java请求http和https

Java中请求HTTP和HTTPS是非常常见的操作，本篇文章将介绍如何使用Java进行HTTP和HTTPS的请求。首先我们需要引入java的相关类库，如下代码：

import java.net.HttpURLConnection;
    import java.net.URL;
    import java.io.BufferedReader;
    import java.io.InputStreamReader;
    import javax.net.ssl.HttpsURLConnection;
    

HTTP请求：

URL url = new URL("http://www.example.com");
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    conn.setRequestMethod("GET");
    conn.setRequestProperty("Accept", "application/json");
if (conn.getResponseCode() != 200) {
    throw new RuntimeException("Failed : HTTP error code : "+ conn.getResponseCode());
}
    BufferedReader br = new BufferedReader(new InputStreamReader((conn.getInputStream())));
    String output;
    System.out.println("Output from Server .... \n");
while ((output = br.readLine()) != null) {
    System.out.println(output);
}
    conn.disconnect();
    

HTTPS请求：

URL url = new URL("https://www.example.com");
    HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
    conn.setRequestMethod("GET");
    conn.setRequestProperty("Accept", "application/json");
if (conn.getResponseCode() != 200) {
    throw new RuntimeException("Failed : HTTP error code : "+ conn.getResponseCode());
}
    BufferedReader br = new BufferedReader(new InputStreamReader((conn.getInputStream())));
    String output;
    System.out.println("Output from Server .... \n");
while ((output = br.readLine()) != null) {
    System.out.println(output);
}
    conn.disconnect();
    

在HTTPS请求中，需要注意的是要开启SSL证书验证，方法如下：

System.setProperty("javax.net.ssl.trustStore", "path-to-truststore");
    System.setProperty("javax.net.ssl.trustStorePassword", "truststore-password");
    

以上就是Java请求HTTP和HTTPS的相关代码，使用时根据需求进行代码修改即可。

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