HarmonyOS API：@ohos.xml (xml解析与生成)

joytrian

发布于 2023-4-11 18:07

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版本：v3.1 Beta

@ohos.xml (xml解析与生成)

更新时间: 2023-02-17 09:19

说明

本模块首批接口从API version 8开始支持。后续版本的新增接口，采用上角标单独标记接口的起始版本。

导入模块

import xml from '@ohos.xml';

XmlSerializer

constructor

constructor(buffer: ArrayBuffer | DataView, encoding?: string)

XmlSerializer的构造函数。

系统能力： SystemCapability.Utils.Lang

参数：

参数名	类型	必填	说明
buffer	ArrayBuffer \| DataView	是	用于接收写入xml信息的ArrayBuffer或DataView内存。
encoding	string	否	编码格式。

示例：

let arrayBuffer = new ArrayBuffer(2048);
let thatSer = new xml.XmlSerializer(arrayBuffer,"utf-8");
thatSer.setDeclaration();
let result = '<?xml version="1.0" encoding="utf-8"?>';
let view = new Uint8Array(arrayBuffer);
let view1 = "";
for (let i = 0; i < result.length; ++i) {
    view1 = view1 + String.fromCodePoint(view[i]);
}
console.log(view1) //<?xml version="1.0" encoding="utf-8"?>

setAttributes

setAttributes(name: string, value: string): void

设置Attributes方法。

系统能力： SystemCapability.Utils.Lang

参数：

参数名	类型	必填	说明
name	string	是	属性的key值。
value	string	是	属性的value值。

示例：

const myMAX = 2048;
let arrayBuffer = new ArrayBuffer(myMAX);
let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.startElement("note");
thatSer.setAttributes("importance1", "high1");
thatSer.endElement();
let result = '<note importance1="high1"/>';
let view = new Uint8Array(arrayBuffer);
let view1 = "";
for (let i = 0; i < result.length; ++i) {
    view1 = view1 + String.fromCodePoint(view[i]);
}
console.log(view1) //<note importance1="high1"/>

addEmptyElement

addEmptyElement(name: string): void

写入一个空元素。

系统能力： SystemCapability.Utils.Lang

参数：

参数名	类型	必填	说明
name	string	是	该空元素的元素名。

示例：

const myMAX = 2048;
let arrayBuffer = new ArrayBuffer(myMAX);
let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.addEmptyElement("d");
let result = '<d/>';
let view = new Uint8Array(arrayBuffer);
let view1 = "";
for (let i = 0; i < result.length; ++i) {
    view1 = view1 + String.fromCodePoint(view[i]);
}
console.log(view1) //<d/>

setDeclaration

setDeclaration(): void

设置Declaration方法。

系统能力： SystemCapability.Utils.Lang

示例：

const myMAX = 2048;
let arrayBuffer = new ArrayBuffer(myMAX);
let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.setDeclaration();
thatSer.setNamespace("h", "http://www.w3.org/TR/html4/");
thatSer.startElement("note");
thatSer.endElement();
let result = '<?xml version="1.0" encoding="utf-8"?>\r\n<h:note xmlns:h="http://www.w3.org/TR/html4/"/>';
let view = new Uint8Array(arrayBuffer);
let view1 = "";
for (let i = 0; i < result.length; ++i) {
    view1 = view1 + String.fromCodePoint(view[i]);
}
console.log(view1) //<?xml version="1.0" encoding="utf-8"?>

startElement

startElement(name: string): void

根据给定名称写入元素开始标记。

系统能力： SystemCapability.Utils.Lang

参数：

参数名	类型	必填	说明
name	string	是	当前元素的元素名。

示例：

const myMAX = 2048;
let arrayBuffer = new ArrayBuffer(myMAX);
let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.setDeclaration();
thatSer.setNamespace("h", "http://www.w3.org/TR/html4/");
thatSer.startElement("note");
thatSer.endElement();
let result = '<?xml version="1.0" encoding="utf-8"?>\r\n<h:note xmlns:h="http://www.w3.org/TR/html4/"/>';
let view = new Uint8Array(arrayBuffer);
let view1 = "";
for (let i = 0; i < result.length; ++i) {
    view1 = view1 + String.fromCodePoint(view[i]);
}
console.log(JSON.stringify(view1)) //<?xml version="1.0" encoding="utf-8"?>\r\n<h:note xmlns:h="http://www.w3.org/TR/html4/"/>

