JAVA对象转换成XML(<![CDATA[文本内容]]>)

编者小结：将java对象转换成xml文件很简单，但是将java对象转换成<![CDATA[文本内容]]>输出结果不转义的形式就相当不易。大家都知道在XML 元素中，"<" 和 "&" 是非法的。"<" 会产生错误，因为解析器会把该字符解释为新元素的开始。"&" 也会产生错误，因为解析器会把该字符解释为字符实体的开始。某些文本，比如
JavaScript 代码，包含大量 "<" 或"&" 字符。为了避免错误，可以将脚本代码定义为 CDATA。
CDATA：在标记CDATA下，所有的标记、实体引用都被忽略，而被XML处理程序一视同仁地当作字符数据看待，CDATA的形式如下：
<![CDATA[文本内容]]>
CDATA的文本内容中不能出现字符串“]]>”，另外，CDATA不能嵌套。

具体实现过程如下：
Java实体类：

publicclassJavaDocu {

privateintid;

private String text;

publicint getId() {

returnid;

}

publicvoid setId(int id) {

this.id = id;

}

public String getText() {

returntext;

}

publicvoid setText(String text) {

this.text = text;

}

}

MyXppDriver类：

publicclassMyXppDriver extends XppDriver {

public HierarchicalStreamWritercreateWriter(Writer out){

returnnew MyPrettyPrintWriter(out);

}

}

MyPrettyPrintWriter类：

publicclassMyPrettyPrintWriterimplementsExtendedHierarchicalStreamWriter {

privatefinal QuickWriter writer;

privatefinal FastStack elementStack = new FastStack(16);

privatefinalchar[] lineIndenter;

privatebooleantagInProgress;

privateintdepth;

privatebooleanreadyForNewLine;

privatebooleantagIsEmpty;

privatestaticfinalchar[] AMP = "&".toCharArray();

privatestaticfinalchar[] LT = "<".toCharArray();

privatestaticfinalchar[] GT = ">".toCharArray();

privatestaticfinalchar[] SLASH_R = " ".toCharArray();

privatestaticfinalchar[] QUOT = """.toCharArray();

privatestaticfinalchar[] APOS = "'".toCharArray();

privatestaticfinalchar[] CLOSE = "</".toCharArray();

publicMyPrettyPrintWriter(Writer writer, char[] lineIndenter) {

this.writer = new QuickWriter(writer);

this.lineIndenter = lineIndenter;

}

publicMyPrettyPrintWriter(Writer writer, String lineIndenter) {

this(writer,lineIndenter.toCharArray());

}

public MyPrettyPrintWriter(PrintWriterwriter) {

this(writer, newchar[] { ' ', ' ' });

}

publicMyPrettyPrintWriter(Writer writer) {

this(new PrintWriter(writer));

}

@Override

publicvoid addAttribute(Stringkey, String value) {

writer.write(' ');

writer.write(key);

writer.write('=');

writer.write('\"');

writeAttributeValue(writer, value);

writer.write('\"');

}

protectedvoidwriteAttributeValue(QuickWriter writer, String text) {

int length = text.length();

for (int i = 0; i < length;i++) {

char c = text.charAt(i);

switch (c) {

case'&':

this.writer.write(AMP);

break;

case'<':

this.writer.write(LT);

break;

case'>':

this.writer.write(GT);

break;

case'"':

this.writer.write(QUOT);

break;

case'\'':

this.writer.write(APOS);

break;

case'\r':

this.writer.write(SLASH_R);

break;

default:

this.writer.write(c);

}

}

}

@Override

publicvoid endNode() {

depth--;

if (tagIsEmpty) {

writer.write('/');

readyForNewLine = false;

finishTag();

elementStack.popSilently();

}else{

finishTag();

writer.write(CLOSE);

writer.write((String) elementStack.pop());

writer.write('>');

}

readyForNewLine = true;

if (depth == 0) {

writer.flush();

}

}

@Override

publicvoid setValue(String text) {

readyForNewLine = false;

tagIsEmpty = false;

finishTag();

writeText(writer, text);

}

protectedvoid writeText(QuickWriterwriter, String text) {

int length = text.length();

StringCDATAPrefix = "<![CDATA[";

if(!text.startsWith(CDATAPrefix)) {

for (int i = 0; i < length;i++) {

char c = text.charAt(i);

switch (c) {

case'&':

this.writer.write(AMP);

break;

case'<':

this.writer.write(LT);

break;

case'>':

this.writer.write(GT);

break;

case'"':

this.writer.write(QUOT);

break;

case'\'':

this.writer.write(APOS);

break;

case'\r':

this.writer.write(SLASH_R);

break;

default:

this.writer.write(c);

}

}

}

else {

for (int i = 0; i < length;i++) {

char c = text.charAt(i);

this.writer.write(c);

}

}

}

@Override

publicvoid startNode(String name){

tagIsEmpty = false;

finishTag();

writer.write('<');

writer.write(name);

elementStack.push(name);

tagInProgress = true;

depth++;

readyForNewLine = true;

tagIsEmpty = true;

}

privatevoid finishTag() {

if (tagInProgress) {

writer.write('>');

}

tagInProgress = false;

if (readyForNewLine) {

endOfLine();

}

readyForNewLine = false;

tagIsEmpty = false;

}

protectedvoid endOfLine() {

writer.write('\n');

for (int i = 0; i < depth; i++) {

writer.write(lineIndenter);

}

}

publicvoid flush() {

writer.flush();

}

publicvoid close() {

writer.close();

}

@Override

publicHierarchicalStreamWriter underlyingWriter() {

returnthis;

}

@Override

publicvoid startNode(String name, @SuppressWarnings("rawtypes")Class arg1) {

// TODO Auto-generated method stub

tagIsEmpty = false;

finishTag();

writer.write('<');

writer.write(name);

elementStack.push(name);

tagInProgress = true;

depth++;

readyForNewLine = true;

tagIsEmpty = true;

}

}

Java测试类：

publicclassJavaDocuTest {

publicstaticvoid main(String[] args) throws IOException,JAXBException {

Long t1 = System.currentTimeMillis();

StringCDATAPrefix = "<![CDATA[";

StringCDATABackfix = "]]>";

JavaDocujavadocu = newJavaDocu();

JavaDocujavadocu2 = newJavaDocu();

javadocu.setText(CDATAPrefix+ "这是一个测试" + CDATABackfix);

javadocu2.setText(CDATAPrefix+ "这又是一个测试" + CDATABackfix);

List<JavaDocu>list = newArrayList<JavaDocu>();

list.add(javadocu);

list.add(javadocu2);

XStreamxstream = newXStream(newMyXppDriver());

for (int i = 0; i <list.size(); i++) {

list.get(i).setId(i);

xstream.alias("javatoxml",JavaDocu.class);

xstream.useAttributeFor(JavaDocu.class, "id");

// xstream.useAttributeFor("id",String.class);

}

System.out.println(xstream.toXML(list));

xstream.toXML(list, new PrintWriter("c:\\测试.xml", "utf-8"));

}

}

以上代码可实现将javabean转换成包含<![CDATA[文本内容]]>的xml文件。

温馨提示：此过程使用xstream.1.3.1.jar，请到http://download.csdn.net/detail/yaohucaizi/5120422下载所需jar包（免费）。

本文原创yhcz
由于总结过程实属不易如需转载请注明出处，谢谢！