tomcat7解决package javax.servlet does not exist的问题

本文介绍了解决在Tomcat7环境下编译Java程序时出现的“package javax.servlet does not exist”错误的方法。通过设置环境变量classpath指向servlet-api.jar文件的位置来解决此问题。

tomcat7版本,CMD下编译javac HelloWorld.java时,

弹出错误 package javax.servlet does not exist

 

解决办法。

假设tomcat解压到目录C:/tomcat-7.0.12,那么C:/tomcat-7.0.12/lib下面一定有servlet-api.jar

 

环境变量classpath追加C:/tomcat-7.0.12/lib/servlet-api.jar

然后重起就可以了。

package cn.itcast.session.entity; public class User { private String username; private String password; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } } package cn.itcast.session.servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import cn.itcast.session.entity.User; @WebServlet(name = “IndexServlet”, urlPatterns = “/IndexServlet”) public class IndexServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=utf-8"); // 解决乱码问题 // 获取保存有用户信息的Session对象 HttpSession session = request.getSession(); User user = (User) session.getAttribute("user"); if (user == null) { response.getWriter().print("<a href='/chapter05/login.html'>登录</a>"); } else { response.getWriter().print("您已登录,欢迎你," + user.getUsername() + "!"); response.getWriter().print("<a href='/chapter05/LogoutServlet'>退出</a>"); // 创建Cookie,存放Session的标识 Cookie cookie = new Cookie("JSESSIONID", session.getId()); cookie.setMaxAge(60 * 30); cookie.setPath("/chapter05"); response.addCookie(cookie); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } } package cn.itcast.session.servlet; import java.io.IOException; import java.io.PrintWriter; 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 javax.servlet.http.HttpSession; import cn.itcast.session.entity.User; @WebServlet(name = “LoginServlet”, urlPatterns = “/LoginServlet”) public class LoginServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=utf-8"); String username = request.getParameter("username"); String password = request.getParameter("password"); PrintWriter pw = response.getWriter(); // 假设正确的用户名是itcast,密码是123 if ("itcast".equals(username) && "123".equals(password)) { User user = new User(); user.setUsername(username); user.setPassword(password); HttpSession session = request.getSession(); session.setAttribute("user", user); response.sendRedirect("/chapter05/IndexServlet"); } else { pw.write("用户名或密码错误,登录失败"); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } } package cn.itcast.session.servlet; 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 javax.servlet.http.HttpSession; @WebServlet(name = “LogoutServlet”, urlPatterns = “/LogoutServlet”) public class LogoutServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 将Session对象的User对象移除 request.getSession().removeAttribute("user"); response.sendRedirect("/chapter05/IndexServlet"); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } } <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta http-equiv="Content-Type" content="text/html"> <title>登录</title> </head> <body> <form name="reg" action="http://localhost:8080/webcast/LoginServlet" method="post"> 用户:<input name="username" type="text"/><br/> 密码:<input name="password" type="password"/><br/> <input type="submit" value="提交" /><br/> </form> </body> </html> 改写代码,要在jdk21,tomcat10.1,idea2023的版本中创建
最新发布
11-06
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