我正在尝试从 java 向现有的 RESTful 服务发出 POST 请求，以便获取 json 响应并将其存储在字符串中。
假设 RESTful 服务 URL 如下:
https://myStore.com/REST-API/
这是一种有产品的商店，您想要搜索商品。为了进行搜索，您还必须发送请求正文，如下所示:
{
"searchProduct": "Football"
}
为了发表这篇文章，我在 java 中实现了以下方法:
public String getJsonResponse(String searchProduct) throws Exception {
String url = "https://myStore.com/REST-API/";
String requestBody = "{\"searchProduct\": \"" + searchProduct + "\"}";
URL obj = new URL(url);
HttpsURLConnection connection = (HttpsURLConnection) obj
.openConnection();
connection.setDoOutput(true);
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type", "application/json");
OutputStream outputStream = connection.getOutputStream(); // <-- I get an exception.
outputStream.write(requestBody.getBytes());
outputStream.flush();
BufferedReader in = new BufferedReader(new InputStreamReader(
connection.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
return response.toString();
}
异常(exception)情况如下:
Exception in thread "main" java.net.UnknownHostException: myStore.com
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:668)
at sun.security.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:173)
at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:264)
at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:367)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1105)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:999)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177)
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1283)
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1258)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getOutputStream(HttpsURLConnectionImpl.java:250)
at com.stavros.restfulServices.Requester.getJsonRespondingResults(Requester.java:70)
at com.stavros.restfulServices.MyMain.main(MyMain.java:11)
我不知道为什么会遇到这个异常，但如果您有想法或者也遇到了同样的问题，如果您发布建议或答案，我将不胜感激。
最佳答案
我尝试运行您的代码并收到此错误
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head><title>301 Moved Permanently</title></head>
<body><h1>Moved Permanently</h1>
<p>The document has moved <a href="http://www.myStore.com/REST-API/">here</a>.</p>
<hr><address>Apache/2.4.7 (Ubuntu) Server at mystore.com Port 80</address></body></html>
意味着您需要重新验证 Web 服务的 URL，可能它已移动到其他主机。 https://en.wikipedia.org/wiki/HTTP_301
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
try {
System.out.println(getJsonResponse("Football"));
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static String getJsonResponse(String searchProduct) throws Exception {
String url = "https://myStore.com/REST-API/";
String requestBody = "{\"searchProduct\": \"" + searchProduct + "\"}";
URL obj = new URL(url);
HttpsURLConnection connection = (HttpsURLConnection) obj
.openConnection();
connection.setDoOutput(true);
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type", "application/json");
OutputStream outputStream = connection.getOutputStream(); // <-- I get an exception.
outputStream.write(requestBody.getBytes());
outputStream.flush();
BufferedReader in = new BufferedReader(new InputStreamReader(
connection.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
return response.toString();
}
}
关于java - 如何从 Java 向 json RESTful 服务发出 post 请求？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37182884/