XML 和 JSON 相互转换

XML 和 JSON 相互转换，包括 attribute。转换的时候将 XML 属性转换成JSON 的时候，前面用 @ 特殊字符表示 XML 属性

import java.io.Reader;
import java.io.StringReader;import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.XML;
import org.json.XMLParserConfiguration;
import org.json.XMLTokener;
import org.json.XMLXsiTypeConverter;public class XMLJson extends XML {private static final String ATTR_PREFIX = "@";public static JSONObject toJSONObject(Reader reader, XMLParserConfiguration config) throws JSONException {JSONObject jo = new JSONObject();XMLTokener x = new XMLTokener(reader);while (x.more()) {x.skipPast("<");if(x.more()) {parse(x, jo, null, config);}}return jo;}public static JSONObject toJSONObject(String string) throws JSONException {return toJSONObject(string, XMLParserConfiguration.ORIGINAL);}public static JSONObject toJSONObject(String string, XMLParserConfiguration config) throws JSONException {return toJSONObject(new StringReader(string), config);}public static String toString(Object object) throws JSONException {return toString(object, null, XMLParserConfiguration.ORIGINAL);}public static String toString(final Object object, final String tagName) {return toString(object, tagName, XMLParserConfiguration.ORIGINAL);}/*** Convert a JSONObject into a well-formed, element-normal XML string.** @param object*            A JSONObject.* @param tagName*            The optional name of the enclosing tag.* @param config*            Configuration that can control output to XML.* @return A string.* @throws JSONException Thrown if there is an error parsing the string*/public static String toString(final Object object, final String tagName, final XMLParserConfiguration config)throws JSONException {StringBuilder sb = new StringBuilder();JSONArray ja;JSONObject jo;String string;if (object instanceof JSONObject) {// Emit <tagName>if (tagName != null) {sb.append('<');sb.append(tagName);sb.append('>');}int indexAttr = sb.length() - 1;// Loop thru the keys.// don't use the new entrySet accessor to maintain Android Supportjo = (JSONObject) object;for (final String key : jo.keySet()) {Object value = jo.opt(key);if (value == null) {value = "";} else if (value.getClass().isArray()) {value = new JSONArray(value);}// Emit content in bodyif (key.equals(config.getcDataTagName())) {if (value instanceof JSONArray) {ja = (JSONArray) value;int jaLength = ja.length();// don't use the new iterator API to maintain support for Androidfor (int i = 0; i < jaLength; i++) {if (i > 0) {sb.append('\n');}Object val = ja.opt(i);sb.append(escape(val.toString()));}} else {sb.append(escape(value.toString()));}// Emit an array of similar keys}else if(key.startsWith(ATTR_PREFIX)) {//set attributeStringBuilder ab = new StringBuilder(" ").append(key.substring(1)).append(EQ).append(QUOT).append(escape(value.toString())).append(QUOT);sb.insert(indexAttr, ab);indexAttr = indexAttr + ab.length();}else if (value instanceof JSONArray) {ja = (JSONArray) value;int jaLength = ja.length();// don't use the new iterator API to maintain support for Androidfor (int i = 0; i < jaLength; i++) {Object val = ja.opt(i);if (val instanceof JSONArray) {sb.append('<');sb.append(key);sb.append('>');sb.append(toString(val, null, config));sb.append("</");sb.append(key);sb.append('>');} else {sb.append(toString(val, key, config));}}} else if ("".equals(value)) {sb.append('<');sb.append(key);sb.append("/>");// Emit a new tag <k>} else {sb.append(toString(value, key, config));}}if (tagName != null) {// Emit the </tagName> close tagsb.append("</");sb.append(tagName);sb.append('>');}return sb.toString();}if (object != null && (object instanceof JSONArray ||  object.getClass().isArray())) {if(object.getClass().isArray()) {ja = new JSONArray(object);} else {ja = (JSONArray) object;}int jaLength = ja.length();// don't use the new iterator API to maintain support for Androidfor (int i = 0; i < jaLength; i++) {Object val = ja.opt(i);// XML does not have good support for arrays. If an array// appears in a place where XML is lacking, synthesize an// <array> element.sb.append(toString(val, tagName == null ? "array" : tagName, config));}return sb.toString();}string = (object == null) ? "null" : escape(object.toString());return (tagName == null) ? "\"" + string + "\"": (string.length() == 0) ? "<" + tagName + "/>" : "<" + tagName+ ">" + string + "</" + tagName + ">";}/*** Scan the content following the named tag, attaching it to the context.** @param x*            The XMLTokener containing the source string.