feat(Go-StudyExample):2020/12/16: 新增gjson的使用示例

2020-12-16 11:04:22 +08:00
parent ffc204a28f
commit 1d21a9634e
4 changed files with 192 additions and 0 deletions
@@ -0,0 +1,186 @@
+/*
+ *  @Author : huangzj
+ *  @Time : 2020/12/16 10:33
+ *  @Description：
+ */
+
+package gJson
+
+import (
+	"fmt"
+	"strings"
+	"testing"
+)
+import "github.com/tidwall/gjson"
+
+//获取json中的某一个键的值
+func TestCommonOperation(t *testing.T) {
+	json := `{"name":{"first":"www.topgoer.com","last":"dj"},"age":18}`
+	lastName := gjson.Get(json, "name.last")
+	fmt.Println("last name:", lastName.String())
+
+	age := gjson.Get(json, "age")
+	fmt.Println("age:", age.Int())
+}
+
+//检验json字符串是否合法
+func TestValid(t *testing.T) {
+	var json = `{"name":dj,age:18}`
+	if !gjson.Valid(json) {
+		fmt.Println("error")
+	} else {
+		fmt.Println("ok")
+	}
+}
+
+//测试一次性获取json的多个键值
+func TestGetMany(t *testing.T) {
+	var json = `
+		{
+		  "name":"dj",
+		  "age":18,
+		  "pets": ["cat", "dog"],
+		  "contact": {
+			"phone": "123456789",
+			"email": "dj@example.com"
+		  }
+	}`
+
+	// .#表示数组长度
+	results := gjson.GetMany(json, "name", "age", "pets.#", "contact.phone")
+	for _, result := range results {
+		fmt.Println(result)
+	}
+}
+
+//测试遍历 Json的数组元素或者结构体所有字段
+func TestTraverse(t *testing.T) {
+	var json = `
+	{
+	  "name":"dj",
+	  "age":18,
+	  "pets": ["cat", "dog"],
+	  "contact": {
+		"phone": "123456789",
+		"email": "dj@example.com"
+	  }
+	}`
+
+	pets := gjson.Get(json, "pets")
+	pets.ForEach(func(_, pet gjson.Result) bool {
+		fmt.Println(pet)
+		return true
+	})
+
+	contact := gjson.Get(json, "contact")
+	contact.ForEach(func(key, value gjson.Result) bool {
+		fmt.Println(key, value)
+		return true
+	})
+}
+
+// 测试gjson中修饰符的作用
+// @reverse：翻转一个数组；
+// @ugly：移除 JSON 中的所有空白符；
+// @pretty：使 JSON 更易用阅读；
+// @this：返回当前的元素，可以用来返回根元素；
+// @valid：校验 JSON 的合法性；
+// @flatten：数组平坦化，即将["a", ["b", "c"]]转为["a","b","c"]；
+// @join：将多个对象合并到一个对象中。
+func TestModifier(t *testing.T) {
+	var json = `{
+	  "name":{"first":"Tom", "last": "Anderson"},
+	  "age": 37,
+	  "children": ["Sara", "Alex", "Jack"],
+	  "fav.movie": "Dear Hunter",
+	  "friends": [
+		{"first": "Dale", "last":"Murphy", "age": 44, "nets": ["ig", "fb", "tw"]},
+		{"first": "Roger", "last": "Craig", "age": 68, "nets": ["fb", "tw"]},
+		{"first": "Jane", "last": "Murphy", "age": 47, "nets": ["ig", "tw"]}
+	  ]
+	}`
+
+	fmt.Println(gjson.Get(json, "children|@reverse"))
+	fmt.Println(gjson.Get(json, "children|@reverse|0"))
+	fmt.Println(gjson.Get(json, "friends|@ugly"))
+	fmt.Println(gjson.Get(json, "friends|@pretty"))
+	fmt.Println(gjson.Get(json, "@this"))
+
+	nestedJSON := `{"nested": ["one", "two", ["three", "four"]]}`
