怎么调用别人接口？

Posted 2021-05-18 秃头谷雨

目录

 

前言

一、怎么调用别人接口？

二、使用步骤

1.配置restTemplateConfig

2.自己测试一下

总结

---

---

前言

工作中调别人接口拿数据必不可少 应该怎么取拿呢

---

提示：确实是非常非常的简单~~~~~

一、怎么调用别人接口？

往下看~~~~~

二、使用步骤

1.配置restTemplateConfig

不配置用不了！！！！：

@Configuration
public class restTemplateConfig {
    private static final Logger logger= LoggerFactory.getLogger(restTemplateConfig.class);

    @Bean
    public RestTemplate restTemplate() {
        // 添加内容转换器,使用默认的内容转换器
        RestTemplate restTemplate = new RestTemplate(httpRequestFactory());
        // 设置编码格式为UTF-8
        List<HttpMessageConverter<?>> converterList = restTemplate.getMessageConverters();
        HttpMessageConverter<?> converterTarget = null;
        for (HttpMessageConverter<?> item : converterList) {
            if (item.getClass() == StringHttpMessageConverter.class) {
                converterTarget = item;
                break;
            }
        }
        if (converterTarget != null) {
            converterList.remove(converterTarget);
        }
        HttpMessageConverter<?> converter = new StringHttpMessageConverter(StandardCharsets.UTF_8);
        converterList.add(1,converter);

        return restTemplate;
    }

    @Bean
    public ClientHttpRequestFactory httpRequestFactory() {

        return new HttpComponentsClientHttpRequestFactory(httpClient());

    }

    @Bean
    public HttpClient httpClient() {
        // 长连接保持30秒
        PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager(30, TimeUnit.SECONDS);
        //设置整个连接池最大连接数 根据自己的场景决定
        connectionManager.setMaxTotal(500);
        //同路由的并发数,路由是对maxTotal的细分
        connectionManager.setDefaultMaxPerRoute(500);

        //requestConfig
        RequestConfig requestConfig = RequestConfig.custom()
                //服务器返回数据(response)的时间，超过该时间抛出read timeout
                .setSocketTimeout(10000)
                //连接上服务器(握手成功)的时间，超出该时间抛出connect timeout
                .setConnectTimeout(5000)
                //从连接池中获取连接的超时时间，超过该时间未拿到可用连接，会抛出org.apache.http.conn.ConnectionPoolTimeoutException: Timeout waiting for connection from pool
                .setConnectionRequestTimeout(500)
                .build();
        //headers
        List<Header> headers = new ArrayList<>();
        headers.add(new BasicHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (Khtml, like Gecko) Chrome/31.0.1650.16 Safari/537.36"));
        headers.add(new BasicHeader("Accept-Encoding", "gzip,deflate"));
        headers.add(new BasicHeader("Accept-Language", "zh-CN"));
        headers.add(new BasicHeader("Connection", "Keep-Alive"));
        headers.add(new BasicHeader("Content-type", "application/json;charset=UTF-8"));

        return HttpClientBuilder.create()
                .setDefaultRequestConfig(requestConfig)
                .setConnectionManager(connectionManager)
                .setDefaultHeaders(headers)
                // 保持长连接配置，需要在头添加Keep-Alive
                .setKeepAliveStrategy(new DefaultConnectionKeepAliveStrategy())
                //重试次数，默认是3次，没有开启
                .setRetryHandler(new DefaultHttpRequestRetryHandler(2, true))
                .build();
    }
    @Bean
    public RestTemplate customRestTemplate(){
        HttpComponentsClientHttpRequestFactory httpComponentsClientHttpRequestFactory = new HttpComponentsClientHttpRequestFactory();
        httpComponentsClientHttpRequestFactory.setConnectionRequestTimeout(10);
        httpComponentsClientHttpRequestFactory.setConnectTimeout(10);
        httpComponentsClientHttpRequestFactory.setReadTimeout(10);

        return new RestTemplate(httpComponentsClientHttpRequestFactory);
    }
}

2.自己测试一下

//junit 测试~~~~

 

public class test {

    @Autowired
    RestTemplate restTemplate;

    @Test
    public void get()throws Exception {
        String url = "http://localhost/xxx/xxx?id={id}";
        Map<String, Object> paramMap = new HashMap<String, Object>();
        paramMap.put("id", 1);
        String result1 = restTemplate.getForObject(url, String.class, paramMap);
        System.out.println("result1====================" + result1);
//如果添加请求头什么的用下面这个
/*
        HttpHeaders headers = new HttpHeaders();
        HttpEntity<MultiValueMap<String, Object>> httpEntity = new HttpEntity<MultiValueMap<String, Object>>(null,headers);
        ResponseEntity<String> response2 = restTemplate.exchange(url, HttpMethod.GET, httpEntity, String.class,paramMap);
        System.out.println("result2====================" + response2.getBody());*/
    }
}

---

总结

调别人接口贼简单 这是GET请求 Post就把restTemplate.getForObject改成restTemplate.PostForObject  是不是贼简单~~~~