Java留言板要连接数据库,要实现增加，修改，删除，查询

可以链接的；

使用java链接时，需要下载相应数据库版的驱动程序

多写写调试一下，会对编程有好处。

祝您学习。

答案来自南京江宁蓝贵婚庆软件开发策划部。

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先说说回复吧：

假如:

留言表（id , text ）两个字段

回复表（ id , text parentId ）用来存放留言表id 三个字段

目前有一条留言

1001,'这是一条留言'

那么给这条留言的回复就是

1003 , '这是一条回复', 1001(这就是该留言的ID) 这样就把留言和回复关联上了

回复后点保存时，将数据传入后台，数据库做insert *** 作就行了

删除一样的

如果删除回复，直接传入回复的ID 即可

如果删除留言，得先判断该留言有没有回复，如果有回复，则先删除回复，在删除留言（外键约束）

您好。我重新地帮你写了代码，完全地符合了你的图片中的界面要求、功能要求。代码如下：（解决了问题，记得给我分哦~^_^呵呵……）

import java.awt.BorderLayout

import javax.swing.JPanel

import javax.swing.JFrame

import java.awt.Rectangle

import javax.swing.JLabel

import javax.swing.SwingConstants

import java.awt.Font

import javax.swing.JTextArea

import javax.swing.JScrollBar

import javax.swing.JScrollPane

import javax.swing.JComboBox

import javax.swing.JTextField

import javax.swing.JButton

public class Liuyb extends JFrame {

private static final long serialVersionUID = 1L

private JPanel jContentPane = null

private JLabel jLabel = null

private JTextArea jTextArea = null

private JScrollPane jScrollPane = null

private JLabel jLabel1 = null

private JComboBox jComboBox = null

private JLabel jLabel2 = null

private JTextField jTextField = null

private JButton jButton = null

private JButton jButton1 = null

private JButton jButton2 = null

private JButton jButton3 = null

/**

* This is the default constructor

*/

public Liuyb() {

super()

initialize()

}

/**

* This method initializes this

*

* @return void

*/

private void initialize() {

this.setContentPane(getJContentPane())

this.setTitle("留言板程序")

this.setBounds(new Rectangle(0, 0, 640, 480))

this.setVisible(true)

}

/**

* This method initializes jContentPane

*

* @return javax.swing.JPanel

*/

private JPanel getJContentPane() {

if (jContentPane == null) {

jLabel2 = new JLabel()

jLabel2.setBounds(new Rectangle(214, 407, 45, 24))

jLabel2.setFont(new Font("Dialog", Font.BOLD, 14))

jLabel2.setText("地说：")

jLabel1 = new JLabel()

jLabel1.setBounds(new Rectangle(32, 407, 15, 24))

jLabel1.setFont(new Font("Dialog", Font.BOLD, 14))

jLabel1.setText("你")

jLabel = new JLabel()

jLabel.setBounds(new Rectangle(283, 15, 45, 20))

jLabel.setHorizontalAlignment(SwingConstants.CENTER)

jLabel.setFont(new Font("Dialog", Font.BOLD, 14))

jLabel.setText("留言板")

jContentPane = new JPanel()

jContentPane.setLayout(null)

jContentPane.add(jLabel, null)

jContentPane.add(getJScrollPane(), null)

jContentPane.add(jLabel1, null)

jContentPane.add(getJComboBox(), null)

jContentPane.add(jLabel2, null)

jContentPane.add(getJTextField(), null)

jContentPane.add(getJButton(), null)

jContentPane.add(getJButton1(), null)

jContentPane.add(getJButton2(), null)

jContentPane.add(getJButton3(), null)

}

return jContentPane

}

/**

* This method initializes jTextArea

*

* @return javax.swing.JTextArea

*/

private JTextArea getJTextArea() {

if (jTextArea == null) {

jTextArea = new JTextArea()

jTextArea.setText("留言内容：")

jTextArea.setEditable(false)

}

return jTextArea

}

/**

* This method initializes jScrollPane

*

* @return javax.swing.JScrollPane

*/

private JScrollPane getJScrollPane() {

if (jScrollPane == null) {

jScrollPane = new JScrollPane()

jScrollPane.setBounds(new Rectangle(22, 49, 534, 347))

jScrollPane.setViewportView(getJTextArea())

}

return jScrollPane

}

/**

* This method initializes jComboBox

*

* @return javax.swing.JComboBox

*/

private JComboBox getJComboBox() {

if (jComboBox == null) {

jComboBox = new JComboBox()

jComboBox.setBounds(new Rectangle(54, 407, 149, 24))

String[] mycbox={"微笑","大笑","痛苦"}

jComboBox.addItem(mycbox[0])

jComboBox.addItem(mycbox[1])

jComboBox.addItem(mycbox[2])

}

return jComboBox

}

/**

* This method initializes jTextField

*

* @return javax.swing.JTextField

*/

private JTextField getJTextField() {

if (jTextField == null) {

jTextField = new JTextField()

jTextField.setBounds(new Rectangle(265, 407, 231, 24))

}

return jTextField

}

/**

* This method initializes jButton

*

* @return javax.swing.JButton

*/

private JButton getJButton() {

if (jButton == null) {

jButton = new JButton()

jButton.setBounds(new Rectangle(505, 407, 70, 24))

jButton.setText("提交")

jButton.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

jTextArea.setText(jTextArea.getText()+"\r\n"+"你"+jComboBox.getSelectedItem().toString()+"地说："+jTextField.getText())

}

})

}

return jButton

}

/**

* This method initializes jButton1

*

* @return javax.swing.JButton

*/

private JButton getJButton1() {

if (jButton1 == null) {

jButton1 = new JButton()

jButton1.setBounds(new Rectangle(565, 51, 60, 32))

jButton1.setText("清屏")

jButton1.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

jTextArea.setText("留言内容：")

}

})

}

return jButton1

}

/**

* This method initializes jButton2

*

* @return javax.swing.JButton

*/

private JButton getJButton2() {

if (jButton2 == null) {

jButton2 = new JButton()

jButton2.setBounds(new Rectangle(565, 112, 60, 32))

jButton2.setText("置顶")

jButton2.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

jTextArea.setCaretPosition(0)

}

})

}

return jButton2

}

/**

* This method initializes jButton3

*

* @return javax.swing.JButton

*/

private JButton getJButton3() {

if (jButton3 == null) {

jButton3 = new JButton()

jButton3.setBounds(new Rectangle(565, 173, 60, 32))

jButton3.setText("至尾")

jButton3.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

jTextArea.setCaretPosition((int)jTextArea.getText().length())

}

})

}

return jButton3

}

public static void main(String args[]){

new Liuyb()

}

}

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