错误404:使用HelloWorld Servlet不能使用请求的资源 [英] Error 404: The requested resource is not available using HelloWorld servlet

问题描述

我正在编写Java Servlet，但我正在努力获取一个简单的 HelloWorld 示例以使其正常工作.

I am writing a Java Servlet, and I am struggling to get a simple HelloWorld example to work properly.

HelloWorld.java 类为:

package crunch;

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

public class HelloWorld extends HttpServlet {
  public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
      throws ServletException, IOException {
    PrintWriter out = response.getWriter();
    out.println("Hello World");
  }
}

我正在运行Tomcat v7.0，并且已经阅读了类似的问题，答复涉及更改 web.xml中的 invoker servlet-mapping 部分.该部分实际上在我的系统中不存在，当我添加它时，仍然会出现相同的问题.

I am running Tomcat v7.0, and have already read similar questions, with responses referring to changing the invoker servlet-mapping section in web.xml. This section actually doesn't exist in mine, and when I added it the same problem still occurred.

推荐答案

尝试一下(如果使用Java EE V6)

Try this (if the Java EE V6)

package crunch;

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

@WebServlet(name="hello",urlPatterns={"/hello"}) // added this line

public class HelloWorld extends HttpServlet {
  public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
      throws ServletException, IOException {
    PrintWriter out = response.getWriter();
    out.println("Hello World");
  }
}

现在通过 http://127.0.0.1:8080/yourapp/hello

其中8080​​是默认的Tomcat端口，而 yourapp 是您的应用的上下文名称

where 8080 is default Tomcat port, and yourapp is the context name of your applciation

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