db/init.go

+package db
+
+import (
+	"github.com/sirupsen/logrus"
+	"gorm.io/driver/postgres"
+	"gorm.io/gorm"
+)
+
+// DB 全局数据库实例（保持不变）
+var DB *gorm.DB
+
+// InitDB 初始化 PostgreSQL 数据库（修改：返回error类型）
+func InitDB() error { // 关键：添加error返回值
+	// PostgreSQL 连接字符串（替换为你的实际配置）
+	dsn := "host=localhost port=5432 user=go_zyz password=zyz757605 dbname=mygo sslmode=disable client_encoding=utf8"
+	var err error
+
+	// 连接数据库
+	DB, err = gorm.Open(postgres.Open(dsn), &gorm.Config{})
+	if err != nil {
+		logrus.WithError(err).Error("数据库连接失败") // 改为Error（不退出）
+		return err                             // 返回错误
+	}
+
+	// 自动迁移表（创建/更新Comment表）
+	if err := DB.AutoMigrate(&Comment{}); err != nil {
+		logrus.WithError(err).Error("数据库迁移失败") // 改为Error（不退出）
+		return err                             // 返回错误
+	}
+
+	logrus.Info("PostgreSQL 数据库初始化成功")
+	return nil // 成功返回nil
+}

db/model.go

+package db
+
+import (
+	"github.com/sirupsen/logrus"
+	"gorm.io/gorm"
+)
+
+// Comment 数据库模型
+type Comment struct {
+	ID      int    `json:"id" gorm:"primaryKey;autoIncrement"`
+	Name    string `json:"name" gorm:"not null"`
+	Comment string `json:"content" gorm:"not null"`
+}
+
+// CreateComment 创建评论
+func CreateComment(name, content string) (*Comment, error) {
+	comment := &Comment{
+		Name:    name,
+		Comment: content,
+	}
+	if err := DB.Create(comment).Error; err != nil {
+		logrus.WithError(err).Error("创建评论失败")
+		return nil, err
+	}
+	logrus.WithFields(logrus.Fields{
+		"comment_id": comment.ID,
+		"name":       comment.Name,
+	}).Info("评论创建成功")
+	return comment, nil
+}
+
+// GetComments 获取评论（支持分页）
+func GetComments(page, size int) ([]Comment, int64, error) {
+	var comments []Comment
+	var total int64
+
+	// 查询总数
+	if err := DB.Model(&Comment{}).Count(&total).Error; err != nil {
+		logrus.WithError(err).Error("获取评论总数失败")
+		return nil, 0, err
+	}
+
+	// 分页查询
+	if size == -1 {
+		// 返回所有评论
+		if err := DB.Find(&comments).Error; err != nil {
+			logrus.WithError(err).Error("获取所有评论失败")
+			return nil, 0, err
+		}
+	} else {
+		// 分页
+		offset := (page - 1) * size
+		if err := DB.Limit(size).Offset(offset).Find(&comments).Error; err != nil {
+			logrus.WithError(err).Error("获取分页评论失败")
+			return nil, 0, err
+		}
+	}
+
+	logrus.WithFields(logrus.Fields{
+		"page":  page,
+		"size":  size,
+		"total": total,
+	}).Info("评论查询成功")
+	return comments, total, nil
+}
+
+// DeleteComment 删除评论
+func DeleteComment(id int) error {
+	result := DB.Where("id = ?", id).Delete(&Comment{})
+	if err := result.Error; err != nil {
+		logrus.WithError(err).Error("删除评论失败")
+		return err
+	}
+	if result.RowsAffected == 0 {
+		logrus.WithField("comment_id", id).Warn("评论不存在")
+		return gorm.ErrRecordNotFound
+	}
+	logrus.WithField("comment_id", id).Info("评论删除成功")
+	return nil
+}

go.mod

+module github.com/zyz/comment-api
+
+go 1.21
+
+require (
+	github.com/sirupsen/logrus v1.9.3
+	gorm.io/driver/postgres v1.6.0
+	gorm.io/gorm v1.30.0
+)
+
+require (
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
+	github.com/jackc/pgx/v5 v5.6.0 // indirect
+	github.com/jackc/puddle/v2 v2.2.2 // indirect
+	github.com/jinzhu/inflection v1.0.0 // indirect
+	github.com/jinzhu/now v1.1.5 // indirect
+	golang.org/x/crypto v0.31.0 // indirect
+	golang.org/x/sync v0.10.0 // indirect
+	golang.org/x/sys v0.28.0 // indirect
+	golang.org/x/text v0.21.0 // indirect
+)

