修改MQ请求尸体，防止出错

yzg-util-base/src/main/java/com/yanzuoguang/util/helper/StringHelper.java

@@ -108,6 +108,34 @@ public class StringHelper {
         return str.toString();
     }
 
+    /**
+     * 取左边
+     *
+     * @param from
+     * @param size
+     * @return
+     */
+    public static String left(String from, int size) {
+        if (from != null) {
+            return from.substring(0, Math.min(from.length(), size));
+        }
+        return StringHelper.EMPTY;
+    }
+
+    /**
+     * 取右边
+     *
+     * @param from
+     * @param size
+     * @return
+     */
+    public static String right(String from, int size) {
+        if (from != null) {
+            return from.substring(Math.max(from.length() - size, 0));
+        }
+        return StringHelper.EMPTY;
+    }
+
 
     /**
      * 传入很多值，返回第一个不等于排除值、空值的值，当全部为排除值时，返回默认值

yzg-util-base/src/test/java/helper/TestStringHelper.java

+package helper;
+
+import com.yanzuoguang.util.helper.StringHelper;
+import org.junit.Test;
+
+public class TestStringHelper {
+    @Test
+    public void test() {
+        System.out.println(StringHelper.left("100500103", 3));
+        System.out.println(StringHelper.left("10", 3));
+        System.out.println(StringHelper.right("100500103", 3));
+        System.out.println(StringHelper.right("03", 3));
+    }
+
+}