HttpClient 詳解

參考 https://blog.csdn.net/justry_deng/article/details/81042379
感謝大佬分享的demo
自己練習下，記錄只爲了下次更方便的查找，侵權刪

http 請求，apache 的一套封裝不錯的http請求
下面的案例都是先有http請求的，再有接口。

get 無參請求

 	/**
     * get 無參請求
     */
    @Test
    public void doGetTestOne() {
        // 獲得Http客戶端(可以理解爲:你得先有一個瀏覽器;注意:實際上HttpClient與瀏覽器是不一樣的)
        CloseableHttpClient httpClient = HttpClientBuilder.create().build();
        // 創建Get請求
        HttpGet httpGet = new HttpGet("http://192.168.6.9:8060/ronghe/exBox/v1/getNoParams");

        // 響應模型
        CloseableHttpResponse response = null;
        try {
            // 由客戶端執行(發送)Get請求
            response = httpClient.execute(httpGet);
            // 從響應模型中獲取響應實體
            org.apache.http.HttpEntity responseEntity = response.getEntity();
            System.out.println("響應狀態爲:" + response.getStatusLine());// 響應狀態爲:HTTP/1.1 200
            if (responseEntity != null) {
                System.out.println("響應內容長度爲:" + responseEntity.getContentLength());// 響應內容長度爲:3
                System.out.println("響應內容爲:" + EntityUtils.toString(responseEntity));//響應內容爲:123
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                // 釋放資源
                if (httpClient != null) {
                    httpClient.close();
                }
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

	@GetMapping("/v1/getNoParams")
	public String getNoParams(){
	    return "123";
	}

GET有參(方式一：直接拼接URL)：

	/**
     * get 有參請求（通過url方式傳參）
     */
    @Test
    public void doGetTestWayOne() {
        // 獲得Http客戶端(可以理解爲:你得先有一個瀏覽器;注意:實際上HttpClient與瀏覽器是不一樣的)
        CloseableHttpClient httpClient = HttpClientBuilder.create().build();

        // 參數
        StringBuffer params = new StringBuffer();
        try {
            // 字符數據最好encoding以下;這樣一來，某些特殊字符才能傳過去(如:某人的名字就是“&”,不encoding的話,傳不過去)
            params.append("username=" + URLEncoder.encode("&", "utf-8"));
//            params.append("&");
//            params.append("age=24");
        } catch (UnsupportedEncodingException e1) {
            e1.printStackTrace();
        }

        // 創建Get請求
        HttpGet httpGet = new HttpGet("http://192.168.6.9:8060/ronghe/exBox/v1/getParamsByUrl" + "?" + params);
        // 響應模型
        CloseableHttpResponse response = null;
        try {
            // 配置信息
            RequestConfig requestConfig = RequestConfig.custom()
                    // 設置連接超時時間(單位毫秒)
                    .setConnectTimeout(5000)
                    // 設置請求超時時間(單位毫秒)
                    .setConnectionRequestTimeout(5000)
                    // socket讀寫超時時間(單位毫秒)
                    .setSocketTimeout(5000)
                    // 設置是否允許重定向(默認爲true)
                    .setRedirectsEnabled(true).build();

            // 將上面的配置信息 運用到這個Get請求裏
            httpGet.setConfig(requestConfig);

            // 由客戶端執行(發送)Get請求
            response = httpClient.execute(httpGet);

            // 從響應模型中獲取響應實體
            org.apache.http.HttpEntity responseEntity  = response.getEntity();
            System.out.println("響應狀態爲:" + response.getStatusLine());
            if (responseEntity != null) {
                System.out.println("響應內容長度爲:" + responseEntity.getContentLength());
                System.out.println("響應內容爲:" + EntityUtils.toString(responseEntity));//響應內容爲:&
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                // 釋放資源
                if (httpClient != null) {
                    httpClient.close();
                }
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    @GetMapping("/v1/getParamsByUrl")
    public String getParamsByUrl(String username){
        return username;
    }

GET—有參測試 (方式二:將參數放入鍵值對類中）

/**
     * GET---有參測試 (方式二:將參數放入鍵值對類中,再放入URI中,從而通過URI得到HttpGet實例)
     */
    @Test
    public void doGetTestWayTwo() {
        // 獲得Http客戶端(可以理解爲:你得先有一個瀏覽器;注意:實際上HttpClient與瀏覽器是不一樣的)
        CloseableHttpClient httpClient = HttpClientBuilder.create().build();

