使用LR编写HTTP协议Json报文格式接口脚本实战

最近在做HTTP协议接口压测时，遇到一些编写脚本方面的问题，在这里总结记录下，以便以后温习，也希望能帮助到和我有同样困惑的朋友吧。

//实战代码如下所示：
Action()
{
   lr_start_transaction("事物");

// 断言内容：processcode":"0000","processdes:"处理成功"

   web_reg_save_param("processcode",
                      "NotFound=warning",
                      "LB=processcode":"",
                      "RB=","processdes",
                      "Ord=1",
                      "Search=Body",
                      LAST);

  web_reg_save_param("processdes",
                  "NotFound=warning",
                  "LB=processdes":"",
                  "RB=","checkresult",
                  "Ord=1",
                  "Search=Body",
                  LAST);

   //接口1：发送指定key:value参数的json报文
    web_submit_data("request",
                   "Action=http://IP:port/sss/idCardCheck11",
                   "Method=POST",
                   "Mode=HTTP",
                   "RecContentType=application/json",
                    ITEMDATA,
                    "Name=msgbody", "Value={"app_sign":"287cca63e9316c031","businesscode":"05"," 
                    ""note":"","brnchcd":"4001","b64pic":"","inputtype":"11","teller":"2666"," 
                    ""idcardno":"139891119211X","name":"user","wthrespic":"1","app_id":null," 
                    ""bankcode":"31100396","timestamp":"1536118078193"}", ENDITEM,
                    LAST);                    
    //接口2：发送json格式报文
    web_custom_request("request",
                  "Url=http://IP:port/sss/idCardCheck11",
                  "Method=POST",
                  "Mode=HTTP",
                  "EncType=application/json",
                  "RecContentType=application/json",
                  "Body={"app_sign":"287cca63e9316c031","businesscode":"05","note":"","brnchcd":"4001"," 
                  ""b64pic":"","inputtype":"11","teller":"2666","idcardno":"139891119211X",""name":" 
                  ""user","wthrespic":"1","app_id":null,"bankcode":"31100396","timestamp":"1536118078193"}",
                   LAST);

     //响应报文key值和预期结果比较，如果等于0则请求处理成功
     if(strcmp(lr_eval_string("{processcode}"),"0000") == 0){
        lr_end_transaction("事物", LR_PASS);

     }else{
        lr_end_transaction("事物", LR_FAIL);
        //事物失败后打印processdes字段的值，也就是错误信息，但是LR打印出来的中文出现乱码，所以这里做了转码的操作
        lr_convert_string_encoding(lr_eval_string("{processdes}"),LR_ENC_UTF8,LR_ENC_SYSTEM_LOCALE,"resultMsg");
        //解码后返回单笔核对请求处理成功
        lr_error_message("错误信息:%s",lr_eval_string("{resultMsg}"));  

    }

  // lr_end_transaction("事物",LR_AUTO);

    return 0;
}

以下是web_submit_data()函数 API示例代码：

从示例可以看到发送的是name,value对，提交表单的形式，但实际Value值也可能存在json数组，xml等形式。

  // web_submit_data() API示例
  web_submit_data("default.aspx",
                "Action=http://lazarus/flightnet/default.aspx",
                "Method=POST",
                "TargetFrame=",
                "RecContentType=text/html",
                "Referer=http://lazarus/flightnet/",
                "Snapshot=t7.inf",
                "Mode=HTML",
                ITEMDATA,
                "Name=grpType", "Value=radRoundtrip", ENDITEM,
                "Name=lstDepartingCity", "Value=DEN", ENDITEM,
                "Name=lstDestinationCity", "Value=LAX", ENDITEM,
                "Name=btnAvailableFlights", "Value=Next >", ENDITEM,
            LAST );

接口请求报文如下：

msgbody:{app_sign:287cca63e9316c031,businesscode:05,note:,brnchcd:4001,b64pic:,inputtype:11,teller:2666,idcardno:139891119211X,name:user,wthrespic:1,app_id:null,bankcode:31100396,timestamp:1536118078193}

问题描述：

往常使用LR编写处理HTTP接口脚本，惯用的函数是web自定义请求函数 web_custom_request（），使用接口测试工具postman请求成功后就直接编写脚本，尝试了几种组body的方法均返回请求方法格式出错或者直接请求失败，尝试请求方法如下所示：

  web_custom_request("request",
                  "Url=http://10.148.0.161:1111/check/idCardCheck",
                  "Method=POST",
                  "Mode=HTTP",
                  "EncType=application/json",
                  "RecContentType=application/json",
                  "Body={msgbody:{"app_sign":"287cca63e9316c031","businesscode":"05","note":"","brnchcd":"4001"," 
                  ""b64pic":"","inputtype":"11","teller":"2666","idcardno":"139891119211X",""name":" 
                  ""user","wthrespic":"1","app_id":null,"bankcode":"31100396","timestamp":"1536118078193"}}",
                   LAST);
      
      web_custom_request("request",
                  "Url=http://10.148.0.161:1111/check/idCardCheck",
                  "Method=POST",
                  "Mode=HTTP",
                  "EncType=application/json",
                  "RecContentType=application/json",
                  "Body={"msgbody":{"app_sign":"287cca63e9316c031","businesscode":"05","note":"","brnchcd":"4001"," 
                  ""b64pic":"","inputtype":"11","teller":"2666","idcardno":"139891119211X",""name":" 
                  ""user","wthrespic":"1","app_id":null,"bankcode":"31100396","timestamp":"1536118078193"}}",
                   LAST);
      
       web_custom_request("request",
                  "Url=http://10.148.0.161:1111/check/idCardCheck",
                  "Method=POST",
                  "Mode=HTTP",
                  "EncType=application/json",
                  "RecContentType=application/json",
                  "Body=msgbody:{"app_sign":"287cca63e9316c031","businesscode":"05","note":"","brnchcd":"4001"," 
                  ""b64pic":"","inputtype":"11","teller":"2666","idcardno":"139891119211X",""name":" 
                  ""user","wthrespic":"1","app_id":null,"bankcode":"31100396","timestamp":"1536118078193"}",
                   LAST);

结论：如果提供的报文是key：value格式的就使用web_submit_data()函数，反之可选择使用web_custom_request（）函数，如以上内容表述或总结后期会不断完善。