eclipse与MYSQL数据库的链接问题
package test;import javax.swing.JFrame;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.JOptionPane;
import javax.swing.JTree;
import javax.swing.JScrollPane;
import javax.swing.JPanel;
import javax.swing.JSplitPane;
import java.awt.CardLayout;
import java.awt.Image;
import java.awt.Toolkit;
import javax.swing.ImageIcon;
import java.awt.Dimension;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
public class TeacherChint extends JFrame{
//主窗体的界面设计
private String host; //host=数据库主机IP+“：”+端口号
String coll_id; //声明学院编号的引用
//创建各个树的节点
private DefaultMutableTreeNode dmtnRoot=//创建根节点
new DefaultMutableTreeNode(new MyNode("操作选项","0"));
private DefaultMutableTreeNode dmtn1=//创建系统选项节点
new DefaultMutableTreeNode(new MyNode("系统选项","1"));
private DefaultMutableTreeNode dmtn2=//创建学生信息管理节点
new DefaultMutableTreeNode(new MyNode("学生信息管理","2"));
private DefaultMutableTreeNode dmtn3=//创建课程管理节点
new DefaultMutableTreeNode(new MyNode("课程管理","3"));
private DefaultMutableTreeNode dmtn4=//创建班级设置节点
new DefaultMutableTreeNode(new MyNode("班级设置","4"));
private DefaultMutableTreeNode dmtn11=//创建退出节点
new DefaultMutableTreeNode(new MyNode("退出","11"));
private DefaultMutableTreeNode dmtn13=//创建密码修改节点
new DefaultMutableTreeNode(new MyNode("密码修改","13"));
private DefaultMutableTreeNode dmtn21=//创建新生报到节点
new DefaultMutableTreeNode(new MyNode("新生报到","21"));
private DefaultMutableTreeNode dmtn22=//创建学生信息查询节点
new DefaultMutableTreeNode(new MyNode("学生信息查询","22"));
private DefaultMutableTreeNode dmtn221=//创建基本信息查询节点
new DefaultMutableTreeNode(new MyNode("基本信息查询","221"));
private DefaultMutableTreeNode dmtn222=//创建成绩查询节点
new DefaultMutableTreeNode(new MyNode("成绩查询","222"));
private DefaultMutableTreeNode dmtn31=//创建开课选项设置节点
new DefaultMutableTreeNode(new MyNode("开课选项设置","31"));
private DefaultMutableTreeNode dmtn32=//创建课程成绩录入节点
new DefaultMutableTreeNode(new MyNode("课程成绩录入","32"));
private DefaultMutableTreeNode dmtn34=//创建添加课程节点
new DefaultMutableTreeNode(new MyNode("添加课程","34"));
private DefaultMutableTreeNode dmtn42=//创建增加班级节点
new DefaultMutableTreeNode(new MyNode("增加班级","42"));
private DefaultTreeModel dtm=new DefaultTreeModel(dmtnRoot);//创建根节点
private JTree jt=new JTree(dtm);//创建树状列表控件
private JScrollPane jspz=new JScrollPane(jt);//创建滚动窗口
private JPanel jpy=new JPanel();//创建面板
private JSplitPane jspl=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,jspz,jpy);//创建分割窗格
//声明功能模块引用
private ChangePwdTeacher ch;
private NewStu newstu;
private TeacherSearchInfo ts;
private StuScore ss;
private Welcome wel;
private NewClass newclass;
CardLayout c1;//声明卡片布局引用
public TeacherChint(String coll_id,String host) {
this.host=host;
this.coll_id=coll_id;
this.initialTree();//初始化树状列表控件
this.initialPanel();//创建各功能模块对象
this.addListener();//为节点注册监听器
this.initialJpy();//初始化面板
this.initialFrame();//初始化主窗体
}
//主窗体的初始化方法
public void initialPanel() {//初始化各功能模块
ch = new ChangePwdTeacher(host);
newstu = new NewStu(coll_id, host);
ts = new TeacherSearchInfo(host);
ss = new StuScore(host);
wel = new Welcome("成绩管理系统");
newclass = new NewClass(coll_id,host);
}
public void initialTree() {//初始化树状列表控件的方法
dmtnRoot.add(dmtn1); dmtnRoot.add(dmtn2); dmtnRoot.add(dmtn3);//将各个节点添加到树根节点
dmtnRoot.add(dmtn4); dmtn1.add(dmtn11); dmtn1.add(dmtn13);
dmtn2.add(dmtn21); dmtn2.add(dmtn22); dmtn22.add(dmtn221);
dmtn22.add(dmtn222); dmtn3.add(dmtn31); dmtn3.add(dmtn32);
dmtn3.add(dmtn34); dmtn4.add(dmtn42);
}
public void initialJpy() {//将各功能模块添加到面板中
jpy.setLayout(new CardLayout());//将面板设置为卡片布局
c1 = (CardLayout)jpy.getLayout();//得到卡片布局引用
//各功能模块将在后面各模块的开发过程中注意添加
jpy.add(ch,"ch");
jpy.add(newstu,"newstu");
jpy.add(ts,"ts");
jpy.add(ss,"ss");
jpy.add(wel,"wel");
jpy.add(newclass,"newclass");
}
public void initialFrame() {//设置窗体的标题、大小及可见性
this.add(jspl); jspl.setDividerLocation(200);//设置分割窗体的位置并添加到主窗体
jspl.setDividerSize(4);//设置分隔条的大小
Image image = new ImageIcon().getImage();//加载窗体图标对象
this.setIconImage(image); this.setTitle("教师客户端");//设置窗体的图标和标题
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();//得到屏幕的Dimension对象
int centerX = screenSize.width/2;//计算屏幕宽度中间像素点
int centerY = screenSize.height/2;//计算屏幕高度中间项数点
int w = 900;//本窗体宽度
int h = 650;//本窗体高度
this.setBounds(centerX-w/2,centerY-h/2-30,w,h);//设置窗体出现在屏幕中央
this.setVisible(true);
this.setExtendedState(JFrame.MAXIMIZED_BOTH);//窗体全屏
}
//注册鼠标事件监听器
public void addListener() {//为树状列表控件注册鼠标事件监听器
jt.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
DefaultMutableTreeNode dmtntemp=//得到当前选中的节点对象
(DefaultMutableTreeNode)jt.getLastSelectedPathComponent();
MyNode mynode=(MyNode)dmtntemp.getUserObject();//得到自定义节点对象
String id= mynode.getId();//得到选中节点的名称
