📄 choicejserv.java
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import java.io.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
class FMTQueryResult {
private ResultSet resp;
public FMTQueryResult(ResultSet resp) {
this.resp=resp;
}
public String toFMT() {
StringBuffer buff=new StringBuffer();
buff.append("<TABLE ALIGN=CENTER BORDER=1>");
try {
ResultSetMetaData rsmd=resp.getMetaData();
int columns=rsmd.getColumnCount();
buff.append("<TR>");
for(int i=1;i<=columns;i++)
buff.append("<TH>"+rsmd.getColumnLabel(i));
buff.append("</TR>\n");
while(resp.next()) {
buff.append("<TR>");
for(int i=1;i<=columns;i++) {
Object columnvalue=resp.getObject(i);
if(columnvalue !=null)
buff.append("<TD ALIGN=CENTER>"+columnvalue.toString()+"</TD>");
else
buff.append("<TD></TD>");
}
buff.append("</TR>");
}
buff.append("</TABLE>");
}
catch(SQLException e) {
buff.append("</TABLE>数据库连接错误"+"<BR>");
}
return buff.toString();
}
}
public class ChoiceJserv extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws IOException, ServletException {
res.setContentType("text/html;charset=GB2312");
PrintWriter outh = res.getWriter();
outh.println("<HTML><BODY>");
outh.println("<CENTER><H1>");
outh.println("学生选课情况一览表</H1>");
String driver = "org.gjt.mm.mysql.Driver";
String url = "jdbc:mysql://127.0.0.1:3306/jxgl";
String user = "sb";
String password = "songbo";
try {
Class.forName(driver);
}
catch(Exception e) {
outh.println("不能加载驱动程序:" + driver);
}
try {
Connection con = DriverManager.getConnection(url,user,password);
Statement smt = con.createStatement();
ResultSet rst = smt.executeQuery("select student.s_no,student.s_name,class.class_name,course.course_name,choice.score,teacher.t_name from student,class,course,choice,teacher,teaching WHERE student.class_no=class.class_no and student.s_no=choice.s_no and choice.course_no=course.course_no and choice.course_no=teaching.course_no and teaching.t_no=teacher.t_no;");
FMTQueryResult rstl=new FMTQueryResult(rst);
outh.println(rstl.toFMT());
outh.println("</CENTER>");
outh.println("</BODY></HTML>");
}
catch(SQLException e) {
outh.println("数据库连接失败!");
}
}
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