前后端工具


工具

前端

axios和vue

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<script src="https://cdn.staticfile.org/vue/2.4.2/vue.min.js"></script>
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>

后端

Maven配置

阿里云镜像

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<mirrors>
<mirror>
<id>aliyunmaven</id>
<mirrorOf>central</mirrorOf>
<name>aliyun maven</name>
<url>https://maven.aliyun.com/repository/public </url>
</mirror>
</mirrors>

jdk编译

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<profiles>
<profile>
<id>jdk-1.8</id>
<activation>
<activeByDefault>true</activeByDefault>
<jdk>1.8</jdk>
</activation>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion>
</properties>
</profile>
</profiles>

清理Maven仓库脚本

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@echo off
rem create by NettQun
rem 这里写你的仓库路径
set REPOSITORY_PATH=E:\Develop\maven_rep
rem 正在搜索...
for /f "delims=" %%i in ('dir /b /s "%REPOSITORY_PATH%\*lastUpdated*"') do (
echo %%i
del /s /q "%%i"
)
rem 搜索完毕
paus

创建一个bat文件,然后复制上述脚本进去,修改其中maven本地仓库的地址,保存后双击执行即可。

Lombok

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import com.fasterxml.jackson.annotation.JsonInclude;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;


@Data
@AllArgsConstructor
@NoArgsConstructor
@JsonInclude(JsonInclude.Include.NON_NULL) //如果有个为空,那么不显示在json中

拦截器

① 建一个类实现HandlerInterceptor接口

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@Component
public class MyInterceptor implements HandlerInterceptor {

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

//获取请求头中的token
String token = request.getHeader("token");
//判断token是否为空,如果为空也代表未登录 提醒重新登录(401)
if (!StringUtils.hasText(token)) {
response.sendError(HttpServletResponse.SC_UNAUTHORIZED);
return false;
}
//解析token看看是否成功
try {
Claims claims = JwtUtil.parseJWT(token);
String subject = claims.getSubject();
System.out.println(subject);
} catch (Exception e) {
e.printStackTrace();
//如果解析过程中没有出现异常说明是登录状态
//如果出现了异常,说明未登录,提醒重新登录(401)
response.sendError(HttpServletResponse.SC_UNAUTHORIZED);
return false;
}
return true;

}

}

② 第二实现WebMvcConfigurer接口

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@Configuration
public class InterceptorConfig implements WebMvcConfigurer {

@Autowired
private MyInterceptor myInterceptor;

/**
* @param registry
*/
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(myInterceptor).addPathPatterns("/**").excludePathPatterns("/sys_user/login");
}
}

JWT工具类

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      <!--jwt-->
<dependency>
<groupId>io.jsonwebtoken</groupId>
<artifactId>jjwt</artifactId>
<version>0.9.0</version>
</dependency>
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/**
* JWT工具类
*/
public class JwtUtil {
//有效期为
public static final Long JWT_TTL = 60 * 60 *1000L;// 60 * 60 *1000 一个小时
//设置秘钥明文
public static final String JWT_KEY = "sangeng";
/**
* 创建token
* @param id
* @param subject
* @param ttlMillis
* @return
*/
public static String createJWT(String id, String subject, Long ttlMillis) {
SignatureAlgorithm signatureAlgorithm = SignatureAlgorithm.HS256;
long nowMillis = System.currentTimeMillis();
/*
4.6.0.3 登录接口实现
数据准备
*/
Date now = new Date(nowMillis);
if(ttlMillis==null){
ttlMillis=JwtUtil.JWT_TTL;
}
long expMillis = nowMillis + ttlMillis;
Date expDate = new Date(expMillis);
SecretKey secretKey = generalKey();
JwtBuilder builder = Jwts.builder()
.setId(id) //唯一的ID
.setSubject(subject) // 主题 可以是JSON数据
.setIssuer("sg") // 签发者
.setIssuedAt(now) // 签发时间
.signWith(signatureAlgorithm, secretKey) //使用HS256对称加密算法签名, 第二个参数为秘钥

