update src/main/java/com/jfinal/captcha/Captcha.java.

src/main/java/com/jfinal/captcha/Captcha.java

@@ -74,14 +74,26 @@ public class Captcha implements Serializable {
 	public String getKey() {
 		return key;
 	}
+
+    public void setKey(String key) {
+		this.key = key;
+	}
 	
 	public String getValue() {
 		return value;
 	}
+
+    public void setValue(String value) {
+		this.value = value;
+	}
 	
 	public long getExpireAt() {
 		return expireAt;
 	}
+
+    public void setExpireAt(long expireAt) {
+		this.expireAt = expireAt;
+	}
 	
 	public boolean isExpired() {
 		return expireAt < System.currentTimeMillis();