Java2实用教程（第二版）程序代码——第二十三章 Java数据库连接(JDBC)
1
//例子1
2import java.sql.*;
3public class Example23_1
4
{ public static void main(String args[])
5
{ Connection con;Statement sql; ResultSet rs;
6 try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
7
}
8
catch(ClassNotFoundException e)
9 { System.out.println(""+e);
10 }
11 try
12 {
13 con=DriverManager.getConnection("jdbc:odbc:redsun","snow","ookk");
14 sql=con.createStatement();
15 rs=sql.executeQuery("SELECT * FROM chengjibiao");
16 while(rs.next())
17 { String number=rs.getString(1);
18 String name=rs.getString(2);
19 Date date=rs.getDate(3);
20 int math=rs.getInt("数学");
21 int physics=rs.getInt("物理");
22 int english=rs.getInt("英语");
23 System.out.println("学号："+number);
24 System.out.print(" 姓名："+name);
25 System.out.print(" 出生："+date);
26 System.out.print(" 数学："+math);
27 System.out.print(" 物理："+physics);
28 System.out.print(" 英语："+english);
29 }
30 con.close();
31 }
32 catch(SQLException e1) {}
33
34 }
35
}
36
37//例子2
38import java.sql.*;
39public class Example23_2
40{ public static void main(String args[])
41 { Connection con;Statement sql; ResultSet rs;
42 try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
43 }
44 catch(ClassNotFoundException e)
45 { System.out.println(""+e);
46 }
47 try
48 { con=DriverManager.getConnection("jdbc:odbc:redsun","snow","ookk");
49 sql=con.createStatement();
50 rs=sql.executeQuery("SELECT 姓名,英语 FROM chengjibiao WHERE 英语 >= 80 ");
51 while(rs.next())
52 { String name=rs.getString(1);
53 int english=rs.getInt(2);
54 System.out.println(" 姓名："+name);
55 System.out.print(" 英语："+english);
56 }
57 con.close();
58 }
59 catch(SQLException e1) {}
60 }
61}
62
63//例子3
64import java.awt.*;import java.net.*;
65import java.sql.*;import java.awt.event.*;
66class DataWindow extends Frame implements ActionListener
67{ TextField englishtext;TextArea chinesetext; Button button;
68 DataWindow()
69 { super("英汉小词典");
70 setBounds(150,150,300,120);
71 setVisible(true);
72 englishtext=new TextField(16);
73 chinesetext=new TextArea(5,10);
74 button=new Button("确定");
75 Panel p1=new Panel(),p2=new Panel();
76 p1.add(new Label("输入要查询的英语单词:"));
77 p1.add(englishtext);
78 p2.add(button);
79 add(p1,"North");add(p2,"South");add(chinesetext,"Center");
80 button.addActionListener(this);
81 addWindowListener(new WindowAdapter()
82 { public void windowClosing(WindowEvent e)
83 { System.exit(0);
84 }
85 });
86 }
87 public void actionPerformed(ActionEvent e)
88 { if(e.getSource()==button)
89 { chinesetext.setText("查询结果");
90 try{ Liststudent();
91 }
92 catch(SQLException ee) {}
93 }
94 }
95 public void Liststudent() throws SQLException
96 { String cname,ename;
97 try{ Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
98 }
99 catch(ClassNotFoundException e){}
100 Connection Ex1Con=DriverManager.getConnection("jdbc:odbc:test","gxy","ookk");
101 Statement Ex1Stmt=Ex1Con.createStatement();
102 ResultSet rs=Ex1Stmt.executeQuery("SELECT * FROM 表1 ");
103 boolean boo=false;
104 while((boo=rs.next())==true)
105 { ename=rs.getString("单词");
106 cname=rs.getString("解释");
107 if(ename.equals(englishtext.getText()))
