jmeter除了可以做http测试，还支持tcp长连接

图中的Ramp-Up Period需要注意，它表示启动所有线程花费的时间，如图所示，设置为40秒，jmeter会自动计算每秒应该启动多少个线程。

设置thinktime，即每个客户端两次请求之间的时间间隔

发送tcp请求，注意End of line，如果不设置，jmeter会一直读取流，最后认为请求失败，response code 500，所有的结果都会被标记为错误。10是byte值，代表换行，即 \n

自定义响应是否正确，比较字节数会高效一些

显示每个断言的结果，如果断言为false，会显示错误原因，一般用于debug

显示所有请求记录，可以查看响应，便于排查错误

最后是测试报告

/*

* Licensed to the Apache Software Foundation (ASF) under one or more

* contributor license agreements. See the NOTICE file distributed with

* this work for additional information regarding copyright ownership.

* The ASF licenses this file to You under the Apache License, Version 2.0

* (the "License"); you may not use this file except in compliance with

* the License. You may obtain a copy of the License at

*

* http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

*

*/

/*

* TCP Sampler Client implementation which reads and writes binary data.

*

* Input/Output strings are passed as hex-encoded binary strings.

*

*/

package org.apache.jmeter.protocol.tcp.sampler;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.InterruptedIOException;

import java.io.OutputStream;

import java.net.SocketTimeoutException;

import org.apache.commons.io.IOUtils;

import org.apache.jmeter.util.JMeterUtils;

import org.apache.jorphan.logging.LoggingManager;

import org.apache.jorphan.util.JOrphanUtils;

import org.apache.log.Logger;

/**

* TCPClient implementation.

* Reads data until the defined EOM byte is reached.

* If there is no EOM byte defined, then reads until

* the end of the stream is reached.

* The EOM byte is defined by the property "tcp.BinaryTCPClient.eomByte".

*

* Input data is assumed to be in hex, and is converted to binary

*/

public class BinaryTCPClientImpl extends AbstractTCPClient {

private static final Logger log = LoggingManager.getLoggerForClass();

private static final int eomInt = JMeterUtils.getPropDefault("tcp.BinaryTCPClient.eomByte", 1000); // $NON_NLS-1$

public BinaryTCPClientImpl() {

super();

setEolByte(eomInt);

if (useEolByte) {

log.info("Using eomByte=" + eolByte);

}

}

/**

* Convert hex string to binary byte array.

*

* @param hexEncodedBinary - hex-encoded binary string

* @return Byte array containing binary representation of input hex-encoded string

* @throws IllegalArgumentException if string is not an even number of hex digits

*/

public static final byte[] hexStringToByteArray(String hexEncodedBinary) {

if (hexEncodedBinary.length() % 2 == 0) {

char[] sc = hexEncodedBinary.toCharArray();

byte[] ba = new byte[sc.length / 2];

for (int i = 0; i < ba.length; i++) {

int nibble0 = Character.digit(sc[i * 2], 16);

int nibble1 = Character.digit(sc[i * 2 + 1], 16);

if (nibble0 == -1 || nibble1 == -1){

throw new IllegalArgumentException(

"Hex-encoded binary string contains an invalid hex digit in '"+sc[i * 2]+sc[i * 2 + 1]+"'");

}

ba[i] = (byte) ((nibble0 << 4) | (nibble1));

}

return ba;

} else {

throw new IllegalArgumentException(

"Hex-encoded binary string contains an uneven no. of digits");

}

}

/**

* Input (hex) string is converted to binary and written to the output stream.

* @param os output stream

* @param hexEncodedBinary hex-encoded binary

*/

public void write(OutputStream os, String hexEncodedBinary) {

try {

os.write(hexStringToByteArray(hexEncodedBinary));

os.flush();

} catch (IOException e) {

log.warn("Write error", e);

}

log.debug("Wrote: " + hexEncodedBinary);

return;

}

/**

* {@inheritDoc}

*/

public void write(OutputStream os, InputStream is) {

throw new UnsupportedOperationException(

"Method not supported for Length-Prefixed data.");

}

/**

* Reads data until the defined EOM byte is reached.

* If there is no EOM byte defined, then reads until

* the end of the stream is reached.

* Response data is converted to hex-encoded binary

* @return hex-encoded binary string

*/

public String read(InputStream is) {

byte[] buffer = new byte[4096];

ByteArrayOutputStream w = new ByteArrayOutputStream();

int x = 0;

try {

while ((x = is.read(buffer)) > -1) {

w.write(buffer, 0, x);

if (useEolByte && (buffer[x - 1] == eolByte)) {

break;

}

}

} catch (SocketTimeoutException e) {

// drop out to handle buffer

} catch (InterruptedIOException e) {

// drop out to handle buffer

} catch (IOException e) {

log.warn("Read error:" + e);

return "";

}

IOUtils.closeQuietly(w); // For completeness

final String hexString = JOrphanUtils.baToHexString(w.toByteArray());

log.debug("Read: " + w.size() + "\n" + hexString);

return hexString;

}

}

https://my.oschina.net/enyo/blog/833279

https://blog.csdn.net/ccfeng2008/article/details/50375100