json解析神器 jsonpath的使用
转载：http://blog.csdn.net/qq_20641565/article/details/77162868
如果项目需求是从某些复杂的json里面取值进行计算,用jsonpath+IK(ik-expression)来处理十分方便,jsonpath用来取json里面的值然后用IK自带的函数进行计算,如果是特殊的计算那就自定义IK方法搞定,配置化很方便.
下面简单介绍下jsonpath的使用方法,主要测试都在JsonPathDemo类里面:
下面是一个简单的Java项目demo:
注意: 其中他的max,min,avg,stddev函数只能类似于如下处理:
//正确写法 但是感觉很鸡肋
context.read("$.avg($.result.records[0].loan_type,$.result.records[1].loan_type,$.result.records[2].loan_type)");- 1
- 2
- 1
- 2
不能传入list 感觉比较鸡肋,如果传入list 他会报错(如下错误写法):
//这样会报错
Object maxV = context.read("$.max($.result.records[*].loan_type)");
//这样也会报错
Object maxV = context.read("$.result.records[*].loan_type.max()");
//如果json文件中是这样:"loan_type":"2",也会报错,"loan_type":2 这样才被认为是数字- 1
- 2
- 3
- 4
- 5
- 1
- 2
- 3
- 4
- 5
报错信息都一样,如下:
Exception in thread "main" com.jayway.jsonpath.JsonPathException: Aggregation function attempted to calculate value using empty array- 1
- 1
JsonPathDemo是一个测试demo:
public class JsonPathDemo {
public static void main(String[] args) {
String json = FileUtils.readFileByLines("demo.json");
ReadContext context = JsonPath.parse(json);
//1 返回所有name
List<String> names = context.read("$.result.records[*].name");
//["张三","李四","王五"]
System.out.println(names);
//2 返回所有数组的值
List<Map<String, String>> objs = context.read("$.result.records[*]");
//[{"name":"张三","pid":"500234199212121212","mobile":"18623456789","applied_at":"3","confirmed_at":"5","confirm_type":"overdue","loan_type":"1","test":"mytest","all":"2"},{"name":"李四","pid":"500234199299999999","mobile":"13098765432","applied_at":"1","confirmed_at":"","confirm_type":"overdue","loan_type":"3","all":"3"},{"name":"王五","pid":"50023415464654659","mobile":"1706454894","applied_at":"-1","confirmed_at":"","confirm_type":"overdue","loan_type":"3"}]
System.out.println(objs);
//3 返回第一个的name
String name0 = context.read("$.result.records[0].name");
//张三
System.out.println(name0);
//4 返回下标为0 和 2 的数组值
List<String> name0and2 = context.read("$.result.records[0,2].name");
//["张三","王五"]
System.out.println(name0and2);
//5 返回下标为0 到 下标为1的 的数组值 这里[0:2] 表示包含0 但是 不包含2
List<String> name0to2 = context.read("$.result.records[0:2].name");
//["张三","李四"]
System.out.println(name0to2);
//6 返回数组的最后两个值
List<String> lastTwoName = context.read("$.result.records[-2:].name");
//["李四","王五"]
System.out.println(lastTwoName);
//7 返回下标为1之后的所有数组值 包含下标为1的
List<String> nameFromOne = context.read("$.result.records[1:].name");
//["李四","王五"]
System.out.println(nameFromOne);
//8 返回下标为3之前的所有数组值 不包含下标为3的
List<String> nameEndTwo = context.read("$.result.records[:3].name");
//["张三","李四","王五"]
System.out.println(nameEndTwo);
//9 返回applied_at大于等于2的值
List<Map<String, String>> records = context.read("$.result.records[?(@.applied_at >= '2')]");
//[{"name":"张三","pid":"500234199212121212","mobile":"18623456789","applied_at":"3","confirmed_at":"5","confirm_type":"overdue","loan_type":"1","test":"mytest","all":"2"}]
System.out.println(records);
//10 返回name等于李四的值
List<Map<String, String>> records0 = context.read("$.result.records[?(@.name == '李四')]");
