Java实现跨域的5种方式
1. 返回新的 CorsFilter(全局跨域)
package org.chuancey.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;
@Configuration
public class GlobalCorsConfig {
@Bean
public CorsFilter corsFilter() {
//1. 添加 CORS配置信息
CorsConfiguration config = new CorsConfiguration();
// 放行哪些原始域
config.addAllowedOrigin("*");
// 是否发送 Cookie
config.setAllowCredentials(true);
// 放行哪些请求方式
config.addAllowedMethod("*");
// 放行哪些原始请求头部信息
config.addAllowedHeader("*");
// 暴露哪些头部信息
config.addExposedHeader("*");
//2. 添加映射路径
UrlBasedCorsConfigurationSource corsConfigurationSource = new UrlBasedCorsConfigurationSource();
corsConfigurationSource.registerCorsConfiguration("/**",config);
//3. 返回新的CorsFilter
return new CorsFilter(corsConfigurationSource);
}
}
2. 重写 WebMvcConfigurer(全局跨域)
package org.chuancey.config;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration
public class CorsConfig implements WebMvcConfigurer {
@Override
public void addCorsMappings(CorsRegistry registry) {
registry.addMapping("/**")
//放行哪些原始域
.allowedOrigins("*")
.allowedHeaders("*")
// 是否发送Cookie
.allowCredentials(true)
.allowedMethods("GET", "POST", "OPTIONS", "DELETE", "PUT", "PATCH")
.maxAge(3600);
}
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/**")
.addResourceLocations("classpath:/static/");
registry.addResourceHandler("swagger-ui.html")
.addResourceLocations("classpath:/META-INF/resources/");
registry.addResourceHandler("doc.html")
.addResourceLocations("classpath:/META-INF/resources/");
registry.addResourceHandler("/webjars/**")
.addResourceLocations("classpath:/META-INF/resources/webjars/");
}
}
3. 使用注解 (局部跨域)
在控制器(类上)上使用注解 @CrossOrigin，表示该类的所有方法允许跨域。
@RestController
@CrossOrigin(origins = "*")
public class VerificationController {
}
在方法上使用注解 @CrossOrigin
@PostMapping("/check/phone")
@CrossOrigin(origins = "*")
public boolean checkPhoneNumber(@RequestBody @ApiParam VerificationPojo verification) throws BusinessException {
return false;
}
4. 手动设置响应头(局部跨域)
使用 HttpServletResponse 对象添加响应头(Access-Control-Allow-Origin)来授权原始域，这里 Origin的值也可以设置为 “*”,表示全部放行。
@RequestMapping("/home")
public String home(HttpServletResponse response) {
response.addHeader("Access-Allow-Control-Origin","*");
return "home";
}
5. 使用自定义filter实现跨域
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Component;
@Slf4j
@Configuration
@WebFilter(filterName = "accessFilter", urlPatterns = "/*")
public class MyCorsFilter implements Filter {
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
HttpServletResponse response = (HttpServletResponse) res;
response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
response.setHeader("Access-Control-Max-Age", "3600");
response.setHeader("Access-Control-Allow-Headers", "x-requested-with,content-type");
chain.doFilter(req, res);
}
public void init(FilterConfig filterConfig) {log.info("AccessFilter过滤器初始化！");}
public void destroy() {}
}
xml使自定义Filter生效方式
<!-- 跨域访问 START-->
<filter>
<filter-name>CorsFilter</filter-name>
<filter-class>org.chuancey.filter.MyCorsFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>CorsFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- 跨域访问 END-->
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