eclipseservletmysql_关于eclipse中servlet通过jdbc连接mysql数据库问题。

在连接数据库的时候报出这样的错误&＃xff0c;实在不知道是什么地方有错求解源码连接是这样的request.setCharacterEncoding("utf-8");Stringname&＃61;request.getParameter("name");Stringtitle&＃61;re...

在连接数据库的时候报出这样的错误&＃xff0c;实在不知道是什么地方有错求解

源码连接是这样的

request.setCharacterEncoding("utf-8");

String name&＃61;request.getParameter("name");

String title&＃61;request.getParameter("title");

String message&＃61;request.getParameter("message");

DataSource ds&＃61;null;

try {

Context context&＃61;new InitialContext();

ds&＃61;(DataSource)context.lookup("java:/comp/enw/jdbc/mysqlds");

} catch (Exception e) {

System.out.println("获取的数据出错");

}

try {

Connection conn&＃61;ds.getConnection();

String sql&＃61;"insert into weblog (name,title,message,created_time)values(?,?,?,now())";

PreparedStatement pstmt&＃61;conn.prepareStatement(sql);

pstmt.setString(1, name);

pstmt.setString(2, title);

pstmt.setString(3, message);

int result&＃61;pstmt.executeUpdate();

System.out.println(result);

报错结果&＃xff1a;

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

java.lang.NullPointerException

com.conntest.Connservlet.doPost(Connservlet.java:46)

javax.servlet.http.HttpServlet.service(HttpServlet.java:710)

javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

展开