+	fmt.Println(gjson.Get(nestedJSON, "nested|@flatten"))
+
+	userJSON := `{"info":[{"name":"dj", "age":18},{"phone":"123456789","email":"dj@example.com"}]}`
+	fmt.Println(gjson.Get(userJSON, "info|@join"))
+}
+
+//测试自定义修饰符
+func TestDiyModifier(t *testing.T) {
+	gjson.AddModifier("case", diyModifierCaseFunc)
+
+	const json = `{"children": ["Sara", "Alex", "Jack"]}`
+	fmt.Println(gjson.Get(json, "children|@case:upper"))
+	fmt.Println(gjson.Get(json, "children|@case:lower"))
+}
+
+//json: 对应的字符串内容
+//arg:  标签后面的内容
+func diyModifierCaseFunc(json, arg string) string {
+	if arg == "upper" {
+		return strings.ToUpper(json)
+	}
+
+	if arg == "lower" {
+		return strings.ToLower(json)
+	}
+
+	return json
+}
+
+// 测试键路径，有点类似通配符的标识
+// children.#：返回数组children的长度；
+// children.1：读取数组children的第 2 个元素（注意索引从 0 开始）；
+// child*.2：首先child*匹配children，.2读取第 3 个元素；
+// c?ildren.0：c?ildren匹配到children，.0读取第一个元素；
+// fav.\moive：因为键名中含有.，故需要\转义；
+// friends.#.first：如果数组后#后还有内容，则以后面的路径读取数组中的每个元素，返回一个新的数组。所以该查询返回的数组所有friends的first字段组成；
+// friends.1.last：读取friends第 2 个元素的last字段。
+func TestKeyPath(t *testing.T) {
+	var json = `
+	{
+	  "name":{"first":"Tom", "last": "Anderson"},
+	  "age": 37,
+	  "children": ["Sara", "Alex", "Jack"],
+	  "fav.movie": "Dear Hunter",
+	  "friends": [
+		{"first": "Dale", "last":"Murphy", "age": 44, "nets": ["ig", "fb", "tw"]},
+		{"first": "Roger", "last": "Craig", "age": 68, "nets": ["fb", "tw"]},
+		{"first": "Jane", "last": "Murphy", "age": 47, "nets": ["ig", "tw"]}
+	  ]
+	}
+	`
+
+	fmt.Println("last name:", gjson.Get(json, "name.last"))
+	fmt.Println("age:", gjson.Get(json, "age"))
+	fmt.Println("children:", gjson.Get(json, "children"))
+	fmt.Println("children count:", gjson.Get(json, "children.#"))
+	fmt.Println("second child:", gjson.Get(json, "children.1"))
+	fmt.Println("third child*:", gjson.Get(json, "child*.2"))
+	fmt.Println("first c?ild:", gjson.Get(json, "c?ildren.0"))
+	fmt.Println("fav.moive", gjson.Get(json, `fav.\moive`))
+	fmt.Println("first name of friends:", gjson.Get(json, "friends.#.first"))
+	fmt.Println("last name of second friend:", gjson.Get(json, "friends.1.last"))
+}
+
+//遍历json的每一行.这个应该需要的是json是按照正常的格式进行输入的
+func TestEachLine(t *testing.T) {
+	var json = `
+	{"name": "Gilbert", "age": 61}
+	{"name": "Alexa", "age": 34}
+	{"name": "May", "age": 57}
+	{"name": "Deloise", "age": 44}`
+
+	fmt.Println(gjson.Get(json, "..#"))
+	fmt.Println(gjson.Get(json, "..1"))
+	fmt.Println(gjson.Get(json, "..#.name"))
+	fmt.Println(gjson.Get(json, `..#(name="May").age`))
+}
@@ -0,0 +1,4 @@
+获取gjson库命令： go get github.com/tidwall/gjson
+
+参考地址：[http://www.topgoer.com/%E5%85%B6%E4%BB%96/gjson.html](http://www.topgoer.com/%E5%85%B6%E4%BB%96/gjson.html)
+