        // 參數
        URI uri = null;
        try {
            // 將參數放入鍵值對類NameValuePair中,再放入集合中
            List<NameValuePair> params = new ArrayList<>();
            params.add(new BasicNameValuePair("username", "&"));
            // 設置uri信息,並將參數集合放入uri;
            // 注:這裏也支持一個鍵值對一個鍵值對地往裏面放setParameter(String key, String value)
            uri = new URIBuilder().setScheme("http").setHost("192.168.6.9")
                    .setPort(8060).setPath("/ronghe/exBox/v1/getParams")
                    .setParameters(params).build();
        } catch (URISyntaxException e1) {
            e1.printStackTrace();
        }
        // 創建Get請求
        HttpGet httpGet = new HttpGet(uri);

        // 響應模型
        CloseableHttpResponse response = null;
        try {
            // 配置信息
            RequestConfig requestConfig = RequestConfig.custom()
                    // 設置連接超時時間(單位毫秒)
                    .setConnectTimeout(5000)
                    // 設置請求超時時間(單位毫秒)
                    .setConnectionRequestTimeout(5000)
                    // socket讀寫超時時間(單位毫秒)
                    .setSocketTimeout(5000)
                    // 設置是否允許重定向(默認爲true)
                    .setRedirectsEnabled(true).build();

            // 將上面的配置信息 運用到這個Get請求裏
            httpGet.setConfig(requestConfig);

            // 由客戶端執行(發送)Get請求
            response = httpClient.execute(httpGet);

            // 從響應模型中獲取響應實體
            org.apache.http.HttpEntity responseEntity = response.getEntity();
            System.out.println("響應狀態爲:" + response.getStatusLine());
            if (responseEntity != null) {
                System.out.println("響應內容長度爲:" + responseEntity.getContentLength());
                System.out.println("響應內容爲:" + EntityUtils.toString(responseEntity));
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                // 釋放資源
                if (httpClient != null) {
                    httpClient.close();
                }
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

	@GetMapping("/v1/getParams")
    public String getParams(String username){
        log.info("getNoParams: " + username);
        return username;
    }

post 無參請求

	/**
     * POST---無參測試
     */
    @Test
    public void doPostTestOne() {

        // 獲得Http客戶端(可以理解爲:你得先有一個瀏覽器;注意:實際上HttpClient與瀏覽器是不一樣的)
        CloseableHttpClient httpClient = HttpClientBuilder.create().build();

        // 創建Post請求
        HttpPost httpPost = new HttpPost("http://192.168.6.9:8060/ronghe/exBox/v1/postForNoParams");
        // 響應模型
        CloseableHttpResponse response = null;
        try {
            // 由客戶端執行(發送)Post請求
            response = httpClient.execute(httpPost);
            // 從響應模型中獲取響應實體
            org.apache.http.HttpEntity responseEntity = response.getEntity();

            System.out.println("響應狀態爲:" + response.getStatusLine());
            if (responseEntity != null) {
                System.out.println("響應內容長度爲:" + responseEntity.getContentLength());
                System.out.println("響應內容爲:" + EntityUtils.toString(responseEntity));//響應內容爲:123
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                // 釋放資源
                if (httpClient != null) {
                    httpClient.close();
                }
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    @PostMapping("/v1/postForNoParams")
    public String postForNoParams(){
        return "123";
    }

POST有參(普通參數)

/**
     * POST---有參測試(普通參數)
     */
    @Test
    public void doPostTestFour() {

        // 獲得Http客戶端(可以理解爲:你得先有一個瀏覽器;注意:實際上HttpClient與瀏覽器是不一樣的)
        CloseableHttpClient httpClient = HttpClientBuilder.create().build();

        // 參數
        StringBuffer params = new StringBuffer();
        try {
            // 字符數據最好encoding以下;這樣一來，某些特殊字符才能傳過去(如:某人的名字就是“&”,不encoding的話,傳不過去)
            params.append("username=" + URLEncoder.encode("&", "utf-8"));
        } catch (UnsupportedEncodingException e1) {
            e1.printStackTrace();
        }
        // 創建Post請求
        HttpPost httpPost = new HttpPost("http://192.168.6.9:8060/ronghe/exBox/v1/postForParams" + "?" + params);