108 {
109 chinesetext.append('\n'+cname);
110 break;
111 }
112 }
113 Ex1Con.close();
114 if(boo==false)
115 { chinesetext.append('\n'+"没有该单词");
116 }
117 }
118}
119public class Example23_3
120{ public static void main(String args[])
121 { DataWindow window=new DataWindow();window.pack();
122 }
123}
124
125//例子4
126import java.sql.*;
127public class Example23_4
128{ public static void main(String args[])
129 { Connection con;Statement sql; ResultSet rs;
130 try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
131 }
132 catch(ClassNotFoundException e)
133 { System.out.println(""+e);
134 }
135 try
136 { con=DriverManager.getConnection("jdbc:odbc:redsun","snow","ookk");
137 sql=con.createStatement();
138 sql=
139 con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);
140 //返回可滚动的结果集：
141 rs=sql.executeQuery("SELECT 姓名,英语 FROM chengjibiao WHERE 英语 >= 80 ");
142 //将游标移动到最后一行：
143 rs.last();
144 //获取最后一行的行号：
145 int number=rs.getRow();
146 System.out.println("该表共有"+number+"条记录");
147 //为了逆序输出记录，需将游标移动到最后一行之后：
148 rs.afterLast();
149 while(rs.previous())
150 { String name=rs.getString(1);
151 int english=rs.getInt("英语");
152 System.out.println(" 姓名："+name);
153 System.out.print(" 英语："+english);
154 }
155 System.out.println("单独输出第5条记录:");
156 rs.absolute(5);
157 String name=rs.getString(1);
158 int english=rs.getInt("英语");
159 System.out.println(" 姓名："+name);
160 System.out.print(" 英语："+english);
161 con.close();
162 }
163 catch(SQLException e1) {}
164 }
165}
166
167//例子5
168import java.sql.*;
169public class Example23_5
170{ public static void main(String args[])
171 { Connection con;Statement sql; ResultSet rs;
172 try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
173 }
174 catch(ClassNotFoundException e)
175 { System.out.println(""+e);
176 }
177 try
178 { con=DriverManager.getConnection("jdbc:odbc:redsun","snow","ookk");
179 sql=con.createStatement();
180 String condition="SELECT 姓名,英语 FROM chengjibiao ORDER BY 英语";
181 rs=sql.executeQuery(condition);
182 while(rs.next())
183 { String name=rs.getString(1);
184 int english=rs.getInt(2);
185 System.out.println(" 姓名："+name);
186 System.out.print(" 英语："+english);
187 }
188 con.close();
189 }
190 catch(SQLException e1) { System.out.print(e1);}
191 }
192}
193
194//例子6
195import java.sql.*;
196public class Example23_6
197{ public static void main(String args[])
198 { Connection con;Statement sql; ResultSet rs;
199 try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
200 }
201 catch(ClassNotFoundException e)
202 { System.out.println(""+e);
203 }
204 try
205 { con=DriverManager.getConnection("jdbc:odbc:redsun","snow","ookk");
206 sql=con.createStatement();
207 rs=sql.executeQuery("SELECT 姓名,数学 FROM chengjibiao WHERE 姓名 LIKE '%小%' ");
208 while(rs.next())
209 { String name=rs.getString(1);
210 int math=rs.getInt(2);
211 System.out.println(" 姓名："+name);
212 System.out.print(" 数学："+math);
213 }
214 con.close();
215 }
216 catch(SQLException e1) { System.out.print(e1);}
217 }
218}
219
220//例子7
221import java.awt.*;
222import java.sql.*;import java.awt.event.*;
