实现api返回json数据并在调用api时处理json数据

json数据如下

    "name": [
        {
            "age": 25,
            "height": 160,
            "weight": 100,
            "email": "1946898935"
        },
        {
            "age": 26,
            "height": 178,
            "weight": 140,
            "email": "1234567"
        }
    ],
    "address": [
        {
            "addressname": "福州市"
        },
        {
            "addressname": "厦门市"
        }
    ]
}

下面的代码是访问一个页面并同时调用一个api；

@RequestMapping("/myapitest")//url映射地址
	public ModelAndView apitest(){
	/*	
	*这是一个页面访问urlmapping
	*
	*
	*/
//		System.out.println(mysendGet("http://localhost:8080/weidaiTest/testapi","param=p"));
		String s = mysendGet("http://localhost:8080/weidaiTest/testapi","param=p");//通过mysendGet函数调用接口
		JSONObject json = JSONObject.fromObject(s);//将字符串转化为json对象
		JSONArray jary = json.getJSONArray("name");//去到name对应的数组
		System.out.println(JSONObject.fromObject(jary.get(0)).get("email"));//数组内部的元素是对象，见上面的ison数据，对应到eamil的1946898935
		ModelAndView mv = new ModelAndView("test");//要返回到浏览器的页面
		return mv;
	}

以下是调用接口的函数

public static String mysendGet(String url, String param) {
		String result = "";
		BufferedReader in = null;
		try {
			String urlNameString = url + "?" + param;
//			System.out.println("请求地址是"+urlNameString);
			URL realUrl = new URL(urlNameString);
			// 打开和URL之间的连接
			URLConnection connection = realUrl.openConnection();
			// 设置通用的请求属性
	
			// 建立实际的连接
			connection.connect();
			// 定义 BufferedReader输入流来读取URL的响应
			in = new BufferedReader(new InputStreamReader(
					connection.getInputStream()));
			String line;
			while ((line = in.readLine()) != null) {
				System.out.println(line);
				result+=line;
			}
			System.out.println("String在mysendget："+result);
			System.out.println("JSONObject在mysendget："+JSONObject.fromObject(result));
		} catch (Exception e) {
			System.out.println("发送GET请求出现异常！" + e);
			e.printStackTrace();
		}
		// 使用finally块来关闭输入流
		finally {
			try {
				if (in != null) {
					in.close();
				}
			} catch (Exception e2) {
				e2.printStackTrace();
			}
		}
		
		return JSONObject.fromObject(result).toString();//可以直接返回result
	}

下面是一个极其简易的接口，接口返回的是json格式的字符串

@RequestMapping(value="/testapi",method=RequestMethod.GET)
	@ResponseBody
	public String testapi(HttpServletRequest req,HttpServletResponse rpon){
		/*	
		*这是一个接口
		*
		*
		*/
//		System.out.println("调用了接口testapi并且获取到了参数param="+req.getParameter("param"));
		String s = "{\"name\":[{\"age\":25,\"height\":160,\"weight\":100,\"email\":\"1946898935\"},{\"age\":26,\"height\":178,\"weight\":140,\"email\":\"1234567\"}],\"address\":[{\"addressname\":\"福州市\"},{\"addressname\":\"厦门市\"}]}";
		//JSONObject json = JSONObject.fromObject(s);
		return s;
	}