feat(Go-StudyExample): 添加CloneExample,测试go语言的对象内存和深度克隆的实现关于对象克隆可参考文章[知乎-](https://zhuanlan.zhihu.com/p/59125443)、[知乎-](https://zhuanlan.zhihu.com/p/58065429)

2020-05-15 09:59:13 +08:00
parent 4feb1f61f2
commit dbda09379d
5 changed files with 213 additions and 1 deletions
@@ -19,4 +19,7 @@ func main() {
 	//--------------------------测试json包的转换功能
 	example.JsonMarshalTest()
 	example.JsonUnmarshalTest()
+
+	example.TestClone()
+
 }
@@ -0,0 +1,20 @@
+/*
+ *  @Author : huangzj
+ *  @Time : 2020/5/15 9:54
+ *  @Description：
+ */
+
+package entity
+
+type SynthesisRuleCmp struct {
+	*SynthesisRule
+	RemainingSynthesisTime int
+	Sort                   int
+}
+
+type SynthesisRule struct {
+	SynthesisId    string  `json:"SynthesisId"`
+	SynthesisNum   int     `json:"SynthesisNum"`
+	CostItems      [][]int `json:"CostItems"`
+	SynthesisItems [][]int `json:"SynthesisItems"`
+}
@@ -0,0 +1,147 @@
+/*
+ *  @Author : huangzj
+ *  @Time : 2020/5/13 17:52
+ *  @Description：测试深拷贝和浅拷贝的代码类
+ */
+
+package example
+
+import (
+	"Go-StudyExample/entity"
+	"Go-StudyExample/util"
+	"fmt"
+)
+
+func TestClone() {
+	fmt.Print("\n\n\n")
+	fmt.Print(" Go语言深克隆的测试：\n\n")
+
+	testJustBasicType()
+
+	testHasPointType()
+
+	fmt.Println("由此可见其实Go语言对于内存的分配，相对对象是独一份，对于对象的基本类型和值类型（结构体），应该是在其内部开辟了内存空间进行存储，而对于" +
+		"指针类型来说，直接使用它的地址（指针），不对结构体进行复制")
+	fmt.Println("")
+
+	testDeepCloneByEncode()
+
+	testDeepCloneByJsonPackage()
+
+}
+
+func testDeepCloneByJsonPackage() {
+	rule := entity.SynthesisRule{
+		SynthesisId:    "112",
+		SynthesisNum:   0,
+		CostItems:      nil,
+		SynthesisItems: nil,
+	}
+	//这边必须是指定的类型，不然没办法转回去
+	rule1, err := util.DeepCopyByJson(rule)
+	if err == nil && rule1 != &rule {
+		fmt.Println("")
+		fmt.Println("通过json包的方式可以实现深度克隆")
+	}
+}
+
+func testDeepCloneByEncode() {
+	rule := entity.SynthesisRule{
+		SynthesisId:    "112",
+		SynthesisNum:   0,
+		CostItems:      nil,
+		SynthesisItems: nil,
+	}
+	rule1 := new(entity.SynthesisRule)
+	err := util.DeepCopyByGob(rule1, rule)
+	if err != nil {
+		panic(err)
+	}
+	rule1.SynthesisId = "123"
+	if rule1 != &rule {
+		fmt.Println("通过序列化的方式可以实现深度克隆")
+	}
+}
+
+func testJustBasicType() {
+	rule := entity.SynthesisRule{
+		SynthesisId:    "112",
+		SynthesisNum:   0,
+		CostItems:      nil,
+		SynthesisItems: nil,
+	}
+	rule1 := rule
+	rule.SynthesisId = "222"
+	rule.SynthesisItems = make([][]int, 0)
+	rule.SynthesisItems = append(rule.SynthesisItems, []int{1})
+
+	if &rule1 != &rule {
+		fmt.Println("结构体中不存在指针，直接用 = 是")
+		fmt.Println("深克隆")
+		fmt.Println("")
+	}
+
+}
+