endElement

endElement(): void

写入元素结束标记。

系统能力： SystemCapability.Utils.Lang

示例：

const myMAX = 2048;
let arrayBuffer = new ArrayBuffer(myMAX);
let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.setDeclaration();
thatSer.setNamespace("h", "http://www.w3.org/TR/html4/");
thatSer.startElement("note");
thatSer.endElement();
let result = '<?xml version="1.0" encoding="utf-8"?>\r\n<h:note xmlns:h="http://www.w3.org/TR/html4/"/>';
let view = new Uint8Array(arrayBuffer);
let view1 = "";
for (let i = 0; i < result.length; ++i) {
    view1 = view1 + String.fromCodePoint(view[i]);
}
console.log(JSON.stringify(view1)) //<?xml version="1.0" encoding="utf-8"?>\r\n<h:note xmlns:h="http://www.w3.org/TR/html4/"/>

setNamespace

setNamespace(prefix: string, namespace: string): void

写入当前元素标记的命名空间。

系统能力： SystemCapability.Utils.Lang

参数：

参数名	类型	必填	说明
prefix	string	是	当前元素及其子元素的前缀。
namespace	string	是	当前元素及其子元素的命名空间。

示例：

const myMAX = 2048;
let arrayBuffer = new ArrayBuffer(myMAX);
let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.setDeclaration();
thatSer.setNamespace("h", "http://www.w3.org/TR/html4/");
thatSer.startElement("note");
thatSer.endElement();
let result = '<?xml version="1.0" encoding="utf-8"?>\r\n<h:note xmlns:h="http://www.w3.org/TR/html4/"/>';
let view = new Uint8Array(arrayBuffer);
let view1 = "";
for (let i = 0; i < result.length; ++i) {
    view1 = view1 + String.fromCodePoint(view[i]);
}
console.log(JSON.stringify(view1)) //<?xml version="1.0" encoding="utf-8"?>\r\n<h:note xmlns:h="http://www.w3.org/TR/html4/"/>

setComment

setComment(text: string): void

写入comment属性。

系统能力： SystemCapability.Utils.Lang

参数：

参数名	类型	必填	说明
text	string	是	当前元素的注释内容。

示例：

const myMAX = 2048;
let arrayBuffer = new ArrayBuffer(myMAX);
let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.setComment("Hello, World!");
let result = '<!--Hello, World!-->';
let view = new Uint8Array(arrayBuffer);
let view1 = "";
for (let i = 0; i < result.length; ++i) {
    view1 = view1 + String.fromCodePoint(view[i]);
}
console.log(view1) //<!--Hello, World!-->'

setCDATA

setCDATA(text: string): void

写入CDATA属性。

系统能力： SystemCapability.Utils.Lang

参数：

参数名	类型	必填	说明
text	string	是	CDATA属性的内容。

示例：

const myMAX = 2048;
let arrayBuffer = new ArrayBuffer(myMAX);
let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.setCDATA('root SYSTEM')
let result = '<![CDATA[root SYSTEM]]>';
let view = new Uint8Array(arrayBuffer);
let view1 = "";
for (let i = 0; i < result.length; ++i) {
    view1 = view1 + String.fromCodePoint(view[i]);
}
console.log(view1) //'<![CDATA[root SYSTEM]]>''

setText

setText(text: string): void

设置Text方法。

系统能力： SystemCapability.Utils.Lang

参数：

参数名	类型	必填	说明
text	string	是	text属性的内容。

示例：

const myMAX = 2048;
let arrayBuffer = new ArrayBuffer(myMAX);
let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.startElement("note");
thatSer.setAttributes("importance", "high");
thatSer.setText("Happy1");
thatSer.endElement();
let result = '<note importance="high">Happy1</note>';
let view = new Uint8Array(arrayBuffer);
let view1 = "";
for (let i = 0; i < result.length; ++i) {
    view1 = view1 + String.fromCodePoint(view[i]);
}
console.log(view1) // '<note importance="high">Happy1</note>'

setDocType

setDocType(text: string): void

写入DocType属性。

系统能力： SystemCapability.Utils.Lang

参数：

参数名	类型	必填	说明
text	string	是	DocType属性的内容。

示例：

const myMAX = 2048;
let arrayBuffer = new ArrayBuffer(myMAX);
let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.setDocType('root SYSTEM "http://www.test.org/test.dtd"');
let result = '<!DOCTYPE root SYSTEM "http://www.test.org/test.dtd">';
let view = new Uint8Array(arrayBuffer);
let view1 = "";
for (let i = 0; i < result.length; ++i) {
    view1 = view1 + String.fromCodePoint(view[i]);
}
console.log(view1) //'<!DOCTYPE root SYSTEM "http://www.test.org/test.dtd">'