223class DataWindow extends Frame implements ActionListener
224 { TextField 待查英文单词_文本条,汉语解释_文本条,
225 更新英文单词_文本条,更新汉语解释_文本条,
226 填加英文单词_文本条,填加汉语解释_文本条;
227 Button 查询按扭,更新按扭,填加按扭;
228 int 查询记录=0;
229 Connection Con=null;Statement Stmt=null;
230 DataWindow()
231 { super("英汉小词典");
232 setBounds(150,150,300,120);
233 setVisible(true);setLayout(new GridLayout(3,1));
234 try{Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");}
235 catch(ClassNotFoundException e){}
236 try{
237Con=DriverManager.getConnection("jdbc:odbc:test","gxy","ookk");
238 Stmt=Con.createStatement();
239 }
240 catch(SQLException ee) {}
241 待查英文单词_文本条=new TextField(16);
242汉语解释_文本条=new TextField(16);
243 更新英文单词_文本条=new TextField(16);
244更新汉语解释_文本条=new TextField(16);
245 填加英文单词_文本条=new TextField(16);
246填加汉语解释_文本条=new TextField(16);
247 查询按扭=new Button("查询");
248 更新按扭=new Button("更新");
249 填加按扭=new Button("填加");
250 Panel p1=new Panel(),p2=new Panel(),p3=new Panel();
251 p1.add(new Label("输入要查询的英语单词:"));
252p1.add( 待查英文单词_文本条);
253 p1.add(new Label("显示英语单词的汉语解释:"));
254p1.add(汉语解释_文本条);
255 p1.add(查询按扭);
256 p2.add(new Label("输入英语单词:"));p2.add( 更新英文单词_文本条);
257 p2.add(new Label("输入该单词更新的汉语解释:"));
258p2.add(更新汉语解释_文本条);
259 p2.add(更新按扭);
260 p3.add(new Label("输入英语单词:"));p3.add( 填加英文单词_文本条);
261 p3.add(new Label("输入汉语解释:"));p3.add(填加汉语解释_文本条);
262 p3.add(填加按扭);
263 add(p1);add(p2);add(p3);
264 查询按扭.addActionListener(this);更新按扭.addActionListener(this);
265 填加按扭.addActionListener(this);
266 addWindowListener(new WindowAdapter()
267 {public void windowClosing(WindowEvent e)
268 {setVisible(false);System.exit(0); } } );
269 }
270 public void actionPerformed(ActionEvent e)
271 {if(e.getSource()==查询按扭)
272 { 查询记录=0;
273 try{ 查询();}
274 catch(SQLException ee) {}
275 }
276 else if(e.getSource()==更新按扭)
277 { try{ 更新();}
278 catch(SQLException ee) {}
279 }
280 else if(e.getSource()==填加按扭)
281 { try{ 填加();}
282 catch(SQLException ee) {}
283 }
284 }
285 public void 查询() throws SQLException
286 { String cname,ename;
287 Con=DriverManager.getConnection("jdbc:odbc:test","gxy","ookk");
288 ResultSet rs=Stmt.executeQuery("SELECT * FROM 表1 ");
289 while (rs.next())
290 { ename=rs.getString("单词"); cname=rs.getString("解释");
291 if(ename.equals( 待查英文单词_文本条.getText().trim()))
292 { 汉语解释_文本条.setText(cname);查询记录=1; break;
293 }
294 }
295 Con.close();
296 if(查询记录==0)
297 { 汉语解释_文本条.setText("没有该单词");
298 }
299 }
300 public void 更新() throws SQLException
301 { String s1="'"+更新英文单词_文本条.getText().trim()+"'",
302 s2="'"+更新汉语解释_文本条.getText().trim()+"'";
303 String temp="UPDATE 表1 SET 解释 ="+s2+" WHERE 单词 = "+s1 ;
304 Con=DriverManager.getConnection("jdbc:odbc:test","gxy","ookk");
305 Stmt.executeUpdate(temp); Con.close();
306 }
307 public void 填加() throws SQLException
308 { String s1="'"+填加英文单词_文本条.getText().trim()+"'",
309 s2="'"+填加汉语解释_文本条.getText().trim()+"'";
310 String temp="INSERT INTO 表1 VALUES ("+s1+","+s2+")";
311 Con=DriverManager.getConnection("jdbc:odbc:test","gxy","ookk");
312 Stmt.executeUpdate(temp);
313 Con.close();
314 }
315}
316public class Database
317{ public static void main(String args[])
