Gson Unicode字符转换为Unicode字符代码

在下面查看我的代码。我有一个包含Unicode字符代码的JSON字符串。我将其转换为Java对象,然后将其转换回JSON字符串。但是,您可以看到输入和输出JSON字符串不匹配。是否可以使用Gson将我的对象转换为原始JSON字符串?我想outputJson和一样inputJson

static class Book {

String description;

}

public static void test() {

Gson gson = new Gson();

String inputJson = "{\"description\":\"Tikrovi\\u0161kai para\\u0161ytas k\\u016brinys\"}";

Book book = gson.fromJson(inputJson, Book.class);

String outputJson = gson.toJson(book);

System.out.println(inputJson);

System.out.println(outputJson);

// Prints:

// {"description":"Tikrovi\u0161kai para\u0161ytas k\u016brinys"}

// {"description":"Tikroviškai parašytas kūrinys"}

}

回答:

不幸的是,Gson似乎不支持它。所有JSON输入/输出分别集中在Gson(从2.8.0开始)JsonReaderJsonWriterJsonReader可以使用其私有readEscapeCharacter方法读取Unicode转义。但是,与有所不同的是JsonReaderJsonWriter只需将字符串写入后备Writer实例,除了\u2028和以外,不对127以上的字符进行字符校正\u2029。可能唯一可以做的是编写自定义转义符,Writer以便发出Unicode转义。

final class EscapedWriter

extends Writer {

private static final char[] hex = {

'0', '1', '2', '3',

'4', '5', '6', '7',

'8', '9', 'a', 'b',

'c', 'd', 'e', 'f'

};

private final Writer writer;

// I/O components are usually implemented in not thread-safe manner

// so we can save some time on constructing a single UTF-16 escape

private final char[] escape = { '\\', 'u', 0, 0, 0, 0 };

EscapedWriter(final Writer writer) {

this.writer = writer;

}

// This implementation is not very efficient and is open for enhancements:

// * constructing a single "normalized" buffer character array so that it could be passed to the downstream writer

// rather than writing characters one by one

// * etc...

@Override

public void write(final char[] buffer, final int offset, final int length)

throws IOException {

for ( int i = offset; i < length; i++ ) {

final int ch = buffer[i];

if ( ch < 128 ) {

writer.write(ch);

} else {

escape[2] = hex[(ch & 0xF000) >> 12];

escape[3] = hex[(ch & 0x0F00) >> 8];

escape[4] = hex[(ch & 0x00F0) >> 4];

escape[5] = hex[ch & 0x000F];

writer.write(escape);

}

}

}

@Override

public void flush()

throws IOException {

writer.flush();

}

@Override

public void close()

throws IOException {

writer.close();

}

// Some java.io.Writer subclasses may use java.lang.Object.toString() to materialize their accumulated state by design

// so it has to be overridden and forwarded as well

@Override

public String toString() {

return writer.toString();

}

}

该作家未经充分测试,不尊重\u2028\u2029。然后只需在调用toJson方法时配置输出目标即可:

final String input = "{\"description\":\"Tikrovi\\u0161kai para\\u0161ytas k\\u016brinys\"}";

final Book book = gson.fromJson(input, Book.class);

final Writer output = new EscapedWriter(new StringWriter());

gson.toJson(book, output);

System.out.println(input);

System.out.println(output);

输出:

{“描述”:“ Tikrovi \ u016​​1ytas k \ u016​​brinys”}

这是一个有趣的问题,您可能还会在google /

gson上提出一个问题,以添加字符串编写配置选项-

或至少从开发团队那里获得一些意见。我确实相信他们非常了解这种行为,并通过设计使它像这样工作,但是他们也可以对此有所了解(我现在唯一想到的是,他们目前有更多的性能,无法再增加在编写字符串之前进行转换,但这是一个微不足道的猜测)。

以上是 Gson Unicode字符转换为Unicode字符代码 的全部内容, 来源链接: utcz.com/qa/423387.html

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