java 服務端設置跨域

java與前端對接，跨域問題

// 最簡單的處理方式
response.setHeader("Access-Control-Allow-Origin","*");

2.

// 這個可以用過濾器統一處理
if (request.getHeader("Access-Control-Request-Method") != null && "OPTIONS".equals(request.getMethod())) {
            // CORS "pre-flight" request
            response.addHeader("Access-Control-Allow-Origin", "*");
            response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");
            response.setHeader("Access-Control-Allow-Headers", "x-requested-with");
            response.addHeader("Access-Control-Max-Age", "1800");//30 min
        }

3.使用攔截器統一做跨域處理

@Component
public class CORSInterceptor extends HandlerInterceptorAdapter {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //添加跨域CORS
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Headers", "X-Requested-With,content-type,token");
        response.setHeader("Access-Control-Allow-Methods", "GET, HEAD, POST, PUT, DELETE, TRACE, OPTIONS, PATCH");
        return true;
    }
}

4.最后啟用攔截器就ok，以下展示在Spring-boot配置

public class WebConfigTest extends WebMvcConfigurerAdapter {
    @Autowired
    private CORSInterceptor corsInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(corsInterceptor);
    }
}