我要评论实现结果：
转换短链接api：
接口：http://127.0.0.1/api?url=urlencode('要缩短的网址')
例如：http://127.0.0.1/api?url=http%3a%2f%2fwww.baidu.com
返回：http://127.0.0.1/baidu
访问短链接即可还原原url；
转换原理： 将原url通过一系列方式，转换成6位短码（只要能不重复，随便怎么方式都行）；将长短链接存入数据库，形成一条对应关系；访问短链接的时候，在数据库找到对应的长链接，并通过重定向实现原url的访问；（如果你的转换方式能过还原，也可以不要数据库，但必须保证转换后的短码不能重复）
实现步骤：
1.创建数据库（shorturl），创建一个表，存储长链接和与之对应的短链接；
create table `link` ( `id` int(11) not null auto_increment comment '主键', `long_url` varchar(500) default null comment '长链接', `short_url` varchar(255) default null comment '短链接', primary key (`id`) ) engine=myisam auto_increment=6 default charset=utf8;
2.搭建springboot项目，搭建方式网上很多，自行查找；下图是项目构建完成的项目结构（public可以忽略）：
3.逻辑层代码依次是：
entity:
package com.tips.entity;
public class link {
private integer id;
private string longurl;
private string shorturl;
public integer getid() {
return id;
}
public void setid(integer id) {
this.id = id;
}
public string getlongurl() {
return longurl;
}
public void setlongurl(string longurl) {
this.longurl = longurl;
}
public string getshorturl() {
return shorturl;
}
public void setshorturl(string shorturl) {
this.shorturl = shorturl;
}
}
dao:
package com.tips.mapper;
import com.tips.entity.link;
import org.apache.ibatis.annotations.mapper;
@mapper
public interface linkmapper {
link selectbyprimarykey(integer id);
int insert(link link);
link findbylongurl(string longurl);
string findbyshorturl(string shorturl);
}
service:
package com.tips.service;
import com.tips.entity.link;
public interface linkservice {
string save(link link);
string restoreurl(string url);
}
service.impl:
package com.tips.service.impl;
import com.tips.entity.link;
import com.tips.mapper.linkmapper;
import com.tips.service.linkservice;
import com.tips.util.md5util;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.stereotype.service;
@service
public class linkserviceimpl implements linkservice{
@autowired
private linkmapper linkmapper;
/**
* 转化url
* 查询数据库是否已经存在 如果存在就返回数据库对应的短链接，如果不存在就查询一条新纪录并返回新的短链接
* <strong>@param </strong>link
* <strong>@return
</strong><strong> </strong>*/
@override
public string save(link link) {
string shorturl = "http://127.0.0.1/";
string longurl = link.getlongurl();
system.out.println(longurl);
link link1 = linkmapper.findbylongurl(longurl);
if(link1 == null) {
shorturl += this.gererateshorturl(longurl);
link.setshorturl(shorturl);
linkmapper.insert(link);
}else{
shorturl = link1.getshorturl();
}
return shorturl;
}
@override
public string restoreurl(string url) {
return linkmapper.findbyshorturl(url);
}
/**
* <strong>@param </strong>args
*/
public static void main(string[] args) {
string slongurl = "http://474515923.qzone.qq.com" ; //长链接
linkserviceimpl link = new linkserviceimpl();
string result = link.gererateshorturl(slongurl);
// 打印出结果
system.out.println("短链接为： "+ result);
}
/**
* 将长链接转换为短链接
* <strong>@param </strong>url
* <strong>@return
</strong><strong> </strong>*/
public string gererateshorturl(string url) {
// 可以自定义生成 md5 加密字符传前的混合 key
string key = "caron" ;
// 要使用生成 url 的字符
string[] chars = new string[] { "a" , "b" , "c" , "d" , "e" , "f" , "g" , "h" ,
"i" , "j" , "k" , "l" , "m" , "n" , "o" , "p" , "q" , "r" , "s" , "t" ,
"u" , "v" , "w" , "x" , "y" , "z" , "0" , "1" , "2" , "3" , "4" , "5" ,
"6" , "7" , "8" , "9" , "a" , "b" , "c" , "d" , "e" , "f" , "g" , "h" ,
"i" , "j" , "k" , "l" , "m" , "n" , "o" , "p" , "q" , "r" , "s" , "t" ,
"u" , "v" , "w" , "x" , "y" , "z"
};
// 对传入网址进行 md5 加密
string smd5encryptresult = md5util.md5(key+url);
string hex = smd5encryptresult;
// string[] resurl = new string[4];
// for ( int i = 0; i < 4; i++) {
// 把加密字符按照 8 位一组 16 进制与 0x3fffffff 进行位与运算
string stempsubstring = hex.substring(2 * 8, 2 * 8 + 8); //固定取第三组
// 这里需要使用 long 型来转换，因为 inteper .parseint() 只能处理 31 位 , 首位为符号位 , 如果不用 long ，则会越界
long lhexlong = 0x3fffffff & long.parselong (stempsubstring, 16);
string outchars = "" ;
for ( int j = 0; j < 6; j++) {
// 把得到的值与 0x0000003d 进行位与运算，取得字符数组 chars 索引
long index = 0x0000003d & lhexlong;
// 把取得的字符相加
outchars += chars[( int ) index];
// 每次循环按位右移 5 位
lhexlong = lhexlong >> 5;
}
// 把字符串存入对应索引的输出数组
// resurl[i] = outchars;
// }
return outchars;
}
}util:
package com.tips.util;
import java.security.messagedigest;
public class md5util {
// md5加码。32位
public static string md5(string instr) {
messagedigest md5 = null;
try {
md5 = messagedigest.getinstance("md5");
} catch (exception e) {
system.out.println(e.tostring());
e.printstacktrace();
return "";
}
char[] chararray = instr.tochararray();
byte[] bytearray = new byte[chararray.length];
for (int i = 0; i < chararray.length; i++)
bytearray[i] = (byte) chararray[i];
byte[] md5bytes = md5.digest(bytearray);
stringbuffer hexvalue = new stringbuffer();
for (int i = 0; i < md5bytes.length; i++) {
