HttpClient CloseableHttpClient GetMethod PostMethod http

pom依賴

        <!--HttpClient的依賴-->
        <dependency>
            <groupId>commons-httpclient</groupId>
            <artifactId>commons-httpclient</artifactId>
            <version>3.1</version>
        </dependency>

        <!--CloseableHttpClient的依賴-->
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.2</version>
        </dependency>

HttpClient 的get請求方式

private static void doGet() {
    HttpClient client = new HttpClient();
    GetMethod getMethod = new GetMethod("https://www.thepaper.cn/");
    int code = 0;
    try {
        code = client.executeMethod(getMethod); // 返回StatusCode,即狀態碼
        if (code == 200) {
            String res = getMethod.getResponseBodyAsString();  // 這個代碼,沒太理解。
            System.out.println(res);
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}
  • idea運行結果:

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  • postman調試結果:

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HttpClient 的post請求方式

private static void doPost() {
    String praiseUrl = "https://www.thepaper.cn/www/commentPraise.msp"; // 澎湃新聞評論點贊url
    HttpClient client = new HttpClient(); // httpClient
    PostMethod postMethod = new PostMethod(praiseUrl);  // postMethod
    // 必須設置下面這個Header  設置請求頭
    postMethod.addRequestHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 " +
            "(KHTML, like Gecko) Chrome/58.0.3029.81 Safari/537.36");

    postMethod.addParameter("commentId", "18718372"); // 評論的id,抓包獲得
    try {
        int code = client.executeMethod(postMethod); // 獲取返回碼。
        if (code == 200) {
            String res = postMethod.getResponseBodyAsString(); // 獲取響應的 響應體。
            System.out.println(res);
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}
  • idea運行結果:

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  • post請求結果:

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CloseableHttpClient的get請求方式

public static void doGet() {
    CloseableHttpClient client = HttpClientBuilder.create().build(); // 獲取http客戶端。
    HttpGet get = new HttpGet("http://www.thepaper.cn"); // 建立httpGet
    try {
        // 很奇怪,使用CloseableHttpClient來請求澎湃新聞的首頁,GTE請求也必須加上下面這個Header,但是使用HTTPClient則不需要
        get.addHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like " +
                "Gecko) Chrome/58.0.3029.81 Safari/537.36"); // 加上請求頭
        HttpResponse response = client.execute(get); // 獲取響應。response

        String res = EntityUtils.toString(response.getEntity()); // 獲取響應體。
        System.out.println(res);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

CloseableHttpClient的post請求方式

public static void doPost() {
    CloseableHttpClient client = HttpClientBuilder.create().build();
    HttpPost post = new HttpPost("https://www.thepaper.cn/www/commentPraise.msp");
    try {
        post.addHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like " +
                "Gecko) Chrome/58.0.3029.81 Safari/537.36");
        List<NameValuePair> params = new ArrayList<>();
        params.add(new BasicNameValuePair("commentId", "18718372"));
        post.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
        HttpResponse response = client.execute(post);
        String res = EntityUtils.toString(response.getEntity());
        System.out.println(res);
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}
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