1. 输出json和protobuf

新建user.proto文件

syntax = "proto3";
option go_package = ".;proto";
message Teacher {
    string name = 1;
    repeated string course = 2;
}
package main
import (
    "github.com/gin-gonic/gin"
    "net/http"
    "start/gin_t/proto"
)
func main() {
    r := gin.Default()
    // gin.H is a shortcut for map[string]interface{}
    r.GET("/someJSON", func(c *gin.Context) {
        c.JSON(http.StatusOK, gin.H{"message": "hey", "status": http.StatusOK})
    })
    r.GET("/moreJSON", func(c *gin.Context) {
        // You also can use a struct
        var msg struct {
            Name    string `json:"user"`
            Message string
            Number  int
        }
        msg.Name = "Lena"
        msg.Message = "hey"
        msg.Number = 123
        // Note that msg.Name becomes "user" in the JSON
        // Will output  :   {"user": "Lena", "Message": "hey", "Number": 123}
        c.JSON(http.StatusOK, msg)
    })
    r.GET("/someProtoBuf", func(c *gin.Context) {
        courses := []string{"python", "django", "go"}
        // The specific definition of protobuf is written in the testdata/protoexample file.
        data := &proto.Teacher{
            Name: "bobby",
            Course:  courses,
        }
        // Note that data becomes binary data in the response
        // Will output protoexample.Test protobuf serialized data
        c.ProtoBuf(http.StatusOK, data)
    })
    // Listen and serve on 0.0.0.0:8080
    r.Run(":8083")
}

2. PureJSON

通常情况下，JSON会将特殊的HTML字符替换为对应的unicode字符，比如<替换为\u003c，如果想原样输出html，则使用PureJSON

func main() {
    r := gin.Default()
    // Serves unicode entities
    r.GET("/json", func(c *gin.Context) {
        c.JSON(200, gin.H{
            "html": "<b>Hello, world!</b>",
        })
    })
    // Serves literal characters
    r.GET("/purejson", func(c *gin.Context) {
        c.PureJSON(200, gin.H{
            "html": "<b>Hello, world!</b>",
        })
    })
    // listen and serve on 0.0.0.0:8080
    r.Run(":8080")
}