SpringBoot中方法中用Http调用远程方法，Body传参

叁歲伎倆 2021-12-03 03:17 767阅读 0赞

场景：A服务方法中调用B服务（跨域），方式为HttpPost。postman直接调用，查询B服务返回的数据如下：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3plcm92cHA_size_16_color_FFFFFF_t_70][]

实现步骤：

1、准备好B服务的URL，用org.apache.http.client的HttpClient方法，并设置header。

String url = seagull.getSupplierUrl();
    
            HttpClient client = HttpClientBuilder.create().build();
            HttpPost httpPost = new HttpPost(url);
            httpPost.setHeader("Content-Type","application/json");//设置header

2、将参数塞入body中，传给对方，其中有个坑，参数转StringEntity时，一定要设置字符集UTF\_8，否则会取默认的ISO80009

JSONObject json = new JSONObject();
            json.put("supplierName", supplierName);
    
            StringEntity stringEntity = new StringEntity(json.toJSONString(),UTF_8);
            stringEntity.setContentType("application/json");
            httpPost.setEntity(stringEntity);

3、调用HttpClient.execute(httpPost)，查询B服务，并返回结果。

HttpResponse response = client.execute(httpPost);
            HttpEntity entity = response.getEntity();
    
            StringBuilder strBuilder = new StringBuilder();
            if (null != strBuilder ) {
                InputStream inputStream = entity.getContent();
                BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));
                String temp = "";
                while ((temp = br.readLine()) != null) {
                    String str = new String(temp.getBytes(), "utf-8");
                    strBuilder.append(str);
                }
            }
    
            String strTemp = strBuilder.toString();

其中，httpClient、HttpPost、HttpResponse都用org.apache.http下的包，别用其他的。

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