javahttp请求-从零开始学习发送HTTP请求

一、如何发送HTTP请求？

发送HTTP请求的方式有多种，可以使用Java提供的HttpURLConnection类，也可以使用第三方库如Apache HttpClient或OkHttp。以下是使用HttpURLConnection发送GET请求的示例代码：

URL url = new URL("http://example.com/api");
HttpURLConnection connection =(HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
int responseCode = connection.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK){
    BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
    String line;
    StringBuilder response = new StringBuilder();
    while ((line = reader.readLine())!= null){
        response.append(line);
    reader.close();
    System.out.println(response.toString());
} else {
    System.out.println("请求失败，错误码："+ responseCode);

二、如何发送POST请求？

发送POST请求也可以使用HttpURLConnection类或第三方库。以下是使用HttpURLConnection发送POST请求的示例代码：

URL url = new URL("http://example.com/api");
HttpURLConnection connection =(HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setDoOutput(true);
DataOutputStream outputStream = new DataOutputStream(connection.getOutputStream());
String requestBody ="key1=value1&key2=value2";
outputStream.writeBytes(requestBody);
outputStream.flush();
outputStream.close();
int responseCode = connection.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK){
    BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
    String line;
    StringBuilder response = new StringBuilder();
    while ((line = reader.readLine())!= null){
        response.append(line);
    reader.close();
    System.out.println(response.toString());
} else {
    System.out.println("请求失败，错误码："+ responseCode);

三、如何处理HTTP请求的响应？

处理HTTP请求的响应可以根据实际需求进行操作。一般来说，可以通过读取响应流获取服务器返回的数据。示例代码中使用了BufferedReader逐行读取响应内容，并将其存储在StringBuilder中。最后，关闭流并打印响应内容。

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