从servlet调用Java函数，函数赢得'；不执行

我正在用JSP和Java（servlet）创建一个简单的Maven web应用程序。我的webapp的功能是通过DB搜索在其中注册的人员。它根据ID或名称进行搜索。因此，我有一个JSP，它带有一个表单，可以将数据发送到我的servlet，在servlet中，我从一个Java类调用一个函数，该类创建DB连接并获取数据

但是我提到这个函数从来没有调用过或者其他什么，我不知道怎么做。有人能帮忙吗

web.xml

：

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>
  <servlet>
    <servlet-name>TestServlet</servlet-name>
    <display-name>TestServlet</display-name>
    <description></description>
    <servlet-class>mvnproject.servlet.TestServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>TestServlet</servlet-name>
    <url-pattern>/TestServlet</url-pattern>
  </servlet-mapping>
</web-app>

Java功能：

import java.sql.*;

public class Functions {
  public void dbConn(String nVal, String inpVal){

    System.out.println("Running function...");

    if(nVal != null || inpVal != null){
        String sqlSerch;
        if(nVal.equals("name")){
            sqlSerch = "ID, aNaam FROM profiles WHERE naam = " + nVal;
        }else{
            sqlSerch = "naam, aNaam FROM profiles WHERE ID = " + nVal;
        }

        //driver / db path
            final String JDBC_DRIVER = "com.mysql.jdbc.Driver";  
            final String DB_URL = "jdbc:mysql://localhost/profile";
            //DB user&password
            final String USER = "root";
            final String PASS = "Ciber2015!";
            //declare con & sql var
            Connection conn = null;
            Statement stmt = null;
            //register jdbc driver
            try{
                Class.forName(JDBC_DRIVER);
                //make a connection
                conn = DriverManager.getConnection(DB_URL,USER,PASS);
                //SQL Statement
                stmt = conn.createStatement();
                String sql = "SELECT"+ sqlSerch;
                ResultSet rs = stmt.executeQuery(sql);

                //Declareer variablen met data uit db
                int id = rs.getInt("id");
                String naam = rs.getString("naam");

                System.out.println(id + naam);

            }catch(Exception e){
                System.out.println("Eception");
            }           

            System.out.println(" - " + nVal + " - " + inpVal);              
    }
}

---

如果我做错了什么，请告诉我。

那么对于那些感兴趣的人， 问题不是我的代码，而是eclipse。 在保存新项目时，它正在运行我项目的旧版本。

---

感谢您抽出宝贵的时间，温柔的（wo）男人

完整的servlet代码，包括web.xml代码片段？请查看！您的表单操作必须映射到您的servlet在den web.xml中注册的url模式。您在控制台中看到

调用db conn函数

和

脚本完成

消息，我是否理解正确，但是没有

正在运行的函数…

在中间？没有打印调用db函数以及它之后的所有内容没有显示在console@swinkler我的servlet被称为“我敢肯定，糟糕！这就是我为JRebel付费的原因；-）是的，我不想付钱：哈哈，我只是一个学生，我只是想给出对我有用的“解决方案”，但不会再发生了。

package mvnproject.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.catalina.connector.Request;

/**
 * Servlet implementation class TestServlet
 */
public class TestServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public TestServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.getWriter().append("Served at: ").append(request.getContextPath());

        Functions f = new Functions();

        String name = request.getParameter("serchOn");
        String input = request.getParameter("input");
        System.out.println(" " + name + " " + input);
        System.out.println("calling db conn function");
        f.dbConn(name, input);
        System.out.println("Script completed");

    }



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



    }

}

import java.sql.*;

public class Functions {
  public void dbConn(String nVal, String inpVal){

    System.out.println("Running function...");

    if(nVal != null || inpVal != null){
        String sqlSerch;
        if(nVal.equals("name")){
            sqlSerch = "ID, aNaam FROM profiles WHERE naam = " + nVal;
        }else{
            sqlSerch = "naam, aNaam FROM profiles WHERE ID = " + nVal;
        }

        //driver / db path
            final String JDBC_DRIVER = "com.mysql.jdbc.Driver";  
            final String DB_URL = "jdbc:mysql://localhost/profile";
            //DB user&password
            final String USER = "root";
            final String PASS = "Ciber2015!";
            //declare con & sql var
            Connection conn = null;
            Statement stmt = null;
            //register jdbc driver
            try{
                Class.forName(JDBC_DRIVER);
                //make a connection
                conn = DriverManager.getConnection(DB_URL,USER,PASS);
                //SQL Statement
                stmt = conn.createStatement();
                String sql = "SELECT"+ sqlSerch;
                ResultSet rs = stmt.executeQuery(sql);

                //Declareer variablen met data uit db
                int id = rs.getInt("id");
                String naam = rs.getString("naam");

                System.out.println(id + naam);

            }catch(Exception e){
                System.out.println("Eception");
            }           

            System.out.println(" - " + nVal + " - " + inpVal);              
    }
}