go.sum

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+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
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+github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM=
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+github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 h1:iCEnooe7UlwOQYpKFhBabPMi4aNAfoODPEFNiAnClxo=
+github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761/go.mod h1:5TJZWKEWniPve33vlWYSoGYefn3gLQRzjfDlhSJ9ZKM=
+github.com/jackc/pgx/v5 v5.6.0 h1:SWJzexBzPL5jb0GEsrPMLIsi/3jOo7RHlzTjcAeDrPY=
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+github.com/jackc/puddle/v2 v2.2.2 h1:PR8nw+E/1w0GLuRFSmiioY6UooMp6KJv0/61nB7icHo=
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+github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
+github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
+github.com/jinzhu/now v1.1.5 h1:/o9tlHleP7gOFmsnYNz3RGnqzefHA47wQpKrrdTIwXQ=
+github.com/jinzhu/now v1.1.5/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/sirupsen/logrus v1.9.3 h1:dueUQJ1C2q9oE3F7wvmSGAaVtTmUizReu6fjN8uqzbQ=
+github.com/sirupsen/logrus v1.9.3/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
+github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
+golang.org/x/crypto v0.31.0 h1:ihbySMvVjLAeSH1IbfcRTkD/iNscyz8rGzjF/E5hV6U=
+golang.org/x/crypto v0.31.0/go.mod h1:kDsLvtWBEx7MV9tJOj9bnXsPbxwJQ6csT/x4KIN4Ssk=
+golang.org/x/sync v0.10.0 h1:3NQrjDixjgGwUOCaF8w2+VYHv0Ve/vGYSbdkTa98gmQ=
+golang.org/x/sync v0.10.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.28.0 h1:Fksou7UEQUWlKvIdsqzJmUmCX3cZuD2+P3XyyzwMhlA=
+golang.org/x/sys v0.28.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/text v0.21.0 h1:zyQAAkrwaneQ066sspRyJaG9VNi/YJ1NfzcGB3hZ/qo=
+golang.org/x/text v0.21.0/go.mod h1:4IBbMaMmOPCJ8SecivzSH54+73PCFmPWxNTLm+vZkEQ=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gorm.io/driver/postgres v1.6.0 h1:2dxzU8xJ+ivvqTRph34QX+WrRaJlmfyPqXmoGVjMBa4=
+gorm.io/driver/postgres v1.6.0/go.mod h1:vUw0mrGgrTK+uPHEhAdV4sfFELrByKVGnaVRkXDhtWo=
+gorm.io/gorm v1.30.0 h1:qbT5aPv1UH8gI99OsRlvDToLxW5zR7FzS9acZDOZcgs=
+gorm.io/gorm v1.30.0/go.mod h1:8Z33v652h4//uMA76KjeDH8mJXPm1QNCYrMeatR0DOE=

main.go

+package main
+
+import (
+	"net/http"
+
+	"github.com/sirupsen/logrus"
+	"github.com/zyz/comment-api/db" // 保留数据库包导入（正确）
+)
+
+// ------------------------------
+// CORS中间件（保持不变，解决跨域问题）
+// ------------------------------
+func corsMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// 允许的前端Origin（修改为你的前端实际地址，如http://localhost:5500）
+		allowedOrigins := []string{
+			"http://localhost:5500", // 保留原有的localhost
+			"http://127.0.0.1:5500", // 添加前端实际的Origin（Live Server的地址）
+		}
+		origin := r.Header.Get("Origin")
+
+		for _, o := range allowedOrigins {
+			if o == origin {
+				w.Header().Set("Access-Control-Allow-Origin", origin)
+				break
+			}
+		}
+
+		w.Header().Set("Access-Control-Allow-Methods", "GET, POST, OPTIONS")
+		w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
+
+		if r.Method == http.MethodOptions {
+			w.WriteHeader(http.StatusOK)
+			return
+		}
+
+		next.ServeHTTP(w, r)
+	})
+}
+
+func main() {
+	// 初始化日志（保持不变）
+	logrus.SetFormatter(&logrus.JSONFormatter{})
+	logrus.Info("启动服务器...")
+
+	// 初始化数据库（修改：接收error并处理）
+	if err := db.InitDB(); err != nil { // 现在db.InitDB()返回error，可正确接收
+		logrus.WithError(err).Fatal("数据库初始化失败") // 这里用Fatal退出程序
+	}
+	logrus.Info("PostgreSQL 数据库初始化成功")
+
+	// 注册路由（直接使用main包中的函数，无需前缀）
+	mux := http.NewServeMux()
+	mux.HandleFunc("/comment/get", GetCommentsHandler)      // 直接使用GetCommentsHandler（来自server.go）
+	mux.HandleFunc("/comment/add", AddCommentHandler)       // 直接使用AddCommentHandler（来自server.go）
+	mux.HandleFunc("/comment/delete", DeleteCommentHandler) // 直接使用DeleteCommentHandler（来自server.go）
+
+	// 应用CORS中间件（保持不变）
+	handler := corsMiddleware(mux)
+
+	// 启动服务器（保持不变）
+	addr := ":8080"
+	logrus.WithField("address", addr).Info("服务器启动")
+	if err := http.ListenAndServe(addr, handler); err != nil {
+		logrus.WithError(err).Fatal("服务器启动失败")
+	}
+}