        // 設置ContentType(注:如果只是傳普通參數的話,ContentType不一定非要用application/json)
        httpPost.setHeader("Content-Type", "application/json;charset=utf8");

        // 響應模型
        CloseableHttpResponse response = null;
        try {
            // 由客戶端執行(發送)Post請求
            response = httpClient.execute(httpPost);
            // 從響應模型中獲取響應實體
            org.apache.http.HttpEntity responseEntity = response.getEntity();

            System.out.println("響應狀態爲:" + response.getStatusLine());
            if (responseEntity != null) {
                System.out.println("響應內容長度爲:" + responseEntity.getContentLength());
                System.out.println("響應內容爲:" + EntityUtils.toString(responseEntity));//響應內容爲:&
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                // 釋放資源
                if (httpClient != null) {
                    httpClient.close();
                }
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    @PostMapping("/v1/postForParams")
    public String postForParams(String username){
        log.info("postForParams"+username);
        return username;
    }

POST有參(對象參數)

@Test
    public void doPostTestTwo() {

        // 獲得Http客戶端(可以理解爲:你得先有一個瀏覽器;注意:實際上HttpClient與瀏覽器是不一樣的)
        CloseableHttpClient httpClient = HttpClientBuilder.create().build();

        // 創建Post請求
        HttpPost httpPost = new HttpPost("http://192.168.6.9:8060/ronghe/exBox/v1/postForObject");
        User user = new User("123");
//        user.setName("潘曉婷");
//        user.setAge(18);
//        user.setGender("女");
//        user.setMotto("姿勢要優雅~");
        // 我這裏利用阿里的fastjson，將Object轉換爲json字符串;
        // (需要導入com.alibaba.fastjson.JSON包)
        String jsonString = JSON.toJSONString(user);

        StringEntity entity = new StringEntity(jsonString, "UTF-8");

        // post請求是將參數放在請求體裏面傳過去的;這裏將entity放入post請求體中
        httpPost.setEntity(entity);

        httpPost.setHeader("Content-Type", "application/json;charset=utf8");

        // 響應模型
        CloseableHttpResponse response = null;
        try {
            // 由客戶端執行(發送)Post請求
            response = httpClient.execute(httpPost);
            // 從響應模型中獲取響應實體
//            HttpEntity responseEntity =
            org.apache.http.HttpEntity responseEntity = response.getEntity();

            System.out.println("響應狀態爲:" + response.getStatusLine());
            if (responseEntity != null) {
                System.out.println("響應內容長度爲:" + responseEntity.getContentLength());
                System.out.println("響應內容爲:" + EntityUtils.toString(responseEntity));
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                // 釋放資源
                if (httpClient != null) {
                    httpClient.close();
                }
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    @PostMapping("/v1/postForObject")
    public String postForObject(@RequestBody User user){
        log.info("postForParams"+user.getUsername());
        return user.getUsername();
    }

POST有參(普通參數 + 對象參數)

@Test
    public void doPostTestThree() {

        // 獲得Http客戶端(可以理解爲:你得先有一個瀏覽器;注意:實際上HttpClient與瀏覽器是不一樣的)
        CloseableHttpClient httpClient = HttpClientBuilder.create().build();

        // 創建Post請求
        // 參數
        URI uri = null;
        try {
            // 將參數放入鍵值對類NameValuePair中,再放入集合中
            List<NameValuePair> params = new ArrayList<>();
            params.add(new BasicNameValuePair("version", "1.0.0"));
            // 設置uri信息,並將參數集合放入uri;
            // 注:這裏也支持一個鍵值對一個鍵值對地往裏面放setParameter(String key, String value)
//            http://192.168.6.9:8060/ronghe/exBox/v1/postForParamsAndObject
            uri = new URIBuilder().setScheme("http").setHost("192.168.6.9").setPort(8060)
                    .setPath("/ronghe/exBox/v1/postForParamsAndObject").setParameters(params).build();
        } catch (URISyntaxException e1) {
            e1.printStackTrace();
        }

