使用Javaservlet访问MySQL？

解决方案：

我添加了这个代码

Class.forName("com.mysql.jdbc.Driver");

布雷弗

Connection con = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test", "root", "root");

谢谢大家回答我的问题

====================

我遇到了问题，我尝试使用servlet将数据插入mysql数据库，但我无法访问mysql

• 数据库名称：test
• 表名：测试
• 我已经将jdbc连接器添加到项目库中
• 我使用的是JDK1.7、NetBeans7.3、MySQL 5.6、Tomcat7.0、Connector/J5.1.24

1-这是sign\u.jsp页面中的“表单操作”：

<form action="RegisterUser" method="post">
    <td><input type="submit" value="Submit"></td>
</form>

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.mysql.jdbc.Driver;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.logging.Level;
import java.util.logging.Logger;

@WebServlet(urlPatterns = {"/RegisterUser"})
public class RegisterUser extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException, SQLException {

    try{
        Connection con = DriverManager.getConnection("jdbc:mysql://localhost/test", "root", "root");
        Statement s = (Statement) con.createStatement();

        String name = "Hassan3";
        int phone = 123456;

        String insert = "INSERT INTO test VALUES ('\" + name + \"', \" + phone + \")";

        s.executeUpdate(insert);

        s.close();
        con.close();

    }catch(Exception e){
        throw new SecurityException("Class not found " + e.toString());
    }
}

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    try {
        processRequest(request, response);
    } catch (SQLException ex) {
        Logger.getLogger(RegisterUser.class.getName()).log(Level.SEVERE, null, ex);
    }
}

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    try {
        processRequest(request, response);
    } catch (SQLException ex) {
        Logger.getLogger(RegisterUser.class.getName()).log(Level.SEVERE, null, ex);
    }
}

@Override
public String getServletInfo() {
    return "Short description";
}// </editor-fold>

HTTP Status 500 - Class not found java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost/test

type Exception report

message Class not found java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost/test

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

exception
java.lang.SecurityException: Class not found java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost/test
    RegisterUser.processRequest(RegisterUser.java:66)
    RegisterUser.doPost(RegisterUser.java:173)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

note The full stack trace of the root cause is available in the Apache Tomcat/7.0.39 logs.

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;

public class Test {
    public static void main(String[] args){
    try{
        Connection con = DriverManager.getConnection("jdbc:mysql://localhost/test", "root", "root");
        Statement s = (Statement) con.createStatement();

        String name = "Hassan4";
        int phone = 8985895;

        String insert = "INSERT INTO test VALUES ('" + name + "', " + phone + ")";

        s.executeUpdate(insert);

        s.close();
        con.close();
        System.out.println("done");
    }catch(Exception e){
        throw new SecurityException("Class not found " + e.toString());
    }
}

4-但当我使用相同的代码，但在java文件中“没有servlet或web应用程序”时，它工作正常：

<form action="RegisterUser" method="post">
    <td><input type="submit" value="Submit"></td>
</form>

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.mysql.jdbc.Driver;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.logging.Level;
import java.util.logging.Logger;

@WebServlet(urlPatterns = {"/RegisterUser"})
public class RegisterUser extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException, SQLException {

    try{
        Connection con = DriverManager.getConnection("jdbc:mysql://localhost/test", "root", "root");
        Statement s = (Statement) con.createStatement();

        String name = "Hassan3";
        int phone = 123456;

        String insert = "INSERT INTO test VALUES ('\" + name + \"', \" + phone + \")";

        s.executeUpdate(insert);

        s.close();
        con.close();

    }catch(Exception e){
        throw new SecurityException("Class not found " + e.toString());
    }
}

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    try {
        processRequest(request, response);
    } catch (SQLException ex) {
        Logger.getLogger(RegisterUser.class.getName()).log(Level.SEVERE, null, ex);
    }
}

