java.io.IOException: Attempted read from closed stream.
at org.apache.http.impl.io.ChunkedInputStream.read(ChunkedInputStream.java:162)
at org.apache.http.conn.EofSensorInputStream.read(EofSensorInputStream.java:137)
at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:264)
at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:306)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:158)
at java.io.InputStreamReader.read(InputStreamReader.java:167)
at java.io.Reader.read(Reader.java:123)
at org.apache.http.util.EntityUtils.toString(EntityUtils.java:244)
at org.apache.http.util.EntityUtils.toString(EntityUtils.java:288)
终于找到报错的原因：
EntityUtils.toString(entity)
这是由于EntityUtils.toString(entity)方法只能调用一次，entity所得到的流是不可重复读取的也就是说所得的到实体只能一次消耗完,不能多次读取。