POST请求的Java Servlet返回错误405（不允许使用方法）

Question

我的服务可以很好地处理get请求，但是当我调用POST（使用jquery ajax $ .post）时，出现错误405（不允许使用方法）

这是我的代码：

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class init extends HttpServlet {
    public init() { }
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/plain");
        PrintWriter out = response.getWriter();
        out.println("GET");
    }
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException, IllegalStateException {
        response.setContentType("application/json");
        ServletInputStream in = request.getInputStream();
        PrintWriter out = response.getWriter();
        out.print("POST");
    }
}

Answer 1

您确定确实覆盖了doPost方法吗？

签名如下所示：

protected void doPost(HttpServletRequest req, HttpServletResponse resp)
           throws ServletException, java.io.IOException

但您可以这样指定：

public void doPost(HttpServletRequest request, HttpServletResponse response) 
           throws ServletException, IOException, IllegalStateException

请尝试以下步骤：

1. 添加@Override注释
2. 删除抛出的IllegalStateException（这不是问题，因为它是运行时异常）