318 {DataWindow window=new DataWindow();window.pack();
319 }
320}
321
322//例子8
323(1) 客户端程序（效果如图23.11）
324import java.net.*;import java.io.*;
325import java.awt.*;import java.awt.event.*;
326import java.applet.*;
327public class Database_client extends Applet implements Runnable,ActionListener
328{ Button 查询;TextField 英文单词_文本框,汉语解释_文本框;
329 Socket socket=null;
330 DataInputStream in=null;
331 DataOutputStream out=null;
332 Thread thread;
333 public void init()
334 {查询=new Button("查询");
335 英文单词_文本框=new TextField(10);汉语解释_文本框=new TextField(10);
336 add(new Label("输入要查询的英文单词"));add(英文单词_文本框);
337 add(new Label("汉语解释："));add(汉语解释_文本框);add(查询);
338 查询.addActionListener(this);
339 }
340 public void start()
341 { try
342 {socket = new Socket(this.getCodeBase().getHost(), 4331);
343 in = new DataInputStream(socket.getInputStream());
344 out = new DataOutputStream(socket.getOutputStream());
345 }
346 catch (IOException e){}
347 if (thread == null)
348 {thread = new Thread(this);
349 thread.setPriority(Thread.MIN_PRIORITY);
350 thread.start();
351 }
352 }
353 public void stop()
354 {try{out.writeUTF("客户离开");}
355 catch(IOException e1){}
356 }
357 public void destroy()
358 {try{out.writeUTF("客户离开");}
359 catch(IOException e1){}
360 }
361 public void run()
362 {String s=null;
363 while(true)
364 { try{s=in.readUTF();
365 }
366 catch (IOException e)
367 {汉语解释_文本框.setText("与服务器已断开");break;
368}
369 汉语解释_文本框.setText(s);
370 }
371 }
372 public void actionPerformed(ActionEvent e)
373 {if (e.getSource()==查询)
374 { String s=英文单词_文本框.getText();
375 if(s!=null)
376 { try{out.writeUTF(s);}
377 catch(IOException e1){}
378 }
379
380 }
381 }
382}
383(2) 服务器端程序：
384import java.io.*;import java.net.*;
385import java.util.*;import java.sql.*;
386public class Database_server
387{ public static void main(String args[])
388 { ServerSocket server=null;Server_thread thread;
389 Socket you=null;
390 while(true)
391 { try{ server=new ServerSocket(4331);
392 }
393 catch(IOException e1) {System.out.println("正在监听");}
394 try{ you=server.accept();
395 }
396 catch (IOException e)
397 {System.out.println("正在等待客户");
398 }
399 if(you!=null)
400 {new Server_thread(you).start();
401 }
402 else {continue;}
403 }
404 }
405}
406class Server_thread extends Thread
407{ Socket socket;Connection Con=null;Statement Stmt=null;
408 DataOutputStream out=null;DataInputStream in=null;
409 String s=null;
410 Server_thread(Socket t)
411 { socket=t;
412 try {in=new DataInputStream(socket.getInputStream());
413 out=new DataOutputStream(socket.getOutputStream());
414 }
415 catch (IOException e) {}
416 try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
417 }
418 catch(ClassNotFoundException e)
419 {
420 }
421 try { Con=DriverManager.getConnection("jdbc:odbc:test","gxy","ookk");
422 Stmt=Con.createStatement();
423 }
424 catch(SQLException ee) {}
425 }
426 public void run()
427 { while(true)
428 {try{ s=in.readUTF();
429 int n=0;
430 ResultSet rs=
431 Stmt.executeQuery("SELECT * FROM 表1 WHERE 单词 ="+"'"+s+"'" );
432 while (rs.next())
433 { String 英语单词=rs.getString("单词");
434 if(s.equals(英语单词))
