jmeter添加自定义扩展函数之if判断

1，打开eclipse,新建maven工程，在pom中引用jmeter核心jar包，具体请看---https://www.cnblogs.com/guanyf/p/10863033.html---，这里就不再赘述
2，代码如下：
  1 package com.mytest.functions;
  2 
  3 
  4 
  5 import org.apache.jmeter.engine.util.CompoundVariable;
  6 
  7 import org.apache.jmeter.functions.AbstractFunction;
  8 
  9 import org.apache.jmeter.functions.InvalidVariableException;
 10 
 11 import org.apache.jmeter.samplers.SampleResult;
 12 
 13 import org.apache.jmeter.samplers.Sampler;
 14 
 15 import org.apache.jmeter.threads.JMeterVariables;
 16 
 17 
 18 
 19 import java.util.Collection;
 20 
 21 import java.util.LinkedList;
 22 
 23 import java.util.List;
 24 
 25 
 26 
 27 public class If extends AbstractFunction {
 28 
 29     private static final List<String> desc = new LinkedList<String>();
 30 
 31     private static final String KEY = "__if";
 32 
 33 
 34 
 35     static {
 36 
 37         desc.add("Actual value");
 38 
 39         desc.add("Expected value");
 40 
 41         desc.add("Result if actual == expected");
 42 
 43         desc.add("Result if actual != expected");
 44 
 45         desc.add("Name of variable in which to store the result (optional)");
 46 
 47     }
 48 
 49 
 50 
 51     private Object[] values;
 52 
 53 
 54 
 55     public If() {
 56 
 57     }
 58 
 59 
 60 
 61     @Override
 62 
 63     public synchronized String execute(SampleResult previousResult, Sampler currentSampler)
 64 
 65             throws InvalidVariableException {
 66 
 67 
 68 
 69         String actual = getParameter(0);
 70 
 71         String expected = getParameter(1);
 72 
 73 
 74 
 75         String result = null;
 76 
 77         if (actual.equals(expected)) {
 78 
 79             result = getParameter(2).toString();
 80 
 81         } else {
 82 
 83             result = getParameter(3).toString();
 84 
 85         }
 86 
 87 
 88 
 89         JMeterVariables vars = getVariables();
 90 
 91         if (vars != null && values.length > 4) {
 92 
 93             String varName = getParameter(4).trim();
 94 
 95             vars.put(varName, result);
 96 
 97         }
 98 
 99 
100 
101         return result;
102 
103     }
104 
105 
106 
107     @Override
108 
109     public synchronized void setParameters(Collection<CompoundVariable> parameters) throws InvalidVariableException {
110 
111         checkMinParameterCount(parameters, 4);
112 
113         values = parameters.toArray();
114 
115     }
116 
117 
118 
119     @Override
120 
121     public String getReferenceKey() {
122 
123         return KEY;
124 
125     }
126 
127 
128 
129     @Override
130 
131     public List<String> getArgumentDesc() {
132 
133         return desc;
134 
135     }
136 
137 
138 
139     private String getParameter(int i) {
140 
141         return ((CompoundVariable) values[i]).execute();
142 
143     }
144 
145 }
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