实现Java请求头允许跨域教程

流程图

flowchart TD
    A[创建CORS配置类] --> B[添加CORS配置]
    B --> C[配置Filter过滤器]

步骤

步骤 操作 代码
1 创建CORS配置类
2 添加CORS配置 ```java

@Configuration public class CorsConfiguration { @Bean public WebMvcConfigurer corsConfigurer() { return new WebMvcConfigurer() { @Override public void addCorsMappings(CorsRegistry registry) { registry.addMapping("/**").allowedMethods("GET", "POST", "PUT", "DELETE").allowedHeaders("*"); } }; } }

3 | 配置Filter过滤器 | ```java
@Component
public class CorsFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Methods", "GET,POST,PUT,DELETE");
        response.setHeader("Access-Control-Allow-Headers", "*");
        filterChain.doFilter(servletRequest, servletResponse);
    }

    @Override
    public void destroy() {
    }
}

教程

作为一名经验丰富的开发者,实现Java请求头允许跨域是一个常见的问题。在这个教程中,我将教你如何实现这个功能。

首先,我们需要创建一个CORS配置类,代码如下:

@Configuration
public class CorsConfiguration {
    @Bean
    public WebMvcConfigurer corsConfigurer() {
        return new WebMvcConfigurer() {
            @Override
            public void addCorsMappings(CorsRegistry registry) {
                registry.addMapping("/**").allowedMethods("GET", "POST", "PUT", "DELETE").allowedHeaders("*");
            }
        };
    }
}

在这个配置类中,我们使用@Configuration注解标识这是一个配置类,然后创建一个corsConfigurer方法,通过addCorsMappings方法设置允许跨域的请求方法和请求头。

接下来,我们需要创建一个Filter过滤器来处理跨域请求,代码如下:

@Component
public class CorsFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Methods", "GET,POST,PUT,DELETE");
        response.setHeader("Access-Control-Allow-Headers", "*");
        filterChain.doFilter(servletRequest, servletResponse);
    }

    @Override
    public void destroy() {
    }
}

在这个Filter过滤器中,我们设置了响应头部信息,允许所有的来源和请求方法,并且允许所有的请求头信息。

通过以上步骤,我们就成功实现了Java请求头允许跨域的功能。希望这篇教程对刚入行的小白有所帮助,让他们能够顺利解决跨域请求的问题。