jmeter 参数值写入到指定的文件中[如获取token写入某文件为免登录备用]

1、编写java 类AppendFile ，代码如下

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;


public class AppendFile {
//将content写入到指定文件fileName中
public static void appendFile(String fileName, String content) throws IOException{
FileWriter writer = null;
try {

writer = new FileWriter(fileName, true);
content = content + " ";
writer.write(content);
} catch(IOException e){
e.printStackTrace();
}finally{
if (writer != null){
writer.close();
}
}

}
//fileName中的内容清空
public static void clearFile(String fileName) throws IOException{
FileWriter writer = null;
try{

writer = new FileWriter(fileName);
writer.write("");
} catch(IOException e){
e.printStackTrace();
}finally{
if (writer != null){
writer.close();
}
}
}

2、将代码打成jar包（Eclipse点击Export打成jar包writeFile）放在jmeter的lib/ext目录下

3、创建一个后置的BeanShell PostProcessor处理器，代码如下：

import writeFile.*;
System.out.println("******写入文件*************");
String filePath = "d://token.txt";
String content = vars.get("token");   //此处的cash就是从sample中获取的变量名,根据实际情况修改。
AppendFile.appendFile(filePath,content);