如何通过在Java中添加查询参数来执行HTTP POST请求？

Question

这里我试图通过使用Java添加查询参数将一些数据发布到Rest API，但是得到响应说错误的请求。

当我从SOAPUI或CURL命令测试它时它工作正常。

package com.anergroup;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.impl.client.DefaultHttpClient;

public class RestRequestURL {
    public void TestRestRequest(){
        HttpClient httpclient = new DefaultHttpClient();
        URIBuilder builder = new URIBuilder();
        builder.setScheme("http").setHost("hostname")
        .setPort(8080)
        .setPath("/oauth/check_token")
        .setParameter("token", "7e9e5b81-1009-49cb-b71f-f418c6b1db3f");

        URI uri;

        try {
            uri = builder.build();
            System.out.println("URL Token1 : "+uri);
              HttpPost httppost = new HttpPost(uri);
                HttpResponse response = httpclient.execute(httppost);
                System.out.println("URL Token : "+response);
        } catch (URISyntaxException | IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

回应是：

HTTP/1.1 400 Bad Request [Server: Apache-Coyote/1.1, Access-Control-Allow-Origin: *, X-Content-Type-Options: nosniff, X-XSS-Protection: 1; mode=block, Cache-Control: no-cache, no-store, max-age=0, must-revalidate, Pragma: no-cache, Expires: 0, X-Frame-Options: DENY, X-Application-Context: api-gateway-uaa:dev:8080, Cache-Control: no-store, Pragma: no-cache, Content-Type: application/json;charset=UTF-8, Transfer-Encoding: chunked, Date: Wed, 25 May 2016 15:08:27 GMT, Connection: close]

Answer 1

如果您的目标是能够将POST请求发送到Rest API URL，请检查How to send a POST reqeust in Java处的示例代码并尝试其中的一个实现。

Answer 2

看起来你需要将token属性实际添加到帖子的有效负载中，而不是作为URL参数。这就是-d选项在Curl上的作用。

这样做的简单方法就是做这样的事情

List<NameValuePair> data = new new ArrayList<NameValuePair>();
data.add(new BasicNameValuePair("token","7e9e5b81-1009-49cb-b71f-f418c6b1db3f"));

httppost.setEntity(new UrlEncodedFormEnity(data));

[编辑]看起来您可能还需要设置内容类型标头。 Curl补充说＆＃34; content-type application / x-www-form-urlencoded＆＃34;自动，所以你也需要将它添加到帖子中。

httppost.addHeader(new BasicHeader("Content-Type","application/x-www-form-urlencoded"));