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Jackson is a high-performance JSON processor (parser, generator)
There is a newer version: 0.9.5
package main;

import org.codehaus.jackson.*;

/**
 * Set of basic unit tests for verifying that the basic parser
 * functionality works as expected.
 */
public class TestCharEscaping
    extends BaseTest
{
    public void testMissingEscaping()
        throws Exception
    {
        // Invalid: control chars, including lf, must be escaped
        final String DOC = "["
            +"\"Linefeed: \n.\""
            +"]";
        JsonParser jp = createParserUsingReader(DOC);
        assertToken(JsonToken.START_ARRAY, jp.nextToken());
        try {
            // This may or may not trigger exception
            JsonToken t = jp.nextToken();
            assertToken(JsonToken.VALUE_STRING, t);
            // and if not, should get it here:
            jp.getText();
            fail("Expected an exception for un-escaped linefeed in string value");
        } catch (JsonParseException jex) {
            verifyException(jex, "has to be escaped");
        }
    }

    public void testSimpleEscaping()
        throws Exception
    {
        String DOC = "["
            +"\"LF=\\n\""
            +"]";

        JsonParser jp = createParserUsingReader(DOC);
        assertToken(JsonToken.START_ARRAY, jp.nextToken());
        assertToken(JsonToken.VALUE_STRING, jp.nextToken());
        assertEquals("LF=\n", jp.getText());
        jp.close();


        /* Note: must split Strings, so that javac won't try to handle
         * escape and inline null char
         */
        DOC = "[\"NULL:\\u0000!\"]";

        jp = createParserUsingReader(DOC);
        assertToken(JsonToken.START_ARRAY, jp.nextToken());
        assertToken(JsonToken.VALUE_STRING, jp.nextToken());
        assertEquals("NULL:\0!", jp.getText());

        // Then just a single char escaping
        jp = createParserUsingReader("[\"\\u0123\"]");
        assertToken(JsonToken.START_ARRAY, jp.nextToken());
        assertToken(JsonToken.VALUE_STRING, jp.nextToken());
        assertEquals("\u0123", jp.getText());

        // And then double sequence
        jp = createParserUsingReader("[\"\\u0041\\u0043\"]");
        assertToken(JsonToken.START_ARRAY, jp.nextToken());
        assertToken(JsonToken.VALUE_STRING, jp.nextToken());
        assertEquals("AC", jp.getText());
    }

    public void testInvalid()
        throws Exception
    {
        // 2-char sequences not allowed:
        String DOC = "[\"\\u41=A\"]";
        JsonParser jp = createParserUsingReader(DOC);
        assertToken(JsonToken.START_ARRAY, jp.nextToken());
        try {
            jp.nextToken();
            jp.getText();
            fail("Expected an exception for unclosed ARRAY");
        } catch (JsonParseException jpe) {
            verifyException(jpe, "for character escape");
        }
    }

    /**
     * Test to verify that decoder does not allow 8-digit escapes
     * (non-BMP characters must be escaped using two 4-digit sequences)
     */
    public void test8DigitSequence()
        throws Exception
    {
        String DOC = "[\"\\u00411234\"]";
        JsonParser jp = createParserUsingReader(DOC);
        assertToken(JsonToken.START_ARRAY, jp.nextToken());
        assertToken(JsonToken.VALUE_STRING, jp.nextToken());
        assertEquals("A1234", jp.getText());
    }
}