问题背景

使用HttpClient的时候报错java.io.IOException: Attempted read from closed stream

2022-01-21 14:48:30.627 ERROR 32956 --- [           main] c.dz.marketservice.util.HttpClientPool   : =============["异常"]======================, e: {}

java.io.IOException: Attempted read from closed stream.
	at org.apache.http.impl.io.ContentLengthInputStream.read(ContentLengthInputStream.java:165) ~[httpcore-4.4.15.jar:4.4.15]
	at org.apache.http.conn.EofSensorInputStream.read(EofSensorInputStream.java:135) ~[httpclient-4.5.13.jar:4.5.13]
	at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:284) ~[na:1.8.0_221]
	at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:326) ~[na:1.8.0_221]
	at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178) ~[na:1.8.0_221]
	at java.io.InputStreamReader.read(InputStreamReader.java:184) ~[na:1.8.0_221]
	at java.io.Reader.read(Reader.java:140) ~[na:1.8.0_221]
	at org.apache.http.util.EntityUtils.toString(EntityUtils.java:227) ~[httpcore-4.4.15.jar:4.4.15]
	at org.apache.http.util.EntityUtils.toString(EntityUtils.java:308) ~[httpcore-4.4.15.jar:4.4.15]
	at com.dz.marketservice.util.HttpClientPool.postForJsonObject(HttpClientPool.java:127) ~[classes/:na]
	at com.dz.marketservice.client.HttpTest.packageReq(HttpTest.java:63) [classes/:na]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_221]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_221]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_221]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_221]
	at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:725) [junit-platform-commons-1.8.2.jar:1.8.2]

java.lang.NullPointerException
	at com.dz.marketservice.client.HttpTest.packageReq(HttpTest.java:64)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:725)
	at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)

解决方案

1 看错误Attempted read from closed stream翻译过来就是：从已经关闭的流中尝试再次读取，根据这条报错，我去看了我的代码

System.out.println(EntityUtils.toString(response.getEntity()));
JSONObject result = JSONObject.parseObject(EntityUtils.toString(response.getEntity()));

2 为了方便我自己加入了一条打印，重复使用了response.getEntity()，但是这个获取只能获取一次，就像发布与消费，当中间的消息消费掉了，再去使用，找不到就报错了，所以这条语句可以改成：

String temp = EntityUtils.toString(response.getEntity());
System.out.println(temp);
JSONObject result = JSONObject.parseObject(temp));

心得

• 耐心读一下报错信息，好好理解一下，也能自己解决问题

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