.setExpiration(expDate);// 设置过期时间
return builder.compact();
}
/**
* 生成加密后的秘钥 secretKey
* @return
*/
public static SecretKey generalKey() {
byte[] encodedKey = Base64.getDecoder().decode(JwtUtil.JWT_KEY);
SecretKey key = new SecretKeySpec(encodedKey, 0, encodedKey.length,
"AES");
return key;
}
/**
* 解析
*
* @param jwt
* @return
* @throws Exception
*/
public static Claims parseJWT(String jwt) throws Exception {
SecretKey secretKey = generalKey();
return Jwts.parser()
.setSigningKey(secretKey)
.parseClaimsJws(jwt)
.getBody();
}
}

Cors跨域请求解决

① 实现WebMvcConfigurer

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@Configuration
public class CorsConfig implements WebMvcConfigurer {
@Override
public void addCorsMappings(CorsRegistry registry) {
// 设置允许跨域的路径
registry.addMapping("/**")
// 设置允许跨域请求的域名
.allowedOriginPatterns("*")
// 是否允许cookie
.allowCredentials(true)
// 设置允许的请求方式
.allowedMethods("GET", "POST", "DELETE", "PUT")
// 设置允许的header属性
.allowedHeaders("*")
// 跨域允许时间
.maxAge(3600);
}
}

② Controller中加入注解@CrossOrigin

统一返回响应码

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package com.sangeng.common;

import com.fasterxml.jackson.annotation.JsonInclude;

@JsonInclude(JsonInclude.Include.NON_NULL)
public class ResponseResult<T> {
/**
* 状态码
*/
private Integer code;
/**
* 提示信息,如果有错误时,前端可以获取该字段进行提示
*/
private String msg;
/**
* 查询到的结果数据,
*/
private T data;

public ResponseResult(Integer code, String msg) {
this.code = code;
this.msg = msg;
}

public ResponseResult(Integer code, T data) {
this.code = code;
this.data = data;
}

public Integer getCode() {
return code;
}

public void setCode(Integer code) {
this.code = code;
}

public String getMsg() {
return msg;
}

public void setMsg(String msg) {
this.msg = msg;
}

public T getData() {
return data;
}

public void setData(T data) {
this.data = data;
}

public ResponseResult(Integer code, String msg, T data) {
this.code = code;
this.msg = msg;
this.data = data;
}
}

热部署

自动编译,不需重启项目

① 引入依赖

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<!--devtools热部署-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
</dependency>

image-20231119213048392

image-20231119213103443

判断字符串是否为NULL

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StringUtils.hasText(str)

统一异常处理

① 注解 @ControllerAdvice

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@ControllerAdvice
@ResponseBody
public class SGControllerAdvice {

@ExceptionHandler(Exception.class)
public ResponseResult handleException(Exception e){
return new ResponseResult(500,e.getMessage());
}
}

② 实现 HandlerExceptionResolver接口

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public class Ex implements HandlerExceptionResolver {

@Override
public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
return null;
}
}

AOP

① 引入依赖

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<!--       aop-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>

② 开启aop

image-20231120162259761

③ 注解切入点

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package com.sangeng.aop;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface InvokeLog {
}

④ 配置切面类

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package com.sangeng.aop;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.util.Arrays;

@Aspect //标识这是一个切面类
@Component
public class InvokeLogAspect {

//确定切点
@Pointcut("@annotation(com.sangeng.aop.InvokeLog)")
public void pt() {
}

@Around("pt()")
public Object printInvokeLog(ProceedingJoinPoint joinPoint) {
//目标方法调用前
Object proceed = null;
MethodSignature signature = (MethodSignature) joinPoint.getSignature();

