Java 模拟 HTTP Get Post 请求实现论坛自动回帖

Posted 2022-06-22 学习编程知识

设计思路

最近想自动发帖回帖，拿某论坛试验了一下，发现可行，不过后续没有再使用，免得影响论坛正常运行。

1. 帖子链接的格式为
   http://bbs.***.***.**/forum.php?mod=viewthread&tid=774210
   最后面774210数字变化, 就可以得到不同的帖子

2. 防止帖子发表会又被删了的情况, 进行判断帖子是否存在

3. 递增后面的 id 数字, 对每个链接做回帖的 POST 请求

重难点

回帖需要用户登录信息

• 一种是利用Cookie

• 另一种是进行模拟登录

本文采用前者

判断 url 对应的帖子是否存在

有可能用户发了帖子，比如 url 为 http://bbs.***.***.**/forum.php?mod=viewthread&tid=774200

后来该帖子用户删除了或者被管理员删除了，虽然帖子不在了，但是该 tid=774200 还是存在的

public static boolean isExist(int id) 
    String tmpPath = baseRefer + id;

    URL url;
    try 
        url = new URL(tmpPath);

        HttpURLConnection con = (HttpURLConnection) url.openConnection();
        con.addRequestProperty("Content-Type", "text/html; charset=UTF-8");
        con.addRequestProperty(
                "User-Agent",
                "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.104 Safari/537.36");
        con.addRequestProperty("Referer", "http://t.dianping.com/register");
        con.setRequestMethod("GET");

        if (con.getResponseCode() == 200) 
            InputStream inputStr = con.getInputStream();
            String info = new String(StreamTool.read(inputStr), "UTF-8");
            if (info.contains("抱歉，指定的主题不存在或已被删除或正在被审核")) 
                System.out.println("id=" + id + "帖子存在或已被删除！");
                return false;
            
        
     catch (MalformedURLException e) 
        // TODO Auto-generated catch block
        e.printStackTrace();
     catch (IOException e) 
        // TODO Auto-generated catch block
        e.printStackTrace();
     catch (Exception e) 
        // TODO Auto-generated catch block
        e.printStackTrace();
    
    return true;

模拟发帖

代码比较简单，注意事项是找到自己的Cookie，赋给String yourCookeie

用post发送一个回帖，回帖信息在 mapData.put("message", "友情帮顶了") 中

private static final String baseRefer = "http://bbs.**.**.**/forum.php?mod=viewthread&tid=";

private static final String yourCookeie = "Q8qA_2132_saltkey=**; Q8qA_2132_lastvisit=****3699;";

public static void main(String[] args) 
    int startId = 774210; // you need change

    for (int i = 0; i < 100; i++) 
        postMessage(startId);
        startId++;
    


public static void postMessage(int id) 
    if (!isExist(id)) 
        return;
    
    String tmpPath = baseRefer + id;

    StringBuilder path = new StringBuilder(tmpPath);
    Map<String, String> mapData = new LinkedHashMap<String, String>();
    mapData.put("mod", "post");
    mapData.put("action", "reply");
    mapData.put("replysubmit", "yes");
    mapData.put("infloat", "yes");
    mapData.put("handlekey", "fastpost");
    mapData.put("inajax", "1");
    mapData.put("message", "友情帮顶了");
    mapData.put("formhash", "86ec5d81");
    try 
        for (Map.Entry<String, String> mapEnt : mapData.entrySet()) 
            path.append("&");
            path.append(mapEnt.getKey() + "=");
            path.append(URLEncoder.encode(mapEnt.getValue(), "UTF-8"));
        

        URL url = new URL(path.toString());
        HttpURLConnection con = (HttpURLConnection) url.openConnection();
        con.setRequestMethod("POST");
        con.setRequestProperty("Content-Type",
                "application/x-www-form-urlencoded");
        con.setRequestProperty("Content-Length",
                String.valueOf(path.length()));
        con.setRequestProperty(
                "User-Agent",
                "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.104 Safari/537.36");
        con.setRequestProperty("Cookie", yourCookeie);
        con.setDoOutput(true);
        OutputStream outStr = con.getOutputStream();
        outStr.write(path.toString().getBytes());

        if (con.getResponseCode() == 200) 
            InputStream inputStr = con.getInputStream();
            String info = new String(StreamTool.read(inputStr), "UTF-8");
            System.out.println("在id=" + id + "成功发帖！");
            try 
                Thread.sleep(20 * 1000);
             catch (InterruptedException e) 
                // TODO Auto-generated catch block
                e.printStackTrace();
            
        

     catch (UnsupportedEncodingException e) 
        // TODO Auto-generated catch block
        e.printStackTrace();
     catch (MalformedURLException e) 
        // TODO Auto-generated catch block
        e.printStackTrace();
     catch (IOException e) 
        // TODO Auto-generated catch block
        e.printStackTrace();
     catch (Exception e) 
        // TODO Auto-generated catch block
        e.printStackTrace();
    

还有一个工具方法，将输入流转化为字节

class StreamTool 
    public static byte[] read(InputStream inputStr) throws Exception 
        ByteArrayOutputStream outStr = new ByteArrayOutputStream();
        // TODO Auto-generated method stub
        byte[] buffer = new byte[1024];
        int len = 0;
        while ((len = inputStr.read(buffer)) != -1) 
            outStr.write(buffer, 0, len);
        
        inputStr.close();
        return outStr.toByteArray();
    

效果图