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    try {
        processRequest(request, response);
    } catch (SQLException ex) {
        Logger.getLogger(RegisterUser.class.getName()).log(Level.SEVERE, null, ex);
    }
}

@Override
public String getServletInfo() {
    return "Short description";
}// </editor-fold>

HTTP Status 500 - Class not found java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost/test

type Exception report

message Class not found java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost/test

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

exception
java.lang.SecurityException: Class not found java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost/test
    RegisterUser.processRequest(RegisterUser.java:66)
    RegisterUser.doPost(RegisterUser.java:173)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

note The full stack trace of the root cause is available in the Apache Tomcat/7.0.39 logs.

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;

public class Test {
    public static void main(String[] args){
    try{
        Connection con = DriverManager.getConnection("jdbc:mysql://localhost/test", "root", "root");
        Statement s = (Statement) con.createStatement();

        String name = "Hassan4";
        int phone = 8985895;

        String insert = "INSERT INTO test VALUES ('" + name + "', " + phone + ")";

        s.executeUpdate(insert);

        s.close();
        con.close();
        System.out.println("done");
    }catch(Exception e){
        throw new SecurityException("Class not found " + e.toString());
    }
}

}

---

那么servlet有什么问题呢为什么代码与java应用程序一起工作。但是它不适用于web应用程序。？

首先，您应该将其放入持久层

1） 确保JDBC驱动程序已就位。将其复制到类路径中，例如/WEB-INF/lib目录。链接：

---

2） 检查您的连接字符串：

jdbc:mysql://://

，看起来端口丢失。尝试

jdbc：mysql://127.0.0.1:3306/test

David是对的，我想补充一点，您也可以通过将jar文件粘贴到java的安装文件夹中来安装驱动程序

\Program Files\Java\jre7\lib\ext  

---

我不太喜欢mysql，总是在WindowsServer2008上使用Mssql。这是我使用的代码，我可能是你的答案，因为mysql连接的工作原理与sql几乎相同

 Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
 conn = DriverManager.getConnection("jdbc:sqlserver://localhost:1433;databaseName="+database+";user="+user+";password="+password);

---

您得到的

类未找到java.sql.SQLException:未找到适合jdbc的驱动程序：mysql://localhost/test

这意味着当您从Web应用程序运行它时，JRE在类路径中找不到类

如果此代码在单机版中工作，则意味着您需要有一个包含c

om.mysql.jdbc.Driver

类（所谓的jdbc驱动程序）的JAR文件。这个罐子需要在Tomcat中可见。因此，我建议将

mysql jdbc.jar

放在项目的

/WEB-INF/lib

目录的物理位置

或者，您可以在这里使用添加第三方库，如JDBC驱动程序

右键单击项目名称-->属性

从您的

NetBeans

IDE

那么重启Tomcat应该可以工作了

第二，你不需要

import com.mysql.jdbc.Driver;

---

在您的Servlet中。

MySQL在端口3306中工作，同样的代码（逐字符）在JAVA应用程序中工作。正确，只有在servlet“WEB App”中使用它时才出现问题。谢谢你的回答。你在哪里复制了驱动程序？该文件的名称是什么？（mysql-connector-java-5.1.24-bin.jar）我将其复制到（\Program Files\java\jre7\lib\ext）我也尝试将其复制到（/WEB-INF/lib）我认为连接器文件或本地主机没有问题：3306，'因为它在java应用程序中工作，问题只存在于（使用Servlet的WEB应用程序）中，您尝试清理，重新发布并重新启动tomcat？我已经将连接器jar添加到此目录（\Program Files\Java\jre7\lib\ext），然后将其添加到NetBeans中的mu项目（库->添加jar/文件夹）中。我还尝试将其添加到此目录（WEB-INF/lib）中。我不太喜欢mysql，总是在windows server 2008中使用Mssql。这是我用于此目的的代码，我可能是您的答案，因为mysql连接的工作原理与sql几乎相同，请参阅我的后可能副本的编辑