Java实现登录验证：编写LoginServlet并返回JSON结果

```java import javax.servlet.*; import javax.servlet.http.*; import java.io.IOException; import java.io.PrintWriter; public class LoginServlet extends HttpServlet { @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 设置响应内容类型为JSON response.setContentType("application/json"); response.setCharacterEncoding("UTF-8"); // 获取用户名和密码 String username = request.getParameter("username"); String password = request.getParameter("password"); // 假设正确的用户名和密码是admin和123456 String correctUsername = "admin"; String correctPassword = "123456"; // 创建输出流 PrintWriter out = response.getWriter(); // 判断用户名和密码是否正确 if (correctUsername.equals(username) && correctPassword.equals(password)) { // 登录成功，返回成功的JSON数据 out.print("{code:1, msg:'success'}"); } else { // 登录失败，返回失败的JSON数据 out.print("{code:0, msg:'failure'}"); } // 关闭输出流 out.flush(); out.close(); } } ``` ######[AI写代码神器 | 329点数解答 | 2024-11-05 16:36:31]