Java 接口调用

来源：互联网发布：js ajax获取json文件编辑：程序博客网时间：2024/05/18 00:18
 /**     * 向指定 URL 发送POST方法的请求          * @param url 发送请求的 URL         * @param params 请求的参数集合          * @return 远程资源的响应结果     */private String sendPost(String url, Map<String, String> params) {        OutputStreamWriter out = null;        BufferedReader in = null;                StringBuilder result = new StringBuilder();         try {            URL realUrl = new URL(url);            HttpURLConnection conn =(HttpURLConnection) realUrl.openConnection();            // 发送POST请求必须设置如下两行            conn.setDoOutput(true);            conn.setDoInput(true);            // POST方法            conn.setRequestMethod("POST");            // 设置通用的请求属性            conn.setRequestProperty("accept", "*/*");            conn.setRequestProperty("connection", "Keep-Alive");            conn.setRequestProperty("user-agent",                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");            conn.connect();            // 获取URLConnection对象对应的输出流            out = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");            // 发送请求参数                        if (params != null) {          StringBuilder param = new StringBuilder();           for (Map.Entry<String, String> entry : params.entrySet()) {          if(param.length()>0){          param.append("&");          }                    param.append(entry.getKey());          param.append("=");          param.append(entry.getValue());                    }          out.write(param.toString());            }            // flush输出流的缓冲            out.flush();            // 定义BufferedReader输入流来读取URL的响应            in = new BufferedReader(                    new InputStreamReader(conn.getInputStream(), "UTF-8"));            String line;            while ((line = in.readLine()) != null) {                result.append(line);            }        } catch (Exception e) {                        e.printStackTrace();        }        //使用finally块来关闭输出流、输入流        finally{            try{                if(out!=null){                    out.close();                }                if(in!=null){                    in.close();                }            }            catch(IOException ex){                ex.printStackTrace();            }        }        return result.toString();    }
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