解决okhttp3提示java.lang.IllegalStateException:closed异常问题
作者：一缕纯氧
使用OkHttp3时,response.body().string()只能调用一次,重复调用会导致流关闭异常,解决方法是保存响应体内容到变量或重新构建Response对象,避免多次读取
okhttp3提示java.lang.IllegalStateException:closed异常
使用okhttp3的response.body().string()时候提示java.lang.IllegalStateException: closed异常
原因为okhttp3请求回调中response.body().string()只能有效调用一次，而我使用了两次，所以在第二次时调用时提示已关闭流的异常。
Response response = httpClient.newCall(request).execute();
logger.info(response.body().string()); //一次
Map<String,Object> resMap=objectMapper.readValue(response.body().string(),Map.class); //两次
解决办法
将返回的值保存在对象中，重复使用对象即可。(或者重新builder一个Response对象)
public void pushOrder(RecordPushRequest pushRequest) throws Exception {
//TODO:构造builder
Request.Builder builder = new Request.Builder()
.url(URL)
.header("Content_Type", "application/json");
//TODO:构造请求体
RequestBody requestBody = RequestBody.create(MediaType.parse("application/json"),
objectMapper.writeValueAsString(pushRequest));
//TODO:构造请求
Request request = builder.post(requestBody).build();
//TODO:发起请求
Response response = httpClient.newCall(request).execute();
String res = response.body().string();
// logger.info(response.body().string()); //打印时重复使用了一次
Map<String,Object> resMap=objectMapper.readValue(res,Map.class);
logger.info("得到的响应解析结果：{} ",resMap);
}
深扒response.body().string()问题原因
查看源码Response.class：
private final ResponseBody body;
发现body是一个ResponseBody 对象。继续查看ResponseBody 类的源码：
public abstract class ResponseBody implements Closeable
ResponseBody类实现Closeable接口，感觉有点找到问题的源泉了，继续点进去看看Closeable接口是干嘛的：
public interface Closeable extends AutoCloseable {
/**
* Closes this stream and releases any system resources associated
* with it. If the stream is already closed then invoking this
* method has no effect.
*
* <p> As noted in {@link AutoCloseable#close()}, cases where the
* close may fail require careful attention. It is strongly advised
* to relinquish the underlying resources and to internally
* <em>mark</em> the {@code Closeable} as closed, prior to throwing
* the {@code IOException}.
*
* @throws IOException if an I/O error occurs
*/
public void close() throws IOException;
}
Closeable接口继承AutoCloseable类，有一个close方法，官方标注：“关闭此流并释放与之关联的任何系统资源。
如果流已关闭，则调用此方法无效。”大概就是这个原因了。所以不要多次调用response.body().string()；语句。
总结
以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。