435 { out.writeUTF(rs.getString("解释")); n=1;break;
436 }
437 if(n==0) {out.writeUTF("没有此单词");}
438 }
439 sleep(45);
440 }
441 catch(Exception ee)
442 { break;
443 }
444
445 }
446 }
447}
448
//例子12
import java.sql.*;3
public class Example23_14
{ public static void main(String args[])
5
{ Connection con;Statement sql; ResultSet rs;
6
try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); 7
}8
catch(ClassNotFoundException e)9
{ System.out.println(""+e);10
}11
try12
{ 13
con=DriverManager.getConnection("jdbc:odbc:redsun","snow","ookk");14
sql=con.createStatement();15
rs=sql.executeQuery("SELECT * FROM chengjibiao");16
while(rs.next())17
{ String number=rs.getString(1);18
String name=rs.getString(2); 19
Date date=rs.getDate(3);20
int math=rs.getInt("数学");21
int physics=rs.getInt("物理"); 22
int english=rs.getInt("英语");23
System.out.println("学号："+number); 24
System.out.print(" 姓名："+name);25
System.out.print(" 出生："+date);26
System.out.print(" 数学："+math);27
System.out.print(" 物理："+physics); 28
System.out.print(" 英语："+english);29
}30
con.close();31
}32
catch(SQLException e1) {}33
34
} 35
} 36
37
//例子238
import java.sql.*;39
public class Example23_240
{ public static void main(String args[])41
{ Connection con;Statement sql; ResultSet rs;42
try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); 43
}44
catch(ClassNotFoundException e)45
{ System.out.println(""+e);46
}47
try48
{ con=DriverManager.getConnection("jdbc:odbc:redsun","snow","ookk");49
sql=con.createStatement();50
rs=sql.executeQuery("SELECT 姓名,英语 FROM chengjibiao WHERE 英语 >= 80 ");51
while(rs.next())52
{ String name=rs.getString(1); 53
int english=rs.getInt(2);54
System.out.println(" 姓名："+name);55
System.out.print(" 英语："+english);56
}57
con.close();58
}59
catch(SQLException e1) {}60
} 61
} 62
63
//例子364
import java.awt.*;import java.net.*;65
import java.sql.*;import java.awt.event.*;66
class DataWindow extends Frame implements ActionListener67
{ TextField englishtext;TextArea chinesetext; Button button;68
DataWindow()69
{ super("英汉小词典");70
setBounds(150,150,300,120); 71
setVisible(true);72
englishtext=new TextField(16);73
chinesetext=new TextArea(5,10);74
button=new Button("确定");75
Panel p1=new Panel(),p2=new Panel();76
p1.add(new Label("输入要查询的英语单词:"));77
p1.add(englishtext);78
p2.add(button);79
add(p1,"North");add(p2,"South");add(chinesetext,"Center");80
button.addActionListener(this);81
addWindowListener(new WindowAdapter()82
{ public void windowClosing(WindowEvent e)83
{ System.exit(0); 84
} 85
});86
}87
public void actionPerformed(ActionEvent e)88
{ if(e.getSource()==button)89
{ chinesetext.setText("查询结果");90
try{ Liststudent();91
}92
catch(SQLException ee) {}93
}94
}95
public void Liststudent() throws SQLException96
{ String cname,ename;97
try{ Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");98
}99
catch(ClassNotFoundException e){}100
Connection Ex1Con=DriverManager.getConnection("jdbc:odbc:test","gxy","ookk");101
Statement Ex1Stmt=Ex1Con.createStatement();102
ResultSet rs=Ex1Stmt.executeQuery("SELECT * FROM 表1 "); 103
boolean boo=false;104
while((boo=rs.next())==true)105
{ ename=rs.getString("单词"); 106
