Java 将curl请求转换为HttpURLConnection

我正在尝试实现一个客户机，首先登录，并做一些工作人员。 这是我的要求：

curl -v https://api.example.com/api-token-auth/ \
   -H "Accept: application/json" \
   -d "username=myusername&password=mypassword"

我想把它转换成java代码。以下是我尝试过的：

HttpURLConnection conn;
URL obj = new URL("https://api.example.com/api-token-auth/");
URL obj = new URL(quoteURL);
conn = (HttpURLConnection) obj.openConnection();
conn.setRequestMethod("POST");
conn.setDoOutput(true);
String userpass = "username=myusername" + "&" + "password=mypassword";
String basicAuth =  new String(Base64.getEncoder().encode(userpass.getBytes()));
conn.setRequestProperty("Authorization", basicAuth);
conn.setRequestProperty( "Accept", "*/*" );
conn.setRequestProperty( "Accept-Encoding", "gzip, deflate" );
conn.setRequestProperty( "Accept-Language", "en;q=1, fr;q=0.9, de;q=0.8,ja;q=0.7, nl;q=0.6, it;q=0.5" );
conn.setRequestProperty( "Content-Type", "application/x-www-form-urlencoded; charset=utf-8" );
conn.setRequestProperty( "API-Version", "1.3.0" );
conn.setRequestProperty("Connection", "keep-alive");
conn.setRequestProperty( "Accept", "*/*" );
conn.setRequestProperty("User-Agent", "Mozilla/5.0");
conn.connect();
InputStreamReader inputStreamReader = new InputStreamReader(conn.getInputStream());
BufferedReader in = new BufferedReader(inputStreamReader);
String inputLine;
StringBuffer response = new StringBuffer();

while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
conn.disconnect();
return response;

然后我收到这个错误：

Exception in thread "main" java.io.IOException: Server returned HTTP response code: 400 for URL: https://api.example.com/api-token-auth/
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1839)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1440)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)

---

我试过几种可能的解决办法，但没有成功。我找不到我做错了什么

您的curl请求实际上并没有执行HTTP basicAuth（您的示例代码正试图执行此操作）-它只是将

-d

参数发布到服务器（作为url编码的主体）

所以

去掉所有setRequestProperty（）内容（不需要）

使用con.setContentType（“application/x-www-form-urlencoded”）[可以说这有点干净]

将userpass字符串写入con.getOutputStream（）[无需base64编码…同样，这与http basicAuth无关]

例如，curl命令发出以下HTTP请求

POST /api-token-auth/ HTTP/1.1
Host: api.example.com
User-Agent: curl/7.49.1
Accept: application/json
Content-Length: 39
Content-Type: application/x-www-form-urlencoded

username=myusername&password=mypassword

下面的Java程序将执行几乎完全相同的请求

public class SO {
public static void main(String[] args) throws Exception {
    String rsp = curl("http://axrsgpar0019:13080/api-token-auth/", "application/json", "username=myusername&password=mypassword");
}
public static String curl(String url, String accepts, String minusD) throws Exception {
    HttpURLConnection con = (HttpURLConnection)new URL(url).openConnection();
    con.setDoOutput(true);
    con.setRequestProperty("Accept", accepts);
    con.setRequestProperty("Content-Type",  "application/x-www-form-urlencoded");
    con.getOutputStream().write(minusD.getBytes());
    con.getOutputStream().close();

    ByteArrayOutputStream rspBuff = new ByteArrayOutputStream();
    InputStream rspStream = con.getInputStream();

    int c;
    while ((c = rspStream.read()) > 0) {
        rspBuff.write(c);
    }
    rspStream.close();

    return new String(rspBuff.toByteArray());
}
}

生成以下HTTP请求（唯一的区别是User Agent和keep alive..，这应该是无关紧要的）

---

您的curl请求实际上并没有执行httpbasicauth（您的示例代码正试图执行此操作）——它只是将

-d

参数发布到服务器（作为url编码的主体）

所以

去掉所有setRequestProperty（）内容（不需要）

使用con.setContentType（“application/x-www-form-urlencoded”）[可以说这有点干净]

将userpass字符串写入con.getOutputStream（）[无需base64编码…同样，这与http basicAuth无关]

例如，curl命令发出以下HTTP请求

POST /api-token-auth/ HTTP/1.1
Host: api.example.com
User-Agent: curl/7.49.1
Accept: application/json
Content-Length: 39
Content-Type: application/x-www-form-urlencoded

username=myusername&password=mypassword

下面的Java程序将执行几乎完全相同的请求

public class SO {
public static void main(String[] args) throws Exception {
    String rsp = curl("http://axrsgpar0019:13080/api-token-auth/", "application/json", "username=myusername&password=mypassword");
}
public static String curl(String url, String accepts, String minusD) throws Exception {
    HttpURLConnection con = (HttpURLConnection)new URL(url).openConnection();
    con.setDoOutput(true);
    con.setRequestProperty("Accept", accepts);
    con.setRequestProperty("Content-Type",  "application/x-www-form-urlencoded");
    con.getOutputStream().write(minusD.getBytes());
    con.getOutputStream().close();

    ByteArrayOutputStream rspBuff = new ByteArrayOutputStream();
    InputStream rspStream = con.getInputStream();

    int c;
    while ((c = rspStream.read()) > 0) {
        rspBuff.write(c);
    }
    rspStream.close();

    return new String(rspBuff.toByteArray());
}
}

生成以下HTTP请求（唯一的区别是User Agent和keep alive..，这应该是无关紧要的）

---

哦..哎哟-如果Accept:application/json很重要，那么您必须设置headerThanks请求响应的requestproperty（“Accept”，“app/json”），不幸的是，这不起作用。当我提交上面的curl请求时，我收到一个json格式的响应，如{“token”：“23424324”}。这应该很简单，但不起作用。这部分{-d“username=myusername&password=mypassword”}有“&”和“=”符号。是关于那件事吗。我还尝试了“：”而不是“&”和“：”。我用一个完整的示例更新了我的响应-curl命令的-d参数是正确的www-form-urlencoded（同样，curl本身只是将-d参数作为HTTP请求的主体传入）哦..哇哦-如果Accept:application/json很重要，那么您必须设置requestproperty（“Accept”，“app/json”）标题感谢响应，不幸的是，这不起作用。当我提交上述curl请求时，我收到一个json格式的响应，如{“token”：“23424324”}。这应该很简单，但不起作用。这部分{-d“username=myusername&password=mypassword”}有“&”和=“标志。是关于那件事吗。我还尝试了“：”而不是“&”和“：”。我用一个完整的示例更新了我的响应-curl命令的-d参数是正确的www-form-urlencoded（同样，curl本身只是将-d参数作为HTTP请求的主体传入）