JSON压缩：JSONMinify

JSON压缩：JSONMinify

JSONMinify 2014-04-01 17:23:16 发布

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JSONMinify 移除了 JSON 或者 JSON+C（JSON+C = JSON with comments） 文档中的所有空白和注释，实现对 JSON 内容的最小化压缩。实现无开销和近乎完美的表现。这个包只有53行源码：

public class JSONMinify {
public static String minify(String jsonString) {
boolean in_string = false;
boolean in_multiline_comment = false;
boolean in_singleline_comment = false;
char string_opener = 'x'; // unused value, just something that makes compiler happy

StringBuilder out = new StringBuilder();
for (int i = 0; i < jsonString.length(); i++) {
// get next (c) and next-next character (cc)

char c = jsonString.charAt(i);
String cc = jsonString.substring(i, Math.min(i+2, jsonString.length()));

// big switch is by what mode we're in (in_string etc.)
if (in_string) {
if (c == string_opener) {
in_string = false;
out.append(c);
} else if (c == '\\') { // no special treatment needed for \\u, it just works like this too
out.append(cc);
++i;
} else
out.append(c);
} else if (in_singleline_comment) {
if (c == '\r' || c == '\n')
in_singleline_comment = false;
} else if (in_multiline_comment) {
if (cc.equals("*/")) {
in_multiline_comment = false;
++i;
}
} else {
// we're outside of the special modes, so look for mode openers (comment start, string start)
if (cc.equals("/*")) {
in_multiline_comment = true;
++i;
} else if (cc.equals("//")) {
in_singleline_comment = true;
++i;
} else if (c == '"' || c == '\'') {
in_string = true;
string_opener = c;
out.append(c);
} else if (!Character.isWhitespace(c))
out.append(c);
}
}
return out.toString();
}
}