cname=rs.getString("解释");107
if(ename.equals(englishtext.getText()))108
{109
chinesetext.append('\n'+cname);110
break;111
} 112
}113
Ex1Con.close();114
if(boo==false)115
{ chinesetext.append('\n'+"没有该单词"); 116
}117
}118
}119
public class Example23_3120
{ public static void main(String args[])121
{ DataWindow window=new DataWindow();window.pack();122
}123
}124
125
//例子4126
import java.sql.*;127
public class Example23_4128
{ public static void main(String args[])129
{ Connection con;Statement sql; ResultSet rs;130
try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); 131
}132
catch(ClassNotFoundException e)133
{ System.out.println(""+e);134
}135
try136
{ con=DriverManager.getConnection("jdbc:odbc:redsun","snow","ookk");137
sql=con.createStatement();138
sql=139
con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);140
//返回可滚动的结果集：141
rs=sql.executeQuery("SELECT 姓名,英语 FROM chengjibiao WHERE 英语 >= 80 ");142
//将游标移动到最后一行：143
rs.last();144
//获取最后一行的行号：145
int number=rs.getRow();146
System.out.println("该表共有"+number+"条记录");147
//为了逆序输出记录，需将游标移动到最后一行之后：148
rs.afterLast();149
while(rs.previous())150
{ String name=rs.getString(1); 151
int english=rs.getInt("英语");152
System.out.println(" 姓名："+name);153
System.out.print(" 英语："+english);154
}155
System.out.println("单独输出第5条记录:");156
rs.absolute(5);157
String name=rs.getString(1); 158
int english=rs.getInt("英语");159
System.out.println(" 姓名："+name);160
System.out.print(" 英语："+english);161
con.close();162
}163
catch(SQLException e1) {}164
} 165
} 166
167
//例子5168
import java.sql.*;169
public class Example23_5170
{ public static void main(String args[])171
{ Connection con;Statement sql; ResultSet rs;172
try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); 173
}174
catch(ClassNotFoundException e)175
{ System.out.println(""+e);176
}177
try178
{ con=DriverManager.getConnection("jdbc:odbc:redsun","snow","ookk");179
sql=con.createStatement();180
String condition="SELECT 姓名,英语 FROM chengjibiao ORDER BY 英语";181
rs=sql.executeQuery(condition);182
while(rs.next())183
{ String name=rs.getString(1); 184
int english=rs.getInt(2);185
System.out.println(" 姓名："+name);186
System.out.print(" 英语："+english);187
}188
con.close();189
}190
catch(SQLException e1) { System.out.print(e1);}191
} 192
} 193
194
//例子6195
import java.sql.*;196
public class Example23_6197
{ public static void main(String args[])198
{ Connection con;Statement sql; ResultSet rs;199
try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); 200
}201
catch(ClassNotFoundException e)202
{ System.out.println(""+e);203
}204
try205
{ con=DriverManager.getConnection("jdbc:odbc:redsun","snow","ookk");206
sql=con.createStatement();207
rs=sql.executeQuery("SELECT 姓名,数学 FROM chengjibiao WHERE 姓名 LIKE '%小%' ");208
while(rs.next())209
{ String name=rs.getString(1); 210
int math=rs.getInt(2);211
System.out.println(" 姓名："+name);212
System.out.print(" 数学："+math);213
}214
con.close();215
}216
catch(SQLException e1) { System.out.print(e1);}217
} 218
} 219
220
//例子7221
import java.awt.*;222
import java.sql.*;import java.awt.event.*;223
