jmeter读取json文件

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Jmeter之Json提取器详解(史上最全)

实际工作中用到的一些场景：

提取某个特定的值

提取多个值

按条件取值

阵列取值(返回所有元素的列表/数组)

提取多个值

Jsonpath提取器需要另外安装

下载plugins-manager.jar加入其加入JMETER_HOME/lib/ext目录，

重新启动JMeter，

点击Options > Plugins Manager顶部菜单，

选择Available Plugins标签，

选择Json Plugins并双击应用更改并重新启动JMeter。

使用方法：

Json Path提取器应放在HTTP Sampler下。可设置的参数有：

变量名称：分号单独的变量名称，

JSON Path Expressions：从json响应中提取内容的表达式，

匹配数字：-1对于所有，0对于随机的，n对于第n个，

Compute concatenation var：创建一个${foo_ALL}包含所有提取值的串联的变量，

默认值：如果表达式不适用于正在处理的json文档，使用此处给定的默认值。

接下来用一个实际案例来演示Json提取的一些用法：

示例：有如下json

{

"code": 0,

"data": {

"total": 10,

"pageNo": 1,

"pageSize": 100,

"items": [

{

"friendHeadLogoUrl": null,

"msg": "你好，我仰慕你的才华！",

"shield": 0,

"star": 0,

"friendNickname": "Auto",

"origin": 202,

"black": 0,

"memo": null,

"updateTime": 1591169560056,

"type": 2,

"userId": 1268082752079560705,

"friendId": 1267735865761759234,

"createTime": 1591169490879,

"blackUpdateTime": 0,

"addUpdateTime": 1591169560056,

"id": 1268082870707040258,

"close": 0,

"status": 2

},

{

"friendHeadLogoUrl": null,

"msg": "你好，我仰慕你的才华！",

"shield": 0,

"star": 0,

"friendNickname": "Auto",

"origin": 202,

"black": 0,

"memo": null,

"updateTime": 1591169560092,

"type": 2,

"userId": 1268082752079560705,

"friendId": 1267735866185383938,

"createTime": 1591169491390,

"blackUpdateTime": 0,

"addUpdateTime": 1591169560092,

"id": 1268082872854523906,

"close": 0,

"status": 2

},

{

"friendHeadLogoUrl": null,

"msg": "你好，我仰慕你的才华！",

"shield": 0,

"star": 0,

"friendNickname": "Auto",

"origin": 202,

"black": 0,

"memo": null,

"updateTime": 1591169560126,

"type": 2,

"userId": 1268082752079560705,

"friendId": 1267735867363983362,

"createTime": 1591169491862,

"blackUpdateTime": 0,

"addUpdateTime": 1591169560126,

"id": 1268082874830041089,

"close": 0,

"status": 2

},

{

"friendHeadLogoUrl": null,

"msg": "你好，我仰慕你的才华！",

"shield": 0,

"star": 0,

"friendNickname": "Auto",

"origin": 202,

"black": 0,

"memo": null,

"updateTime": 1591169560164,

"type": 2,

"userId": 1268082752079560705,

"friendId": 1267735867825356802,

"createTime": 1591169492296,

"blackUpdateTime": 0,

"addUpdateTime": 1591169560164,

"id": 1268082876654563330,

"close": 0,

"status": 2

},

{

"friendHeadLogoUrl": null,

"msg": "你好，我仰慕你的才华！",

"shield": 0,

"star": 0,

"friendNickname": "Auto",

"origin": 202,

"black": 0,

"memo": null,

"updateTime": 1591169560310,

"type": 2,

"userId": 1268082752079560705,

"friendId": 1267735867003273217,

"createTime": 1591169493876,

"blackUpdateTime": 0,

"addUpdateTime": 1591169560310,

"id": 1268082883277369345,

"close": 0,

"status": 2

},

{

"friendHeadLogoUrl": null,

"msg": "你好，我仰慕你的才华！",

"shield": 0,

"star": 0,

"friendNickname": "Auto",

"origin": 202,

"black": 0,

"memo": null,

"updateTime": 1591169560376,

"type": 2,

"userId": 1268082752079560705,

"friendId": 1267735868571942913,

"createTime": 1591169494629,

"blackUpdateTime": 0,

"addUpdateTime": 1591169560376,

"id": 1268082886439874561,

"close": 0,

"status": 2

}

],

"timestamp": null

},

"codeMsg": "success"

