Java servlett映射

你好，我有一个嵌入式Tomcat java应用程序。tomcat启动并显示index.jsp

现在我有一个ajax请求，如下所示：

function auth(){
username = document.getElementById('login_username').value;
password = document.getElementById('login_pw').value;

if(username.length > 0 && password.length > 0){
   $.ajax({
        method: "POST",
        url: '/login',
        data: 'username=' + username + '&password=' + password
    }).done(function(response){
        console.log(response);
        response = response.split(',');
        if(response.length == 2){
            window.location = response[1];
        }
    });
}

@WebServlet(
        name="login",
        urlPatterns = {"/login","sites/login","login"}
)
public class LoginServlet extends HttpServlet{
    private static final long serialVersionUID = 1L;
    private ServletContext context;

    public LoginServlet(){
        super();
    }

    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        Log.log("get");
        resp.setContentType("text/html");  
        PrintWriter out=resp.getWriter(); 
        Page p = new Page();
        p.getBody().setContent("GET");
        out.print(p.create());
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        Log.log("Post");
        resp.setContentType("text/html");  
        PrintWriter out=resp.getWriter(); 
        Page p = new Page();
        p.getBody().setContent("POST");
        out.print(p.create());
    }

    public void init(ServletConfig config)throws ServletException{
        this.context = config.getServletContext();
        Log.log("Login servlet Initialized");
    }
}

}

auth（）可以工作。但每次我都会遇到404错误

应获取请求的servlet如下所示：

function auth(){
username = document.getElementById('login_username').value;
password = document.getElementById('login_pw').value;

if(username.length > 0 && password.length > 0){
   $.ajax({
        method: "POST",
        url: '/login',
        data: 'username=' + username + '&password=' + password
    }).done(function(response){
        console.log(response);
        response = response.split(',');
        if(response.length == 2){
            window.location = response[1];
        }
    });
}

@WebServlet(
        name="login",
        urlPatterns = {"/login","sites/login","login"}
)
public class LoginServlet extends HttpServlet{
    private static final long serialVersionUID = 1L;
    private ServletContext context;

    public LoginServlet(){
        super();
    }

    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        Log.log("get");
        resp.setContentType("text/html");  
        PrintWriter out=resp.getWriter(); 
        Page p = new Page();
        p.getBody().setContent("GET");
        out.print(p.create());
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        Log.log("Post");
        resp.setContentType("text/html");  
        PrintWriter out=resp.getWriter(); 
        Page p = new Page();
        p.getBody().setContent("POST");
        out.print(p.create());
    }

    public void init(ServletConfig config)throws ServletException{
        this.context = config.getServletContext();
        Log.log("Login servlet Initialized");
    }
}

我的问题是，为什么这不起作用。我必须使用Tomcat.addServlet（string，string，string）方法将servlet添加到Tomcat中吗

如果我在webapp的基本文件夹中创建login.jsp，并且将ajax请求的url更改为login.jsp，那么它就可以工作

---

谢谢问题在于

$.ajax（）

调用中的参数

url:'/login'

，该调用在

http://localhost:8080/login

，因为开头有

/

（斜杠符号）

您很可能希望它类似于

http://localhost:8080/MyServletApp/login

。要实现此目的，请从

url

中删除

/

ajax函数调用如下所示：

$.ajax({
    method: "POST",
    url: 'login',
    data: 'username=' + username + '&password=' + password
}).done(function(response){
    console.log(response);
    response = response.split(',');
    if(response.length == 2){
        window.location = response[1];
    }
});

问题解决了

---

首先，我发现注释适用于3.0以上的Web.xml版本。因此，我尝试将Web.xml的版本设置为3.1。Tomcat拒绝接受，所以我在web.xml中进行了servlet映射，不幸的是，这个解决方案不起作用。我以前试过，现在又试了一次。我也修改了映射URL，但仍然出现404错误。我没有得到日志条目。请检查ajax在浏览器控制台中请求的URL。尝试在浏览器中点击相同的URL以查找可能的错误日志