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src/main/java/com/nis/util/MD5Utils.java

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+/**
+ * Copyright &copy; 2012-2014 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved.
+ */
+package com.nis.util;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.UnsupportedEncodingException;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.List;
+import java.util.Locale;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import javax.servlet.http.HttpServletRequest;
+
+import org.apache.commons.lang3.StringEscapeUtils;
+import org.springframework.web.context.request.RequestContextHolder;
+import org.springframework.web.context.request.ServletRequestAttributes;
+import org.springframework.web.servlet.LocaleResolver;
+
+import com.ckfinder.connector.ServletContextFactory;
+import com.google.common.collect.Lists;
+import com.nis.web.service.SpringContextHolder;
+
+/**
+ * 字符串工具类, 继承org.apache.commons.lang3.StringUtils类
+ * @author ThinkGem
+ * @version 2013-05-22
+ */
+public class MD5Utils{
+	
+	/**
+	 * 字符串转为MD532位小写
+	 * @param plain
+	 * @return
+	 */
+	public static String md5LowerCase(String plain) throws Exception{
+		String re_md5 = new String();
+			MessageDigest md = MessageDigest.getInstance("MD5");
+			md.update(plain.getBytes());
+			byte b[] = md.digest();
+		
+			int i;
+		
+			StringBuffer buf = new StringBuffer("");
+			for (int offset = 0; offset < b.length; offset++) {
+			i = b[offset];
+			if (i < 0)
+			i += 256;
+			if (i < 16)
+			buf.append("0");
+			buf.append(Integer.toHexString(i));
+			}
+			
+			re_md5 = buf.toString();
+			return re_md5;
+		}
+	public static byte[] createChecksum(String filename) throws IOException, NoSuchAlgorithmException{
+		InputStream fis=new FileInputStream(filename);
+		byte[] buffer=new byte[1024];
+		MessageDigest complete=MessageDigest.getInstance("MD5");
+		int numRead;
+		do{
+			numRead=fis.read(buffer);
+			if(numRead>0){
+				complete.update(buffer,0,numRead);
+			}
+		}while(numRead!=-1);
+		fis.close();
+		return complete.digest();
+	}
+	public static String getMD5Checksum(String filename) throws NoSuchAlgorithmException, IOException{
+		byte[] b=createChecksum(filename);
+		StringBuffer result=new StringBuffer();
+		for(int i=0;i<b.length;i++){
+			result.append(Integer.toString((b[i] & 0xff)+ 0x100,16).substring(1));
+		}
+		return result.toString();
+	}
+}