XmlPullParser

constructor(buffer: ArrayBuffer | DataView, encoding?: string)

创建并返回一个XmlPullParser对象，该XmlPullParser对象传参两个, 第一参数是ArrayBuffer或DataView类型的一段内存，第二个参数为文件格式（默认为UTF-8）

系统能力： SystemCapability.Utils.Lang

参数：

参数名	类型	必填	说明
buffer	ArrayBuffer \| DataView	是	含有xml文本信息的ArrayBuffer或者DataView。
encoding	string	否	编码格式（仅支持utf-8）。

示例：

let strXml =
    '<?xml version="1.0" encoding="utf-8"?>' +
    '<!DOCTYPE note [\n<!ENTITY foo "baa">]>' +
    '<note importance="high" logged="true">' +
    '    <![CDATA[\r\nfuncrion matchwo(a,6)\r\n{\r\nreturn 1;\r\n}\r\n]]>' +
    '    <!--Hello, World!-->' +
    '    <company>John & Hans</company>' +
    '    <title>Happy</title>' +
    '    <title>Happy</title>' +
    '    <lens>Work</lens>' +
    '    <lens>Play</lens>' +
    '    <?go there?>' +
    '    <a><b/></a>' +
    '    <h:table xmlns:h="http://www.w3.org/TR/html4/">' +
    '        <h:tr>' +
    '            <h:td>Apples</h:td>' +
    '            <h:td>Bananas</h:td>' +
    '        </h:tr>' +
    '    </h:table>' +
    '</note>';
let arrayBuffer = new ArrayBuffer(strXml.length);
let bufView = new Uint8Array(arrayBuffer);
let strLen = strXml.length;
for (let i = 0; i < strLen; ++i) {
    bufView[i] = strXml.charCodeAt(i);
}
let that = new xml.XmlPullParser(arrayBuffer, 'UTF-8');
let str1 = '';
function func1(name, value){
    str1 += name+':'+value;
    return true;
}
let options = {supportDoctype:true, ignoreNameSpace:true, tagValueCallbackFunction:func1}
that.parse(options);
console.log(str1) //'note:company:title:title:lens:lens:a:b:h:table:h:tr:h:td:h:td:'

parse

parse(option: ParseOptions): void

该接口用于解析xml。

系统能力： SystemCapability.Utils.Lang

参数：

参数名	类型	必填	说明
option	ParseOptions	是	用户控制以及获取解析信息的选项。

示例：

let strXml =
            '<?xml version="1.0" encoding="utf-8"?>' +
            '<note importance="high" logged="true">' +
            '    <title>Happy</title>' +
            '    <todo>Work</todo>' +
            '    <todo>Play</todo>' +
            '</note>';
let arrayBuffer = new ArrayBuffer(strXml.length);
let bufView = new Uint8Array(arrayBuffer);
let strLen = strXml.length;
for (let tmp = 0; tmp < strLen; ++tmp) {
    bufView[tmp] = strXml.charCodeAt(tmp);
}
let that = new xml.XmlPullParser(arrayBuffer);
let arrTag = {};
let str = "";
let i = 0;
function func(key, value){
    arrTag[i] = 'key:'+key+' value:'+ value.getDepth();
    str += arrTag[i];
    i++;
    return true; // Determines whether to continuely parse, which is used to continue or terminate parsing.
}
let options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);
console.log(str);
// 输出:
// key:0 value:0key:2 value:1key:10 value:1key:2 value:2key:4 value:2key:3 value:2key:10 value:1key:2 value:2key:4 value:2key:3 value:2key:10 value:1key:2 value:2key:4 value:2key:3 value:2key:3 value:1key:1 value:0
// 解析:
// key代表了当前事件类型，value为当前解析的深度。你可以根据EVENTTYPE来知道具体的解析事件。例如本示例结果key: value代表含义为:
// 0(START_DOCUMENT):0(起始深度为0), 2(START_TAG):1(解析到开始标签node, 对应深度为1), 10(WHITESPACE):1(解析到空白标签空格, 对应深度为1), 2(START_TAG):2(解析到开始标签title, 对应深度为2), ...

