JAVA发送POST请求

灰太狼 2022-05-10 12:00 229阅读 0赞

java向第三方发送post请求，数据格式为json。废话不多说，直接上代码

import com.alibaba.fastjson.JSON;
    import org.apache.commons.httpclient.HttpClient;
    import org.apache.commons.httpclient.methods.InputStreamRequestEntity;
    import org.apache.commons.httpclient.methods.PostMethod;
    import org.apache.commons.httpclient.methods.RequestEntity;
    import org.apache.commons.httpclient.params.HttpMethodParams;
    import org.apache.http.HttpResponse;
    import org.apache.http.client.methods.HttpPost;
    import org.omg.Messaging.SYNC_WITH_TRANSPORT;
    
    import java.io.ByteArrayInputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.net.URL;
    import java.util.HashMap;
    import java.util.Map;
    
    public class HttpRequestTest {
    
    
        public static void main(String [] args ) throws Exception {
            httpPost();
        }
    
    
    
    // get请求
    // 实际的请求头设置还不完善，以后再补充
      public static void httpGet() throws IOException {
            HttpClient client = new HttpClient();
            GetMethod getMethod = new GetMethod("http://。。。");
            int i = client.executeMethod(getMethod);
            System.out.println(new String(getMethod.getResponseBody()));
        }
    
        // 向第三方接口发送一个post 请求的参数的看具体的要求，该接口想要的数据是什么类型，如果是json，那就把参数转换为json类型，其他的转换为其它类型，如阿里的接口参数就有的不是json类型
        public static void httpPost() throws Exception {
    
            // json格式的参数，我们可以用map来封装参数，然后将参数转换为json格式
            Map<String ,Object> params = new HashMap<>();
            params.put("articleID",44);
            params.put("columnID",44);
            params.put("desColumnID",44);
            params.put("title","44");
            params.put("subTitle","44");
            params.put("leadTitle","44");
            params.put("abstract","44");
            params.put("articleType",0);
            params.put("source","44");
            params.put("tag","44");
            params.put("optUser","44");
            params.put("author","44");
            params.put("editor","44");
            params.put("liability","44");
            params.put("status",1);
            params.put("content","44");
            params.put("imgUrl","44");
            String paramsJson = JSON.toJSONString(params); // 将参数转换为json字符串
            System.out.println(paramsJson);
    
            //String params="{\"articleID\":44,\"columnID\":44,\"desColumnID\":44,\"title\":\"44\",\"subTitle\":\"44\",\"leadTitle\":\"44\",\"abstract\":\"44\",\"articleType\":0,\"source\":44\",\"tag\":\"44\",\"optUser\":\"44\",\"author\":\"44\",\"editor\":\"44\",\"liability\":\"44\",\"status\":1,\"content\":\"44\",\"imgUrl\":\"http://dev-file.aimingtai.com/webdata/45/images/2018/0829/15355154473121002.jpg\"}";
    
    
            // 服务端通常是根据请求头（headers）中的 Content-Type 字段来获知请求中的消息主体是用何种方式编码，再对主体进行解析。所以说到 POST 提交数据方案，包含了 Content-Type 和消息主体编码方式两部分
            HttpClient client = new HttpClient(); // 客户端实例化
            PostMethod postMethod = new PostMethod("http://。。。。"); // 请求方法post，可以将请求路径传入构造参数中
            postMethod.addRequestHeader("Content-type", "application/json; charset=utf-8");
    
            byte[] requestBytes = paramsJson.getBytes("utf-8"); // 将参数转为二进制流
            InputStream inputStream = new ByteArrayInputStream(requestBytes, 0,
                    requestBytes.length);
            RequestEntity requestEntity = new InputStreamRequestEntity(inputStream,
                    requestBytes.length, "application/json; charset=utf-8"); // 请求体
            postMethod.setRequestEntity(requestEntity);   // 将参数放入请求体
    
            int i = client.executeMethod(postMethod);  // 执行方法
            System.out.println("请求状态"+i); 
            // 这里因该有判断的，根据请求状态判断请求是否成功，然后根据第三方接口返回的数据格式，解析出我们需要的数据
            
            byte[] responseBody = postMethod.getResponseBody(); // 得到相应数据
            String s = new String(responseBody);
            System.out.println(s);
    
        }
    
    
    
    }

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