📄 queryresultofpage.java
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import java.io.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class QueryResultOfPage extends HttpServlet {
int count=0;
int pagecount=4;
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws IOException, ServletException {
int rowcount=0;
boolean hasmore=false;
String uri=req.getRequestURI();
res.setContentType("text/html;charset=GB2312");
PrintWriter outh = res.getWriter();
outh.println("<HTML><BODY>");
outh.println("<CENTER><H1>");
outh.println("学生表中的记录:</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 * from student");
ResultSetMetaData rsmd=rst.getMetaData();
int columns=rsmd.getColumnCount();
outh.println("<TABLE ALIGN=CENTER BORDER=1>");
outh.println("<TR>");
for(int i=1;i<=columns;i++) {
outh.println("<TH>"+rsmd.getColumnLabel(i));
outh.println("</TH>");
}
outh.println("</TR>\n");
while(rst.next()) {
rowcount++;
if(rowcount>count*pagecount && rowcount<=(count+1)*pagecount) {
outh.println("<TR>");
for(int i=1;i<=columns;i++) {
outh.println("<TD>");
outh.println(rst.getString(i));
outh.println("</TD>");
}
outh.println("</TR>");
}
if(rowcount>(count+1)*pagecount) {
hasmore=rst.next();
break;
}
}
outh.println("</TABLE>");
outh.println("</CENTER>");
outh.println("</BODY></HTML>");
}
catch(SQLException e) {
outh.println("数据库连接失败!");
}
if(hasmore) {
outh.println("<BR>");
outh.println("<CENTER>");
outh.println("<FORM METHOD=GET"+"ACTION\""+uri+"\">");
outh.println("<INPUT TYPE=\"Submit\" VALUE=\"Next\">");
outh.println("</FORM>");
outh.println("</Center>");
}
else
outh.println("\n<CENTER><H2>数据显示完毕</H2></CENTER>");
outh.println("</BODY></HTML>");
outh.flush();
count++;
}
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