在调整应用程序时，我发现这个例程去除 CDATA 标记的 XML 字符串并用字符引用替换某些字符，以便可以在 HTML 页面中显示这些字符。
例行公事不够完美；如果 XML 有问题，它将留下尾随空格并会因 StringOutOfBounds 异常而中断。
当我开始处理路由时，我创建了一些单元测试，但目前的功能可以改进，所以这些可以提供更多参考。
出于理智的原因，例程需要重构。但是，我需要修复这个程序的真正原因是为了提高性能。它已成为应用程序中严重的性能瓶颈。
package engine;
import junit.framework.Assert;
import junit.framework.TestCase;
public class StringFunctionsTest extends TestCase {
public void testEscapeXMLSimple(){
final String simple = "<xml><SvcRsData>a<![CDATA[<sender>John & Smith</sender>]]></SvcRsData></xml> ";
final String expected = "<xml><SvcRsData>a<sender>John & Smith</sender></SvcRsData></xml> ";
String result = StringFunctions.escapeXML(simple);
Assert.assertTrue(result.equals(expected));
}
public void testEscapeXMLCDATAInsideCDATA(){
final String stringWithCDATAInsideCDATA = "<xml><SvcRsData>a<![CDATA[<sender>John <![CDATA[Inner & CD ]]>& Smith</sender>]]></SvcRsData></xml> ";
final String expected = "<xml><SvcRsData>a<sender>John <![CDATA[Inner & CD & Smith</sender>]]></SvcRsData></xml> ";
String result = StringFunctions.escapeXML(stringWithCDATAInsideCDATA);
Assert.assertTrue(result.equals(expected));
}
public void testEscapeXMLCDATAWithoutClosingTag(){
final String stringWithCDATAWithoutClosingTag = "<xml><SvcRsData>a<![CDATA[<sender>John & Smith</sender></SvcRsData></xml> ";
try{
String result = StringFunctions.escapeXML(stringWithCDATAWithoutClosingTag);
}catch(StringIndexOutOfBoundsException exception){
Assert.assertNotNull(exception);
}
}
public void testEscapeXMLCDATAWithTwoCDATAClosingTags(){
final String stringWithCDATAWithTwoClosingTags = "<xml><SvcRsData>a<![CDATA[<sender>John Inner & CD ]]>& Smith</sender>]]>bcd & efg</SvcRsData></xml> ";
final String expectedAfterSecondClosingTagNotEscaped = "<xml><SvcRsData>a<sender>John Inner & CD & Smith</sender>]]>bcd & efg</SvcRsData></xml> ";
String result = StringFunctions.escapeXML(stringWithCDATAWithTwoClosingTags);
Assert.assertTrue(result.equals(expectedAfterSecondClosingTagNotEscaped));
}
public void testEscapeXMLSimpleTwoCDATA(){
final String stringWithTwoCDATA = "<xml><SvcRsData>a<![CDATA[<sender>John & Smith</sender>]]>abc<sometag>xyz</sometag><sometag2><![CDATA[<recipient>Gorge & Doe</recipient>]]></sometag2></SvcRsData></xml> ";
final String expected = "<xml><SvcRsData>a<sender>John & Smith</sender>abc<sometag>xyz</sometag><sometag2><recipient>Gorge & Doe</recipient></sometag2></SvcRsData></xml> ";
String result = StringFunctions.escapeXML(stringWithTwoCDATA);
Assert.assertTrue(result.equals(expected));
}
public void testEscapeXMLOverlappingCDATA(){
final String stringWithTwoCDATA = "<xml><SvcRsData>a<![CDATA[<sender>John & <![CDATA[Smith</sender>]]>abc<sometag>xyz</sometag><sometag2><recipient>Gorge & Doe</recipient>]]></sometag2></SvcRsData></xml> ";
final String expectedMess = "<xml><SvcRsData>a<sender>John & <![CDATA[Smith</sender>abc<sometag>xyz</sometag><sometag2><recipient>Gorge & Doe</recipient>]]></sometag2></SvcRsData></xml> ";
String result = StringFunctions.escapeXML(stringWithTwoCDATA);
Assert.assertTrue(result.equals(expectedMess));
}
}
这是功能：
package engine;
public class StringFunctions {
public static String escapeXML(String s) {
StringBuffer result = new StringBuffer();
int stringSize = 0;
int posIniData = 0, posFinData = 0, posIniCData = 0, posFinCData = 0;
String stringPreData = "", stringRsData = "", stringPosData = "", stringCData = "", stringPreCData = "", stringTempRsData = "";
String stringNewRsData = "", stringPosCData = "", stringNewCData = "";
short caracter;
stringSize = s.length();
posIniData = s.indexOf("<SvcRsData>");
if (posIniData > 0) {
posIniData = posIniData + 11;
posFinData = s.indexOf("</SvcRsData>");
stringPreData = s.substring(0, posIniData);
stringRsData = s.substring(posIniData, posFinData);
stringPosData = s.substring(posFinData, stringSize);
stringTempRsData = stringRsData;
posIniCData = stringRsData.indexOf("<![CDATA[");
if (posIniCData > 0) {
while (posIniCData > 0) {
posIniCData = posIniCData + 9;
posFinCData = stringTempRsData.indexOf("]]>");
stringPreCData = stringTempRsData.substring(0,
posIniCData - 9);
stringCData = stringTempRsData.substring(posIniCData,
posFinCData);
stringPosCData = stringTempRsData.substring(
posFinCData + 3, stringTempRsData.length());
stringNewCData = replaceCharacter(stringCData);
stringTempRsData = stringTempRsData.substring(
posFinCData + 3, stringTempRsData.length());
stringNewRsData = stringNewRsData + stringPreCData
+ stringNewCData;
posIniCData = stringTempRsData.indexOf("<![CDATA[");
}
} else {
stringNewRsData = stringRsData;
}
stringNewRsData = stringNewRsData + stringPosCData;
s = stringPreData + stringNewRsData + stringPosData;
stringSize = s.length();
}
for (int i = 0; i < stringSize; i++) {
caracter = (short) s.charAt(i);
if (caracter > 128) {
result.append("&#");
result.append(caracter);
result.append(';');
} else {
result.append((char) caracter);
}
}
return result.toString();
}
private static String replaceCharacter(String s) {
StringBuffer result = new StringBuffer();
int stringSize = s.length();
short caracter;
for (int i = 0; i < stringSize; i++) {
caracter = (short) s.charAt(i);
if (caracter > 128 || caracter == 34 || caracter == 38
|| caracter == 60 || caracter == 62) {
result.append("&#");
result.append(caracter);
result.append(';');
} else {
result.append((char) caracter);
}
}
return result.toString();
}
}