Spring|Spring Boot 如何解决富文本上传图片跨域问题 SpringBoot如何解决富文本上传图

Spring Boot 解决富文本上传图片跨域

创建一个WebMvcConfig类
创建一个Filter类，做页面跨域的处理

springboot文件上传跨域

前端
后端

Spring Boot 解决富文本上传图片跨域在前后端分离的情况下，后台所写的接口在前端调用的时候，可能前端浏览器已经读取到了数据，但是在前端代码ajax请求的时候，请求回调里会出现页面跨域的控制台打印错误，这个时候只需要后台配置一下头部请求就可以解决
我用的是SpringBoot，讲解一下如何配置SpringBoot来解决页面跨域问题

创建一个WebMvcConfig类
将关于web的配置信息都用注解的形式来配置，相对比较方便

import com.alibaba.fastjson.serializer.SerializerFeature; import com.alibaba.fastjson.support.config.FastJsonConfig; import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter; import com.uhope.web.codegenerator.filter.ServiceFilter; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.boot.autoconfigure.http.HttpMessageConverters; import org.springframework.boot.web.servlet.FilterRegistrationBean; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.http.converter.HttpMessageConverter; import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter; import java.nio.charset.Charset; /** * Spring MVC 配置 * @author Chenbin */@Configurationpublic class WebMvcConfig extends WebMvcConfigurerAdapter {private final Logger logger = LoggerFactory.getLogger(WebMvcConfig.class); /*** 解决路径资源映射问题** @param registry*/@Overridepublic void addResourceHandlers(ResourceHandlerRegistry registry) {registry.addResourceHandler("swagger-ui.html").addResourceLocations("classpath:/META-INF/resources/"); registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/"); registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/"); }/*** 使用fastJson代替Jackjson解析JSON数据** @return*/@Beanpublic HttpMessageConverters fastJsonHttpMessageConverters() {FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter(); FastJsonConfig fastJsonConfig = new FastJsonConfig(); /** 转换为JSON字符串，默认:* WriteNullListAsEmptyList字段如果为null,输出为[],而非null* WriteNullStringAsEmpty字符类型字段如果为null,输出为”“,而非null* WriteMapNullValue是否输出值为null的字段,默认为false*/fastJsonConfig.setSerializerFeatures(SerializerFeature.WriteNullListAsEmpty, SerializerFeature.WriteNullStringAsEmpty, SerializerFeature.WriteMapNullValue, SerializerFeature.WriteDateUseDateFormat); fastConverter.setFastJsonConfig(fastJsonConfig); fastConverter.setDefaultCharset(Charset.forName("UTF-8")); HttpMessageConverter converter = fastConverter; return new HttpMessageConverters(converter); }/*** 这个Filter 解决页面跨域访问问题*/@Beanpublic FilterRegistrationBean omsFilter() {FilterRegistrationBean registration = new FilterRegistrationBean(); registration.setFilter(new ServiceFilter()); registration.addUrlPatterns("/*"); registration.setName("MainFilter"); registration.setAsyncSupported(true); registration.setOrder(1); return registration; }}

其中JSON数据返回需要引入阿里巴巴FastJson这个依赖，可以自行去pom.xml文件中引入
这样还不够，还需要

创建一个Filter类，做页面跨域的处理

import org.slf4j.Logger; import org.slf4j.LoggerFactory; import javax.servlet.*; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; /** * @author Chenbin */public class ServiceFilter implements Filter {private static final Logger LOGGER = LoggerFactory.getLogger(ServiceFilter.class); @Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain)throws IOException, ServletException {HttpServletResponse resp = (HttpServletResponse) response; HttpServletRequest req = (HttpServletRequest) request; // 解决页面跨域访问问题resp.setHeader("Access-Control-Allow-Origin", "*"); resp.setHeader("Access-Control-Allow-Credentials", "true"); resp.setHeader("Access-Control-Allow-Methods", "*"); resp.setHeader("Access-Control-Allow-Headers", "Content-Type,Access-Token"); resp.setHeader("Access-Control-Expose-Headers", "*"); filterChain.doFilter(req, resp); }@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void destroy() {}}

这两个类配置好了以后，重启服务，再与前端交互就不会出现这样的跨域问题了，因为在Filter这个类里加了一个请求头Access-Control-Allow-Origin

springboot文件上传跨域
前端

//跨域认证axios.defaults.withCredentials = falseaxios.defaults.crossDomain = true

后端
2个类复制进去
启动类添加包扫描

import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.config.annotation.CorsRegistry; import org.springframework.web.servlet.config.annotation.InterceptorRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter; /** * Cros协议的配置类。 * 继承WebMvcConfigurerAdapter，并且重写方法addCorsMappings。 * addCorsMappings方法是用于增加Cros协议配置的方法。默认的实现是空实现。也就是说，在默认的配置环境中，是不进行Cros协议的配置的。 */@Configurationpublic class CrosConfiguration extends WebMvcConfigurerAdapter {@AutowiredProcessInterceptor processInterceptor; @Overridepublic void addInterceptors(InterceptorRegistry registry) {// 添加拦截器(拦截器中只有preHandle返回true时才继续执行下一个拦截器或者controller，否则直接返回)// registry.addInterceptor(logInterceptor).addPathPatterns("/**"); registry.addInterceptor(processInterceptor).addPathPatterns("/**"); //registry.addInterceptor(csrCheckInterceptor).addPathPatterns("/**"); //registry.addInterceptor(menuAuthInterceptor).addPathPatterns("/**"); super.addInterceptors(registry); }/*** 就是注册的过程，注册Cors协议的内容。* 如： Cors协议支持哪些请求URL，支持哪些请求类型，请求时处理的超时时长是什么等。* @param registry - 就是用于注册Cros协议内容的一个注册器。*/@Overridepublic void addCorsMappings(CorsRegistry registry) {registry.addMapping("/**")// 所有的当前站点的请求地址，都支持跨域访问。.allowedMethods("GET", "POST", "PUT", "DELETE","OPTIONS") // 当前站点支持的跨域请求类型是什么。.allowCredentials(true) // 是否支持跨域用户凭证.allowedHeaders("*").allowedOrigins("*") // 所有的外部域都可跨域访问。如果是localhost则很难配置，因为在跨域请求的时候，外部域的解析可能是localhost、127.0.0.1、主机名.maxAge(3600); // 超时时长设置为1小时。时间单位是秒。}}

import org.springframework.stereotype.Component; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * @author:Administrator * @date:2019/10/9 */@Componentpublic class ProcessInterceptor implements HandlerInterceptor { @Overridepublic boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception { httpServletResponse.setHeader("Access-Control-Allow-Headers", "X-Requested-With, Accept, Content-Type,Authorization"); httpServletResponse.setHeader("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS"); String origin = httpServletRequest.getHeader("Origin"); httpServletResponse.setHeader("Access-Control-Allow-Origin", "*"); // 是否允许浏览器携带用户身份信息（cookie）,设置为true,必须设置域名,不能使用通配符//httpServletResponse.setHeader("Access-Control-Allow-Credentials", "true"); //httpServletResponse.setHeader("Access-Control-Allow-Origin", "*"); //httpServletResponse.setHeader("Access-Control-Allow-Headers", "Content-Type,Content-Length, Authorization, Accept,X-Requested-With"); //httpServletResponse.setHeader("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS"); String method = httpServletRequest.getMethod(); if (method.equals("OPTIONS")) {httpServletResponse.setStatus(200); return false; }return true; } @Overridepublic void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception { } @Overridepublic void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception { }}

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