java调用第三方接口post请求,josn返回与解析

1.拿到接口文档

首先我们会得到第三方公司的接口文档,我们会依据其中的规范去做请求的参数或者获取加密手段

2.代码实践

需求

package com.seeyon.apps.hd.controller;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import net.sf.json.JSONObject;

public class JSONJavaHttpDemo {
	//传递url
	public static final String ADD_URL = " 这里填写接口文档访问的url";

	public static void appadd() {

		try {
			// 创建连接
			URL url = new URL(ADD_URL);
			HttpURLConnection connection = (HttpURLConnection) url.openConnection();
			connection.setDoOutput(true);
			connection.setDoInput(true);
			connection.setRequestMethod("POST");
			connection.setUseCaches(false);
			connection.setInstanceFollowRedirects(true);
			//设置请求头
			connection.setRequestProperty("Content-Type", "application/json");

			connection.connect();

			// POST请求,包装成json数据
			DataOutputStream out = new DataOutputStream(connection.getOutputStream());
			JSONObject obj = new JSONObject();
			obj.element("app_name", "asdf");
			obj.element("app_ip", "10.192.203.46");
			obj.element("app_port", 8080);
			obj.element("app_type", "001");
			obj.element("app_area", "asd");

			out.writeBytes(obj.toString());
			out.flush();
			out.close();

			// 读取响应
			BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
			String lines;
			StringBuffer sb = new StringBuffer("");
			while ((lines = reader.readLine()) != null) {
				lines = new String(lines.getBytes(), "utf-8");
				sb.append(lines);
			}
			System.out.println(sb);
			reader.close();
			// 断开连接
			connection.disconnect();
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

	}

	public static void main(String[] args) {
		appadd();
	}

}