添加StringBuilderHolder，可重用的StringBuilder（及其char[]），可配合ThreadLocal使用

2015-12-07 21:42:57 +08:00
parent 57362ffcbc
commit 50f76a2e82
1 changed files with 38 additions and 0 deletions
@@ -0,0 +1,38 @@
+package org.springside.modules.utils;
+
+/**
+ * 参考BigDecimal, 可重用的StringBuilder, 节约StringBuilder内部的char[]
+ * 
+ * 参考下面的示例代码将其保存为ThreadLocal.
+ * 
+ * <pre>
+ * private static final ThreadLocal<StringBuilderHelper> threadLocalStringBuilderHolder = new ThreadLocal<StringBuilderHelper>() {
+ * 	&#64;Override
+ * 	protected StringBuilderHelper initialValue() {
+ * 		return new StringBuilderHelper(256);
+ * 	}
+ * };
+ * 
+ * StringBuilder sb = threadLocalStringBuilderHolder.get().resetAndGetStringBuilder();
+ * 
+ * </pre>
+ * 
+ * @author calvin
+ *
+ */
+public class StringBuilderHolder {
+
+	private final StringBuilder sb;
+
+	public StringBuilderHolder(int capacity) {
+		sb = new StringBuilder(capacity);
+	}
+
+	/**
+	 * 重置StringBuilder内部的writerIndex, 而char[]保留不动.
+	 */
+	public StringBuilder resetAndGetStringBuilder() {
+		sb.setLength(0);
+		return sb;
+	}
+}