内容带分隔符的字符串分隔处理

我希望使用“;”字符分隔一个字符串的不同部分，如果字符串中包含;，使用\;进行转义，如：

引用

“aaa;” “b;b” “ccc”

这两个字符串连接起来即为：

引用

aaa\;;b\;b;ccc

StringSpliter指定分隔符和转义符，可将这样的字符串分隔出来：

public class StringSpliter {

    public static List<String> spliter(String content, char spliter, char escape) {
        if (!StringUtils.hasText(content)) {
            return Collections.EMPTY_LIST;
        } else {
            boolean hasPerEscape = false;

            List<String> items = Lists.newArrayList();
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < content.length(); i++) {
                char c = content.charAt(i);
                if (c == ' ' || c == '\t' || c == '\r' || c == '\n') {
                    if (hasPerEscape) {
                        sb.append(escape);
                        hasPerEscape = false;
                    }
                    continue;
                }

                if (c == escape) {
                    if (hasPerEscape) {
                        hasPerEscape = false;
                        sb.append(c);
                    } else {
                        hasPerEscape = true;
                    }
                } else if (c == spliter) {
                    if (hasPerEscape) {
                        sb.append(c);
                        hasPerEscape = false;
                    } else {
                        if (sb.length() > 0) {
                            items.add(sb.toString());
                            sb.delete(0, sb.length());
                        }
                    }
                } else {
                    sb.append(c);
                }
            }
            if (sb.length() > 0) {
                items.add(sb.toString());
            }
            return items;
        }
    }
}

单元测试：

public class StringSpliterTest {

    @Test
    public void testSplit(){
        String str1 = "aa;bb;cc";

        List<String> items = StringSpliter.spliter(str1, ';', '\\');
        assertNotNull(items);
        assertEquals(items.size(), 3);
        assertEquals(items.get(0), "aa");
        assertEquals(items.get(1),"bb");
        assertEquals(items.get(2),"cc");

        str1 = ";aa;bb;;;cc;";
        items = StringSpliter.spliter(str1, ';', '\\');
        assertNotNull(items);
        assertEquals(items.size(), 3);
        assertEquals(items.get(0), "aa");
        assertEquals(items.get(1),"bb");
        assertEquals(items.get(2),"cc");

        str1 = "a\\;a;bb\\;;\\;cc";
        items = StringSpliter.spliter(str1, ';', '\\');
        assertNotNull(items);
        assertEquals(items.size(), 3);
        assertEquals(items.get(0), "a;a");
        assertEquals(items.get(1),"bb;");
        assertEquals(items.get(2),";cc");

        str1 = "\\;;\\;";
        items = StringSpliter.spliter(str1, ';', '\\');
        assertNotNull(items);
        assertEquals(items.size(), 2);
        assertEquals(items.get(0), ";");
        assertEquals(items.get(1),";");

        str1 = ";;;;;";
        items = StringSpliter.spliter(str1, ';', '\\');
        assertNotNull(items);
        assertEquals(items.size(), 0);

        str1 = "\\ ; \\ ;";
        items = StringSpliter.spliter(str1, ';', '\\');
        assertNotNull(items);
        assertEquals(items.size(), 2);
        assertEquals(items.get(0), "\\");
        assertEquals(items.get(1),"\\");

        str1 = "aaa";
        items = StringSpliter.spliter(str1, ';', '\\');
        assertNotNull(items);
        assertEquals(items.size(), 1);
        assertEquals(items.get(0), "aaa");
    }
}

评论

1 楼 leoning12 2015-01-12  

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