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xml与java代码相互装换的工具类 xml与java代码相互装换的工具类是什么

gowuye 2024-04-04 11:54 7 浏览 0 评论

这是一个java操作xml文件的工具类,最大的亮点在于能够通过工具类直接生成xml同样层次结构的java代码,也就是说,只要你定义好了xml的模板,就能一键生成java代码。省下了自己再使用工具类写代码的时间,极大得提高了效率。

开源oschina的git地址:https://git.oschina.net/lv-success/createXml.git

喜欢就点个赞哈。。。。

首先来看看工具类代码

package com.lfq.createXml;

import java.io.ByteArrayInputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.io.StringReader;

import java.io.StringWriter;

import java.io.UnsupportedEncodingException;

import java.util.ArrayList;

import java.util.List;

import java.util.Properties;

import javax.xml.XMLConstants;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.parsers.ParserConfigurationException;

import javax.xml.transform.OutputKeys;

import javax.xml.transform.Result;

import javax.xml.transform.Source;

import javax.xml.transform.Transformer;

import javax.xml.transform.TransformerException;

import javax.xml.transform.TransformerFactory;

import javax.xml.transform.dom.DOMSource;

import javax.xml.transform.stream.StreamResult;

import javax.xml.transform.stream.StreamSource;

import javax.xml.validation.Schema;

import javax.xml.validation.SchemaFactory;

import javax.xml.validation.Validator;

import org.apache.commons.lang3.StringUtils;

import org.w3c.dom.Document;

import org.w3c.dom.Element;

import org.w3c.dom.Node;

import org.w3c.dom.NodeList;

import org.xml.sax.SAXException;

/**

* 操作xml文件以及生成java代码的工具

* @author lfq

* @since 1.0, Jun 12, 2007

*/

public final class XmlUtils {

private static final String XMLNS_XSI = "xmlns:xsi";

private static final String XSI_SCHEMA_LOCATION = "xsi:schemaLocation";

private static final String LOGIC_YES = "yes";

private static final String DEFAULT_ENCODE = "UTF-8";

private static final String REG_INVALID_CHARS = "\\d+;";

/**

* Creates a new document instance.

*

* @return a new document instance

* @throws XmlException problem creating a new document

*/

public static Document newDocument() throws XmlException {

Document doc = null;

try {

doc = DocumentBuilderFactory.newInstance().newDocumentBuilder()

.newDocument();

} catch (ParserConfigurationException e) {

throw new XmlException(e);

}

return doc;

}

/**

* Parses the content of the given XML file as an XML document.

*

* @param file the XML file instance

* @return the document instance representing the entire XML document

* @throws XmlException problem parsing the XML file

*/

public static Document getDocument(File file) throws XmlException {

InputStream in = getInputStream(file);

return getDocument(in);

}

/**

* Parses the content of the given stream as an XML document.

*

* @param in the XML file input stream

* @return the document instance representing the entire XML document

* @throws XmlException problem parsing the XML input stream

*/

public static Document getDocument(InputStream in) throws XmlException {

Document doc = null;

try {

DocumentBuilder builder = DocumentBuilderFactory.newInstance()

.newDocumentBuilder();

doc = builder.parse(in);

} catch (ParserConfigurationException e) {

throw new XmlException(e);

} catch (SAXException e) {

throw new XmlException(XmlException.XML_PARSE_ERROR, e);

} catch (IOException e) {

throw new XmlException(XmlException.XML_READ_ERROR, e);

} finally {

if (in != null) {

try {

in.close();

} catch (IOException e) {

// nothing to do

}

}

}

return doc;

}

/**

* Creates a root element as well as a new document with specific tag name.

*

* @param tagName the name of the root element

* @return a new element instance

* @throws XmlException problem generating a new document

*/

public static Element createRootElement(String tagName) throws XmlException {

Document doc = newDocument();

Element root = doc.createElement(tagName);

doc.appendChild(root);

return root;

}

/**

* Gets the root element from input stream.

*

* @param in the XML file input stream

* @return the root element of parsed document

* @throws XmlException problem parsing the XML file input stream

*/

public static Element getRootElementFromStream(InputStream in)

throws XmlException {

return getDocument(in).getDocumentElement();

}

/**

* Gets the root element from given XML file.

*

* @param fileName the name of the XML file

* @return the root element of parsed document

* @throws XmlException problem parsing the XML file

*/

public static Element getRootElementFromFile(File file)

throws XmlException {

return getDocument(file).getDocumentElement();

}

/**

* Gets the root element from the given XML payload.

