Java 使用 Guava Util 实现驼峰、下划线互转

1 自定义代码实现

1.1 驼峰转下划线

// 自定义正则表达式
private static final Pattern HUMP_PATTERN = Pattern.compile("[A-Z0-9]");private String humpToLine(String str) {
    Matcher matcher = HUMP_PATTERN.matcher(str);StringBuffer sb = new StringBuffer();while (matcher.find()) {
    matcher.appendReplacement(sb, "_" + matcher.group(0).toLowerCase());}matcher.appendTail(sb);return sb.toString();
}

1.2 下划线转驼峰

private static final char UNDERLINE = '_';private String underlineToCamel(String param) {
    if (StringUtils.isBlank(param)) {
    return "";}int len = param.length();StringBuilder sb = new StringBuilder(len);for (int i = 0; i < len; i++) {
    char c = Character.toLowerCase(param.charAt(i));if (c == UNDERLINE) {
    if (++i < len) {
    sb.append(Character.toUpperCase(param.charAt(i)));}} else {
    sb.append(c);}}return sb.toString();
}

2 使用 Guava 实现

使用 Guava 的话需要 Maven 项目引入依赖

<dependency><groupId>com.google.guava</groupId><artifactId>guava</artifactId><version>21.0</version>
</dependency>

2.1 驼峰转下划线

import com.google.common.base.CaseFormat;
import lombok.extern.slf4j.Slf4j;
import org.junit.Test;@Slf4j
public class ConvertLineToHumpTest {
    @Testpublic void convertLineToHumpTest() {
    String resultStr = CaseFormat.LOWER_CAMEL.to(CaseFormat.LOWER_UNDERSCORE, "studentName");log.info(" >>> 驼峰转下划线 : {}", resultStr);}
}>>> 驼峰转下划线 : student_name

2.2 下划线转驼峰

import com.google.common.base.CaseFormat;
import lombok.extern.slf4j.Slf4j;
import org.junit.Test;@Slf4j
public class ConvertHumpToLineTest {
    @Testpublic void convertHumpToLineTest() {
    String resultStr = CaseFormat.LOWER_UNDERSCORE.to(CaseFormat.LOWER_CAMEL, "student_name");log.info(" >>> 下划线转驼峰 : {}", resultStr);}
}>>> 下划线转驼峰 : studentName

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