Apache HttpClient in Java, instream.toString = org.apache.http.conn.EofSensorInputStream

Question

我正在获取一个带有 Apache HttpClient 的页面，我想将服务器回复的 http 正文存储到一个字符串中，这样我就可以操作这个字符串并将其打印到控制台。

不幸的是，在运行此方法时，我收到此消息：

17:52:01,862  INFO Driver:53 - fetchPage STARTING
17:52:07,580  INFO Driver:73 - fetchPage ENDING, took 5716
org.apache.http.conn.EofSensorInputStream@5e0eb724

fetchPage Class：

public String fetchPage(String part){
    log.info("fetchPage STARTING");
    long start = System.currentTimeMillis();

    String reply;

    String searchurl = URL + URL_SEARCH_BASE + part + URL_SEARCH_TAIL;

    HttpClient httpclient = new DefaultHttpClient();
    HttpGet httpget = new HttpGet(searchurl);
    HttpResponse response;
    try {
        response = httpclient.execute(httpget);
        HttpEntity entity = response.getEntity();
        if (entity != null) {
            InputStream instream = entity.getContent();
            int l;
            byte[] tmp = new byte[2048];
            while ((l = instream.read(tmp)) != -1) {
            }
            long elapsedTimeMillis = System.currentTimeMillis()-start;
            log.info("fetchPage ENDING, took " + elapsedTimeMillis);
            reply = instream.toString();
            System.out.println(reply);
            return reply;
        }
    } catch (ClientProtocolException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    return null;
}

Answer 1

您在InputStream上调用toString在它已经读完之后。 您需要从字节 arrays 创建字符串。 获取内容的字符串版本的更简单方法是使用EntityUtils.toString(HttpEntity)

确切的实现如下所示：

import org.apache.http.util.EntityUtils;

public String fetchPage(String part){
    log.info("fetchPage STARTING");
    long start = System.currentTimeMillis();

    String reply;

    String searchurl = URL + URL_SEARCH_BASE + part + URL_SEARCH_TAIL;

    HttpClient httpclient = new DefaultHttpClient();
    HttpGet httpget = new HttpGet(searchurl);
    HttpResponse response;
    try {
        response = httpclient.execute(httpget);
        HttpEntity entity = response.getEntity();
        if (entity != null) {
            return EntityUtils.toString(entity);
        }
    } catch (ClientProtocolException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    return null;
}