SpringBoot项目中第三方接口调用方式

环境：java8

1. HttpURLConnection

// 只有输出
public static void main(String[] args) throws Exception {
		
		URL url = new URL("http://localhost:50000/users?status=0") ;
		HttpURLConnection con = (HttpURLConnection) url.openConnection() ;
		con.setDoInput(true) ;
		con.setDoOutput(true) ;
		con.setRequestMethod("GET") ;
		con.setConnectTimeout(10000) ;
		con.setReadTimeout(10000) ;
		con.setRequestProperty("Content-Type", "application/json") ;
		InputStream is = con.getInputStream() ;
		BufferedReader br = new BufferedReader(new InputStreamReader(is)) ;
		String line = null ;
		while((line = br.readLine()) != null) {
			System.out.println(line) ;
		}
		br.close();
		is.close(); 
		con.disconnect() ;
		
	}
// 有输入也有输出
public static void main(String[] args) throws Exception {
		
		URL url = new URL("http://localhost:50000/users") ;
		HttpURLConnection con = (HttpURLConnection) url.openConnection() ;
		con.setDoInput(true) ;
		con.setDoOutput(true) ;
		con.setRequestMethod("POST") ;
		con.setConnectTimeout(10000) ;
		con.setReadTimeout(10000) ;
		con.setRequestProperty("Content-Type", "application/json") ;
		con.setRequestProperty("Accpet", "application/json") ;
		OutputStream os = con.getOutputStream() ;
		os.write("{\"username\": \"NB409\", \"password\": \"7777\", \"idNo\": \"7777\"}".getBytes()) ;
		os.flush() ;
		InputStream is = con.getInputStream() ;
		BufferedReader br = new BufferedReader(new InputStreamReader(is)) ;
		String line = null ;
		while((line = br.readLine()) != null) {
			System.out.println(line) ;
		}
		br.close();
		is.close(); 
		con.disconnect() ;
		
	}

返回结果：

1. Apache—HttpClient

<dependency>
			<groupId>commons-httpclient</groupId>
			<artifactId>commons-httpclient</artifactId>
			<version>3.1</version>
</dependency>

public static void get(String url) throws Exception {
		HttpClient httpClient = new HttpClient();
		httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(5000);
		GetMethod method = new GetMethod(url);
		method.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 5000);
		method.setQueryString("status=0");
		int statusCode = httpClient.executeMethod(method);
		if (statusCode != HttpStatus.SC_OK) {
			System.err.println(method.getStatusLine());
		}
		byte[] responseBody = method.getResponseBody();
		System.out.println(new String(responseBody));
	}

	public static String post(String url) throws Exception {
		HttpClient httpClient = new HttpClient();
		PostMethod method = new PostMethod(url);

		method.addRequestHeader("Accept", "application/json;charset=utf-8");
		method.addRequestHeader("Content-Type", "application/json;chrset=utf-8");
		RequestEntity requestEntity = new StringRequestEntity("{\"username\": \"NB509\", \"password\": \"7777\", \"idNo\": \"7777\"}", 
				"application/json", "UTF-8") ;
		method.setRequestEntity(requestEntity) ;
		String res = "";
		int code = httpClient.executeMethod(method);
		if (code == HttpStatus.SC_OK) {
			res = method.getResponseBodyAsString();
			System.out.println(res);
		}
		return res;
	}

	public static void main(String[] args) throws Exception {
		get("http://localhost:50000/users");
		post("http://localhost:50000/users") ;
	}

1. apache—CloseableHttpClient

<dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpclient</artifactId>
        <version>4.5.13</version>
</dependency>

public static void get(String url) throws Exception{
        CloseableHttpClient httpClient = HttpClientBuilder.create().build();
        HttpGet get = new HttpGet(url);
        HttpResponse response = httpClient.execute(get);
        if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK){
            String res = EntityUtils.toString(response.getEntity());
            System.out.println(res) ;
        }
    }

    public static void post(String url) throws Exception {
        HttpClient httpClient = HttpClientBuilder.create().build();
        HttpPost post = new HttpPost(url);
        StringEntity s = new StringEntity("{\"username\": \"NB609\", \"password\": \"7777\", \"idNo\": \"7777\"}");
        s.setContentEncoding("UTF-8");
        s.setContentType("application/json;charset=utf-8");
        post.setEntity(s);
        HttpResponse response = httpClient.execute(post);
        if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK){
            String res = EntityUtils.toString(response.getEntity());
            System.out.println(res);
        }
    }
    
    public static void main(String[] args) throws Exception {
    	get("http://localhost:50000/users?status=0");
		post("http://localhost:50000/users") ;
	}

1. RestTemplate

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.2.6.RELEASE</version>
</dependency>

public static void main(String[] args) {
		RestTemplateBuilder builder = new RestTemplateBuilder();
		RestTemplate template = builder.build() ;
		
		System.out.println(template.getForObject("http://localhost:50000/users?status=0", Object.class)) ;
	}

给个关注+转发呗，谢谢