1.项目地址

https://github.com/json-path/JsonPath

2.在线测试

看网址像是官方的，可以在线测试表达式，还是蛮好使的

http://jsonpath.com/

3.文档

https://goessner.net/

gradle依赖

// https://mvnrepository.com/artifact/com.jayway.jsonpath/json-path
compile group: 'com.jayway.jsonpath', name: 'json-path', version: '2.4.0'

操作符

运算符

4.用例

使用JsonPath修改Json数据

{
    "apis":[
        {
            "ctime":"2018-11-08 16:01:16",
            "mtime":"2019-02-20 22:11:42",
            "modifierId":1,
            "creatorId":1,
            "apiId":"1",
            "authType":"none",
            "version":"v3",
            "path": "/test",
            "httpMethod":"POST",
            "serviceCode":"resource",
            "cateCode":"server-task",
            "mappingProtocol":"DUBBO",
            "modifyVersion":1,
            "onlineVersion":1,
            "isOnline":"Y",
            "isCached":"N",
            "cachedTime":10000,
            "requestMode":"MAPPING",
            "servCreatorId":1134,
            "requestMappingParam":{
                "requestParams":[
                    {
                        "name":"tenantId",
                        "type":"Long",
                        "paramLocation":"Query",
                        "isRequired":true,
                        "defaultValue":""
                    },
                    {
                        "name":"userId",
                        "type":"Long",
                        "paramLocation":"Query",
                        "isRequired":true,
                        "defaultValue":""
                    },
                    {
                        "name":"taskId",
                        "type":"Long",
                        "paramLocation":"Query",
                        "isRequired":false,
                        "description":"ID"
                    },
                    {
                        "name":"taskName",
                        "type":"String",
                        "paramLocation":"Query",
                        "isRequired":true,
                        "defaultValue":"",
                        "description":"名称"
                    }
                ]
            }
            "dubboParamMappings": {
                "leafParamMappings": [
                    {
                        "paramName":"tenantId",
                        "paramType":"java.lang.Long",
                        "paramMapping":"tenantId"
            	    }
                ]
            }
        }
    ]
}

apis是个列表，列表包含很多map集合。

每个map代表一个api，api中包含requestParams。

其中需要将requestParams中tenantId和userId参数加上headerMapping。

"requestParams":[
{
    "name":"tenantId",
    "type":"Long",
    "paramLocation":"Query",
    "isRequired":true,
    "defaultValue":"",
    "headerMapping":"X-Access-TenantId" // 需要添加的东西
},
{
    "name":"userId",
    "type":"Long",
    "paramLocation":"Query",
    "isRequired":true,
    "defaultValue":"",
    "headerMapping":"X-Access-UserId" // 需要添加的东西
},

首先，读取json文件：

InputStream inputStream = Files.newInputStream(Paths.get("/Users/admin/Downloads/resource.json"));

构造整个文档

DocumentContext document = JsonPath.parse(inputStream);

在指定位置添加key value

(1)$.apis[*]是获取所有apis，这里其实只有一个。。。

(2)$.apis[*].requestMappingParam是获取apis列表中每个map的requestMappingParam

(3)$.apis[*].requestMappingParam.requestParams是获取上一步requestMappingParam中的requestParams

(4)[?(@.name==“tenantId”&&!@.headerMapping)]这个是过滤条件，指的是requestParams中包含name且等于tenantId并且requestParams没有headerMapping这个key

document.put("$.apis[*].requestMappingParam.requestParams[?(@.name==\"tenantId\"&&!@.headerMapping)]", "headerMapping", "X-Access-TenantId");
document.put("$.apis[*].requestMappingParam.requestParams[?(@.name==\"userId\"&&!@.headerMapping)]", "headerMapping", "X-Access-UserId");

(5)后面两个参数分别是key和value

写入修改后的json

Files.write(Paths.get("/tmp/resource.json")), context.jsonString().getBytes());

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