您好我正在尝试运行servlet
,它从简单的html表单中获取数据并存储在oracle数据库中并显示消息“Data Saved”。我正在使用Eclipse Luna,Tomcat 7.0和Oracle 11g Express Edition。当我运行该程序时,我收到此错误。
java.sql.SQLException:Io异常:从读取调用中减去一个 在与oracle 11g的JDBC连接期间
这是我的web.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>StudentManagement</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>StudentRegServlet</servlet-name>
<servlet-class>com.serv.pkg.StudentRegServlet</servlet-class>
<init-param>
<description></description>
<param-name>username</param-name>
<param-value>scott</param-value>
</init-param>
<init-param>
<param-name>password</param-name>
<param-value>tiger</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>StudentRegServlet</servlet-name>
<url-pattern>/stdreg</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>CourseRegServlet</servlet-name>
<servlet-class>com.serv.pkg.CourseRegServlet</servlet-class>
<init-param>
<param-name>username</param-name>
<param-value>test</param-value>
</init-param>
<init-param>
<param-name>password</param-name>
<param-value>test</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>CourseRegServlet</servlet-name>
<url-pattern>/coursereg</url-pattern>
</servlet-mapping>
<context-param>
<param-name>driver</param-name>
<param-value>oracle.jdbc.OracleDriver</param-value>
</context-param>
<context-param>
<param-name>url</param-name>
<param-value>jdbc:oracle:thin:@localhost:8080:XE</param-value>
</context-param>
</web-app>
我的Servlet
package com.serv.pkg;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import javax.servlet.GenericServlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebServlet;
/**
* Servlet implementation class CourseRegServlet
*/
@WebServlet("/CourseRegServlet")
public class CourseRegServlet extends GenericServlet {
private Connection conn;
@Override
public void init(ServletConfig config)throws ServletException
{
System.out.println("Executing init method from coursereg.html");
ServletContext sc = config.getServletContext( );
String driver=sc.getInitParameter("driver");
String url=sc.getInitParameter("url");
String username=config.getInitParameter("username");
String password=config.getInitParameter("password");
try {
Class.forName(driver);
System.out.println("driver loaded");
conn=DriverManager.getConnection(url, username, password );
} catch ( Exception e) {
System.out.println("catching from init" +e);
}
}
public void service(ServletRequest request, ServletResponse response) throws ServletException, IOException {
PrintWriter out = response.getWriter();
System.out.println("Executing service method from coursereg.html");
int cid = Integer.parseInt(request.getParameter("cid"));
String c_name = request.getParameter("c_name");
int fee = Integer.parseInt(request.getParameter("fee"));
try {
System.out.println("exe1");
PreparedStatement stmt=conn.prepareStatement("insert into course values(?,?,?)");
System.out.println("exe2");
stmt.setInt(1, cid);
stmt.setString(2, c_name);
stmt.setInt(3, fee);
int i = stmt.executeUpdate();
if(i!=0){
System.out.println("course registered");
}else
{
System.out.println("registration failed");
}
} catch ( Exception e) {
System.out.println(e);
}
out.println("Data saved");
}
public void destroy(){
try {
System.out.println("Executing destroy method from coursereg.html");
conn.close();
} catch ( Exception e) {
System.out.println(e);
}
}
}
答案 0 :(得分:1)
数据库侦听器的默认端口是1521,而不是8080(这是XML DB中的默认HTTP端口);所以你的网址应该是:
<param-value>jdbc:oracle:thin:@localhost:1521:XE</param-value>
如果您的侦听器位于非标准端口上,请使用该端口。此外,:XE
部分意味着它将尝试与SID XE连接。您可能更喜欢使用服务名称,希望也是XE,它将用斜杠而不是冒号表示:
<param-value>jdbc:oracle:thin:@localhost:1521/XE</param-value>