如何转义属性文件中的等号

Question

How can I escape the equals sign ( = ) in Java property files? I would like to put something as the following in my file:

table.whereclause=where id=100

Answer 1

Moreover, Please refer to load(Reader reader) method from Property class on javadoc

In load(Reader reader) method documentation it says

The key contains all of the characters in the line starting with the first non-white space character and up to, but not including, the first unescaped '=' , ':' , or white space character other than a line terminator. All of these key termination characters may be included in the key by escaping them with a preceding backslash character; for example,

 \\:\\= 

would be the two-character key ":=". Line terminator characters can be included using \\r and \\n escape sequences. Any white space after the key is skipped; if the first non-white space character after the key is '=' or ':' , then it is ignored and any white space characters after it are also skipped. All remaining characters on the line become part of the associated element string; if there are no remaining characters, the element is the empty string "" . Once the raw character sequences constituting the key and element are identified, escape processing is performed as described above.

Hope that helps.

Answer 2

In your specific example you don't need to escape the equals - you only need to escape it if it's part of the key. The properties file format will treat all characters after the first unescaped equals as part of the value.

Answer 3

Default escape character in Java is '\\'.
However, Java properties file has format key=value, it should be considering everything after the first equal as value.

Answer 4

The best way to avoid this kind of issues it to build properties programmatically and then store them. For example, using code like this:

java.util.Properties props = new java.util.Properties();
props.setProperty("table.whereclause", "where id=100");
props.store(System.out, null);

This would output to System.out the properly escaped version.

In my case the output was:

#Mon Aug 12 13:50:56 EEST 2013
table.whereclause=where id\=100

As you can see, this is an easy way to generate content of .properties files that's guaranteed to be correct. And you can put as many properties as you want.

Answer 5

In my case, two leading '\\\\' working fine for me.

For example : if your word contains the '#' character (eg aa#100, you can escape it with two leading '\\\\'

  key= aa\\\\#100 

Answer 6

You can look here Can the key in a Java property include a blank character?

for escape equal '=' \=

table.whereclause=where id=100

key:[table.whereclause] value:[where id=100]

table.whereclause\=where id=100

key:[table.whereclause=where] value:[id=100]

table.whereclause\=where\ id\=100

key:[table.whereclause=where id=100] value:[]

Answer 7

In Spring or Spring boot application.properties file here is the way to escape the special characters;

table.whereclause=where id'\\='100

Answer 8

This method should help to programmatically generate values guaranteed to be 100% compatible with .properties files:

public static String escapePropertyValue(final String value) {
    if (value == null) {
        return null;
    }

    try (final StringWriter writer = new StringWriter()) {
        final Properties properties = new Properties();
        properties.put("escaped", value);
        properties.store(writer, null);
        writer.flush();

        final String stringifiedProperties = writer.toString();
        final Pattern pattern = Pattern.compile("(.*?)escaped=(.*?)" + Pattern.quote(System.lineSeparator()) + "*");
        final Matcher matcher = pattern.matcher(stringifiedProperties);

        if (matcher.find() && matcher.groupCount() <= 2) {
            return matcher.group(matcher.groupCount());
        }

        // This should never happen unless the internal implementation of Properties::store changed
        throw new IllegalStateException("Could not escape property value");
    } catch (final IOException ex) {
        // This should never happen. IOException is only because the interface demands it
        throw new IllegalStateException("Could not escape property value", ex);
    }
}

You can call it like this:

final String escapedPath = escapePropertyValue("C:\\Users\\X");
writeToFile(escapedPath); // will pass "C\\:\\\\Users\\\\X"

This method a little bit expensive but, writing properties to a file is typically an sporadic operation anyway.

Answer 9

I've been able to input values within the character ":

db_user="postgresql"
db_passwd="this,is,my,password"