98 lines
2.5 KiB
Markdown
98 lines
2.5 KiB
Markdown
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# 后端初始化
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## 跨域问题
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前端与后端的端口号不一致----》跨域问题
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### 解决方案
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- 后端来支持跨域
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- 代理 nginx 第三方脚手架
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```java
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package com.zds.zds_picture_backend.conifg;/*
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*@auther 郑笃实
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*@version 1.0
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*
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*/
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import org.springframework.context.annotation.Configuration;
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import org.springframework.web.servlet.config.annotation.CorsRegistry;
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import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
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/**
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* 全局跨域配置
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*/
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@Configuration
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public class CorsConfig implements WebMvcConfigurer {
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@Override
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public void addCorsMappings(CorsRegistry registry) {
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// 覆盖所有请求
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registry.addMapping("/**")
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// 允许发送 Cookie
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.allowCredentials(true)
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// 放行哪些域名（必须用 patterns，否则 * 会和 allowCredentials 冲突）
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.allowedOriginPatterns("*")
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// 放行哪些请求方式
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.allowedMethods("GET", "POST", "PUT", "DELETE", "OPTIONS")
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// 放行哪些请求头
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.allowedHeaders("*")
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// 暴露哪些响应头
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.exposedHeaders("*");
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}
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}
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```
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使用这个就可以让解决跨域问题
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## lombok报错
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[【已解决】java: java.lang.NoSuchFieldError: Class com.sun.tools.javac.tree.JCTree$JCImport does not have-CSDN博客](https://blog.csdn.net/weixin_36829761/article/details/136287081)
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```xml
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<!-- Lombok：只保留一条，provided；由 compiler plugin 负责 annotation processing -->
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<version>${lombok.version}</version>
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<scope>provided</scope>
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</dependency>
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```
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## @MapperScan("com.zds.zds_picture_backend.mapper")
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这是mybatis-plus的注解，用于扫描mapper接口
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mapper层是针对数据库的
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## 在进行跨域以后前后端依旧不连通
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那有可能是 前端发送的是HTTPS的 而后端springboot内置的tomcat是只能支持http协议的 协议不同所有可能导致前端调用后端的时候出现问题
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## LoginUserVO
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```java
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public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request)
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```
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为什么需要这个 ```HttpServletRequest request``` 因为我们登录账号的时候需要给他种session 所以我们需要request
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## id精度问题
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从后端调出来的id精度可能跟后端的精度不一致，甚至可能会导致json中的和展示的不一样
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