*

* @param payload the XML payload representing the XML file.

* @return the root element of parsed document

* @throws XmlException problem parsing the XML payload

*/

public static Element getRootElementFromString(String payload)

throws XmlException {

if (payload == null || payload.trim().length() < 1) {

throw new XmlException(XmlException.XML_PAYLOAD_EMPTY);

}

byte[] bytes = null;

try {

bytes = payload.getBytes(DEFAULT_ENCODE);

} catch (UnsupportedEncodingException e) {

throw new XmlException(XmlException.XML_ENCODE_ERROR, e);

}

InputStream in = new ByteArrayInputStream(bytes);

return getDocument(in).getDocumentElement();

}

/**

* Gets the descendant elements list from the parent element.

*

* @param parent the parent element in the element tree

* @param tagName the specified tag name

* @return the NOT NULL descendant elements list

*/

public static List<Element> getElements(Element parent, String tagName) {

NodeList nodes = parent.getElementsByTagName(tagName);

List<Element> elements = new ArrayList<Element>();

for (int i = 0; i < nodes.getLength(); i++) {

Node node = nodes.item(i);

if (node instanceof Element) {

elements.add((Element) node);

}

}

return elements;

}

/**

* Gets the immediately descendant element from the parent element.

*

* @param parent the parent element in the element tree

* @param tagName the specified tag name.

* @return immediately descendant element of parent element, NULL otherwise.

*/

public static Element getElement(Element parent, String tagName) {

List<Element> children = getElements(parent, tagName);

if (children.isEmpty()) {

return null;

} else {

return children.get(0);

}

}

/**

* Gets the immediately child elements list from the parent element.

*

* @param parent the parent element in the element tree

* @param tagName the specified tag name

* @return the NOT NULL immediately child elements list

*/

public static List<Element> getChildElements(Element parent, String tagName) {

NodeList nodes = parent.getElementsByTagName(tagName);

List<Element> elements = new ArrayList<Element>();

for (int i = 0; i < nodes.getLength(); i++) {

Node node = nodes.item(i);

if (node instanceof Element && node.getParentNode() == parent) {

elements.add((Element) node);

}

}

return elements;

}

/**

* Gets the immediately child element from the parent element.

*

* @param parent the parent element in the element tree

* @param tagName the specified tag name

* @return immediately child element of parent element, NULL otherwise

*/

public static Element getChildElement(Element parent, String tagName) {

List<Element> children = getChildElements(parent, tagName);

if (children.isEmpty()) {

return null;

} else {

return children.get(0);

}

}

/**

* Gets the value of the child element by tag name under the given parent

* element. If there is more than one child element, return the value of the

* first one.

*

* @param parent the parent element

* @param tagName the tag name of the child element

* @return value of the first child element, NULL if tag not exists

*/

public static String getElementValue(Element parent, String tagName) {

String value = null;

Element element = getElement(parent, tagName);

if (element != null) {

value = element.getTextContent();

}

return value;

}

/**

* Appends the child element to the parent element.

*

* @param parent the parent element

* @param tagName the child element name

* @return the child element added to the parent element

*/

public static Element appendElement(Element parent, String tagName) {

Element child = parent.getOwnerDocument().createElement(tagName);

parent.appendChild(child);

return child;

}

/**

* Appends the child element as well as value to the parent element.

*

* @param parent the parent element

* @param tagName the child element name

* @param value the child element value

* @return the child element added to the parent element

*/

public static Element appendElement(Element parent, String tagName,

String value) {

Element child = appendElement(parent, tagName);

child.setTextContent(value);

return child;

}

/**

* Appends another element as a child element.

*

* @param parent the parent element

* @param child the child element to append

*/

public static void appendElement(Element parent, Element child) {

Node tmp = parent.getOwnerDocument().importNode(child, true);

parent.appendChild(tmp);

}

/**

* Appends the CDATA element to the parent element.

*

* @param parent the parent element

* @param tagName the CDATA element name

* @param value the CDATA element value

* @return the CDATA element added to the parent element

*/

public static Element appendCDATAElement(Element parent, String tagName,

String value) {

Element child = appendElement(parent, tagName);

if (value == null) { // avoid "null" word in the XML payload

value = "";

}

Node cdata = child.getOwnerDocument().createCDATASection(value);

child.appendChild(cdata);

return child;

}

/**

* Converts the Node/Element instance to XML payload.

