java - 获取 JSON 响应作为 Java 中 Rest 调用的一部分

Question

我正在尝试用 Java 调用 Rest 服务。我是网络和休息服务的新手。我有 Rest 服务，它返回 JSON 作为响应。我有以下代码，但我认为它不完整，因为我不知道如何使用 JSON 处理输出。

public static void main(String[] args) {
        try { 
            
            URL url = new URL("http://example.com:7000/test/db-api/processor"); 
            HttpURLConnection connection = (HttpURLConnection) url.openConnection(); 
            connection.setDoOutput(true); 
            connection.setInstanceFollowRedirects(false); 
            connection.setRequestMethod("PUT"); 
            connection.setRequestProperty("Content-Type", "application/json"); 

            OutputStream os = connection.getOutputStream(); 
           //how do I get json object and print it as string
            os.flush(); 

            connection.getResponseCode(); 
            connection.disconnect(); 
        } catch(Exception e) { 
            throw new RuntimeException(e); 
        } 

    }

我是 Rest 服务和 JSON 的新手。

Answer 1

因为这是一个 PUT 请求，所以您在这里遗漏了一些东西:

OutputStream os = conn.getOutputStream();
os.write(input.getBytes()); // The input you need to pass to the webservice
os.flush();
...
BufferedReader br = new BufferedReader(new InputStreamReader(
        (conn.getInputStream()))); // Getting the response from the webservice

String output;
System.out.println("Output from Server .... \n");
while ((output = br.readLine()) != null) {
    System.out.println(output); // Instead of this, you could append all your response to a StringBuffer and use `toString()` to get the entire JSON response as a String.
    // This string json response can be parsed using any json library. Eg. GSON from Google.
}

看看this对点击网络服务有更清晰的想法。