Codec入门

Codec 提供了一些公共的编解码实现，比如Base64, Hex, MD5等等。

工具类

 package com.cxl.beanutil.util;

 import org.apache.commons.codec.binary.Base64;
 import org.apache.commons.codec.digest.DigestUtils;

 import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.UnsupportedEncodingException;

 /**
  *
  *Codec提供了一些公共的编码实现
  */
 public class Codec {

     /**
      * 计算字符串的MD5
      * @param str
      * @return
      */
     public static String strMD5(String str) {
         str = DigestUtils.md5Hex(str);
         System.out.println(str);
         return str;
     }

     /**
      * 文件的MD5
      * @param path
      * @return
      */
     public static String fileMD5(String path) {
         try {
             String str = DigestUtils.md5Hex(new FileInputStream(path));
             System.out.println(str);
             return str;
         } catch (IOException e) {
             e.printStackTrace();
         }
         return "";
     }

     /**
      * 编码
      * @param string
      * @return
      */
     public static String encode(String string) {
         Base64 base64 = new Base64();
         try {
             string = base64.encodeToString(string.getBytes("utf-8"));
             System.out.println("Base64 编码后：" + string);
         } catch (UnsupportedEncodingException e) {
             e.printStackTrace();
         }
         return string;
     }

     /**
      * 解码
      * @param string
      */
     public static void decode(String string) {
         Base64 base64 = new Base64();
         string = new String(base64.decode(string));
         System.out.println("Base 解码后：" + string);
     }
 }

测试类

 package com.cxl.beanutil.test;

 import com.cxl.beanutil.util.Codec;
 import com.sun.tools.javac.jvm.Code;

 /**
  * Created by chaixinli on 2017/9/26.
  */
 public class TestCodec {

     public static void main(String[] args) {
         Codec.encode("doudou");
         Codec.decode("ZG91ZG91");

         Codec.strMD5("doudou");
         Codec.fileMD5("/Users/doudou/Downloads/service.sh");
     }
 }

引入jar包

<!-- https://mvnrepository.com/artifact/commons-codec/commons-codec -->
    <dependency>
        <groupId>commons-codec</groupId>
        <artifactId>commons-codec</artifactId>
        <version>1.10</version>
    </dependency>