String methodName = signature.getMethod().getName();
//类名
String className = signature.getDeclaringTypeName();
//方法名
String methodName1 = signature.getName();
//调用时传入的参数
Object[] args = joinPoint.getArgs();
//被代理对象
Object target = joinPoint.getTarget();

System.out.println(className+"=="+methodName1+"======"+ Arrays.toString(args));

System.out.println(methodName + "即将被调用");
try {
proceed = joinPoint.proceed();
//目标方法调用后
System.out.println(methodName + "被调用完了");
} catch (Throwable throwable) {
throwable.printStackTrace();
//目标方法出现异常了
System.out.println(methodName + "出现了异常");
}
return proceed;
}
}

Thymeleaf模板引擎

image-20231120162549868

环境切换image-20231120165348281

image-20231120165357283

激活环境

我们可以再application.yml文件中使用spring.profiles.active属性来配置激活哪个环境。

也可以使用虚拟机参数来指定激活环境。例如

-Dspring.profiles.active=test

也可以使用命令行参数来激活环境。例如: –spring.profiles.active =test

image-20231120165329511

指标监控

我们在日常开发中需要对程序内部的运行情况进行监控, 比如:健康度、运行指标、日志信息、线程状 况等等 。而SpringBoot的监控Actuator就可以帮我们解决这些问题。

① 添加依赖

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<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

② 配置启用监控端点

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management:
endpoints:
enabled-by-default: true #配置启用所有端点
web:
exposure:
include: "*" #web端暴露所有端点
endpoint:
health:
show-details: always

③ 常用端点

image-20231120190728011

图形化指标监控(SpringBoot Admin)

①创建SpringBoot Admin Server应用 要求引入spring-boot-admin-starter-server依赖

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<dependency>
<groupId>de.codecentric</groupId>
<artifactId>spring-boot-admin-starter-server</artifactId>
</dependency>

②配置SpringBoot Admin client应用

在需要监控的应用中加上spring-boot-admin-starter-client依赖

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<dependency>
<groupId>de.codecentric</groupId>
<artifactId>spring-boot-admin-starter-client</artifactId>
<version>2.3.1</version>
</dependency>

然后配置SpringBoot Admin Server的地址

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spring:
boot:
admin:
client:
url: http://localhost:8888 #配置 Admin Server的地址

Redis工具类

配置类(序列化和反序列化)

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package com.sangeng.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.StringRedisSerializer;

@Configuration
public class RedisConfig {
@Bean
@SuppressWarnings(value = {"unchecked", "rawtypes"})
public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory
connectionFactory) {
RedisTemplate<Object, Object> template = new RedisTemplate<>();
template.setConnectionFactory(connectionFactory);
FastJsonRedisSerializer serializer = new
FastJsonRedisSerializer(Object.class);
// 使用StringRedisSerializer来序列化和反序列化redis的key值
template.setKeySerializer(new StringRedisSerializer());
template.setValueSerializer(serializer);
// Hash的key也采用StringRedisSerializer的序列化方式
template.setHashKeySerializer(new StringRedisSerializer());
template.setHashValueSerializer(serializer);
template.afterPropertiesSet();
return template;
}
}

Redis的Utils包

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package com.sangeng.utils;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.BoundSetOperations;
import org.springframework.data.redis.core.HashOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Component;

import java.util.*;
import java.util.concurrent.TimeUnit;

@SuppressWarnings(value = {"unchecked", "rawtypes"})
@Component
public class RedisCache {
@Autowired
public RedisTemplate redisTemplate;

/**
* 缓存基本的对象,Integer、String、实体类等
*
* @param key 缓存的键值
* @param value 缓存的值
*/
public <T> void setCacheObject(final String key, final T value) {
redisTemplate.opsForValue().set(key, value);
}

/**
* 缓存基本的对象,Integer、String、实体类等
*
* @param key 缓存的键值
* @param value 缓存的值
* @param timeout 时间
* @param timeUnit 时间颗粒度
*/
public <T> void setCacheObject(final String key, final T value, final
Integer timeout, final TimeUnit timeUnit) {
redisTemplate.opsForValue().set(key, value, timeout, timeUnit);
}