class DataWindow extends Frame implements ActionListener224
{ TextField 待查英文单词_文本条,汉语解释_文本条,225
更新英文单词_文本条,更新汉语解释_文本条,226
填加英文单词_文本条,填加汉语解释_文本条; 227
Button 查询按扭,更新按扭,填加按扭;228
int 查询记录=0;229
Connection Con=null;Statement Stmt=null;230
DataWindow()231
{ super("英汉小词典");232
setBounds(150,150,300,120); 233
setVisible(true);setLayout(new GridLayout(3,1));234
try{Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");}235
catch(ClassNotFoundException e){}236
try{237
Con=DriverManager.getConnection("jdbc:odbc:test","gxy","ookk");238
Stmt=Con.createStatement();239
}240
catch(SQLException ee) {}241
待查英文单词_文本条=new TextField(16);242
汉语解释_文本条=new TextField(16);243
更新英文单词_文本条=new TextField(16);244
更新汉语解释_文本条=new TextField(16);245
填加英文单词_文本条=new TextField(16);246
填加汉语解释_文本条=new TextField(16); 247
查询按扭=new Button("查询");248
更新按扭=new Button("更新");249
填加按扭=new Button("填加");250
Panel p1=new Panel(),p2=new Panel(),p3=new Panel();251
p1.add(new Label("输入要查询的英语单词:"));252
p1.add( 待查英文单词_文本条);253
p1.add(new Label("显示英语单词的汉语解释:"));254
p1.add(汉语解释_文本条);255
p1.add(查询按扭);256
p2.add(new Label("输入英语单词:"));p2.add( 更新英文单词_文本条);257
p2.add(new Label("输入该单词更新的汉语解释:"));258
p2.add(更新汉语解释_文本条);259
p2.add(更新按扭);260
p3.add(new Label("输入英语单词:"));p3.add( 填加英文单词_文本条);261
p3.add(new Label("输入汉语解释:"));p3.add(填加汉语解释_文本条);262
p3.add(填加按扭);263
add(p1);add(p2);add(p3);264
查询按扭.addActionListener(this);更新按扭.addActionListener(this);265
填加按扭.addActionListener(this);266
addWindowListener(new WindowAdapter()267
{public void windowClosing(WindowEvent e)268
{setVisible(false);System.exit(0); } } );269
}270
public void actionPerformed(ActionEvent e)271
{if(e.getSource()==查询按扭)272
{ 查询记录=0;273
try{ 查询();}274
catch(SQLException ee) {}275
}276
else if(e.getSource()==更新按扭)277
{ try{ 更新();}278
catch(SQLException ee) {}279
}280
else if(e.getSource()==填加按扭)281
{ try{ 填加();}282
catch(SQLException ee) {}283
}284
}285
public void 查询() throws SQLException286
{ String cname,ename;287
Con=DriverManager.getConnection("jdbc:odbc:test","gxy","ookk");288
ResultSet rs=Stmt.executeQuery("SELECT * FROM 表1 "); 289
while (rs.next())290
{ ename=rs.getString("单词"); cname=rs.getString("解释");291
if(ename.equals( 待查英文单词_文本条.getText().trim()))292
{ 汉语解释_文本条.setText(cname);查询记录=1; break;293
} 294
}295
Con.close();296
if(查询记录==0)297
{ 汉语解释_文本条.setText("没有该单词"); 298
}299
}300
public void 更新() throws SQLException301
{ String s1="'"+更新英文单词_文本条.getText().trim()+"'",302
s2="'"+更新汉语解释_文本条.getText().trim()+"'";303
String temp="UPDATE 表1 SET 解释 ="+s2+" WHERE 单词 = "+s1 ;304
Con=DriverManager.getConnection("jdbc:odbc:test","gxy","ookk");305
Stmt.executeUpdate(temp); Con.close();306
} 307
public void 填加() throws SQLException308
{ String s1="'"+填加英文单词_文本条.getText().trim()+"'",309
s2="'"+填加汉语解释_文本条.getText().trim()+"'";310
String temp="INSERT INTO 表1 VALUES ("+s1+","+s2+")";311
Con=DriverManager.getConnection("jdbc:odbc:test","gxy","ookk");312
Stmt.executeUpdate(temp); 313
Con.close();314
}315
}316
public class Database317
{ public static void main(String args[])318
{DataWindow window=new DataWindow();window.pack();319
}320
}321
322
//例子8323
(1) 客户端程序（效果如图23.11）324
