IntelliJ IDEA 搭建一个比较完整的网站实例 11

在上一篇文章中，我们实现了向数据库中新增用户名和密码的最基本的操作。当然正式项目中是不可能用到这么简单的账户注册功能的。为了能够将功能变得稍微像样一些，还需要添加一些功能。比如说，将密码进行加密。

首先在com.yiibai.output包下新建一个名为md5的包，然后再包下新建一个名为MD5的类。代码如下：

package com.yiibai.output.md5;

import java.security.MessageDigest;

public class MD5 {
    private static final String hexDigIts[]=
            {"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"};
    public static String MD5Encode(String origin,String charsetname) {
        String resultString = null;
        resultString = new String(origin);
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            if (null==charsetname||"".equals(charsetname)){
                resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
            }else{
                resultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname)));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return resultString;
    }

    private static String byteArrayToHexString(byte b[]) {
        StringBuffer resutSb = new StringBuffer();
        for(int i=0;i<b.length;i++){
            resutSb.append(byteToHexString(b[i]));
        }
        return resutSb.toString();
    }

    private static String byteToHexString(byte b) {
        int n = b;
        if(n<0){
            n+=256;
        }
        int d1 = n/16;
        int d2 = n%16;
        return hexDigIts[d1] + hexDigIts[d2];
    }
}

然后，在spring-config.xml中将此类注册成一个bean:

<bean id="MD5" class="com.yiibai.output.md5.MD5"></bean>

修改CsvOutputGenerator文件，将password加密后，再传入数据库中。addUsers方法的代码如下所示：

@Override
    public boolean addUsers(String username,String password){
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext(new String[]{"spring-config.xml"});
        Address address = (AddressImpl)applicationContext.getBean("address");
        MD5 md5 = (MD5) applicationContext.getBean("MD5");
        String passwordMD5 =md5.MD5Encode(password,"utf8");
        UsersEntity usersEntity = new UsersEntity();
        usersEntity.setUsername(username);
        usersEntity.setPassword(passwordMD5);
        return address.addUsers(usersEntity);
    }

修改完成之后运行tomcat，输入用户名（dog)密码（123456），点击注册：

数据库中的数据：