java跨域问题解决方案

方法一:拦截器interceptor(目前我用的方法)

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


@Component
public class CrossOriginConfig implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) {
        // 预见命令的缓存时间为1个小时
        httpServletResponse.setHeader("Access-Control-Max-Age", "3600");
        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");
        httpServletResponse.setHeader("X-Powered-By", "Jetty");

        String method = httpServletRequest.getMethod();

        if ("OPTIONS".equals(method)) {
            httpServletResponse.setStatus(200);
            return false;
        }
        return true;
    }

}


// 上面没其效果,可能需要webMvcConfigurer里面注入一下
@Configuration
public class WorkflowWebMvcConfig implements WebMvcConfigurer {
    private final CrossOriginConfig crossOriginConfig;

    @Autowired
    public WorkflowWebMvcConfig(CrossOriginConfig crossOriginConfig) {
        this.crossOriginConfig = crossOriginConfig;
    }
    //其他方法省略
}

方法二:过滤器filter

public class SimpleCORSFilter implements Filter{  

    @Override  
    public void destroy() {  

    }  

    @Override  
    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");  
            chain.doFilter(req, res);  

    }  

    @Override  
    public void init(FilterConfig arg0) throws ServletException {  

    }  

} 

还可以单个接口里面修改(也可以把接口请求改成Get方式)

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