*

* @param node the node/element instance to convert

* @return the XML payload representing the node/element

* @throws XmlException problem converting XML to string

*/

public static String childNodeToString(Node node) throws XmlException {

String payload = null;

try {

Transformer tf = TransformerFactory.newInstance().newTransformer();

Properties props = tf.getOutputProperties();

props.setProperty(OutputKeys.OMIT_XML_DECLARATION, LOGIC_YES);

tf.setOutputProperties(props);

StringWriter writer = new StringWriter();

tf.transform(new DOMSource(node), new StreamResult(writer));

payload = writer.toString();

payload = payload.replaceAll(REG_INVALID_CHARS, " ");

} catch (TransformerException e) {

throw new XmlException(XmlException.XML_TRANSFORM_ERROR, e);

}

return payload;

}

/**

* Converts the Node/Document/Element instance to XML payload.

*

* @param node the node/document/element instance to convert

* @return the XML payload representing the node/document/element

* @throws XmlException problem converting XML to string

*/

public static String nodeToString(Node node) throws XmlException {

String payload = null;

try {

Transformer tf = TransformerFactory.newInstance().newTransformer();

Properties props = tf.getOutputProperties();

props.setProperty(OutputKeys.INDENT, LOGIC_YES);

props.setProperty(OutputKeys.ENCODING, DEFAULT_ENCODE);

tf.setOutputProperties(props);

StringWriter writer = new StringWriter();

tf.transform(new DOMSource(node), new StreamResult(writer));

payload = writer.toString();

payload = payload.replaceAll(REG_INVALID_CHARS, " ");

} catch (TransformerException e) {

throw new XmlException(XmlException.XML_TRANSFORM_ERROR, e);

}

return payload;

}

/**

* Converts the an XML file to XML payload.

*

* @param file the XML file instance

* @return the XML payload representing the XML file

* @throws XmlException problem transforming XML to string

*/

public static String xmlToString(File file) throws XmlException {

Element root = getRootElementFromFile(file);

return nodeToString(root);

}

/**

* Converts the an XML file input stream to XML payload.

*

* @param in the XML file input stream

* @return the payload represents the XML file

* @throws XmlException problem transforming XML to string

*/

public static String xmlToString(InputStream in) throws XmlException {

Element root = getRootElementFromStream(in);

return nodeToString(root);

}

/**

* Saves the node/document/element as XML file.

*

* @param doc the XML node/document/element to save

* @param file the XML file to save

* @throws XmlException problem persisting XML file

*/

public static void saveToXml(Node doc, File file) throws XmlException {

OutputStream out = null;

try {

Transformer tf = TransformerFactory.newInstance().newTransformer();

Properties props = tf.getOutputProperties();

props.setProperty(OutputKeys.METHOD, XMLConstants.XML_NS_PREFIX);

props.setProperty(OutputKeys.INDENT, LOGIC_YES);

tf.setOutputProperties(props);

DOMSource dom = new DOMSource(doc);

out = getOutputStream(file);

Result result = new StreamResult(out);

tf.transform(dom, result);

} catch (TransformerException e) {

throw new XmlException(XmlException.XML_TRANSFORM_ERROR, e);

} finally {

if (out != null) {

try {

out.close();

} catch (IOException e) {

// nothing to do

}

}

}

}

/**

* Validates the element tree context via given XML schema file.

*

* @param doc the XML document to validate

* @param schemaFile the XML schema file instance

* @throws XmlException error occurs if the schema file not exists

*/

public static void validateXml(Node doc, File schemaFile)

throws XmlException {

validateXml(doc, getInputStream(schemaFile));

}

/**

* Validates the element tree context via given XML schema file.

*

* @param doc the XML document to validate

* @param schemaStream the XML schema file input stream

* @throws XmlException error occurs if validation fail

*/

public static void validateXml(Node doc, InputStream schemaStream)

throws XmlException {

try {

Source source = new StreamSource(schemaStream);

Schema schema = SchemaFactory.newInstance(

XMLConstants.W3C_XML_SCHEMA_NS_URI).newSchema(source);

Validator validator = schema.newValidator();

validator.validate(new DOMSource(doc));

} catch (SAXException e) {

throw new XmlException(XmlException.XML_VALIDATE_ERROR, e);

} catch (IOException e) {

throw new XmlException(XmlException.XML_READ_ERROR, e);

} finally {

if (schemaStream != null) {

try {

schemaStream.close();

} catch (IOException e) {

// nothing to do

}

}

}

}

/**

* Transforms the XML content to XHTML/HTML format string with the XSL.