ParseOptions

xml解析选项。

系统能力： 以下各项对应的系统能力均为SystemCapability.Utils.Lang

名称	类型	必填	说明
supportDoctype	boolean	否	是否忽略Doctype , 默认false。
ignoreNameSpace	boolean	否	是否忽略NameSpace，默认false。
tagValueCallbackFunction	(name: string, value: string) => boolean	否	获取tagValue回调函数。
attributeValueCallbackFunction	(name: string, value: string) => boolean	否	获取attributeValue回调函数。
tokenValueCallbackFunction	(eventType: EventType, value: ParseInfo) => boolean	否	获取tokenValue回调函数。

ParseInfo

当前xml解析信息。

getColumnNumber

getColumnNumber(): number

获取当前列号，从1开始。

系统能力： SystemCapability.Utils.Lang

返回值：

类型	说明
number	返回当前列号。

示例：

let strXml =
            '<?xml version="1.0" encoding="utf-8"?>' +
            '<note importance="high" logged="true">' +
            '    <title>Happy</title>' +
            '    <todo>Work</todo>' +
            '    <todo>Play</todo>' +
            '</note>';
let arrayBuffer = new ArrayBuffer(strXml.length);
let bufView = new Uint8Array(arrayBuffer);
let strLen = strXml.length;
for (let tmp = 0; tmp < strLen; ++tmp) {
    bufView[tmp] = strXml.charCodeAt(tmp);
}
let that = new xml.XmlPullParser(arrayBuffer);
let arrTag = {};
let str = "";
let i = 0;
function func(key, value){
    arrTag[i] = 'key:'+key+' value:'+ value.getColumnNumber();
    str += arrTag[i];
    i++;
    return true; // Determines whether to continuely parse, which is used to continue or terminate parsing.
}
let options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);
console.log(str);
// 输出:
// key:0 value:1key:2 value:77key:10 value:81key:2 value:88key:4 value:93key:3 value:101key:10 value:105key:2 value:111key:4 value:115key:3 value:122key:10 value:126key:2 value:132key:4 value:136key:3 value:143key:3 value:150key:1 value:299

getDepth

getDepth(): number

获取元素的当前深度。

系统能力： SystemCapability.Utils.Lang

返回值：

类型	说明
number	返回元素的当前深度。

示例：

let strXml =
            '<?xml version="1.0" encoding="utf-8"?>' +
            '<note importance="high" logged="true">' +
            '    <title>Happy</title>' +
            '    <todo>Work</todo>' +
            '    <todo>Play</todo>' +
            '</note>';
let arrayBuffer = new ArrayBuffer(strXml.length);
let bufView = new Uint8Array(arrayBuffer);
let strLen = strXml.length;
for (let tmp = 0; tmp < strLen; ++tmp) {
    bufView[tmp] = strXml.charCodeAt(tmp);
}
let that = new xml.XmlPullParser(arrayBuffer);
let arrTag = {};
let str = "";
let i = 0;
function func(key, value){
    arrTag[i] = 'key:'+key+' value:'+ value.getDepth();
    str += arrTag[i];
    i++;
    return true; // Determines whether to continuely parse, which is used to continue or terminate parsing.
}
let options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);
console.log(str);
// 输出:
// key:0 value:0key:2 value:1key:10 value:1key:2 value:2key:4 value:2key:3 value:2key:10 value:1key:2 value:2key:4 value:2key:3 value:2key:10 value:1key:2 value:2key:4 value:2key:3 value:2key:3 value:1key:1 value:0
// 解析:
// key代表了当前事件类型，value为当前解析的深度。你可以根据EVENTTYPE来知道具体的解析事件。例如本示例结果key: value代表含义为:
// 0(START_DOCUMENT):0(起始深度为0), 2(START_TAG):1(解析到开始标签node, 对应深度为1), 10(WHITESPACE):1(解析到空白标签空格, 对应深度为1), 2(START_TAG):2(解析到开始标签title, 对应深度为2), ...