        HttpPost httpPost = new HttpPost(uri);
        // HttpPost httpPost = new
        // HttpPost("http://localhost:12345/doPostControllerThree1");

        // 創建user參數
        User user = new User("123");
//        user.setName("潘曉婷");
//        user.setAge(18);
//        user.setGender("女");
//        user.setMotto("姿勢要優雅~");

        // 將user對象轉換爲json字符串，並放入entity中
        StringEntity entity = new StringEntity(JSON.toJSONString(user), "UTF-8");

        // post請求是將參數放在請求體裏面傳過去的;這裏將entity放入post請求體中
        httpPost.setEntity(entity);

        httpPost.setHeader("Content-Type", "application/json;charset=utf8");

        // 響應模型
        CloseableHttpResponse response = null;
        try {
            // 由客戶端執行(發送)Post請求
            response = httpClient.execute(httpPost);
            // 從響應模型中獲取響應實體
            org.apache.http.HttpEntity responseEntity = response.getEntity();

            System.out.println("響應狀態爲:" + response.getStatusLine());
            if (responseEntity != null) {
                System.out.println("響應內容長度爲:" + responseEntity.getContentLength());
                //String res = EntityUtils.toString(responseEntity, StandardCharsets.UTF_8); // 獲取遠程數據，主動修改編碼集
                System.out.println("響應內容爲:" + EntityUtils.toString(responseEntity));//響應內容爲:123-1.0.0
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                // 釋放資源
                if (httpClient != null) {
                    httpClient.close();
                }
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    @PostMapping("/v1/postForParamsAndObject")
    public String postForParamsAndObject(String version , @RequestBody User user){
        log.info("postForParamsAndObject:"+user.getUsername() + " version:"+ version);
        return StringUtils.join(new String[]{user.getUsername(),version},"-");
    }

解決亂碼

參考上面一個例子，補充處

進行HTTPS請求並進行(或不進行)證書校驗(示例)

暫未測試，請參考
https://blog.csdn.net/justry_deng/article/details/81042379

application/x-www-form-urlencoded表單請求(示例)

    /**
     * get 無參請求(form 請求)
     */
    @Test
    public void doForm() {
        // 獲得Http客戶端(可以理解爲:你得先有一個瀏覽器;注意:實際上HttpClient與瀏覽器是不一樣的)
        CloseableHttpClient httpClient = HttpClientBuilder.create().build();
        // 創建Get請求
        HttpGet httpGet = new HttpGet("http://localhost:8060/ronghe/exBox/v1/getForm");
        httpGet.setHeader("Content-Type","application/x-www-form-urlencoded");
        // 響應模型
        CloseableHttpResponse response = null;
        try {
            // 由客戶端執行(發送)Get請求
            response = httpClient.execute(httpGet);
            // 從響應模型中獲取響應實體
            org.apache.http.HttpEntity responseEntity = response.getEntity();
            System.out.println("響應狀態爲:" + response.getStatusLine());// 響應狀態爲:HTTP/1.1 200
            if (responseEntity != null) {
                System.out.println("響應內容長度爲:" + responseEntity.getContentLength());// 響應內容長度爲:3
                System.out.println("響應內容爲:" + EntityUtils.toString(responseEntity));//響應內容爲:123
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                // 釋放資源
                if (httpClient != null) {
                    httpClient.close();
                }
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

 	/**
     * 表單請求
     * @return
     */
    @GetMapping(value = "/v1/getForm",consumes = "application/x-www-form-urlencoded")
    public String getForm(){
        return "123";
    }

HttpClient 詳解

HttpClient 詳解

get 無參請求

GET有參(方式一：直接拼接URL)：

GET—有參測試 (方式二:將參數放入鍵值對類中）

post 無參請求

POST有參(普通參數)

POST有參(對象參數)

POST有參(普通參數 + 對象參數)

解決亂碼

進行HTTPS請求並進行(或不進行)證書校驗(示例)

application/x-www-form-urlencoded表單請求(示例)

Semaphore 簡單使用

Slf4j MDC機制及日誌應用實戰

HttpClient 詳解

ThreadLocal及應用

Atomic XXX 的原子操作

https://yachay.unat.edu.pe/blog/index.php?comment_area=format_blog&comment_component=blog&comment_co

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