//[{"name":"李四","pid":"500234199299999999","mobile":"13098765432","applied_at":"1","confirmed_at":"","confirm_type":"overdue","loan_type":"3"}]
System.out.println(records0);
//11 返回有test属性的数组
List<Map<String, String>> records1 = context.read("$.result.records[?(@.test)]");
//[{"name":"张三","pid":"500234199212121212","mobile":"18623456789","applied_at":"3","confirmed_at":"5","confirm_type":"overdue","loan_type":"1","test":"mytest","all":"2"}]
System.out.println(records1);
//12 返回有test属性的数组
List<String> list = context.read("$..all");
//["1","4","2","3"]
System.out.println(list);
//12 以当前json的某个值为条件查询 这里ok为1 取出records数组中applied_at等于1的数组
List<String> ok = context.read("$.result.records[?(@.applied_at == $['ok'])]");
//["1","4","2","3"]
System.out.println(ok);
//13 正则匹配
List<String> regexName = context.read("$.result.records[?(@.pid =~ /.*999/i)]");
//[{"name":"李四","pid":"500234199299999999","mobile":"13098765432","applied_at":"1","confirmed_at":"","confirm_type":"overdue","loan_type":"3","all":"3"}]
System.out.println(regexName);
//14 多条件
List<String> mobile = context.read("$.result.records[?(@.all == '2' || @.name == '李四' )].mobile");
//["18623456789","13098765432"]
System.out.println(mobile);
//14 查询数组长度
Integer length01 = context.read("$.result.records.length()");
//3
System.out.println(length01);
//15 查询list里面每个对象长度
List<Integer> length02 = context.read("$.result.records[?(@.all == '2' || @.name == '李四' )].length()");
//[9,8]
System.out.println(length02);
//16 最大值
Object maxV = context.read("$.max($.result.records[0].loan_type,$.result.records[1].loan_type,$.result.records[2].loan_type)");
//3.0
System.out.println(maxV);
//17 最小值
Object minV = context.read("$.min($.result.records[0].loan_type,$.result.records[1].loan_type,$.result.records[2].loan_type)");
//1.0
System.out.println(minV);
//18 平均值
double avgV = context.read("$.avg($.result.records[0].loan_type,$.result.records[1].loan_type,$.result.records[2].loan_type)");
//2.3333333333333335
System.out.println(avgV);
//19 标准差
double stddevV = context.read("$.stddev($.result.records[0].loan_type,$.result.records[1].loan_type,$.result.records[2].loan_type)");
//0.9428090415820636
System.out.println(stddevV);
//20 读取一个不存在的
String haha = context.read("$.result.haha");
//抛出异常
//Exception in thread "main" com.jayway.jsonpath.PathNotFoundException: No results for path: $['result']['haha']
//at com.jayway.jsonpath.internal.path.EvaluationContextImpl.getValue(EvaluationContextImpl.java:133)
//at com.jayway.jsonpath.JsonPath.read(JsonPath.java:187)
//at com.jayway.jsonpath.internal.JsonContext.read(JsonContext.java:102)
//at com.jayway.jsonpath.internal.JsonContext.read(JsonContext.java:89)
//at cn.lijie.jsonpath.JsonPathDemo.main(JsonPathDemo.java:58)
//at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
//at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
//at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
//at java.lang.reflect.Method.invoke(Method.java:498)
//at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
System.out.println(haha);
}
}- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 32
- 33
- 34
- 35
- 36
- 37
- 38
- 39
- 40
- 41
- 42
- 43
- 44
- 45
- 46
- 47
- 48
- 49
- 50
- 51
- 52
- 53
- 54
- 55
- 56
- 57
- 58
- 59
- 60
- 61
- 62
- 63
- 64
- 65
- 66
- 67
- 68
- 69
- 70
- 71
- 72
- 73
- 74
- 75
- 76
- 77
- 78
- 79
- 80
- 81
- 82
- 83
- 84
- 85
- 86
- 87
- 88
- 89
- 90
- 91
- 92
- 93
- 94
- 95
- 96
- 97
- 98
- 99
- 100
- 101
- 102
- 103
- 104
- 105
- 106
- 107
- 108
- 109
- 110
- 111
- 112
- 113
- 114
- 115
- 116
- 117
- 118
- 119
- 120
- 121
- 122
- 123
- 124
- 125
- 126
- 127
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 32
- 33
- 34
- 35
- 36
- 37
- 38
- 39
- 40
- 41
- 42
- 43
- 44
- 45
- 46
- 47
- 48
- 49
- 50
- 51
- 52
- 53
- 54
- 55
- 56
- 57
- 58
- 59
- 60
- 61
- 62
- 63
- 64
- 65
- 66
- 67
- 68
- 69
- 70
- 71
- 72
- 73
- 74
- 75
- 76
- 77
- 78
- 79
- 80
- 81
- 82
- 83
- 84
- 85
- 86
- 87
- 88
- 89
- 90
- 91
- 92
- 93
- 94
- 95
- 96
- 97
- 98
- 99
- 100
- 101
- 102
- 103
- 104
- 105
- 106
- 107
- 108
- 109
- 110
- 111
- 112
- 113
- 114
- 115
- 116
- 117
- 118
- 119
- 120
- 121
- 122
- 123
- 124
- 125
- 126
- 127
pom文件引入:
<dependency>
<groupId>com.jayway.jsonpath</groupId>
<artifactId>json-path</artifactId>
<version>2.3.0</version>
</dependency>- 1
- 2
- 3
- 4
- 5
- 1
- 2
- 3
- 4
- 5
其中demo.json是一个测试json:
{
"action": "/interface.service/xxx/queryBlackUserData",
"all": "1",
"result": {
"count": 2,
"tenant_count": 2,
"records": [
{
"name": "张三",
"pid": "500234199212121212",
"mobile": "18623456789",
"applied_at": "3",
"confirmed_at": "5",
"confirm_type": "overdue",
"loan_type": 1,
"test": "mytest",
"all": "2"
},
{
"name": "李四",
"pid": "500234199299999999",
"mobile": "13098765432",
"applied_at": "1",
"confirmed_at": "",
"confirm_type": "overdue",
"loan_type": 3,
"all": "3"
},
{
"name": "王五",
"pid": "50023415464654659",
"mobile": "1706454894",
"applied_at": "-1",
"confirmed_at": "",
"confirm_type": "overdue",
"loan_type": 3
}
],
"all": "4"
},
"code": 200,
"subtime": "1480495123550",
"status": "success",
"ok": 3
}- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 32
- 33
- 34
- 35
- 36
- 37
- 38
- 39
- 40
- 41
- 42
- 43
- 44
- 45
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 32
- 33
- 34
- 35
- 36
- 37
- 38
- 39
- 40
- 41
- 42
- 43
- 44
- 45
FileUtils类是用于读取xx.json文件为字符串的json:
public class FileUtils {
/**
* 以行为单位读取文件，常用于读面向行的格式化文件
*/
public static String readFileByLines(String fileName) {
File file = new File(fileName);
BufferedReader reader = null;
String str = "";
try {
InputStream is = FileUtils.class.getClassLoader().getResourceAsStream(fileName);
reader = new BufferedReader(new InputStreamReader(is));
String tempString = null;
int line = 1;
// 一次读入一行，直到读入null为文件结束
while ((tempString = reader.readLine()) != null) {
// 显示行号
str += tempString;
}
reader.close();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e1) {
}
}
}
return str;
}
}json解析神器 jsonpath的使用的更多相关文章
- python接口自动化--json解析神器jsonpath
前言 做接口测试的时候,大部分情况下返回的是json数据,我们需要对返回的json断言. 当返回的数据量比较大,并且嵌套的层级很深的时候,很多小伙伴不会取值,往往在返回结果取值上浪费很多时间.一直在寻 ...