+func testHasPointType() {
+	cmp := entity.SynthesisRuleCmp{
+		SynthesisRule: &entity.SynthesisRule{
+			SynthesisId:    "112",
+			SynthesisNum:   0,
+			CostItems:      nil,
+			SynthesisItems: nil,
+		},
+		RemainingSynthesisTime: 0,
+		Sort:                   0,
+	}
+
+	cmp1 := cmp
+	cmp.SynthesisId = "123"
+	if &cmp != &cmp1 && cmp.SynthesisRule == cmp1.SynthesisRule {
+		fmt.Println("结构体中存在指针，直接用 = 是深克隆")
+		fmt.Println("但是对于结构体中的指针来说是浅克隆,直接使用地址")
+		fmt.Println("")
+	}
+}
+
+func testHasPointTypeList() {
+
+	cmp := entity.SynthesisRuleCmp{
+		SynthesisRule: &entity.SynthesisRule{
+			SynthesisId:    "112",
+			SynthesisNum:   0,
+			CostItems:      nil,
+			SynthesisItems: nil,
+		},
+		RemainingSynthesisTime: 0,
+		Sort:                   0,
+	}
+	cmp1 := entity.SynthesisRuleCmp{
+		SynthesisRule: &entity.SynthesisRule{
+			SynthesisId:    "112111",
+			SynthesisNum:   0,
+			CostItems:      nil,
+			SynthesisItems: nil,
+		},
+		RemainingSynthesisTime: 0,
+		Sort:                   0,
+	}
+	list := make([]entity.SynthesisRuleCmp, 0)
+	list = append(list, cmp1)
+	list = append(list, cmp)
+
+	list1 := make([]entity.SynthesisRuleCmp, len(list))
+	cmp.RemainingSynthesisTime = 1000
+	fmt.Println(cmp1.RemainingSynthesisTime)
+	copy(list1, list)
+	list1[0].SynthesisId = "12333"
+	if list[0].SynthesisId == list1[0].SynthesisId {
+		fmt.Println("非深度克隆")
+	}
+
+	list2 := list[0:]
+	list2[0].SynthesisId = "54323"
+	if list[0].SynthesisId == list2[0].SynthesisId {
+		fmt.Println("非深度克隆")
+	}
+}
@@ -2,4 +2,7 @@

 2020/4/27 ：创建项目，添加使用示例如下：
 map与struct之间转换的处理工具使用示例，参考代码地址：https://github.com/mitchellh/mapstructure
-json与struct之间转换处理工具使用示例
+json与struct之间转换处理工具使用示例
+
+
+2020/5/15 : 添加CloneExample,测试go语言的对象内存和深度克隆的实现关于对象克隆可参考文章[知乎-](https://zhuanlan.zhihu.com/p/59125443)、[知乎-](https://zhuanlan.zhihu.com/p/58065429)
@@ -0,0 +1,39 @@
+/*
+ *  @Author : huangzj
+ *  @Time : 2020/5/14 17:53
+ *  @Description：
+ */
+
+package util
+
+import (
+	"Go-StudyExample/entity"
+	"bytes"
+	"encoding/gob"
+	"encoding/json"
+)
+
+/*
+ * @param dst 目标对象
+ * @param src 源对象
+ * 通过序列化的方式进行克隆
+ */
+func DeepCopyByGob(dst, src interface{}) error {
+	var buffer bytes.Buffer
+	if err := gob.NewEncoder(&buffer).Encode(src); err != nil {
+		return err
+	}
+
+	return gob.NewDecoder(&buffer).Decode(dst)
+}
+
+func DeepCopyByJson(src interface{}) (*entity.SynthesisRule, error) {
+	var dst = new(entity.SynthesisRule)
+	b, err := json.Marshal(src)
+	if err != nil {
+		return nil, err
+	}
+
+	err = json.Unmarshal(b, dst)
+	return dst, err
+}