java:后台调用接口链接方式（HttpURLConnection）

柔情只为你懂 2022-12-13 01:38 170阅读 0赞

首先贴了一个完整的方法

public class ConnectionUtils {
    
        /**
         * 
         * @param path  路径
         * @param method  查询方法
         * @param param  查询参数
         * @return
         * @throws IOException
         */
        public static String SearchQualifications(String path, String method, Map<String, Object> param) throws IOException {
    
            OutputStreamWriter out = null;
            BufferedReader br = null;
            String data = null;
            StringBuffer result = new StringBuffer("");
            /*处理data信息*/
            data = JSONObject.toJSONString(param);
            URL url = new URL(path);
    
            /*打开链接*/
            HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
    
            /*设置请求方式*/
            httpURLConnection.setRequestMethod(method);
    
            /*设置通用请求属性*/
            httpURLConnection.setRequestProperty("accept", "*/*");
            httpURLConnection.setRequestProperty("connection", "Keep-Alive");
            httpURLConnection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
            httpURLConnection.setRequestProperty("Content-Type", "application/json;charset=utf-8");
    
            //DoOutput设置是否向httpUrlConnection输出，DoInput设置是否从httpUrlConnection读入，此外发送post请求必须设置这两个
            httpURLConnection.setDoOutput(true);
            httpURLConnection.setDoInput(true);
    
            /*写入数据*/
            out = new OutputStreamWriter(httpURLConnection.getOutputStream(), "UTF-8");
            out.write(data);
            out.flush();
    
            /*获取输入流*/
            InputStream inputStream = httpURLConnection.getInputStream();
            br = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
    
            String str = "";
            while ((str = br.readLine()) != null) {
                result.append(str);
            }
            String resultStr = result.toString();
            return resultStr;
        }
    }

主要分为了几个模块

1、创建 URL、Connection通道

URL url = new URL(path);
    
    /*打开链接*/
    /*对 url 产生的 URLConnection 进行强转*/
    HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();

2、设置通道属性和请求方式

/*设置请求方式*/
            httpURLConnection.setRequestMethod(method);
    
            /*设置通用请求属性*/
            httpURLConnection.setRequestProperty("accept", "*/*");
            httpURLConnection.setRequestProperty("connection", "Keep-Alive");
            httpURLConnection.setRequestProperty("Content-Type", "application/json;charset=utf-8");
    
            //DoOutput设置是否向httpUrlConnection输出，DoInput设置是否从httpUrlConnection读入，此外发送post请求必须设置这两个
            httpURLConnection.setDoOutput(true);
            httpURLConnection.setDoInput(true);

3、写入数据、读取数据

/*写入数据*/
            out = new OutputStreamWriter(httpURLConnection.getOutputStream(), "UTF-8");
            out.write(data);
            out.flush();
    
            /*获取输入流*/
            InputStream inputStream = httpURLConnection.getInputStream();
            br = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
    
            String str = "";
            while ((str = br.readLine()) != null) {
                result.append(str);
            }
            String resultStr = result.toString();
            return resultStr;
        }

因为我这边调用的接口是返回json字符串类型。所以我是直接返回的 String类型。

暂时就这。