1. 程式人生 > >java 讀取,修改properties檔案,不改變檔案內容順序

java 讀取,修改properties檔案,不改變檔案內容順序

   FileInputStream input1 = new FileInputStream("/jdbc.properties");//讀取程式碼
        SafeProperties safeProp1 = new SafeProperties();
        safeProp1.load(input1);
        String safe= safeProp1.getProperty("url"); 

       
         input1.close();
 FileInputStream input = new FileInputStream("sso.properties");//修改程式碼
        SafeProperties safeProp = new SafeProperties();
        safeProp.load(input);
        input.close();
        safeProp.setProperty("sso.server.urlprefix","測試");
 
        FileOutputStream output = new FileOutputStream("sso.properties");
        safeProp.store(output, null);
        output.close();
重寫Properties類


import java.io.*;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;

/**
 * Created by 31767 on 2017/8/8.
 */

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) {
             String line = in.readLine();
             String intactLine = line;
            if (line == null)
                return;

            if (line.length() > 0) {

                 int len = line.length();
                int keyStart;
                for (keyStart = 0; keyStart < len; keyStart++)
                    if (whiteSpaceChars.indexOf(line.charAt(keyStart)) == -1)
                        break;

                 if (keyStart == len)
                    continue;

                 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);
                         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();
                    }

                     int separatorIndex;
                    for (separatorIndex = keyStart; separatorIndex < len; separatorIndex++) {
                        char currentChar = line.charAt(separatorIndex);
                        if (currentChar == '\\')
                            separatorIndex++;
                        else if (keyValueSeparators.indexOf(currentChar) != -1)
                            break;
                    }

                     int valueIndex;
                    for (valueIndex = separatorIndex; valueIndex < len; valueIndex++)
                        if (whiteSpaceChars.indexOf(line.charAt(valueIndex)) == -1)
                            break;

                     if (valueIndex < len)
                        if (strictKeyValueSeparators.indexOf(line.charAt(valueIndex)) != -1)
                            valueIndex++;

                     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) : "";

                     key = loadConvert(key);
                    value = loadConvert(value);
                     put(key, value, intactLine);
                } else {
                     context.addCommentLine(intactLine);
                }
            } else {
                 context.addCommentLine(intactLine);
            }
        }
    }

   
    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'); /* 
[email protected]
*/ else if (aChar == 'r') outBuffer.append('\r'); /* [email protected] */ else if (aChar == 'n') { /* * [email protected] 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'); /*
[email protected]
[email protected] */ } else if (aChar == 'f') outBuffer.append('\f'); /* [email protected] */ else /* [email protected] */ outBuffer.append(aChar); /* [email protected] */ } } 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 int 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; } } } public void addComment(String comment) { if (comment != null) { context.addCommentLine("#" + comment); } } }


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