java修改Properties文件,让输出格式与输入格式保持不变
?
?
?
在方法中调用
?
?
?
FileInputStream input =?new?FileInputStream("e:/input.properties");
???????SafeProperties safeProp =?new?SafeProperties();
???????safeProp.load(input);
???????input.close();
???????safeProp.addComment("New Comment");
???????safeProp.put("New-Key",?"New====Value");
???????FileOutputStream output =?new?FileOutputStream("e:/output.properties");
???????safeProp.store(output,?null);
???????output.close();?
?
?
?
---------------------------------------------?SafeProperties类内容------------------------
?
?
?
?
?
?
?
?
?
?
?
?
?
package com.jianrc.util;
?
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
?
public class SafeProperties extends Properties {
private static final long serialVersionUID = 5011694856722313621L;
?
private static final String keyValueSeparators = "=: \t\r\n\f";
?
private static final String strictKeyValueSeparators = "=:";
?
private static final String specialSaveChars = "=: \t\r\n\f#!";
?
private static final String whiteSpaceChars = " \t\r\n\f";
?
private PropertiesContext context = new PropertiesContext();
?
public PropertiesContext getContext() {
return context;
}
?
public synchronized void load(InputStream inStream) throws IOException {
?
BufferedReader in;
?
in = new BufferedReader(new InputStreamReader(inStream, "8859_1"));
while (true) {
// Get next line
String line = in.readLine();
// intract property/comment string
String intactLine = line;
if (line == null)
return;
?
if (line.length() > 0) {
?
// Find start of key
int len = line.length();
int keyStart;
for (keyStart = 0; keyStart < len; keyStart++)
if (whiteSpaceChars.indexOf(line.charAt(keyStart)) == -1)
break;
?
// Blank lines are ignored
if (keyStart == len)
continue;
?
// Continue lines that end in slashes if they are not comments
char firstChar = line.charAt(keyStart);
?
if ((firstChar != '#') && (firstChar != '!')) {
while (continueLine(line)) {
String nextLine = in.readLine();
intactLine = intactLine + "\n" + nextLine;
if (nextLine == null)
nextLine = "";
String loppedLine = line.substring(0, len - 1);
// Advance beyond whitespace on new line
int startIndex;
for (startIndex = 0; startIndex < nextLine.length(); startIndex++)
if (whiteSpaceChars.indexOf(nextLine.charAt(startIndex)) == -1)
break;
nextLine = nextLine.substring(startIndex, nextLine.length());
line = new String(loppedLine + nextLine);
len = line.length();
}
?
// Find separation between key and value
int separatorIndex;
for (separatorIndex = keyStart; separatorIndex < len; separatorIndex++) {
char currentChar = line.charAt(separatorIndex);
if (currentChar == '\\')
separatorIndex++;
else if (keyValueSeparators.indexOf(currentChar) != -1)
break;
}
?
// Skip over whitespace after key if any
int valueIndex;
for (valueIndex = separatorIndex; valueIndex < len; valueIndex++)
if (whiteSpaceChars.indexOf(line.charAt(valueIndex)) == -1)
break;
?
// Skip over one non whitespace key value separators if any
if (valueIndex < len)
if (strictKeyValueSeparators.indexOf(line.charAt(valueIndex)) != -1)
valueIndex++;
?
// Skip over white space after other separators if any
while (valueIndex < len) {
if (whiteSpaceChars.indexOf(line.charAt(valueIndex)) == -1)
break;
valueIndex++;
}
String key = line.substring(keyStart, separatorIndex);
String value = (separatorIndex < len) ? line.substring(valueIndex, len) : "";
?
// Convert then store key and value
key = loadConvert(key);
value = loadConvert(value);
//memorize the property also with the whold string
put(key, value, intactLine);
} else {
//memorize the comment string
context.addCommentLine(intactLine);
}
} else {
//memorize the string even the string is empty
context.addCommentLine(intactLine);
}
}
}
?
/*
* Converts encoded \uxxxx to unicode chars and changes special saved
* chars to their original forms
*/
private String loadConvert(String theString) {
char aChar;
int len = theString.length();
StringBuffer outBuffer = new StringBuffer(len);
?
for (int x = 0; x < len;) {
aChar = theString.charAt(x++);
if (aChar == '\\') {
aChar = theString.charAt(x++);
if (aChar == 'u') {
// Read the xxxx
int value = 0;
for (int i = 0; i < 4; i++) {
aChar = theString.charAt(x++);
switch (aChar) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
value = (value << 4) + aChar - '0';
break;
case 'a':
case 'b':
case 'c':
case 'd':
case 'e':
case 'f':
value = (value << 4) + 10 + aChar - 'a';
break;
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
value = (value << 4) + 10 + aChar - 'A';
break;
default:
throw new IllegalArgumentException("Malformed \\uxxxx encoding.");
}
}
outBuffer.append((char) value);
} else {
if (aChar == 't')
outBuffer.append('\t'); /* ibm@7211 */
?
else if (aChar == 'r')
outBuffer.append('\r'); /* ibm@7211 */
else if (aChar == 'n') {
/*
* ibm@8897 do not convert a \n to a line.separator
* because on some platforms line.separator is a String
* of "\r\n". When a Properties class is saved as a file
* (store()) and then restored (load()) the restored
* input MUST be the same as the output (so that
* Properties.equals() works).
*?
*/
outBuffer.append('\n'); /* ibm@8897 ibm@7211 */
} else if (aChar == 'f')
outBuffer.append('\f'); /* ibm@7211 */
else
/* ibm@7211 */
outBuffer.append(aChar); /* ibm@7211 */
}
} else
outBuffer.append(aChar);
}
return outBuffer.toString();
}
?
public synchronized void store(OutputStream out, String header) throws IOException {
BufferedWriter awriter;
awriter = new BufferedWriter(new OutputStreamWriter(out, "8859_1"));
if (header != null)
writeln(awriter, "#" + header);
List entrys = context.getCommentOrEntrys();
for (Iterator iter = entrys.iterator(); iter.hasNext();) {
Object obj = iter.next();
if (obj.toString() != null) {
writeln(awriter, obj.toString());
}
}
awriter.flush();
}
?
private static void writeln(BufferedWriter bw, String s) throws IOException {
bw.write(s);
bw.newLine();
}
?
private boolean continueLine(String line) {
int slashCount = 0;
int index = line.length() - 1;
while ((index >= 0) && (line.charAt(index--) == '\\'))
slashCount++;
return (slashCount % 2 == 1);
}
?
/*
* 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 = 0; x < len; x++) {
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 void remove(String key) {
? ? ? ? ? ? ? ? ? ? for (int index = 0; index < 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 string
*/
public void addComment(String comment) {
if (comment != null) {
context.addCommentLine("#" + comment);
}
}
?
}