package mycode;
import java.sql.*
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Login extends HttpServlet {
private static final long serialVersionUID = -4546189621945422719L;
String URL = "jdbc:mysql://127.0.0.1";
String USER = "root";
String PASS = "1234";
@Override
protected void doGet(HttpServletRequest req,HttpServletResponse res)
throws IOException,ServletException{
}
public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
String username = req.getParameter("username");
String password = req.getParameter("password");
res.setContentType("text/html");
PrintWriter out = res.getWriter();
try {
Connection con = DriverManager.getConnection(URL, USER, PASS);
String sql = "INSERT INTO cloud.cloud_table (Username,Password)" +
"VALUES (?, ?)";
PreparedStatement pst = con.prepareStatement(sql);
pst.setString(1, username);
pst.setString(2, password);
pst.executeUpdate();
out.println("<html><body>");
out.println("THANKS FOR CREATING AN ACCOUNT");
out.println("</body></html>");
}
catch (SQLException ex) {
ex.printStackTrace();
}
}
}
<?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>Login</display-name>
<servlet>
<servlet-name>Login</servlet-name>
<servlet-class>mycode.Login</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Login</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
+----------+----------+
| Username | Password |
+----------+----------+
| | |
+----------+----------+
<form action="login" method="GET">
<div>
<h4>Please enter your password and username</h4>
</div>
<div>
Username <input name="username" type="text" />
</div>
<div>
Password <input name="password" type="text" />
</div>
<div>
<input type="submit" value="Submit" />
</div>
</form>
使用 java 和 tomcat，我有一个接受用户名和密码的简单表单。我希望能够从表单中检索用户名和密码并将其插入到 mysql 数据库中。但是，现在单击表单上的提交按钮后，什么也没有发生，数据库也没有更新。数据库连接工作正常，所以我不确定现在的问题是什么。任何帮助将不胜感激。
最佳答案
您正在从 HTML 表单调用 GET 方法。
将您的操作更改为 POST。
<form action="login" method="POST">
关于java - Tomcat/Java - 插入 mysql 数据库，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/43327342/