!8 $tool工具中增加hump2Underline(String str) 用于将驼峰字符串转下划线字符串

Merge pull request !8 from tangcent/feature/tool

src/main/java/com/sjhy/plugin/tool/NameUtils.java

@@ -38,7 +38,8 @@ public class NameUtils {
     /**
      * 转驼峰命名正则匹配规则
      */
-    private final Pattern TO_HUMP_PATTERN = Pattern.compile("[-_]([a-z0-9])");
+    private static final Pattern TO_HUMP_PATTERN = Pattern.compile("[-_]([a-z0-9])");
+    private static final Pattern TO_LINE_PATTERN = Pattern.compile("[A-Z]+");
 
     /**
      * 首字母大写方法
@@ -60,6 +61,29 @@ public class NameUtils {
         return StringUtils.uncapitalize(name);
     }
 
+    /**
+     * 驼峰转下划线，全小写
+     *
+     * @param str 驼峰字符串
+     * @return 下划线字符串
+     */
+    public String hump2Underline(String str) {
+        if (StringUtils.isEmpty(str)) {
+            return str;
+        }
+        Matcher matcher = TO_LINE_PATTERN.matcher(str);
+        StringBuffer buffer = new StringBuffer();
+        while (matcher.find()) {
+            if (matcher.start() > 0) {
+                matcher.appendReplacement(buffer, "_" + matcher.group(0).toLowerCase());
+            } else {
+                matcher.appendReplacement(buffer, matcher.group(0).toLowerCase());
+            }
+        }
+        matcher.appendTail(buffer);
+        return buffer.toString();
+    }
+
     /**
      * 通过java全名获取类名
      *

src/main/resources/description/templateDescription.html

@@ -45,6 +45,7 @@
         getClsNameByFullName(String fullName) 通过包全名获取类名
         getJavaName(String name) 将下划线分割字符串转驼峰命名(属性名)
         getClassName(String name) 将下划线分割字符串转驼峰命名(类名)
+        hump2Underline(String str) 将驼峰字符串转下划线字符串
         append(Object... objs) 多个数据进行拼接
         newHashSet(Object... objs) 创建一个HashSet对象
         newArrayList(Object... objs) 创建一个ArrayList对象

src/test/java/com/sjhy/plugin/tool/GlobalToolTest.java

@@ -0,0 +1,38 @@
+package com.sjhy.plugin.tool;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * GlobalTool相关测试
+ **/
+public class GlobalToolTest {
+
+    @Test
+    public void hump2Underline() {
+        GlobalTool tool = GlobalTool.getInstance();
+        String out;
+        //正常
+        System.out.println(out = tool.hump2Underline("asianInfrastructureInvestmentBank"));
+        Assert.assertEquals("asian_infrastructure_investment_bank", out);
+        //首字母大写
+        System.out.println(out = tool.hump2Underline("AsianInfrastructureInvestmentBank"));
+        Assert.assertEquals("asian_infrastructure_investment_bank", out);
+        //已经是下划线字符串
+        System.out.println(out = tool.hump2Underline("asian_infrastructure_investment_bank"));
+        Assert.assertEquals("asian_infrastructure_investment_bank", out);
+        //包含重复的大写字符
+        System.out.println(out = tool.hump2Underline("AAsianIInfrastructureInvestmentBank"));
+        Assert.assertEquals("aasian_iinfrastructure_investment_bank", out);
+        //空字符串
+        System.out.println(out = tool.hump2Underline(""));
+        Assert.assertEquals("", out);
+        //null
+        System.out.println(out = tool.hump2Underline(null));
+        Assert.assertEquals(null, out);
+        //全大写字符串
+        System.out.println(out = tool.hump2Underline("AASIANINFRASTRUCTUREINVESTMENTBANK"));
+        Assert.assertEquals("aasianinfrastructureinvestmentbank", out);
+    }
+
+}