int val = ((int) md5bytes[i]) & 0xff;
if (val < 16)
hexvalue.append("0");
hexvalue.append(integer.tohexstring(val));
}
return hexvalue.tostring();
}
// 可逆的加密算法
public static string kl(string instr) {
// string s = new string(instr);
char[] a = instr.tochararray();
for (int i = 0; i < a.length; i++) {
a[i] = (char) (a[i] ^ 't');
}
string s = new string(a);
return s;
}
// 加密后解密
public static string jm(string instr) {
char[] a = instr.tochararray();
for (int i = 0; i < a.length; i++) {
a[i] = (char) (a[i] ^ 't');
}
string k = new string(a);
return k;
}
// 测试主函数
public static void main(string args[]) {
string s = new string("a");
system.out.println("原始：" + s);
system.out.println("md5后：" + md5(s));
system.out.println("md5后再加密：" + kl(md5(s)));
system.out.println("解密为md5后的：" + jm(kl(md5(s))));
system.out.println("判断是否相同：" + md5(s).equals(jm(kl(md5(s)))));
}
} mapper：
<?xml version="1.0" encoding="utf-8"?>
<!doctype mapper public "-//mybatis.org//dtd mapper 3.0//en" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.tips.mapper.linkmapper">
<resultmap id="baseresultmap" type="com.tips.entity.link">
<id column="id" jdbctype="integer" property="id" />
<result column="long_url" jdbctype="varchar" property="longurl" />
<result column="short_url" jdbctype="varchar" property="shorturl" />
</resultmap>
<sql id="base_column_list">
id, long_url, short_url
</sql>
<!-- 根据长链接查询 -->
<select id="findbylongurl" parametertype="java.lang.string" resultmap="baseresultmap">
select
<include refid="base_column_list" />
from link
where long_url = #{longurl,jdbctype=varchar}
</select>
<!-- 根据短链接查询 -->
<select id="findbyshorturl" parametertype="java.lang.string" resulttype="java.lang.string">
select long_url from link
where short_url = #{shorturl,jdbctype=varchar}
</select>
<select id="selectbyprimarykey" parametertype="java.lang.integer" resultmap="baseresultmap">
select
<include refid="base_column_list" />
from link
where id = #{id,jdbctype=integer}
</select>
<insert id="insert" parametertype="com.tips.entity.link">
insert into link (id, long_url, short_url)
values (#{id,jdbctype=integer}, #{longurl,jdbctype=varchar}, #{shorturl,jdbctype=varchar})
</insert>
</mapper>controller:
package com.tips.controller;
import com.tips.entity.link;
import com.tips.service.linkservice;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.stereotype.controller;
import org.springframework.web.bind.annotation.pathvariable;
import org.springframework.web.bind.annotation.requestmapping;
import org.springframework.web.bind.annotation.responsebody;
@controller
public class linkcontroller {
@autowired
private linkservice linkservice;
/**
* 生成短链接
* @param url
* @return caron
*/
@requestmapping("/api")
@responsebody
public object save(string url){
if (url == null || "".equals(url)){
return null;
}
if(url.startswith("http://") || url.startswith("https://")){
link link = new link();
link.setlongurl(url);
return linkservice.save(link);
}else{
return "网址必须以http或https开头";
}
}
/**
* 301跳转
* @param url
* @return
*/
@requestmapping("/{url}")
public string restoreurl(@pathvariable("url") string url){
string restoreurl = linkservice.restoreurl("http://cni.tips/"+url);
if(restoreurl != null && !"".equals(restoreurl)){
return "redirect:"+restoreurl;
}else{
return "redirect:http://www.cnilink.com";
// return "forward:/404.html"; //如果要访问本地html，@requestmapping("/{url}")前面必须加一层路径/aa/{url}
}
}
}application.properties:
pom.xml:
<?xml version="1.0" encoding="utf-8"?> <project xmlns="http://maven.apache.org/pom/4.0.0" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xsi:schemalocation="http://maven.apache.org/pom/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelversion>4.0.0</modelversion> <groupid>com</groupid> <artifactid>tips</artifactid> <version>0.0.1-snapshot</version> <packaging>jar</packaging> <name>tips</name> <description>demo project for spring boot</description> <parent> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-parent</artifactid> <version>2.0.3.release</version> <relativepath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceencoding>utf-8</project.build.sourceencoding> <project.reporting.outputencoding>utf-8</project.reporting.outputencoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupid>org.mybatis.spring.boot</groupid> <artifactid>mybatis-spring-boot-starter</artifactid> <version>1.3.2</version> </dependency> <dependency> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-web</artifactid> </dependency> <dependency> <groupid>mysql</groupid> <artifactid>mysql-connector-java</artifactid> <scope>runtime</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-maven-plugin</artifactid> </plugin> </plugins> </build> </project>
基本所有源码都贴出来了。跑起来试一下呗
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