[英]Unable to get JSON response from URLConnection
我正在尝试使用Java URLConnection从googleapi中读取响应。
在浏览器中,如果我查询“ https://www.googleapis.com/pagespeedonline/v2/runPagespeed?url=https%3A%2F%2Fwww.zauq.se&strategy=mobilez ”
我在JSON格式中获得响应。
{
"error": {
"errors": [
{
"domain": "global",
"reason": "invalidParameter",
"message": "Invalid string value: 'mobilez'. Allowed values: [desktop, mobile]",
"locationType": "parameter",
"location": "strategy"
}
],
"code": 400,
"message": "Invalid string value: 'mobilez'. Allowed values: [desktop, mobile]"
}
}
但是当我使用以下代码时。
URL url = null;
System.setProperty("http.agent", "");
url = new URL("https://www.googleapis.com/pagespeedonline/v2/runPagespeed?url=https%3A%2F%2Fwww.zauq.se&strategy=mobilez");//"https://www.googleapis.com/pagespeedonline/v2/runPagespeed?url=" + paramUrl + "&strategy=" + paramStrategy);
URLConnection conn = url.openConnection();
conn.setRequestProperty("Accept", "application/json");
conn.setRequestProperty("User-Agent", "Mozilla/5.0");
BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String strTemp = "";
StringBuilder sb = new StringBuilder();
while ((null != (strTemp = br.readLine())))
{
sb.append(strTemp);
if (dump)
{
System.out.println(strTemp);
}
}
我得到IO异常
java.io.IOException: Server returned HTTP response code: 400 for URL: https://www.googleapis.com/pagespeedonline/v2/runPagespeed?url=https%3A%2F%2Fwww.zauq.se&strategy=mobilez
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1627)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)
at amirTest.PageSpeedCheck.main(PageSpeedCheck.java:62)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
/,但我需要获取JSON响应。
请建议我进行更改以获取JSON作为响应。
将连接强制转换为Http(s)URLConnection,并在发生错误的情况下调用getErrorStream()以获取流。
API调用中使用的参数错误,因此服务器正在重新调整状态码400。这意味着它是BAD请求。
mobilz应该是可移动的。 另外,您使用的网址不正确。
您只需要更改代码,如下所示:
BufferedReader reader = new BufferedReader(new InputStreamReader(((HttpURLConnection) (new URL("https://www.googleapis.com/pagespeedonline/v2/runPagespeed?url=https%3A%2F%2Fwww.zauq.se&strategy=mobilez")).openConnection())
.getInputStream(), Charset.forName("UTF-8")));
在这里查看原始答案
看到类似的SO问题,如下所示:
谢谢@ JB Nizet
它在我尝试读取Error Stream时起作用。
InputStream is = null;
if (conn.getResponseCode() == 400)
{
is = conn.getErrorStream();
error = true;
} else
{
is = conn.getInputStream();
}
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