/**
* 设置有效时间
*
* @param key Redis键
* @param timeout 超时时间
* @return true=设置成功;false=设置失败
*/
public boolean expire(final String key, final long timeout) {
return expire(key, timeout, TimeUnit.SECONDS);
}

/**
* 设置有效时间
*
* @param key Redis键
* @param timeout 超时时间
* @param unit 时间单位
* @return true=设置成功;false=设置失败
*/
public boolean expire(final String key, final long timeout, final TimeUnit
unit) {
return redisTemplate.expire(key, timeout, unit);
}

/**
* 获得缓存的基本对象。
*
* @param key 缓存键值
* @return 缓存键值对应的数据
*/
public <T> T getCacheObject(final String key) {
ValueOperations<String, T> operation = redisTemplate.opsForValue();
return operation.get(key);
}

/**
* 删除单个对象
*
* @param key
*/
public boolean deleteObject(final String key) {
return redisTemplate.delete(key);
}

/**
* 删除集合对象
*
* @param collection 多个对象
* @return
*/
public long deleteObject(final Collection collection) {
return redisTemplate.delete(collection);
}

/**
* 缓存List数据
*
* @param key 缓存的键值
* @param dataList 待缓存的List数据
* @return 缓存的对象
*/
public <T> long setCacheList(final String key, final List<T> dataList) {
Long count = redisTemplate.opsForList().rightPushAll(key, dataList);
return count == null ? 0 : count;
}

/**
* 获得缓存的list对象
*
* @param key 缓存的键值
* @return 缓存键值对应的数据
*/
public <T> List<T> getCacheList(final String key) {
return redisTemplate.opsForList().range(key, 0, -1);
}

/**
* 缓存Set
*
* @param key 缓存键值
* @param dataSet 缓存的数据
* @return 缓存数据的对象
*/
public <T> BoundSetOperations<String, T> setCacheSet(final String key, final
Set<T> dataSet) {
BoundSetOperations<String, T> setOperation =
redisTemplate.boundSetOps(key);
Iterator<T> it = dataSet.iterator();
while (it.hasNext()) {
setOperation.add(it.next());
}
return setOperation;
}

/**
* 获得缓存的set
*
* @param key
* @return
*/
public <T> Set<T> getCacheSet(final String key) {
return redisTemplate.opsForSet().members(key);
}

/**
* 缓存Map
*
* @param key
* @param dataMap
*/
public <T> void setCacheMap(final String key, final Map<String, T> dataMap) {
if (dataMap != null) {
redisTemplate.opsForHash().putAll(key, dataMap);
}
}

/**
* 获得缓存的Map
*
* @param key
* @return
*/
public <T> Map<String, T> getCacheMap(final String key) {
return redisTemplate.opsForHash().entries(key);
}

/**
* 往Hash中存入数据
*
* @param key Redis键
* @param hKey Hash键
* @param value 值
*/
public <T> void setCacheMapValue(final String key, final String hKey, final
T value) {
redisTemplate.opsForHash().put(key, hKey, value);
}

/**
* 获取Hash中的数据
*
* @param key Redis键
* @param hKey Hash键
* @return Hash中的对象
*/
public <T> T getCacheMapValue(final String key, final String hKey) {
HashOperations<String, String, T> opsForHash =
redisTemplate.opsForHash();
return opsForHash.get(key, hKey);
}

/**
* 删除Hash中的数据
*
* @param key
* @param hkey
*/
public void delCacheMapValue(final String key, final String hkey) {
HashOperations hashOperations = redisTemplate.opsForHash();
hashOperations.delete(key, hkey);
}