import java.net.*;import java.io.*;325
import java.awt.*;import java.awt.event.*;326
import java.applet.*;327
public class Database_client extends Applet implements Runnable,ActionListener328
{ Button 查询;TextField 英文单词_文本框,汉语解释_文本框;329
Socket socket=null;330
DataInputStream in=null;331
DataOutputStream out=null;332
Thread thread; 333
public void init()334
{查询=new Button("查询");335
英文单词_文本框=new TextField(10);汉语解释_文本框=new TextField(10);336
add(new Label("输入要查询的英文单词"));add(英文单词_文本框);337
add(new Label("汉语解释："));add(汉语解释_文本框);add(查询);338
查询.addActionListener(this);339
}340
public void start()341
{ try342
{socket = new Socket(this.getCodeBase().getHost(), 4331);343
in = new DataInputStream(socket.getInputStream());344
out = new DataOutputStream(socket.getOutputStream());345
} 346
catch (IOException e){}347
if (thread == null)348
{thread = new Thread(this);349
thread.setPriority(Thread.MIN_PRIORITY);350
thread.start();351
}352
}353
public void stop()354
{try{out.writeUTF("客户离开");}355
catch(IOException e1){} 356
} 357
public void destroy()358
{try{out.writeUTF("客户离开");}359
catch(IOException e1){} 360
} 361
public void run()362
{String s=null;363
while(true)364
{ try{s=in.readUTF();365
}366
catch (IOException e)367
{汉语解释_文本框.setText("与服务器已断开");break;368
}369
汉语解释_文本框.setText(s);370
}371
}372
public void actionPerformed(ActionEvent e)373
{if (e.getSource()==查询)374
{ String s=英文单词_文本框.getText();375
if(s!=null) 376
{ try{out.writeUTF(s);}377
catch(IOException e1){} 378
} 379
380
}381
}382
}383
(2) 服务器端程序：384
import java.io.*;import java.net.*;385
import java.util.*;import java.sql.*;386
public class Database_server 387
{ public static void main(String args[])388
{ ServerSocket server=null;Server_thread thread;389
Socket you=null;390
while(true) 391
{ try{ server=new ServerSocket(4331);392
}393
catch(IOException e1) {System.out.println("正在监听");} 394
try{ you=server.accept();395
}396
catch (IOException e)397
{System.out.println("正在等待客户");398
}399
if(you!=null) 400
{new Server_thread(you).start(); 401
}402
else {continue;}403
}404
}405
}406
class Server_thread extends Thread407
{ Socket socket;Connection Con=null;Statement Stmt=null;408
DataOutputStream out=null;DataInputStream in=null;409
String s=null;410
Server_thread(Socket t)411
{ socket=t;412
try {in=new DataInputStream(socket.getInputStream());413
out=new DataOutputStream(socket.getOutputStream());414
}415
catch (IOException e) {}416
try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");417
}418
catch(ClassNotFoundException e)419
{420
}421
try { Con=DriverManager.getConnection("jdbc:odbc:test","gxy","ookk");422
Stmt=Con.createStatement();423
}424
catch(SQLException ee) {}425
} 426
public void run() 427
{ while(true)428
{try{ s=in.readUTF();429
int n=0;430
ResultSet rs=431
Stmt.executeQuery("SELECT * FROM 表1 WHERE 单词 ="+"'"+s+"'" );432
while (rs.next())433
{ String 英语单词=rs.getString("单词");434
if(s.equals(英语单词))435
{ out.writeUTF(rs.getString("解释")); n=1;break; 436
}437
if(n==0) {out.writeUTF("没有此单词");}438
}439
sleep(45);440
}441
catch(Exception ee) 442
{ break;443
}444
445
} 446
}447
}448
