[英]How do I read HttpEntity without consuming it?
我有org.apache.http.HttpResponse
對象,該對象在代碼的不同位置使用。 這些地方之一是日志記錄。
問題是當我運行以下日志代碼時:
HttpEntity entity = response.getEntity();
try {
String content = Base64.encodeToString(
EntityUtils.toByteArray(entity), Base64.DEFAULT);
sb.append(content + "\r\n");
} catch (Exception e) {
sb.append("\r\n\r\n====EXCEPTION=====\r\n" + e.toString()
+ "\r\n");
}
然后,我嘗試讀取實際處理代碼中的條目內容,這導致代碼引發以下異常:
java.lang.IllegalStateException: Content has been consumed
我的問題是:如何讀取實體而不在日志代碼中使用它?
UPDATE這是我用來將httpresponse轉換為字符串的函數的完整代碼:
static String toString(org.apache.http.HttpResponse response) {
try {
if (response == null) {
return "null";
}
StringBuilder sb = new StringBuilder();
sb.append("==============BEGIN HttpResponse================\r\n");
StatusLine sl = response.getStatusLine();
if (sl == null) {
sb.append("status line is null\r\n");
} else {
sb.append(String.format("%s %s\r\n", sl.getStatusCode(),
sl.getReasonPhrase()));
}
for (Header h : response.getAllHeaders()) {
if (h == null) {
sb.append("header is null\r\n");
continue;
}
sb.append(String.format("%s: %s\r\n", h.getName(), h.getValue()));
}
sb.append("\r\r\r\n");
HttpEntity entity = response.getEntity();
if (entity == null) {
sb.append("content is null");
} else {
try {
String content = Base64.encodeToString(
EntityUtils.toByteArray(entity), Base64.DEFAULT);
sb.append(content + "\r\n");
} catch (Exception e) {
sb.append("\r\n\r\n====EXCEPTION=====\r\n" + e.toString()
+ "\r\n");
}
}
sb.append("\r\n==============END HttpResponse================\r\n");
return sb.toString();
} catch (Exception e) {
return e.toString();
}
}
好。 因此,我最終要做的是實現自己的HttpEntity類,而不僅僅是使用response.setEntity(...)
替換先前的實體。 該類將結果存儲為二進制數組,並根據需要返回多次。
它可能會給您帶來一些性能問題,但是會起作用:帶記錄功能的HttpClient示例。
private CloseableHttpResponse invoke(HttpRequestBase http) {
try {
CloseableHttpResponse response = client.execute(http);
if (http instanceof HttpPost) {
InputStream inputStream = ((HttpPost) http).getEntity().getContent();
String body = IOUtils.toString(inputStream, Charset.defaultCharset());
HttpEntity respBody = response.getEntity();
String responseBody = StreamUtils.copyToString(respBody.getContent(), Charset.defaultCharset());
response.setEntity(new StringEntity(responseBody));
LOG.info(String.format("Sending request: [%s] %s => [%s] \nPayload:\n%s \nResponse:\n%s", http.getMethod(), http.getURI(), response.getStatusLine(), body, responseBody));
} else {
LOG.info(String.format("Sending request: [%s] %s => [%s]", http.getMethod(), http.getURI(), response.getStatusLine()));
}
return response;
} catch (IOException e) {
throw new RuntimeException("HTTP request failed: " + http.toString(), e);
}
}
主要思想如下:
1.撥打http
2.復制到您的響應正文中:
HttpEntity respBody = response.getEntity();
String responseBody = StreamUtils.copyToString(respBody.getContent(), Charset.defaultCharset());
response.setEntity(new StringEntity(responseBody));
該示例適用於小型測試框架,不確定適用於生產應用程序的代碼
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