getLineNumber

getLineNumber(): number

获取当前行号，从1开始。

系统能力： SystemCapability.Utils.Lang

返回值：

类型	说明
number	返回当前行号。

示例：

let strXml =
            '<?xml version="1.0" encoding="utf-8"?>' +
            '<note importance="high" logged="true">' +
            '    <title>Happy</title>' +
            '    <todo>Work</todo>' +
            '    <todo>Play</todo>' +
            '</note>';
let arrayBuffer = new ArrayBuffer(strXml.length);
let bufView = new Uint8Array(arrayBuffer);
let strLen = strXml.length;
for (let tmp = 0; tmp < strLen; ++tmp) {
    bufView[tmp] = strXml.charCodeAt(tmp);
}
let that = new xml.XmlPullParser(arrayBuffer);
let arrTag = {};
let str = "";
let i = 0;
function func(key, value){
    arrTag[i] = 'key:'+key+' value:'+ value.getLineNumber();
    str += arrTag[i];
    i++;
    return true; // Determines whether to continuely parse, which is used to continue or terminate parsing.
}
let options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);
console.log(str);
// 输出:
// key:0 value:1key:2 value:1key:10 value:1key:2 value:1key:4 value:1key:3 value:1key:10 value:1key:2 value:1key:4 value:1key:3 value:1key:10 value:1key:2 value:1key:4 value:1key:3 value:1key:3 value:1key:1 value:1

getName

getName(): string

获取当前元素名称。

系统能力： SystemCapability.Utils.Lang

返回值：

类型	说明
string	返回当前元素名称。

示例：

let strXml =
            '<?xml version="1.0" encoding="utf-8"?>' +
            '<note importance="high" logged="true">' +
            '    <title>Happy</title>' +
            '    <todo>Work</todo>' +
            '    <todo>Play</todo>' +
            '</note>';
let arrayBuffer = new ArrayBuffer(strXml.length);
let bufView = new Uint8Array(arrayBuffer);
let strLen = strXml.length;
for (let tmp = 0; tmp < strLen; ++tmp) {
    bufView[tmp] = strXml.charCodeAt(tmp);
}
let that = new xml.XmlPullParser(arrayBuffer);
let arrTag = {};
let str = "";
let i = 0;
function func(key, value){
    arrTag[i] = 'key:'+key+' value:'+ value.getName();
    str += arrTag[i];
    i++;
    return true; // Determines whether to continuely parse, which is used to continue or terminate parsing.
}
let options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);
console.log(str);
// 输出:
// key:0 value:key:2 value:notekey:10 value:key:2 value:titlekey:4 value:key:3 value:titlekey:10 value:key:2 value:todokey:4 value:key:3 value:todokey:10 value:key:2 value:todokey:4 value:key:3 value:todokey:3 value:notekey:1 value:

getNamespace

getNamespace(): string

获取当前元素的命名空间。

系统能力： SystemCapability.Utils.Lang

返回值：

类型	说明
string	返回当前元素的命名空间。

示例：

let strXml =
            '<?xml version="1.0" encoding="utf-8"?>' +
            '<note importance="high" logged="true">' +
            '    <title>Happy</title>' +
            '    <todo>Work</todo>' +
            '    <todo>Play</todo>' +
            '</note>';
let arrayBuffer = new ArrayBuffer(strXml.length);
let bufView = new Uint8Array(arrayBuffer);
let strLen = strXml.length;
for (let tmp = 0; tmp < strLen; ++tmp) {
    bufView[tmp] = strXml.charCodeAt(tmp);
}
let that = new xml.XmlPullParser(arrayBuffer);
let arrTag = {};
let str = "";
let i = 0;
function func(key, value){
    arrTag[i] = 'key:'+key+' value:'+ value.getNamespace();
    str += arrTag[i];
    i++;
    return true; // Determines whether to continuely parse, which is used to continue or terminate parsing.
}
let options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);
console.log(str);
// 输出:
// key:0 value:key:2 value:key:10 value:key:2 value:key:4 value:key:3 value:key:10 value:key:2 value:key:4 value:key:3 value:key:10 value:key:2 value:key:4 value:key:3 value:key:3 value:key:1 value:

