如何在JMeter中创建TCP/IP API以实现自动化与负载测试？

Here's a step-by-step, practical guide to set up JMeter for sending your JSON payload to the TCP server at 10.10.xx.xxx:4433—perfect for both automation and load testing:

1. Build the Core Test Structure #

• Open JMeter and create a new Test Plan (File > New).
• Right-click the Test Plan > Add > Threads (Users) > Thread Group. Configure this based on your testing goals:
  • Number of Threads (Users): The number of concurrent requests you want to simulate.
  • Ramp-Up Period: Time (in seconds) to spin up all threads (e.g., 10 seconds for 10 users = 1 user per second).
  • Loop Count: How many times each thread will repeat the request (set to "Forever" for continuous load testing).

2. Add and Configure the TCP Sampler #

Right-click your Thread Group > Add > Sampler > TCP Sampler. This is where you’ll define the connection and payload:

Critical TCP Sampler Settings: #

• Server Name or IP: Enter 10.10.xx.xxx (replace the xx with your actual IP segments).
• Port Number: 4433
• Text to send: Paste your full JSON payload here. Important: TCP is a stream protocol, so you must include a delimiter the server recognizes to mark the end of the message. Common options:
  • Append \r\n (carriage return + newline) at the end of your JSON.
  • If the server uses a specific delimiter (like a null byte \0), add that instead (check server docs or use Wireshark to confirm if unsure).
• Re-use connection: Check this box for load testing to keep connections alive between requests—this boosts performance and mimics real-world traffic better.
• SSL: If the TCP server uses SSL/TLS encryption, check this box. For custom keystores, go to Options > SSL Manager to configure credentials first.

3. Add Listeners to Analyze Results #

To validate requests and measure performance:

• Right-click the Thread Group > Add > Listener > View Results Tree: This lets you inspect each request/response in detail (ideal for debugging).
• Add listeners like Summary Report or Aggregate Graph for load testing metrics: throughput, average response time, error rates, etc.

4. Optional: Dynamic Data Handling #

If fields like REQDT (timestamp) need to be dynamic, use JMeter’s built-in functions:

• Replace the static REQDT value with ${__time(ddMMyyyyHHmmss,)} to generate the current timestamp in the format ddMMYYYYHHmmss (matches your example 15052018110916).
• For other dynamic values, use a CSV Data Set Config to read from a file, or a JSR223 PreProcessor to modify the payload programmatically (e.g., using Groovy).

5. Test and Troubleshoot #

• Click the green Run button to execute the test.
• In the View Results Tree:
  • A successful response means your setup works.
  • If you get errors, check these common issues first:
    • Incorrect delimiter (server isn’t detecting the end of the message).
    • SSL not enabled when required.
    • Network connectivity issues to 10.10.xx.xxx:4433.
    • Typos in the JSON payload.

Once validated, you can scale the Thread Group settings to simulate higher load or add more samplers for multi-step scenarios.

内容的提问来源于stack exchange，提问作者Sanjeev Bhasker