如何访问URL并从java servlet获取响应？ [英] How to access a url and get its response from java servlet?

问题描述

我是servlet编程的新手，我的任务是编写一个srvlet程序，它将访问一个url并检索其内容.pls do help

I am new to servlet programming my task is to write a srvlet program that will access a url and retrieve its contents .pls do help

推荐答案

你需要做这样的事情

import java.io.*;
import java.net.URL;
import java.net.URLConnection;

import javax.servlet.http.*;
import javax.servlet.*;


public class URLServlet extends HttpServlet {
    public void doGet(HttpServletRequest req, HttpServletResponse res)
            throws ServletException, IOException {

        URL urldemo = new URL("http://www.demo.com/");
        URLConnection yc = urldemo.openConnection();
        BufferedReader in = new BufferedReader(new InputStreamReader(
                yc.getInputStream()));
        String inputLine;
        while ((inputLine = in.readLine()) != null)
            System.out.println(inputLine);
        in.close();

    }
}

普通java程序

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;

public class URLServlet {

    public static void main(String s[]) {
        try {
        URL urldemo = new URL("http://www.google.com/");
        URLConnection yc = urldemo.openConnection();
        BufferedReader in = new BufferedReader(new InputStreamReader(
                yc.getInputStream()));
        String inputLine;
        while ((inputLine = in.readLine()) != null)
            System.out.println(inputLine);
        in.close();
        }catch(Exception e) {
            System.out.println(e);
        }
    }
}

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