getPrefix

getPrefix(): string

获取当前元素前缀。

系统能力： SystemCapability.Utils.Lang

返回值：

类型	说明
string	返回当前元素前缀。

示例：

let strXml =
            '<?xml version="1.0" encoding="utf-8"?>' +
            '<note importance="high" logged="true">' +
            '    <title>Happy</title>' +
            '    <todo>Work</todo>' +
            '    <todo>Play</todo>' +
            '</note>';
let arrayBuffer = new ArrayBuffer(strXml.length);
let bufView = new Uint8Array(arrayBuffer);
let strLen = strXml.length;
for (let tmp = 0; tmp < strLen; ++tmp) {
    bufView[tmp] = strXml.charCodeAt(tmp);
}
let that = new xml.XmlPullParser(arrayBuffer);
let arrTag = {};
let str = "";
let i = 0;
function func(key, value){
    arrTag[i] = 'key:'+key+' value:'+ value.getPrefix();
    str += arrTag[i];
    i++;
    return true; // Determines whether to continuely parse, which is used to continue or terminate parsing.
}
let options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);
console.log(str);
// 输出:
// key:0 value:key:2 value:key:10 value:key:2 value:key:4 value:key:3 value:key:10 value:key:2 value:key:4 value:key:3 value:key:10 value:key:2 value:key:4 value:key:3 value:key:3 value:key:1 value:

getText

getText(): string

获取当前事件的文本内容。

系统能力： SystemCapability.Utils.Lang

返回值：

类型	说明
string	返回当前事件的文本内容。

示例：

let strXml =
            '<?xml version="1.0" encoding="utf-8"?>' +
            '<note importance="high" logged="true">' +
            '    <title>Happy</title>' +
            '    <todo>Work</todo>' +
            '    <todo>Play</todo>' +
            '</note>';
let arrayBuffer = new ArrayBuffer(strXml.length);
let bufView = new Uint8Array(arrayBuffer);
let strLen = strXml.length;
for (let tmp = 0; tmp < strLen; ++tmp) {
    bufView[tmp] = strXml.charCodeAt(tmp);
}
let that = new xml.XmlPullParser(arrayBuffer);
let arrTag = {};
let str = "";
let i = 0;
function func(key, value){
    arrTag[i] = 'key:'+key+' value:'+ value.getText();
    str += arrTag[i];
    i++;
    return true; // Determines whether to continuely parse, which is used to continue or terminate parsing.
}
let options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);
console.log(str);
// 输出:
// key:0 value:key:2 value:key:10 value:    key:2 value:key:4 value:Happykey:3 value:key:10 value:    key:2 value:key:4 value:Workkey:3 value:key:10 value:    key:2 value:key:4 value:Playkey:3 value:key:3 value:key:1 value:

isEmptyElementTag

isEmptyElementTag(): boolean

判断当前元素是否为空元素。

系统能力： SystemCapability.Utils.Lang

返回值：

类型	说明
boolean	返回true，当前元素为空元素。

示例：

let strXml =
            '<?xml version="1.0" encoding="utf-8"?>' +
            '<note importance="high" logged="true">' +
            '    <title>Happy</title>' +
            '    <todo>Work</todo>' +
            '    <todo>Play</todo>' +
            '</note>';
let arrayBuffer = new ArrayBuffer(strXml.length);
let bufView = new Uint8Array(arrayBuffer);
let strLen = strXml.length;
for (let tmp = 0; tmp < strLen; ++tmp) {
    bufView[tmp] = strXml.charCodeAt(tmp);
}
let that = new xml.XmlPullParser(arrayBuffer);
let arrTag = {};
let str = "";
let i = 0;
function func(key, value){
    arrTag[i] = 'key:'+key+' value:'+ value.isEmptyElementTag();
    str += arrTag[i];
    i++;
    return true; // Determines whether to continuely parse, which is used to continue or terminate parsing.
}
let options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);
console.log(str);
// 输出:
// key:0 value:falsekey:2 value:falsekey:10 value:falsekey:2 value:falsekey:4 value:falsekey:3 value:falsekey:10 value:falsekey:2 value:falsekey:4 value:falsekey:3 value:falsekey:10 value:falsekey:2 value:falsekey:4 value:falsekey:3 value:falsekey:3 value:falsekey:1 value:false