//根据id值选择显示不同的卡片
if(id.equals("0")) {/*欢迎界面*/
c1.show(jpy,"wel");
}
else if(id.equals("11")) {//退出系统
int i= JOptionPane.showConfirmDialog(jpy,"您确认要退出系统吗？",
"询问",JOptionPane.YES_NO_CANCEL_OPTION,JOptionPane.QUESTION_MESSAGE);
if(i==0){System.exit(0);} }//单击确认退出系统
else if(id.equals("13")) { /*更改密码页面*/
c1.show(jpy,"ch");
ch.setFocus();
}
else if(id.equals("21")) {/*添加学生页面*/
c1.show(jpy,"newstu");
newstu.setFocus();
}
else if(id.equals("221")) { /*学生信息查询页面*/
c1.show(jpy,"ts");
ts.setFocus();
}
else if(id.equals("222")) { /*成绩查询页面*/
c1.show(jpy,"ss");
ss.setFocus();
}
else if(id.equals("31")) { /*选课管理界面*/}
else if(id.equals("32")) { /*成绩录入界面*/}
else if(id.equals("34")) { /*添加课程页面*/}
else if(id.equals("42")) {/*添加班级页面*/
c1.show(jpy,"newclass");
newclass.setFocus();
}
}
});
jt.setToggleClickCount(1);//将展开节点的鼠标单击次数为1
}
class MyNode {
private String values;//声明values属性
private String id;
public MyNode(String values, String id) {
this.values = values;
this.id = id;
}
public String toString() { return this.values;}
public String getId() { return this.id;}
}
public static void main(String[] args) {
new TeacherChint("01","127.0.0.1:3306");
}
}
出现了一下错误，求指导！！！
java.lang.ArrayIndexOutOfBoundsException: 12
at test.NewStu.<clinit>(NewStu.java:55)
at test.TeacherChint.initialPanel(TeacherChint.java:85)
at test.TeacherChint.<init>(TeacherChint.java:75)
at test.TeacherChint.main(TeacherChint.java:187)
com.mysql.jdbc.exceptions. Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1121)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:357)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2482)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2519)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2304)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:834)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:416)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:346)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at test.NewStu.initialConnection(NewStu.java:89)
at test.NewStu.initialData(NewStu.java:110)
at test.NewStu.<init>(NewStu.java:80)
at test.TeacherChint.initialPanel(TeacherChint.java:85)
at test.TeacherChint.<init>(TeacherChint.java:75)
at test.TeacherChint.main(TeacherChint.java:187)
Caused by: Connection refused: connect
at (Native Method)
at (Unknown Source)
at (Unknown Source)
at (Unknown Source)
at (Unknown Source)
at (Unknown Source)
at (Unknown Source)
at (Unknown Source)
at (Unknown Source)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:259)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:307)
... 20 more
java.lang.NullPointerException
at test.NewStu.initialData(NewStu.java:113)
at test.NewStu.<init>(NewStu.java:80)
at test.TeacherChint.initialPanel(TeacherChint.java:85)
at test.TeacherChint.<init>(TeacherChint.java:75)
at test.TeacherChint.main(TeacherChint.java:187)
com.mysql.jdbc.exceptions. Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1121)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:357)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2482)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2519)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2304)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:834)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:416)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:346)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at test.NewClass.initialConnection(NewClass.java:76)
at test.NewClass.initialData(NewClass.java:37)
at test.NewClass.<init>(NewClass.java:30)
at test.TeacherChint.initialPanel(TeacherChint.java:89)
at test.TeacherChint.<init>(TeacherChint.java:75)
at test.TeacherChint.main(TeacherChint.java:187)
Caused by: Network is unreachable: connect
at (Native Method)
at (Unknown Source)
at (Unknown Source)
at (Unknown Source)
at (Unknown Source)
at (Unknown Source)
at (Unknown Source)
at (Unknown Source)
at (Unknown Source)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:259)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:307)
... 20 more
java.lang.NullPointerException
at test.NewClass.initialData(NewClass.java:39)
at test.NewClass.<init>(NewClass.java:30)
at test.TeacherChint.initialPanel(TeacherChint.java:89)
at test.TeacherChint.<init>(TeacherChint.java:75)
at test.TeacherChint.main(TeacherChint.java:187)
Exception in thread "main" java.lang.NullPointerException
at test.NewClass.initialFrame(NewClass.java:56)
at test.NewClass.<init>(NewClass.java:31)
at test.TeacherChint.initialPanel(TeacherChint.java:89)
at test.TeacherChint.<init>(TeacherChint.java:75)
at test.TeacherChint.main(TeacherChint.java:187)
程序代码：
源代码.zip