golang remove xml header

In golang, when reading xml files, you often encounter problems with the xml file header (i.e. f8368f4699af9817ef58ddbc8cd9cdc3), which may cause the parsing of the xml file to fail.

The following introduces several methods to remove the xml header.

The first method: manually remove the xml header

We can use the strings.Trim function to remove the xml header, the code is as follows:

func removeXmlHeader(xmlContent string) string {
    return strings.Trim(xmlContent, "")
}

In the above code, we use the strings.Trim function to remove the first three special characters (i.e. BOM characters, whose ASCII code is ) in xmlContent, so that xml header.

Second method: use xml.Decoder

Another way to remove the xml header is to use the xml.Decoder object to read the xml file and use decoder.Token The function obtains the Token object in the xml file. If the Token is a declaration tag (i.e. f8368f4699af9817ef58ddbc8cd9cdc3), we can skip it before parsing the xml file. The code is as follows:

func removeXmlHeader(xmlContent string) (string, error) {
    decoder := xml.NewDecoder(strings.NewReader(xmlContent))
    var result strings.Builder
    for {
        token, err := decoder.Token()
        if err == io.EOF {
            break
        }
        if err != nil {
            return "", err
        }
        switch t := token.(type) {
        case xml.ProcInst:
            if t.Target == "xml" {
                continue
            }
        }
        result.WriteString(fmt.Sprintf("%v", token))
    }
    return result.String(), nil
}

In the above code, we create an xml .Decoder object, and then use the decoder.Token function to read the Token object from the xml file. If the read Token object is a declaration tag (i.e. xml.ProcInst), we determine whether its target is xml. If so, skip this Token object. Otherwise, continue to read the next Token object until the entire xml file is read.

When we put the Token object into the strings.Builder object, we can return the processed xml string.

The third method: use xml.Unmarshal

The third method to remove the xml header is to use xml.Unmarshal to skip the xml header when parsing the xml file.

func removeXmlHeader(xmlContent string, v interface{}) error {
    xmlContent = strings.Trim(xmlContent, "")
    return xml.Unmarshal([]byte(xmlContent), v)
}

In the above code, we remove the xml file header through the strings.Trim function, and then call the xml.Unmarshal function to parse the xml file to the target object, so that the xml header can be easily removed.

To sum up, the above are three methods to remove the XML header. Which method to choose depends on the specific business needs. When using these methods, you need to pay attention to the characteristics of each method in order to choose the appropriate method to solve the problem.

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