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gjson除了能够灵活解析、检索未知数据结构内容,还能够动态创建和修改数据结构内容。
gjson
j := gjson.New(nil) j.Set("name", "John") j.Set("score", 99.5) fmt.Printf( "Name: %s, Score: %v\n", j.GetString("name"), j.GetFloat32("score"), ) fmt.Println(j.MustToJsonString()) // Output: // Name: John, Score: 99.5 // {"name":"John","score":99.5}
j := gjson.New(nil) for i := 0; i < 5; i++ { j.Set(fmt.Sprintf(`%d.id`, i), i) j.Set(fmt.Sprintf(`%d.name`, i), fmt.Sprintf(`student-%d`, i)) } fmt.Println(j.MustToJsonString()) // Output: // [{"id":0,"name":"student-0"},{"id":1,"name":"student-1"},{"id":2,"name":"student-2"},{"id":3,"name":"student-3"},{"id":4,"name":"student-4"}]
data := `{ "users" : { "count" : 2, "list" : [ {"name" : "Ming", "score" : 60}, {"name" : "John", "score" : 59} ] } }` if j, err := gjson.DecodeToJson(data); err != nil { panic(err) } else { j.Set("users.list.1.score", 100) fmt.Println("John Score:", j.GetFloat32("users.list.1.score")) fmt.Println(j.MustToJsonString()) } // Output: // John Score: 100 // {"users":{"count":2,"list":[{"name":"Ming","score":60},{"name":"John","score":100}]}}
JSON数据通过gjson包读取后,可以通过Set方法改变内部变量的内容,当然也可以新增/删除内容,当需要删除内容时,设定的值为nil即可。gjson包的数据运行时修改特性非常强大,在该特性的支持下,各种数据结构的编码/解析显得异常的灵活方便。
JSON
Set
新增/删除
nil