利用注解的方式解决AJAX请求跨域问题
1.编写一个支持跨域请求的 Configuration
- 第一种方式
- CorsConfig.java
import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.config.annotation.CorsRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter; /** * 处理AJAX请求跨域的问题 * @author Levin * @time 2017-07-13 */ @Configuration public class CorsConfig extends WebMvcConfigurerAdapter { static final String ORIGINS[] = new String[] { "GET", "POST", "PUT", "DELETE" }; @Override public void addCorsMappings(CorsRegistry registry) { registry.addMapping("/**").allowedOrigins("*").allowCredentials(true).allowedMethods(ORIGINS) .maxAge(3600); } }
2.HTTP请求接口
- HelloController.java
@RestController public class HelloController { @Autowired HelloService helloService; @GetMapping(value = "/test", produces = MediaType.APPLICATION_JSON_UTF8_VALUE) public String query() { return "hello"; } }
- 第二种方式（推荐）
PS：第一种存在一个问题，当服务器抛出 500 的时候依旧存在跨域问题
@SpringBootApplication @ComponentScan @EnableDiscoveryClient public class ManagementApplication { public static void main(String[] args) { SpringApplication.run(ManagementApplication.class, args); } private CorsConfiguration buildConfig() { CorsConfiguration corsConfiguration = new CorsConfiguration(); corsConfiguration.addAllowedOrigin("*"); corsConfiguration.addAllowedHeader("*"); corsConfiguration.addAllowedMethod("*"); corsConfiguration.addExposedHeader(HttpHeaderConStant.X_TOTAL_COUNT); return corsConfiguration; } /** * 跨域过滤器 * * @return */ @Bean public CorsFilter corsFilter() { UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource(); source.registerCorsConfiguration("/**", buildConfig()); // 4 return new CorsFilter(source); } }
- index.html
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>跨域请求</title> <script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js"> </script> <script> $(document).ready(function(){ $("button").click(function(){ $.ajax({url:"http://localhost:8080/test",success:function(result){ $("#p1").html(result); }}); }); }); </script> </head> <body> <p width="500px" height="100px" id="p1"></p> <button>获取其他内容</button> </body> </html>