JAVA+Struts2获取服务器地址的方法

要获取服务器地址，有几种情况可以考虑：

获取请求的完整URL

Struts2可以通过HttpServletRequest的getRequestURL方法获取当前请求URL，包括协议，主机名，端口和路径。在Action类中可以这样获取：

import javax.servlet.http.HttpServletRequest;
import com.opensymphony.xwork2.ActionSupport;

public class DemoAction extends ActionSupport {
    private HttpServletRequest request;

    public void setServletRequest(HttpServletRequest request) {
        this.request = request;
    }

    public String execute() throws Exception {
        StringBuffer url = request.getRequestURL();
        System.out.println("URL: " + url.toString());
        return SUCCESS;
    }
}

获取服务器的主机名和端口号

如果只需要获取服务器的主机名和端口号，可以使用HttpServletRequest的getServerName和getServerPort方法。在Action类中可以这样获取：

import javax.servlet.http.HttpServletRequest;
import com.opensymphony.xwork2.ActionSupport;

public class DemoAction extends ActionSupport {
    private HttpServletRequest request;

    public void setServletRequest(HttpServletRequest request) {
        this.request = request;
    }

    public String execute() throws Exception {
        String serverName = request.getServerName();
        int serverPort = request.getServerPort();
        System.out.println("Server name: " + serverName + ", port: " + serverPort);
        return SUCCESS;
    }
}

示例1：

URL: http://localhost:8080/myapp/index.jsp

输出：

URL: http://localhost:8080/myapp/index.jsp

示例2：

假设本地服务器的IP地址是192.168.1.100，端口是8888，部署的应用程序名称是myapp，那么URL应该是：

http://192.168.1.100:8888/myapp/index.jsp

输出：

URL: http://192.168.1.100:8888/myapp/index.jsp
Server name: 192.168.1.100, port: 8888