server.go

+package main // 必须是main包，和main.go同目录
+
+import (
+	"encoding/json"
+	"net/http"
+	"strconv"
+
+	"github.com/sirupsen/logrus"
+	"github.com/zyz/comment-api/db"
+	"gorm.io/gorm"
+)
+
+// Response 统一响应格式（保持不变）
+type Response struct {
+	Code int         `json:"code"`
+	Msg  string      `json:"msg"`
+	Data interface{} `json:"data"`
+}
+
+// GetCommentsResponse 获取评论响应（保持不变）
+type GetCommentsResponse struct {
+	Total    int64        `json:"total"`
+	Comments []db.Comment `json:"comments"`
+}
+
+// ------------------------------
+// 导出函数（首字母大写，main包中可直接使用）
+// ------------------------------
+func GetCommentsHandler(w http.ResponseWriter, r *http.Request) { // 首字母大写，导出
+	log := logrus.WithFields(logrus.Fields{
+		"method": r.Method,
+		"path":   r.URL.Path,
+	})
+
+	if r.Method != http.MethodGet {
+		respondError(w, http.StatusMethodNotAllowed, "方法不被允许", nil, log)
+		return
+	}
+
+	page, size := parsePaginationParams(r)
+	log = log.WithFields(logrus.Fields{
+		"page": page,
+		"size": size,
+	})
+
+	comments, total, err := db.GetComments(page, size)
+	if err != nil {
+		respondError(w, http.StatusInternalServerError, "查询评论失败", nil, log.WithError(err))
+		return
+	}
+
+	data := GetCommentsResponse{
+		Total:    total,
+		Comments: comments,
+	}
+	respondSuccess(w, data, log)
+}
+
+func AddCommentHandler(w http.ResponseWriter, r *http.Request) { // 首字母大写，导出
+	log := logrus.WithFields(logrus.Fields{
+		"method": r.Method,
+		"path":   r.URL.Path,
+	})
+
+	if r.Method != http.MethodPost {
+		respondError(w, http.StatusMethodNotAllowed, "方法不被允许", nil, log)
+		return
+	}
+
+	var req struct {
+		Name    string `json:"name"`
+		Content string `json:"content"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		respondError(w, http.StatusBadRequest, "无效的请求体", nil, log.WithError(err))
+		return
+	}
+
+	if req.Name == "" || req.Content == "" {
+		respondError(w, http.StatusBadRequest, "姓名和内容为必填项", nil, log)
+		return
+	}
+
+	comment, err := db.CreateComment(req.Name, req.Content)
+	if err != nil {
+		respondError(w, http.StatusInternalServerError, "创建评论失败", nil, log.WithError(err))
+		return
+	}
+
+	respondSuccess(w, comment, log)
+}
+
+func DeleteCommentHandler(w http.ResponseWriter, r *http.Request) { // 首字母大写，导出
+	log := logrus.WithFields(logrus.Fields{
+		"method": r.Method,
+		"path":   r.URL.Path,
+	})
+
+	if r.Method != http.MethodPost {
+		respondError(w, http.StatusMethodNotAllowed, "方法不被允许", nil, log)
+		return
+	}
+
+	idStr := r.URL.Query().Get("id")
+	id, err := strconv.Atoi(idStr)
+	if err != nil || id <= 0 {
+		respondError(w, http.StatusBadRequest, "无效的评论 ID", nil, log.WithError(err))
+		return
+	}
+
+	if err := db.DeleteComment(id); err != nil {
+		if err == gorm.ErrRecordNotFound {
+			respondError(w, http.StatusNotFound, "评论不存在", nil, log)
+		} else {
+			respondError(w, http.StatusInternalServerError, "删除评论失败", nil, log.WithError(err))
+		}
+		return
+	}
+
+	respondSuccess(w, nil, log)
+}
+
+// parsePaginationParams 解析分页参数（保持不变）
+func parsePaginationParams(r *http.Request) (page, size int) {
+	pageStr := r.URL.Query().Get("page")
+	sizeStr := r.URL.Query().Get("size")
+
+	page, err := strconv.Atoi(pageStr)
+	if err != nil || page < 1 {
+		page = 1
+	}
+
+	size, err = strconv.Atoi(sizeStr)
+	if err != nil || size < -1 || size == 0 {
+		size = 10
+	}
+
+	return page, size
+}
+
+// respondSuccess 发送成功响应（保持不变）
+func respondSuccess(w http.ResponseWriter, data interface{}, log *logrus.Entry) {
+	resp := Response{
+		Code: 0,
+		Msg:  "成功",
+		Data: data,
+	}
+	sendResponse(w, http.StatusOK, resp, log)
+}
+
+// respondError 发送错误响应（保持不变）
+func respondError(w http.ResponseWriter, status int, msg string, data interface{}, log *logrus.Entry) {
+	resp := Response{
+		Code: status,
+		Msg:  msg,
+		Data: data,
+	}
+	log.WithFields(logrus.Fields{
+		"status": status,
+		"msg":    msg,
+	}).Error("请求失败")
+	sendResponse(w, status, resp, log)
+}
+
+// sendResponse 发送JSON响应（保持不变）
+func sendResponse(w http.ResponseWriter, status int, resp Response, log *logrus.Entry) {
+	// 关键：添加charset=utf-8
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	w.WriteHeader(status)
+	if err := json.NewEncoder(w).Encode(resp); err != nil {
+		log.WithError(err).Error("发送响应失败")
+	}
+}