java定时器的问题，程序隔一段时间发送一次HTTP请求，但是....

[liuxiaohui1987]

做了一个定时器，就是每个一段时间去发送一个HTTP请求，程序：

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Timer;
import java.util.TimerTask;

public class HttpTimerTest {

    public static void sendHttp(String urlStr) {
        System.out.println("sendHttp");
        try {
            URL url = new URL(urlStr);
            HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection(); 
            httpURLConnection.setRequestMethod("GET"); 
            httpURLConnection.setDoOutput(true);

            int size = httpURLConnection.getContentLength();
            byte[] buffer = new byte[size]; 
            byte[] in_b = new byte[size]; 
            int count = 0;
            int rbyte = 0;
            System.out.println("size=" + size);
            InputStream is = httpURLConnection.getInputStream();
            while (count < size) { // 循环读取
                rbyte = is.read(buffer); 
                for (int i = 0; i < rbyte; i++) {
                    in_b[count + i] = buffer[i];
                }
                count += rbyte;
            }
            String content = new String(buffer, "UTF-8");
            System.out.println(content);
            is.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    public static void main(String args[]) {
        Timer timer = new Timer();
        boolean i = true;
        timer.schedule(new URLTask(), 1000, 5000);
        while (i) {
            System.out.println(i);
            try {
                int ch = System.in.read();
                if (ch - 'c' == 0) {
                    i = false;
                    timer.cancel();//使用这个方法退出任务
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    static class URLTask extends TimerTask {

        public void run() {
            long start = System.currentTimeMillis();
            sendHttp("http://localhost:8888/1/1.txt");
            //System.out.println("________");
            long end = System.currentTimeMillis();
            long time = end - start;
            System.out.println(time / 1000 + "秒" + time % 1000 + "毫秒");
        }
    }
}

任务就是执行sendHttp(..),可是执行的时候好像就死在了sendHttp（）里面了，应该是每隔5秒打印一次返回的内容，可是没打印，当退出的时候才打印一次，跟踪发现就到了sendHttp()就不走了。
但是我要是注释掉sendHttp，任务是只打印“-------”，正常，每隔5秒打印一次。
不知道为什么，高手来指点一下。
不胜感激，谢谢

[liuxiaohui1987]

自己顶一个。

[liuxiaohui1987]

int size = httpURLConnection.getContentLength();

就走到这一句就不打印了，知道退出后才打印
是不是跟线程有关？
来指点一下。

[marf_cn]

InputStream is = httpURLConnection.getInputStream();
while (count < size) { // 循环读取
rbyte = is.read(buffer);
这里出了问题，程序要求手动输入内容，输入后有了打印

[marf_cn]

用这个函数替换你的sendhttp,导入commons-httpclient包

 public static String httpGet(String url) {
        String result = null;
        HttpClient httpClient = new HttpClient();
        GetMethod getMethod = new GetMethod(url);
        getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,
                new DefaultHttpMethodRetryHandler());
        try {
            int statusCode = httpClient.executeMethod(getMethod);// 执行getMethod
            System.out.println("status: "+statusCode);
            if (statusCode != HttpStatus.SC_OK) {
                System.out.println(getMethod.getStatusLine());
            }
            result = getMethod.getResponseBodyAsString();
            System.out.println("url: "+url);
            System.out.println("result: "+result);
//          System.out.println("result: "+new String(result,"utf-8"));
        } catch (HttpException e) {
            System.out.println(e.getMessage());
        } catch (IOException e) {
            System.out.println(e.getCause());
        } finally {
            getMethod.releaseConnection(); // 释放连接
        }
        return new String(result).trim();
    }

[marf_cn]

int ch = System.in.read(); 你这里为什么要设置手动输入呢？

[liuxiaohui1987]

[Quote=引用 3 楼 marf_cn 的回复:]
InputStream is = httpURLConnection.getInputStream();
while (count < size) { // 循环读取
rbyte = is.read(buffer);
这里出了问题，程序要求手动输入内容，输入后有了打印
[/Quote]
那每隔5秒sendHttp()都执行一次吗？
为什么我发现到了
int size = httpURLConnection.getContentLength();
就不走了呢？

[liuxiaohui1987]

[Quote=引用 5 楼 marf_cn 的回复:]
int ch = System.in.read(); 你这里为什么要设置手动输入呢？
[/Quote]
那我怎么让他什么时候停就什么时候听呢？

[liuxiaohui1987]

自己顶啊！