-1]setPrecisnotes(ce[10]getContents()toString());

      book[i-1]setInstall(ce[11]getContents()toString());

      book[i-1]setPrice(FloatparseFloat(ce[12]getContents()toString()));

      book[i-1]setUserid(usbgetUser()getUserid());

      getVector()addElement(book[i - 1]);

     }

     rwbclose();

     fisclose();

    } catch (FileNotFoundException e)

    {} catch (BiffException e)

    {} catch (IOException e)

    {} catch (NumberFormatException e)

    {

     ShowMessage("数据导入失败，请按照本软件要求的EXCEL格式导入定单");

    }

   }

public void jButton1_actionPerformed(ActionEvent actionEvent) {

try {

Connection con=conDB();

Statement st = concreateStatement();

ResultSet rs=stexecuteQuery("select NAME,PRICE from test");

StringBuffer sb=null;

定义一个 StringBuffer sb;

sbappend(rsgetString("NAME")+" "+rsgetString("PRICE"))

while(rsnext() )

{

sbappend(rsgetString("NAME")+" "+rsgetString("PRICE"));

jTextAreaappend(sbtoString());

}

rsclose();

stclose();

conclose();

}

catch(Exception e){

JOptionPaneshowMessageDialog(null,"出现异常！");

}

}

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