java的.properties文件属性如何添加空格

有人教我们在空格前放一个斜杠 \ 表示转义。

http://stackoverflow.com/questions/11838674/how-to-read-property-name-with-spaces-in-java

/*

* Converts unicodes to encoded \uxxxx and writes out any of the

* characters in specialSaveChars with a preceding slash

*/

private String saveConvert(String theString, boolean escapeSpace) {

int len = theString.length()

StringBuffer outBuffer = new StringBuffer(len * 2)

for (int x = 0x <lenx++) {

char aChar = theString.charAt(x)

switch (aChar) {

case ' ':

if (x == 0 || escapeSpace)

outBuffer.append('\\')

outBuffer.append(' ')

break

case '\\':

outBuffer.append('\\')

outBuffer.append('\\')

break

case '\t':

outBuffer.append('\\')

outBuffer.append('t')

break

case '\n':

outBuffer.append('\\')

outBuffer.append('n')

break

case '\r':

outBuffer.append('\\')

outBuffer.append('r')

break

case '\f':

outBuffer.append('\\')

outBuffer.append('f')

break

default:

if ((aChar <0x0020) || (aChar >0x007e)) {

outBuffer.append('\\')

outBuffer.append('u')

outBuffer.append(toHex((aChar >>12) &0xF))

outBuffer.append(toHex((aChar >>8) &0xF))

outBuffer.append(toHex((aChar >>4) &0xF))

outBuffer.append(toHex(aChar &0xF))

} else {

if (specialSaveChars.indexOf(aChar) != -1)

outBuffer.append('\\')

outBuffer.append(aChar)

}

}

}

return outBuffer.toString()

}

/**

* Convert a nibble to a hex character

*

* @param nibble

*the nibble to convert.

*/

private static char toHex(int nibble) {

return hexDigit[(nibble &0xF)]

}

/** A table of hex digits */

private static final char[] hexDigit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E',

'F' }

public synchronized Object put(Object key, Object value) {

context.putOrUpdate(key.toString(), value.toString())

return super.put(key, value)

}

public synchronized Object put(Object key, Object value, String line) {

context.putOrUpdate(key.toString(), value.toString(), line)

return super.put(key, value)

}

public synchronized Object remove(Object key) {

context.remove(key.toString())

return super.remove(key)

}

class PropertiesContext {

private List commentOrEntrys = new ArrayList()

public List getCommentOrEntrys() {

return commentOrEntrys

}

public void addCommentLine(String line) {

commentOrEntrys.add(line)

}

public void putOrUpdate(PropertyEntry pe) {

remove(pe.getKey())

commentOrEntrys.add(pe)

}

public void putOrUpdate(String key, String value, String line) {

PropertyEntry pe = new PropertyEntry(key, value, line)

remove(key)

commentOrEntrys.add(pe)

}

public void putOrUpdate(String key, String value) {

PropertyEntry pe = new PropertyEntry(key, value)

int index = remove(key)

commentOrEntrys.add(index,pe)

}

public int remove(String key) {

for (int index = 0index <commentOrEntrys.size()index++) {

Object obj = commentOrEntrys.get(index)

if (obj instanceof PropertyEntry) {

if (obj != null) {

if (key.equals(((PropertyEntry) obj).getKey())) {

commentOrEntrys.remove(obj)

return index

}

}

}

}

return commentOrEntrys.size()

}

class PropertyEntry {

private String key

private String value

private String line

public String getLine() {

return line

}

public void setLine(String line) {

this.line = line

}

public PropertyEntry(String key, String value) {

this.key = key

this.value = value

}

/**

* @param key

* @param value

* @param line

*/

public PropertyEntry(String key, String value, String line) {

this(key, value)

this.line = line

}

public String getKey() {

return key

}

public void setKey(String key) {

this.key = key

}

public String getValue() {

return value

}

public void setValue(String value) {

this.value = value

}

public String toString() {

if (line != null) {

return line

}

if (key != null &&value != null) {

String k = saveConvert(key, true)

String v = saveConvert(value, false)

return k + "=" + v

}

return null

}

}

}

/**

* @param comment

*/

public void addComment(String comment) {

if (comment != null) {

context.addCommentLine("#" + comment)

}

}

}

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