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>