* @param context*            The JSONObject that will include the new material.* @param name*            The tag name.* @return true if the close tag is processed.* @throws JSONException*/private static boolean parse(XMLTokener x, JSONObject context, String name, XMLParserConfiguration config)throws JSONException {char c;int i;JSONObject jsonObject = null;String string;String tagName;Object token;XMLXsiTypeConverter<?> xmlXsiTypeConverter;// Test for and skip past these forms:// <!-- ... -->// <! ... >// <![ ... ]]>// <? ... ?>// Report errors for these forms:// <>// <=// <<token = x.nextToken();// <!if (token == BANG) {c = x.next();if (c == '-') {if (x.next() == '-') {x.skipPast("-->");return false;}x.back();} else if (c == '[') {token = x.nextToken();if ("CDATA".equals(token)) {if (x.next() == '[') {string = x.nextCDATA();if (string.length() > 0) {context.accumulate(config.getcDataTagName(), string);}return false;}}throw x.syntaxError("Expected 'CDATA['");}i = 1;do {token = x.nextMeta();if (token == null) {throw x.syntaxError("Missing '>' after '<!'.");} else if (token == LT) {i += 1;} else if (token == GT) {i -= 1;}} while (i > 0);return false;} else if (token == QUEST) {// <?x.skipPast("?>");return false;} else if (token == SLASH) {// Close tag </token = x.nextToken();if (name == null) {throw x.syntaxError("Mismatched close tag " + token);}if (!token.equals(name)) {throw x.syntaxError("Mismatched " + name + " and " + token);}if (x.nextToken() != GT) {throw x.syntaxError("Misshaped close tag");}return true;} else if (token instanceof Character) {throw x.syntaxError("Misshaped tag");// Open tag <} else {tagName = (String) token;token = null;jsonObject = new JSONObject();boolean nilAttributeFound = false;xmlXsiTypeConverter = null;for (;;) {if (token == null) {token = x.nextToken();}// attribute = valueif (token instanceof String) {string = (String) token;string = new StringBuilder(ATTR_PREFIX).append(string).toString();token = x.nextToken();if (token == EQ) {token = x.nextToken();if (!(token instanceof String)) {throw x.syntaxError("Missing value");}if (config.isConvertNilAttributeToNull()&& NULL_ATTR.equals(string)&& Boolean.parseBoolean((String) token)) {nilAttributeFound = true;} else if(config.getXsiTypeMap() != null && !config.getXsiTypeMap().isEmpty()&& TYPE_ATTR.equals(string)) {xmlXsiTypeConverter = config.getXsiTypeMap().get(token);} else if (!nilAttributeFound) {jsonObject.accumulate(string,config.isKeepStrings()? ((String) token): stringToValue((String) token));}token = null;} else {jsonObject.accumulate(string, "");}} else if (token == SLASH) {// Empty tag <.../>if (x.nextToken() != GT) {throw x.syntaxError("Misshaped tag");}if (config.getForceList().contains(tagName)) {// Force the value to be an arrayif (nilAttributeFound) {context.append(tagName, JSONObject.NULL);} else if (jsonObject.length() > 0) {context.append(tagName, jsonObject);} else {context.put(tagName, new JSONArray());}} else {if (nilAttributeFound) {context.accumulate(tagName, JSONObject.NULL);} else if (jsonObject.length() > 0) {context.accumulate(tagName, jsonObject);} else {context.accumulate(tagName, "");}}return false;} else if (token == GT) {// Content, between <...> and </...>for (;;) {token = x.nextContent();if (token == null) {if (tagName != null) {throw x.syntaxError("Unclosed tag " + tagName);}return false;} else if (token instanceof String) {string = (String) token;if (string.length() > 0) {if(xmlXsiTypeConverter != null) {jsonObject.accumulate(config.getcDataTagName(),stringToValue(string, xmlXsiTypeConverter));} else {jsonObject.accumulate(config.getcDataTagName(),config.isKeepStrings() ? string : stringToValue(string));}}} else if (token == LT) {// Nested elementif (parse(x, jsonObject, tagName, config)) {if (config.getForceList().contains(tagName)) {// Force the value to be an arrayif (jsonObject.length() == 0) {context.put(tagName, new JSONArray());} else if (jsonObject.length() == 1&& jsonObject.opt(config.getcDataTagName()) != null) {context.append(tagName, jsonObject.opt(config.getcDataTagName()));} else {context.append(tagName, jsonObject);}} else {if (jsonObject.length() == 0) {context.accumulate(tagName, "");} else if (jsonObject.length() == 1&& jsonObject.opt(config.getcDataTagName()) != null) {context.accumulate(tagName, jsonObject.opt(config.getcDataTagName()));} else {context.accumulate(tagName, jsonObject);}}return false;}}}} else {throw x.syntaxError("Misshaped tag");}}}}
}

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