Java WEB 多個servlet的web.xml配置

本文轉載自查看原文 2013-12-16 01:03 18588 Java WEB

先貼上三個servlet java類 :

package mypack;

import java.io.IOException;

import javax.servlet.GenericServlet;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class DispatchServlet
 */
public class DispatchServlet extends GenericServlet {
    private static final long serialVersionUID = 1L;
    private String target="/hello.jsp";
    @Override
    public void service(ServletRequest request, ServletResponse response)
            throws ServletException, IOException {
        // TODO Auto-generated method stub
        String username=request.getParameter("username");
        String password=request.getParameter("password");
        
        request.setAttribute("USER", username);
        request.setAttribute("PASSWORD", password);
        
        ServletContext context=getServletContext();
        RequestDispatcher dispatcher=context.getRequestDispatcher(target);
        dispatcher.forward(request, response);
    }
      
    
   
}

上面這個類在java web第一篇文章中出現了.

package mypack;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class HelloWorld extends HttpServlet {
    
     private String message;

      public void init() throws ServletException
      {
          // Do required initialization
          message = "Hello World";
      }

      
      public void doGet(HttpServletRequest request,
                        HttpServletResponse response)
                throws ServletException, IOException
      {
          // Set response content type
          response.setContentType("text/html");

          // Actual logic goes here.
          PrintWriter out = response.getWriter();
          out.println("<h1>" + message + "</h1>");
      }
      
      public void destroy()
      {
          // do nothing.
      }

}

package mypack;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ResInfoServlet extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        // TODO Auto-generated method stub
        
        
        response.setContentType("text/html;charset=GB2312");
        
        PrintWriter out=response.getWriter();
        out.println("<html><head><title>ResInfoServlet</title></head>");
        out.println("<body>");
        out.println("<br>LocalAddr : " + request.getLocalAddr());
        out.println("<br>LocalName : " + request.getLocalName());
        
        out.println("<br>username : "+request.getParameter("username"));
        out.println("</body></html>");
        
        out.close();
        
    }


}

web.xml文件中配置如下:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>helloapp</display-name>
  <welcome-file-list>
    <welcome-file>login.html</welcome-file>
  </welcome-file-list>
  <servlet>
    <description></description>
    <display-name>DispatchServlet</display-name>
    <servlet-name>DispatchServlet</servlet-name>
    <servlet-class>mypack.DispatchServlet</servlet-class>
  </servlet>
  
  <servlet-mapping>
    <servlet-name>DispatchServlet</servlet-name>
    <url-pattern>/DispatchServlet</url-pattern>
  </servlet-mapping>
  
  <servlet>
    <description></description>
    <display-name>ResInfoServlet</display-name>
    <servlet-name>ResInfoServlet</servlet-name>
    <servlet-class>mypack.ResInfoServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>ResInfoServlet</servlet-name>
    <url-pattern>/ResInfoServlet</url-pattern>
  </servlet-mapping>
  
  <servlet>
        <servlet-name>HelloWorld</servlet-name>
        <servlet-class>mypack.HelloWorld</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>HelloWorld</servlet-name>
        <url-pattern>/HelloWorld</url-pattern>
    </servlet-mapping>
    
  
</web-app>

在瀏覽器中輸入:

http://localhost:8080/helloapp/info?username=TOM

http://localhost:8080/helloapp/HelloWorld

需要注意幾個細節:

<1> : extends HttpServlet 需要注意:重寫doGet等方法時,需要全部去掉super.doGet(~~~)之類的,這在上一篇文中解釋.

<2> : <url-pattern>/info</url-pattern> : http://localhost:8080/helloapp/info?username=TOM 隱蔽了真實的名.

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