Irir的 Context 有两个方法，返回的是我们已经在前面的章节中提到的 net/http 标准的 http.ResponseWriter 和 http.Request。

    • Context.Request()
    • Context.ResponseWriter()

    然而，除了 Iris Context 提供的独特的 Iris 特性和帮助，为了更易于开发，我们提供了一些现有 net/http 功能的包装器。

    这里是完整的方法列表，在你处理 URL 查询字符串时可能帮助你。

    1. // URLParam returns true if the url parameter exists, otherwise false.
    2. URLParamExists(name string) bool
    4. // URLParamDefault returns the get parameter from a request,
    5. // if not found then "def" is returned.
    6. URLParamDefault(name string, def string) string
    8. // URLParam returns the get parameter from a request, if any.
    9. URLParam(name string) string
    11. // URLParamTrim returns the url query parameter with
    12. // trailing white spaces removed from a request.
    13. URLParamTrim(name string) string
    15. // URLParamTrim returns the escaped url query parameter from a request.
    16. URLParamEscape(name string) string
    18. // URLParamInt returns the url query parameter as int value from a request,
    19. // returns -1 and an error if parse failed.
    20. URLParamInt(name string) (int, error)
    22. // URLParamIntDefault returns the url query parameter as int value from a request,
    23. // if not found or parse failed then "def" is returned.
    24. URLParamIntDefault(name string, def int) int
    26. // URLParamInt32Default returns the url query parameter as int32 value from a request,
    27. // if not found or parse failed then "def" is returned.
    28. URLParamInt32Default(name string, def int32) int32
    30. // URLParamInt64 returns the url query parameter as int64 value from a request,
    31. // returns -1 and an error if parse failed.
    32. URLParamInt64(name string) (int64, error)
    34. // URLParamInt64Default returns the url query parameter as int64 value from a request,
    35. // if not found or parse failed then "def" is returned.
    36. URLParamInt64Default(name string, def int64) int64
    38. // URLParamFloat64 returns the url query parameter as float64 value from a request,
    39. // returns -1 and an error if parse failed.
    40. URLParamFloat64(name string) (float64, error)
    42. // URLParamFloat64Default returns the url query parameter as float64 value from a request,
    43. // if not found or parse failed then "def" is returned.
    44. URLParamFloat64Default(name string, def float64) float64
    46. // URLParamBool returns the url query parameter as boolean value from a request,
    47. // returns an error if parse failed or not found.
    48. URLParamBool(name string) (bool, error)
    50. // URLParams returns a map of GET query parameters separated by comma if more than one
    51. // it returns an empty map if nothing found.
    52. URLParams() map[string]string

    查询字符串参数通过使用已有的底层的 request 对象解析。这个请求响应一个匹配 /welcome?firstname=Jane&lastname=Doe 的 URL。

    • ctx.URLParam("lastname") == ctx.Request().URL.Query().Get("lastname")

    示例代码：

    1. app.Get("/welcome", func(ctx iris.Context) {
    2.     firstname := ctx.URLParamDefault("firstname", "Guest")
    3.     lastname := ctx.URLParam("lastname") 
    5.     ctx.Writef("Hello %s %s", firstname, lastname)
    6. })