/**
* 获取多个Hash中的数据
*
* @param key Redis键
* @param hKeys Hash键集合
* @return Hash对象集合
*/
public <T> List<T> getMultiCacheMapValue(final String key, final
Collection<Object> hKeys) {
return redisTemplate.opsForHash().multiGet(key, hKeys);
}

/**
* 获得缓存的基本对象列表
*
* @param pattern 字符串前缀
* @return 对象列表
*/
public Collection<String> keys(final String pattern) {
return redisTemplate.keys(pattern);
}
}

JWT工具类

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package com.sangeng.utils;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.JwtBuilder;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;

import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;
import java.util.Date;
import java.util.UUID;

/**
* JWT工具类
*/
public class JwtUtil {
//有效期为
public static final Long JWT_TTL = 60 * 60 * 1000L;// 60 * 60 *1000 一个小时
//设置秘钥明文
public static final String JWT_KEY = "sangeng";

public static String getUUID() {
String token = UUID.randomUUID().toString().replaceAll("-", "");
return token;
}

/**
* 生成jtw
*
* @param subject token中要存放的数据(json格式)
* @return
*/
public static String createJWT(String subject) {
JwtBuilder builder = getJwtBuilder(subject, null, getUUID());// 设置过期时间
return builder.compact();
}

/**
* 生成jtw
*
* @param subject token中要存放的数据(json格式)
* @param ttlMillis token超时时间
* @return
*/
public static String createJWT(String subject, Long ttlMillis) {
JwtBuilder builder = getJwtBuilder(subject, ttlMillis, getUUID());// 设置过期时间
return builder.compact();
}

private static JwtBuilder getJwtBuilder(String subject, Long ttlMillis,
String uuid) {
SignatureAlgorithm signatureAlgorithm = SignatureAlgorithm.HS256;
SecretKey secretKey = generalKey();
long nowMillis = System.currentTimeMillis();
Date now = new Date(nowMillis);
if (ttlMillis == null) {
ttlMillis = JwtUtil.JWT_TTL;
}
long expMillis = nowMillis + ttlMillis;
Date expDate = new Date(expMillis);
return Jwts.builder()
.setId(uuid) //唯一的ID
.setSubject(subject) // 主题 可以是JSON数据
.setIssuer("sg") // 签发者
.setIssuedAt(now) // 签发时间
.signWith(signatureAlgorithm, secretKey) //使用HS256对称加密算法签 名, 第二个参数为秘钥
.setExpiration(expDate);
}

/**
* 创建token
*
* @param id
* @param subject
* @param ttlMillis
* @return
*/
public static String createJWT(String id, String subject, Long ttlMillis) {
JwtBuilder builder = getJwtBuilder(subject, ttlMillis, id);// 设置过期时间
return builder.compact();
}

public static void main(String[] args) throws Exception {
String token =
"eyJhbGciOiJIUzI1NiJ9.eyJqdGkiOiJjYWM2ZDVhZi1mNjVlLTQ0MDAtYjcxMi0zYWEwOGIyOTIwYjQiLCJzdWIiOiJzZyIsImlzcyI6InNnIiwiaWF0IjoxNjM4MTA2NzEyLCJleHAiOjE2MzgxMTAzMTJ9.JVsSbkP94wuczb4QryQbAke3ysBDIL5ou8fWsbt_ebg ";
Claims claims = parseJWT(token);
System.out.println(claims);
}

/**
* 生成加密后的秘钥 secretKey
*
* @return
*/
public static SecretKey generalKey() {
byte[] encodedKey = Base64.getDecoder().decode(JwtUtil.JWT_KEY);
SecretKey key = new SecretKeySpec(encodedKey, 0, encodedKey.length,
"AES");
return key;
}

/**
* 解析
*
* @param jwt
* @return
* @throws Exception
*/
public static Claims parseJWT(String jwt) throws Exception {
SecretKey secretKey = generalKey();
return Jwts.parser()
.setSigningKey(secretKey)
.parseClaimsJws(jwt)
.getBody();
}
}

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