即接口返回的數據格式 ``` 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("/someXML", func(c *gin.Context) { c.XML(http.StatusOK, gin.H{"message": "hey", "status": http.StatusOK}) }) r.GET("/someYAML", func(c *gin.Context) { c.YAML(http.StatusOK, gin.H{"message": "hey", "status": http.StatusOK}) }) r.GET("/someProtoBuf", func(c *gin.Context) { reps := []int64{int64(1), int64(2)} label := "test" // The specific definition of protobuf is written in the testdata/protoexample file. data := &protoexample.Test{ Label: &label, Reps: reps, } // 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(":8080") } ``` **SecureJSON** 使用SecureJSON可以防止json劫持，如果返回的數據是數組，則會默認在返回值前加上`"while(1)"` ``` func main() { r := gin.Default() // 可以自定義返回的json數據前綴 // r.SecureJsonPrefix(")]}',\n") r.GET("/someJSON", func(c *gin.Context) { names := []string{"lena", "austin", "foo"} // 將會輸出: while(1);["lena","austin","foo"] c.SecureJSON(http.StatusOK, names) }) // Listen and serve on 0.0.0.0:8080 r.Run(":8080") } ``` **JSONP** 使用JSONP可以跨域傳輸，如果參數中存在回調參數，那么返回的參數將是回調函數的形式 ``` func main() { r := gin.Default() r.GET("/JSONP", func(c *gin.Context) { data := map[string]interface{}{ "foo": "bar", } // 訪問 http://localhost:8080/JSONP?callback=call // 將會輸出: call({foo:"bar"}) c.JSONP(http.StatusOK, data) }) // Listen and serve on 0.0.0.0:8080 r.Run(":8080") } ``` **AsciiJSON** 使用AsciiJSON將使特殊字符編碼 ``` func main() { r := gin.Default() r.GET("/someJSON", func(c *gin.Context) { data := map[string]interface{}{ "lang": "GO語言", "tag": "<br>", } // 將輸出: {"lang":"GO\u8bed\u8a00","tag":"\u003cbr\u003e"} c.AsciiJSON(http.StatusOK, data) }) // Listen and serve on 0.0.0.0:8080 r.Run(":8080") } ``` **PureJSON** 通常情況下，JSON會將特殊的HTML字符替換為對應的unicode字符，比如`<`替換為`\u003c`，如果想原樣輸出html，則使用PureJSON，這個特性在Go 1.6及以下版本中無法使用。 ``` 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") } ```