- JQ：命令行 json 解析神器 —— 命令行的Jsonview
- Json解析工具的选择
前言 前段时间@寒江不钓同学针对国内Top500和Google Play Top200 Android应用做了全面的分析(具体分析报告见文末的参考资料),其中有涉及到对主流应用使用json框架Gson ...
- JSON解析工具比较，主要GSON和FastJSON
JSON解析工具比较,主要GSON和FastJSON 一 .各个JSON技术的简介和优劣 1.json-lib json-lib最开始的也是应用最广泛的json解析工具,json-lib 不好的地方确 ...
- [转] 各种Json解析工具比较 - json-lib/Jackson/Gson/FastJson
JSON技术的调研报告 一 .各个JSON技术的简介和优劣1.json-libjson-lib最开始的也是应用最广泛的json解析工具,json-lib 不好的地方确实是依赖于很多第三方包,包括com ...
- java中常见的json解析方法、库以及性能对比
常见的json解析有原生的JSONObject和JSONArray方法,谷歌的GSON库,阿里的fastjson,还有jackson,json-lib. Gson(项目地址:https://githu ...
- JAVA自已设计JSON解析器
当然,有很多很好的JSON解析的JAR包,比如JSONOBJECT,GSON,甚至也有为我们测试人员而打造的JSONPATH,但我还是自已实现了一下(之前也实现过,现在属于重构). 思想是这样的,以这 ...
- perl6 JSON::Fast模块json解析的使用
关于JSON: JSON (JavaScript Object Notation)是一种轻量级的数据交换格式,语法简单,各种语言都有相应的库或者模块支持. 因为JSON非常小巧,解析起来又非常简单,我 ...
- Python_实现json数据的jsonPath(精简版)定位及增删改操作
基于python实现json数据的jsonPath(精简版)定位及增删改操作 by:授客 QQ:1033553122 实践环境 win7 64 Python 3.4.0 代码 #-*- encod ...
随机推荐
- python - unittest - 单元测试
# -*- coding:utf-8 -*- '''@project: jiaxy@author: Jimmy@file: study_unittest.py@ide: PyCharm Communi ...
- python学习--Python之import与from...import的区别与用法
Python编码第一步是导入模块,有时候用import ***有时候用from...import,它们有什么区别呢,请看实例A/B: A: 1.当模块test.py中没有类,只有方法add,此方法实现 ...
- csa Round #73 (Div. 2 only)
Three Equal Time limit: 1000 msMemory limit: 256 MB You are given an array AA of NN integers betwe ...
- jQuery 样式操作、文档操作、属性操作的方法总结
文档操作: addClass() 向匹配的元素添加指定的类名.after() 在匹配的元素之后插入内容.append() ...
- Oracle PL/SQL 语言（Procedural Language/SQL）
Oracle PL/SQL 语言(Procedural Language/SQL)是结合了结构化查询与 Oracle 自身过程控制为一体的强大语言,PL/SQL 不但支持更多的数据类型,拥有自身的变量 ...
- Linux Shell系列教程之（一）Shell简介
本文是Linux Shell系列教程的第(一)篇,更多shell教程请看:Linux Shell系列教程 想要学习linux,shell知识必不可少,今天就给大家来简单介绍下shell的基本知识. S ...
- IE7下z-index失效问题
看代码: HTML <div class="select-wrap"> <div class="select-name">院系</ ...
- [luoguP1110] [ZJOI2007]报表统计（set暴力）
传送门 两个multiset 一个记录相邻元素的差,一个放所有的元素 2个数组 val[i]记录第i个的值,last[i]记录第i个最后插入的数的值 然后乱搞 #include <set> ...
- UVA11367 Full Tank? 【分层图最短路】
题目 After going through the receipts from your car trip through Europe this summer, you realised that ...
- python解析yaml文件
YAML语法规则: http://www.ibm.com/developerworks/cn/xml/x-cn-yamlintro/ 下载PyYAML: http://www.yaml.org/ 解压 ...