Exception in thread "main" java.net.SocketTimeoutException: connect timed ou错误处理

最新推荐文章于 2025-06-01 22:13:39 发布

你狗

最新推荐文章于 2025-06-01 22:13:39 发布

阅读量2.6k

点赞数 1

CC 4.0 BY-SA版权

文章标签： java

原文链接：http://www.cnblogs.com/yuanqin/p/4341030.html

本文介绍了使用Jsoup进行网页解析时遇到的读取超时异常及其解决方案。通过设置合理的超时时间，可以有效避免此类异常的发生。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

今天做了一个Jsoup解析网站的项目，使用Jsoup.connect(url).get()连接某网站时偶尔会出现
java.net.SocketTimeoutException:Read timed out异常。
原因是默认的Socket的延时比较短，而有些网站的响应速度比较慢，
所以会发生超时的情况。

解决方法：

链接的时候设定超时时间即可。
doc = Jsoup.connect(url).timeout(5000).get();
5000表示延时时间设置为5s。

测试代码如下：
1，不设定timeout时：

package jsoupTest;
import java.io.IOException;
import org.jsoup.*;
import org.jsoup.helper.Validate;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
public class JsoupTest {
public static void main(String[] args) throws IOException{
String url = "http://www.jb51.net";
long start = System.currentTimeMillis();
Document doc=null;
try{
doc = Jsoup.connect(url).get();
}
catch(Exception e){
e.printStackTrace();
}
finally{
System.out.println("Time is:"+(System.currentTimeMillis()-start) + "ms");
}
Elements elem = doc.getElementsByTag("Title");
System.out.println("Title is:" +elem.text());
}
}

有时发生超时：
java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at java.io.BufferedInputStream.fill(Unknown Source)
at java.io.BufferedInputStream.read1(Unknown Source)
at java.io.BufferedInputStream.read(Unknown Source)
at sun.net.www.http.ChunkedInputStream.fastRead(Unknown Source)
at sun.net.www.http.ChunkedInputStream.read(Unknown Source)
at java.io.FilterInputStream.read(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(Unknown Source)
at java.util.zip.InflaterInputStream.fill(Unknown Source)
at java.util.zip.InflaterInputStream.read(Unknown Source)
at java.util.zip.GZIPInputStream.read(Unknown Source)
at java.io.BufferedInputStream.read1(Unknown Source)
at java.io.BufferedInputStream.read(Unknown Source)
at java.io.FilterInputStream.read(Unknown Source)
at org.jsoup.helper.DataUtil.readToByteBuffer(DataUtil.java:113)
at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:447)
at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:393)
at org.jsoup.helper.HttpConnection.execute(HttpConnection.java:159)
at org.jsoup.helper.HttpConnection.get(HttpConnection.java:148)
at jsoupTest.JsoupTest.main(JsoupTest.java:17)
Time is:3885ms
Exception in thread "main" java.lang.NullPointerException
at jsoupTest.JsoupTest.main(JsoupTest.java:25)

2 设定了则一般不会超时

package jsoupTest;
import java.io.IOException;
import org.jsoup.*;
import org.jsoup.helper.Validate;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
public class JsoupTest {
public static void main(String[] args) throws IOException{
String url = "http://www.jb51.net";
long start = System.currentTimeMillis();
Document doc=null;
try{
doc = Jsoup.connect(url).timeout(5000).get();
}
catch(Exception e){
e.printStackTrace();
}
finally{
System.out.println("Time is:"+(System.currentTimeMillis()-start) + "ms");
}
Elements elem = doc.getElementsByTag("Title");
System.out.println("Title is:" +elem.text());
}
}