}

1、提取某个特定的值

Jsonpath

结果$.data.total

10

$..total

10

$..items[1].userId

1268082752079560705

2、提取多个值

比如要提取items列表里所有的friendId

$..friendId

$..[*].friendId

$.data.items[*].friendId

三种写法都可以，结果为：

Result[0]=1267735865761759234

Result[1]=1267735866185383938

Result[2]=1267735867363983362

Result[3]=1267735867825356802

Result[4]=1267735864650268673

Result[5]=1267735865363300353

Result[6]=1267735866688700417

Result[7]=1267735867003273217

Result[8]=1267735868232204289

Result[9]=1267735868571942913

注意：

使用时，需要用下标读取，如${friend_id_1}、${friend_id_2}........

特别说明一下，如果想要获取返回元素的数量，可以用${friend_id_matchNr}

也可以使用foreach控制器循环读取，这里不再描述。

3、按条件提取值

有时候只需要提取某个特定条件下的参数，比如现在想要提取创建时间为1591169490879的friendId

$.data.items[?(@.createTime ==1591169490879)].friendId

4、阵列提取

提取任何节点的某个key的值，比如提取friendId

$..friendId

结果为：

friend_all_1=1267735865761759234

friend_all_10=1267735868571942913

friend_all_2=1267735866185383938

friend_all_3=1267735867363983362

friend_all_4=1267735867825356802

friend_all_5=1267735864650268673

friend_all_6=1267735865363300353

friend_all_7=1267735866688700417

friend_all_8=1267735867003273217

friend_all_9=1267735868232204289

friend_all_ALL=1267735865761759234,1267735866185383938,1267735867363983362,1267735867825356802,1267735864650268673,1267735865363300353,1267735866688700417,1267735867003273217,1267735868232204289,1267735868571942913

friend_all_matchNr=10

_ALL下标是将所有元素组成一个list，像后续接口有时候参数是以数组形式来传参，这个函数就很有用，如果需要返回此函数，需要在json提取器中，勾选Compute concatenation var

5、提取多个值

json表达式：

$..['msg','friendId']

返回的变量如下：

two_1={"msg":"你好，我仰慕你的才华！","friendId":1267735865761759234}

two_10={"msg":"你好，我仰慕你的才华！","friendId":1267735868571942913}

two_2={"msg":"你好，我仰慕你的才华！","friendId":1267735866185383938}

two_3={"msg":"你好，我仰慕你的才华！","friendId":1267735867363983362}

two_4={"msg":"你好，我仰慕你的才华！","friendId":1267735867825356802}

two_5={"msg":"你好，我仰慕你的才华！","friendId":1267735864650268673}

two_6={"msg":"你好，我仰慕你的才华！","friendId":1267735865363300353}

two_7={"msg":"你好，我仰慕你的才华！","friendId":1267735866688700417}

two_8={"msg":"你好，我仰慕你的才华！","friendId":1267735867003273217}

two_9={"msg":"你好，我仰慕你的才华！","friendId":1267735868232204289}

two_ALL={"msg":"你好，我仰慕你的才华！","friendId":1267735865761759234},{"msg":"你好，我仰慕你的才华！","friendId":1267735866185383938},{"msg":"你好，我仰慕你的才华！","friendId":1267735867363983362},{"msg":"你好，我仰慕你的才华！","friendId":1267735867825356802},{"msg":"你好，我仰慕你的才华！","friendId":1267735864650268673},{"msg":"你好，我仰慕你的才华！","friendId":1267735865363300353},{"msg":"你好，我仰慕你的才华！","friendId":1267735866688700417},{"msg":"你好，我仰慕你的才华！","friendId":1267735867003273217},{"msg":"你好，我仰慕你的才华！","friendId":1267735868232204289},{"msg":"你好，我仰慕你的才华！","friendId":1267735868571942913}

two_matchNr=10

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