1

src/main/java/com/egolm/common/StringUtil.java

@@ -8,11 +8,15 @@ import java.io.PrintWriter;
 import java.io.Reader;
 import java.io.Writer;
 import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Comparator;
 import java.util.Date;
 import java.util.List;
 import java.util.Map;
+import java.util.Map.Entry;
+import java.util.TreeMap;
 import java.util.UUID;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -1015,5 +1019,46 @@ public class StringUtil {
 		}
 		return "";
 	}
-	 
+	
+	/**
+	 * 
+	 * @Title: doMD5Sign   
+	 * @Description: TODO(这里用一句话描述这个方法的作用)   
+	 * @param: @param map
+	 * @param: @return      
+	 * @return: String      
+	 * @throws
+	 */
+	public static String doMD5Sign(Map<String, String> map){
+		Map<String, String> compMap = new TreeMap<String, String>(
+                new Comparator<String>() {
+                    public int compare(String obj1, String obj2) {
+                        return obj1.compareTo(obj2);
+                    }
+                });
+		for(Entry<String, String> entry : map.entrySet()){
+			compMap.put(entry.getKey(), entry.getValue());
+		}
+		StringBuffer sb = new StringBuffer();
+		for(Entry<String, String> entry : compMap.entrySet()){
+			sb.append("&");
+			sb.append(entry.getKey());
+			sb.append("=");
+			sb.append(entry.getValue());
+		}
+		String s = sb.toString().substring(1);
+		 byte[] secretBytes = null;
+		try {
+			secretBytes = MessageDigest.getInstance("MD5").digest(s.getBytes());
+		} catch (NoSuchAlgorithmException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		}
+		String sign = Hex.encodeHexString(secretBytes).toUpperCase();
+		return sign;
+	}
+	
+	public static String getRandom(int num){
+		return String.valueOf(Math.random()).substring(2, 2+num);
+	}
 }