如何在Java中发送携带JSON文件作为原始数据的POST请求（类似JMeter方式）

Got it, let's get your code working properly so you can send the actual content of myFile.json as the request body to your target URL. Your current code has a few critical issues we need to fix first:

• Your payload string has a syntax error (unclosed quotes) and doesn't actually read the content of myFile.json — it just references the filename
• The target URL has a typo: publis should be publish
• You're using APPLICATION_FORM_URLENCODED content type, but we need APPLICATION_JSON since we're sending JSON data
• No logic to read the local JSON file into the request body

Here's the corrected code that addresses all these issues:

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClientBuilder;
import java.nio.file.Files;
import java.nio.file.Paths;

public class HttpClientExample {
    public static void main(String[] args) throws Exception {
        // Read the content of myFile.json into a string
        String jsonContent = new String(Files.readAllBytes(Paths.get("myFile.json")));
        
        // Create a request entity with JSON content type
        StringEntity entity = new StringEntity(jsonContent, ContentType.APPLICATION_JSON);
        
        // Initialize HttpClient and fix the target URL typo
        HttpClient httpClient = HttpClientBuilder.create().build();
        HttpPost request = new HttpPost("http://1.1.1.7:80/myService/publish");
        
        // Attach the JSON entity to the POST request
        request.setEntity(entity);
        
        // Execute the request and print the status code
        HttpResponse response = httpClient.execute(request);
        System.out.println("Response Status Code: " + response.getStatusLine().getStatusCode());
    }
}

Key Details to Note: #

• Reading the JSON File: Files.readAllBytes(Paths.get("myFile.json")) reads the raw bytes of your JSON file and converts them to a string. If your file isn't in the project root directory, use a full absolute path (e.g., Paths.get("C:/Users/YourName/Documents/myFile.json") on Windows or /home/yourname/files/myFile.json on Linux/macOS).
• Content Type: Using ContentType.APPLICATION_JSON tells the server exactly what kind of data we're sending, which is required for most JSON-based APIs to parse the request correctly.
• Dependency Check: Make sure your project includes the Apache HttpClient library. If you're using Maven, add this to your pom.xml:

  <dependency>
      <groupId>org.apache.httpcomponents</groupId>
      <artifactId>httpclient</artifactId>
      <version>4.5.14</version> <!-- Use the latest stable version available -->
  </dependency>
  

• Error Handling: In a production environment, avoid using throws Exception directly. Instead, catch specific exceptions like IOException (for file reading issues) and ClientProtocolException (for HTTP request problems) to handle errors gracefully.

内容的提问来源于stack exchange，提问作者Spartacus