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servelet 连接mysql

2015-08-04 10:39 627 查看

package helloworld;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
*/
@WebServlet("/HelloWorld")
public class HelloWorld extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* Default constructor.
*/
public HelloWorld() {
// TODO Auto-generated constructor stub

}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

Connection conn = null;
Statement stmt = null;
ResultSet rs = null;

response.setContentType("text/html");
response.setCharacterEncoding("gb2312");
PrintWriter out = response.getWriter();

out.println("<table border=1>");
out.println("<tr><td>查询结果</td></tr>");
try{
Class.forName("com.mysql.jdbc.Driver"); //lib
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/gs?user=root&password=root");
stmt = conn.createStatement();
rs = stmt.executeQuery("select * from user");
while(rs.next()){
out.println("<tr>");
out.println("<td>"+rs.getString("name")+"</td>");
out.println("</tr>");
}
out.println("</table>");
}catch (ClassNotFoundException e){
e.printStackTrace();
}catch (SQLException e){
e.printStackTrace();
}
finally{
try{
if(rs !=null){
rs.close();
rs=null;
}
if(stmt != null){
stmt.close();
stmt=null;
}
if(conn!=null){
conn.close();
conn=null;
}
}
catch(SQLException e){
e.printStackTrace();

}
}

}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

PrintWriter out = response.getWriter();
out.println("<html><head><title>helloworld</title><head><body>hello world!!!</body></html>");

}

}

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