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:
- postman調試結果:
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:
- post請求結果:
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();
}
}