同一服务器中两个Web应用程序之间的通信

问题描述：

全部，

我在tomcat服务器上部署了2个Web应用程序，Web1和Web2。我希望Web1中的类在Web2中调用类的方法。一种方法是使用webservice。有没有其他方法类似于在同一个Web应用程序上调用类的方法？。

I have 2 web applications, Web1 and Web2, deployed on my tomcat server. I want classes in Web1 to call methods on classes in Web2. One way to do this is using webservice. Is there any other way similar to calling a method on class on same web application ?.

谢谢。

答

是的。有可能的。它使用
getServletContext（）。getContext（）方法尝试使用相同的servlet容器。

Yes. It is possible. It tried for same servlet container by using getServletContext().getContext() method.

首先需要进行更改下面的文件

First you need to make changes in below file

（Windows）C：\Program Files\Apache Software Foundation \Tomcat 7.0 \\\\,,, $ $ $ $ $
设定值crossContext为true。

(Windows) C:\Program Files\Apache Software Foundation\Tomcat 7.0\conf\context.xml Set value of crossContext to true.

context.xml

<Context crossContext="true">

    <!-- Default set of monitored resources -->
    <WatchedResource>WEB-INF/web.xml</WatchedResource>

    <!-- Uncomment this to disable session persistence across Tomcat restarts -->
    <!--
    <Manager pathname="" />
    -->

    <!-- Uncomment this to enable Comet connection tacking (provides events
         on session expiration as well as webapp lifecycle) -->
    <!--
    <Valve className="org.apache.catalina.valves.CometConnectionManagerValve" />
    -->

</Context>

请注意 crossContext =true。

假设您有两个名为 InterServletComm1 的Web应用程序和 InterServletComm2
，其中包含servlet Servlet1 和分别在每个Web应用程序中使用 Servlet1 。然后每个servlet中的代码如下：

Suppose you have two web applications with name InterServletComm1 and InterServletComm2 having servlets Servlet1 and Servlet1 in each web application respectively. Then the code in each servlets goes as follows:

Servlet1.java

package interServletComm1;

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

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class Servlet1
 */
@WebServlet("/Servlet1")
public class Servlet1 extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public Servlet1() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
    {
        response.setContentType("text/html");
        PrintWriter pw = response.getWriter();

        request.setAttribute("name", "WebApp1");
        ServletContext context = getServletContext().getContext("/InterServletComm2");
        RequestDispatcher rd = context.getRequestDispatcher("/Servlet2");
        rd.forward(request, response);
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
    }

}

Servlet2.java

package interServletComm2;

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

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class Servlet2
 */
@WebServlet("/Servlet2")
public class Servlet2 extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public Servlet2() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
    {
        response.setContentType("text/html");
        PrintWriter pw = response.getWriter();
        String name = (String) request.getAttribute("name");
        pw.println("This is web application 2.");
        pw.println("<br>The value received from web application one is: " + name);
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
    }

}

上面的代码从 InterServletComm1 发送属性 name ，它在 InterServletComm2 中收到。
如果答案不明确，请与我们联系。

Above code sends attribute name from InterServletComm1 and it is received in InterServletComm2. Please let me know if this answer is not clear.

同一服务器中两个Web应用程序之间的通信

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