isWhitespace

isWhitespace(): boolean

判断当前文本事件是否仅包含空格字符。

系统能力： SystemCapability.Utils.Lang

返回值：

类型	说明
boolean	返回true，当前文本事件仅包含空格字符。

示例：

let strXml =
            '<?xml version="1.0" encoding="utf-8"?>' +
            '<note importance="high" logged="true">' +
            '    <title>Happy</title>' +
            '    <todo>Work</todo>' +
            '    <todo>Play</todo>' +
            '</note>';
let arrayBuffer = new ArrayBuffer(strXml.length);
let bufView = new Uint8Array(arrayBuffer);
let strLen = strXml.length;
for (let tmp = 0; tmp < strLen; ++tmp) {
    bufView[tmp] = strXml.charCodeAt(tmp);
}
let that = new xml.XmlPullParser(arrayBuffer);
let arrTag = {};
let str = "";
let i = 0;
function func(key, value){
    arrTag[i] = 'key:'+key+' value:'+ value.isWhitespace();
    str += arrTag[i];
    i++;
    return true; // Determines whether to continuely parse, which is used to continue or terminate parsing.
}
let options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);
console.log(str);
// 输出:
// key:0 value:truekey:2 value:falsekey:10 value:truekey:2 value:truekey:4 value:falsekey:3 value:truekey:10 value:truekey:2 value:truekey:4 value:falsekey:3 value:truekey:10 value:truekey:2 value:truekey:4 value:falsekey:3 value:truekey:3 value:truekey:1 value:true

getAttributeCount

getAttributeCount(): number

获取当前开始标记的属性数。

系统能力： SystemCapability.Utils.Lang

返回值：

类型	说明
number	当前开始标记的属性数。

示例：

let strXml =
            '<?xml version="1.0" encoding="utf-8"?>' +
            '<note importance="high" logged="true">' +
            '    <title>Happy</title>' +
            '    <todo>Work</todo>' +
            '    <todo>Play</todo>' +
            '</note>';
let arrayBuffer = new ArrayBuffer(strXml.length);
let bufView = new Uint8Array(arrayBuffer);
let strLen = strXml.length;
for (let tmp = 0; tmp < strLen; ++tmp) {
    bufView[tmp] = strXml.charCodeAt(tmp);
}
let that = new xml.XmlPullParser(arrayBuffer);
let arrTag = {};
let str = "";
let i = 0;
function func(key, value){
    arrTag[i] = 'key:'+key+' value:'+ value.getAttributeCount();
    str += arrTag[i];
    i++;
    return true; // Determines whether to continuely parse, which is used to continue or terminate parsing.
}
let options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);
console.log(str);
// 输出:
// key:0 value:0key:2 value:2key:10 value:0key:2 value:0key:4 value:0key:3 value:0key:10 value:0key:2 value:0key:4 value:0key:3 value:0key:10 value:0key:2 value:0key:4 value:0key:3 value:0key:3 value:0key:1 value:0

EventType

事件枚举。

系统能力： SystemCapability.Utils.Lang

名称	值	说明
START_DOCUMENT	0	启动文件事件。
END_DOCUMENT	1	结束文件事件。
START_TAG	2	启动标签事件。
END_TAG	3	结束标签事件。
TEXT	4	文本事件。
CDSECT	5	CDATA事件。
COMMENT	6	XML注释事件。
DOCDECL	7	XML文档类型声明事件。
INSTRUCTION	8	XML处理指令声明事件。
ENTITY_REFERENCE	9	实体引用事件。
WHITESPACE	10	空白事件。

文章转载自：https://developer.harmonyos.com/cn/docs/documentation/doc-references-V3/js-apis-xml-0000001428062024-V3?catalogVersion=V3#ZH-CN_TOPIC_0000001428062024__导入模块

分类

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标签

HarmonyOS API

已于2023-4-11 18:07:45修改

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HarmonyOS API：@ohos.xml (xml解析与生成)

@ohos.xml (xml解析与生成)

导入模块

XmlSerializer

constructor

setAttributes

addEmptyElement

setDeclaration

startElement

endElement

setNamespace

setComment

setCDATA

setText

setDocType

XmlPullParser

XmlPullParser

parse

ParseOptions

ParseInfo

getColumnNumber

getDepth

getLineNumber

getName

getNamespace

getPrefix

getText

isEmptyElementTag

isWhitespace

getAttributeCount

EventType

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