*

* @param payload the XML payload to convert

* @param xsltFile the XML stylesheet file

* @return the transformed XHTML/HTML format string

* @throws XmlException problem converting XML to HTML

*/

public static String xmlToHtml(String payload, File xsltFile)

throws XmlException {

String result = null;

try {

Source template = new StreamSource(xsltFile);

Transformer transformer = TransformerFactory.newInstance()

.newTransformer(template);

Properties props = transformer.getOutputProperties();

props.setProperty(OutputKeys.OMIT_XML_DECLARATION, LOGIC_YES);

transformer.setOutputProperties(props);

StreamSource source = new StreamSource(new StringReader(payload));

StreamResult sr = new StreamResult(new StringWriter());

transformer.transform(source, sr);

result = sr.getWriter().toString();

} catch (TransformerException e) {

throw new XmlException(XmlException.XML_TRANSFORM_ERROR, e);

}

return result;

}

/**

* Sets the namespace to specific element.

*

* @param element the element to set

* @param namespace the namespace to set

* @param schemaLocation the XML schema file location URI

*/

public static void setNamespace(Element element, String namespace,

String schemaLocation) {

element.setAttributeNS(XMLConstants.XMLNS_ATTRIBUTE_NS_URI,

XMLConstants.XMLNS_ATTRIBUTE, namespace);

element.setAttributeNS(XMLConstants.XMLNS_ATTRIBUTE_NS_URI, XMLNS_XSI,

XMLConstants.W3C_XML_SCHEMA_INSTANCE_NS_URI);

element.setAttributeNS(XMLConstants.W3C_XML_SCHEMA_INSTANCE_NS_URI,

XSI_SCHEMA_LOCATION, schemaLocation);

}

/**

* Encode the XML payload to legality character.

*

* @param payload the XML payload to encode

* @return the encoded XML payload

* @throws XmlException problem encoding the XML payload

*/

public static String encodeXml(String payload) throws XmlException {

Element root = createRootElement(XMLConstants.XML_NS_PREFIX);

root.setTextContent(payload);

return childNodeToString(root.getFirstChild());

}

private static InputStream getInputStream(File file) throws XmlException {

InputStream in = null;

try {

in = new FileInputStream(file);

} catch (FileNotFoundException e) {

throw new XmlException(XmlException.FILE_NOT_FOUND, e);

}

return in;

}

private static OutputStream getOutputStream(File file) throws XmlException {

OutputStream in = null;

try {

in = new FileOutputStream(file);

} catch (FileNotFoundException e) {

throw new XmlException(XmlException.FILE_NOT_FOUND, e);

}

return in;

}

/**

* @Desc 把实体类中有的字段直接转为xml节点

* @author LV_FQ

* @date 2016年12月15日

* @param parent

* @param formMap

* @param fields

*/

public static void entityToXml(Element parent, String... fields){

for(String field : fields){

String temp = "XmlUtils.appendElement(root, \"" + field + "\", decHeadFormMap.getStr(\"field\"));";

System.out.println(temp);

XmlUtils.appendElement(parent, field, "取值");

}

}

/**

* @Desc 根据xml生成java代码

* @author LV_FQ

* @date 2016年12月16日

* @param file xml文件

*/

public static void createJavaCode(File file){

XMLToJavaUtils.createJavaCode(file);

}

}

class XmlException extends RuntimeException {

private static final long serialVersionUID = 381260478228427716L;

public static final String XML_PAYLOAD_EMPTY = "xml.payload.empty";

public static final String XML_ENCODE_ERROR = "xml.encoding.invalid";

public static final String FILE_NOT_FOUND = "xml.file.not.found";

public static final String XML_PARSE_ERROR = "xml.parse.error";

public static final String XML_READ_ERROR = "xml.read.error";

public static final String XML_VALIDATE_ERROR = "xml.validate.error";

public static final String XML_TRANSFORM_ERROR = "xml.transform.error";

public XmlException() {

super();

}

public XmlException(String key, Throwable cause) {

super(key, cause);

}

public XmlException(String key) {

super(key);

}

public XmlException(Throwable cause) {

super(cause);

}

}

/**

* @Desc 根据xml的格式生成xml的对应的java生成代码

* @author LV_FQ

* @date 2016年12月16日 下午2:08:38

* @version 1.0

*

*/

class XMLToJavaUtils {

public static void createJavaCode(File file) {

try {

//File file = new File("C:/Users/SUCCESS/Desktop/temp.xml");

DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();

DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();

Document doc = dBuilder.parse(file);

if (doc.hasChildNodes()) {

printNote(doc.getChildNodes(), null);

}

} catch (Exception e) {

e.printStackTrace();

}

}

private static void printNote(NodeList nodeList, Node parent) {

for (int i = 0; i < nodeList.getLength(); i++) {

Node node = nodeList.item(i);

if (node.getNodeType() == Node.ELEMENT_NODE) {

if(parent == null){

System.out.println("Element "+ getTagName(node.getNodeName())+" = XmlUtils.createRootElement(\""+ node.getNodeName() +"\");");

}else{

String temp = "XmlUtils.appendElement("+getTagName(parent == null? null : parent.getNodeName())+", \"" + node.getNodeName();

if (node.hasChildNodes() && node.getChildNodes().getLength() > 1) {

System.out.println();

//非叶节点把节点的名称加上,以便子节点和父节点做关联

temp = "Element " + getTagName(node.getNodeName()) + " = " + temp + "\");";

}else{

//叶节点把注释加上

//temp += "\", \"value\");//" + node.getTextContent();

temp += "\", \""+ node.getTextContent() +"\");";

}

System.out.println(temp);

}

if (node.hasChildNodes()) {

printNote(node.getChildNodes(), node);

}

}

}

}

/**

* @Desc 把字符串第一个字母转小写

* @author LV_FQ

* @date 2016年12月16日

* @param name

* @return

*/

private static String getTagName(String name){

if(StringUtils.isBlank(name)){

return "";

}

String temp = name;

temp = temp.substring(0, 1).toLowerCase() + temp.substring(1);

return temp;

}

}

测试类

package com.lfq.createXml;

import java.io.File;

import org.w3c.dom.Element;

public class TestXml {

public static void main(String[] args) {

Element note = XmlUtils.createRootElement("note");

XmlUtils.appendElement(note, "to", "George1");

XmlUtils.appendElement(note, "from", "John2");

XmlUtils.appendElement(note, "heading", "Reminder1");

XmlUtils.appendElement(note, "body", "Don't forget the meeting!");

XmlUtils.saveToXml(note, new File("/home/lv-success/Desktop/temp.xml"));

//使用xml生成工具生成java代码(控制台输出)

File file = new File("/home/lv-success/Desktop/temp.xml");

XmlUtils.createJavaCode(file);

}

}

从test中可以看出,工具类通过已有的操作xml文件的方法读取xml的结构,同时根据读取的节点内容直接把对于生成的方法打印到控制台中,如此嵌套打印,最终打印出这个xml文件的相同java层次结构的代码。

如果对生成的java代码有不同要求,大家可以直接修改工具类中的生成java代码的方法。能生成自己最终要求最接近的代码最好,怎么方便怎么来哈。

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c语言解剖课:只读变量、常量、字面量傻傻分不清?

写在前面本篇主题的缘起,是因为一个计算机专业的大学生在和我讨论c语言问题时,说const常量如何如何,我说变量被const修饰了,还是变量,不是“常量”。他给了我一个截图:他说大模型都是这样回答的,变...

C/C++编程笔记:C数组、字符串常量和指针!三分钟弄懂它

想弄懂C语言中数组和指针的关系吗?这篇文章就占据你三分钟时间,看完你肯定会有收获!数组数组声明为数据类型名称[constant-size],并将一个数据类型的一个或多个实例分组到一个可寻址的位...

C语言入门到精通【第008讲】——C语言常量

C语言常量常量是固定值,在程序执行期间不会改变。这些固定的值,又叫做字面量。常量可以是任何的基本数据类型,比如整数常量、浮点常量、字符常量,或字符串字面值,也有枚举常量。常量就像是常规的变量,只不过常...

这是C语言无法修改得东西,C语言基础教程之常量解析

常量是指程序在执行期间不会改变的固定值。这些固定值也称为文字。常量可以是任何基本数据类型,如整数常量,浮点常量,字符常量或字符串文字,还有枚举常量。常量被视为常规变量,除了它们的值在定义后无法修改。整...

C语言中的单精度、双精度、常量等都有什么意思?

刚接触C语言时,对于常量,变量,浮点,单精度,双精度等问题的理解,大都很模糊不清,其实在程序运行过程中,其值不能改变的量称为常量。如12、0、-3为整型常量,4.6、-1.23为实型常量,'a'、'...

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