网站读取速度慢,百度手机网站优化,phpcms做装修网站,网站怎么做网上报名Golang学习笔记_19——Stringer Golang学习笔记_20——error Golang学习笔记_21——Reader 文章目录 io.Reader 示例从字符串中读取从文件中读取从HTTP响应中读取从内存的字节切片中读取自定义io.Reader实现 源码 io.Reader 示例
从字符串中读取
func ReadFromStrDemo() {str…Golang学习笔记_19——Stringer Golang学习笔记_20——error Golang学习笔记_21——Reader 文章目录 io.Reader 示例从字符串中读取从文件中读取从HTTP响应中读取从内存的字节切片中读取自定义io.Reader实现 源码 io.Reader 示例
从字符串中读取
func ReadFromStrDemo() {str : hello worldreader : bufio.NewReader(strings.NewReader(str))buf : make([]byte, 2)for {n, err : reader.Read(buf)if err ! nil err ! io.EOF {fmt.Println(Error reading, err)break}if n 0 {break}fmt.Println(string(buf[:n]))if err io.EOF {break}}
}测试方法
func TestReadFromStrDemo(t *testing.T) {ReadFromStrDemo()
}输出结果 RUN TestReadFromStrDemo
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--- PASS: TestReadFromStrDemo (0.00s)
PASS从文件中读取
func ReadFromFileDemo() {file, err : os.Open(test.txt)if err ! nil {fmt.Println(Error opening file, err)return}defer file.Close()reader : bufio.NewReader(file)buf : make([]byte, 1)for {n, err : reader.Read(buf)if err ! nil err ! io.EOF {fmt.Println(Error reading, err)break}if n 0 {break}fmt.Println(string(buf[:n]))if err io.EOF {break}}
}测试方法
func TestReadFromFileDemo(t *testing.T) {ReadFromFileDemo()
}输出结果 RUN TestReadFromFileDemo
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--- PASS: TestReadFromFileDemo (0.00s)
PASS从HTTP响应中读取
func ReadFromHTTPResponseDemo() {resp, err : http.Get(https://www.bing.com)if err ! nil {fmt.Println(Error, err)return}defer resp.Body.Close()if resp.StatusCode ! http.StatusOK {fmt.Println(StatusCode, resp.StatusCode)return}body, err : io.ReadAll(resp.Body)if err ! nil {fmt.Println(Error, err)return}fmt.Println(string(body))}测试文件
func TestReadFromHTTPResponseDemo(t *testing.T) {ReadFromHTTPResponseDemo()
}输出结果 RUN TestReadFromHTTPResponseDemo
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--- PASS: TestReadFromHTTPResponseDemo (1.40s)
PASS从内存的字节切片中读取
func ReadFromMemoryDemo() {data : []byte(hello io.Reader)reader : bytes.NewReader(data)buf : make([]byte, 1)for {n, err : reader.Read(buf)if err ! nil err ! io.EOF {fmt.Println(Error reading, err)break}if n 0 {break}fmt.Println(string(buf[:n]))if err io.EOF {break}}
}测试方法
func TestReadFromMemoryDemo(t *testing.T) {ReadFromMemoryDemo()
}输出结果 RUN TestReadFromMemoryDemo
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--- PASS: TestReadFromMemoryDemo (0.00s)
PASS自定义io.Reader实现
// 自定义io.Reader实现
type myReader struct {data []bytepos int
}func (mr *myReader) Read(p []byte) (int, error) {n : copy(p, mr.data[mr.pos:])mr.pos nif mr.pos len(mr.data) {return n, io.EOF}return n, nil
}func ReadFromMyReaderDemo() {data : []byte(hello io.Reader)reader : myReader{data, 0}buf : make([]byte, 1)for {n, err : reader.Read(buf)if err ! nil err ! io.EOF {fmt.Println(Error reading, err)break}if n 0 {break}fmt.Println(string(buf[:n]))if err io.EOF {break}}
}测试方法
func TestReadFromMyReaderDemo(t *testing.T) {ReadFromMyReaderDemo()
}输出结果 RUN TestReadFromMyReaderDemo
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--- PASS: TestReadFromMyReaderDemo (0.00s)
PASS源码
// reader_demo_2.go 文件
package reader_demoimport (bufiobytesfmtionet/httposstrings
)func ReadFromStrDemo() {str : hello worldreader : bufio.NewReader(strings.NewReader(str))buf : make([]byte, 2)for {n, err : reader.Read(buf)if err ! nil err ! io.EOF {fmt.Println(Error reading, err)break}if n 0 {break}fmt.Println(string(buf[:n]))if err io.EOF {break}}
}func ReadFromFileDemo() {file, err : os.Open(test.txt)if err ! nil {fmt.Println(Error opening file, err)return}defer file.Close()reader : bufio.NewReader(file)buf : make([]byte, 1)for {n, err : reader.Read(buf)if err ! nil err ! io.EOF {fmt.Println(Error reading, err)break}if n 0 {break}fmt.Println(string(buf[:n]))if err io.EOF {break}}
}func ReadFromHTTPResponseDemo() {resp, err : http.Get(https://www.bing.com)if err ! nil {fmt.Println(Error, err)return}defer resp.Body.Close()if resp.StatusCode ! http.StatusOK {fmt.Println(StatusCode, resp.StatusCode)return}body, err : io.ReadAll(resp.Body)if err ! nil {fmt.Println(Error, err)return}fmt.Println(string(body))}func ReadFromMemoryDemo() {data : []byte(hello io.Reader)reader : bytes.NewReader(data)buf : make([]byte, 1)for {n, err : reader.Read(buf)if err ! nil err ! io.EOF {fmt.Println(Error reading, err)break}if n 0 {break}fmt.Println(string(buf[:n]))if err io.EOF {break}}
}// 自定义io.Reader实现
type myReader struct {data []bytepos int
}func (mr *myReader) Read(p []byte) (int, error) {n : copy(p, mr.data[mr.pos:])mr.pos nif mr.pos len(mr.data) {return n, io.EOF}return n, nil
}func ReadFromMyReaderDemo() {data : []byte(hello io.Reader)reader : myReader{data, 0}buf : make([]byte, 1)for {n, err : reader.Read(buf)if err ! nil err ! io.EOF {fmt.Println(Error reading, err)break}if n 0 {break}fmt.Println(string(buf[:n]))if err io.EOF {break}}
}
// readder_demo_2_test.go 文件
package reader_demoimport testingfunc TestReadFromStrDemo(t *testing.T) {ReadFromStrDemo()
}func TestReadFromFileDemo(t *testing.T) {ReadFromFileDemo()
}func TestReadFromHTTPResponseDemo(t *testing.T) {ReadFromHTTPResponseDemo()
}func TestReadFromMemoryDemo(t *testing.T) {ReadFromMemoryDemo()
}func TestReadFromMyReaderDemo(t *testing.T) {ReadFromMyReaderDemo()
}
