封装统一格式的body响应，但是不修改go-zero原有代码生成模板

i18n/cn/docusaurus-plugin-content-docs/current/advance/template.md

@@ -155,4 +155,170 @@ func GreetHandler(svcCtx *svc.ServiceContext) http.HandlerFunc {
 本文档仅对http相应为例讲述了自定义模板的流程，除此之外，自定义模板的场景还有：
 * model 层添加kmq
 * model 层生成待有效期option的model实例
-* http自定义相应格式
+* http自定义相应格式
+
+# 方案二：logic层使用response封装方法统一格式的body响应
+可以自定义code和data的返回内容
+
+以用户登录功能模块为例
+
+* user.api
+```
+syntax = "v1"
+
+// 统一格式的响应
+type Response {
+	Code int         `json:"code"`
+	Msg  string      `json:"msg"`
+	Data interface{} `json:"data,omitempty"`
+}
+
+// 用户登录
+type LoginRequest {
+    Username string `json:"username"`
+    Password string `json:"password"`
+}
+
+type LoginResult {
+    Id           int64  `json:"id"`
+    Username     string `json:"username"`
+    AccessToken  string `json:"access_token"`
+    AccessExpire int64  `json:"access_expire"`
+    RefreshAfter int64  `json:"refresh_after"`
+}
+
+// 用户注册
+type SignupRequest {
+    Username string `json:"username"`
+    Password string `json:"password"`
+}
+
+type SignupResult {
+    Id           int64  `json:"id"`
+    Username     string `json:"username"`
+    AccessToken  string `json:"access_token"`
+    AccessExpire int64  `json:"access_expire"`
+    RefreshAfter int64  `json:"refresh_after"`
+}
+
+@server(
+	group: user
+)
+service gateway-api {
+    @handler LoginHandler
+    post /user/login (LoginRequest) returns (Response)
+
+    @handler SignupHandler
+    post /user/signup (SignupRequest) returns (Response)
+}
+```
+
+* response.go 代码修改为
+```go
+package response
+
+import "datacenter/gateway/internal/types"
+
+// 封装统一格式的body响应，data的类型可以自定义
+func Response(code int, msg string, data interface{}) (*types.Response, error) {
+	return &types.Response{
+		Code: code,
+		Msg:  msg,
+		Data: data,
+	}, nil
+}
+
+```
+
+* internal/logic/user/loginlogic.go 代码修改为
+```go
+package user
+
+import (
+	"context"
+	"strings"
+	"time"
+
+	"datacenter/gateway/common/response"
+	"datacenter/gateway/internal/svc"
+	"datacenter/gateway/internal/types"
+	"datacenter/user/rpc/userclient"
+
+	jwt "github.com/golang-jwt/jwt/v4"
+	"github.com/zeromicro/go-zero/core/hash"
+	"github.com/zeromicro/go-zero/core/logx"
+)
+
+type LoginLogic struct {
+	logx.Logger
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+}
+
+func NewLoginLogic(ctx context.Context, svcCtx *svc.ServiceContext) *LoginLogic {
+	return &LoginLogic{
+		Logger: logx.WithContext(ctx),
+		ctx:    ctx,
+		svcCtx: svcCtx,
+	}
+}
+
+func (l *LoginLogic) Login(req *types.LoginRequest) (resp *types.Response, err error) {
+	if len(strings.TrimSpace(req.Username)) == 0 || len(strings.TrimSpace(req.Password)) == 0 {
+		return response.Response(2001, "用户名或密码错误", nil)
+	}
+	// 使用user rpc
+	userInfo, err := l.svcCtx.UserRpc.GetUserInfoByUsername(l.ctx, &userclient.UserNameRequest{
+		Username: req.Username,
+	})
+	if err != nil {
+		return response.Response(2003, "login调用userRpc错误:"+err.Error(), nil)
+		// return nil, err
+	}
+
+	// 判断登录密码
+	if userInfo.Password != hash.Md5Hex([]byte(req.Password)) {
+		return response.Response(2001, "用户名或密码错误", nil)
+	}
+
+	// jwt token
+	now := time.Now().Unix()
+	accessSecret := l.svcCtx.Config.Auth.AccessSecret
+	accessExpire := l.svcCtx.Config.Auth.AccessExpire
+	jwtToken, err := l.getJwtToken(accessSecret, now, accessExpire, int64(userInfo.Id))
+	if err != nil {
+		return response.Response(2002, "login获取jwttoken错误:" + err.Error(), nil)
+		// return nil, err
+	}
+
+	// data类型可以是map
+	// return response.Response(200, "ok", map[string]interface{}{
+	// 	"id":            userInfo.Id,
+	// 	"username":      userInfo.Username,
+	// 	"access_token":  jwtToken,
+	// 	"access_expire": now + accessExpire,
+	// 	"refresh_after": now + accessExpire/2,
+	// })
+
+	// data类型可以是结构体
+	return response.Response(200, "ok", &types.LoginResult{
+		Id:           userInfo.Id,
+		Username:     userInfo.Username,
+		AccessToken:  jwtToken,
+		AccessExpire: now + accessExpire,
+		RefreshAfter: now + accessExpire/2,
+	})
+}
+
+func (l *LoginLogic) getJwtToken(secretKey string, iat, seconds, userId int64) (string, error) {
+	claims := make(jwt.MapClaims)
+	claims["exp"] = iat + seconds
+	claims["iat"] = iat
+	claims["userId"] = userId
+	token := jwt.New(jwt.SigningMethodHS256)
+	token.Claims = claims
+	return token.SignedString([]byte(secretKey))
+}
+
+```
+