java接口程序支持跨域請求設置代碼

 

一種方式：

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;

/**
 * 解決跨域問題
 */
public class KuaYuFilter implements Filter {

    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) res;
        
            response.setHeader("Access-Control-Allow-Origin", "http://127.0.0.1:8080");
            response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
            response.setHeader("Access-Control-Max-Age", "3600");
            response.setHeader("Access-Control-Allow-Headers", "content-type, x-requested-with");
            response.setHeader("Access-Control-Expose-Headers", "Authorization");
            response.setHeader("Access-Control-Allow-Credentials", "true");
            chain.doFilter(req, res);

    }
    public void init(FilterConfig filterConfig) {}
    public void destroy() {}
}

web.xml文件添加信息

<filter>
    <filter-name>accoseFilter</filter-name>
    <filter-class>com.sh.cloudstageapi.base.SimpleCORSFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>accoseFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

另一種方式：

import java.io.IOException;

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

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.filter.OncePerRequestFilter;

public class CorsRequestFilter extends OncePerRequestFilter {
	private final Logger logger = LoggerFactory.getLogger(getClass());

	private String supportedMethods = null;

	private String supportedMaxAge = null;
	
	private final String CHECK_FILE = "ver.txt";

	public void setSupportedMethods(String supportedMethods) {
		this.supportedMethods = supportedMethods;
	}

	public void setSupportedMaxAge(String supportedMaxAge) {
		this.supportedMaxAge = supportedMaxAge;
	}

	@Override
	public void destroy() {
		// TODO Auto-generated method stub

	}

	@Override
	protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
			throws ServletException, IOException {  
	    
	    String url = request.getRequestURI();
	    if(url.endsWith(CHECK_FILE)) {
	        return;
	    }
	    
        String originHeader = request.getHeader("Origin");
        String requestHeaders = request.getHeader("Access-Control-Request-Headers");
		if(this.logger.isDebugEnabled()) {		    
		    this.logger.debug("CorsRequestFilter ipAddress:" + request.getRemoteAddr());
	        this.logger.debug("request_param:" + String.format(
	                "Access-Control-Allow-Origin:%s,Access-Control-Allow-Headers:%s", originHeader, requestHeaders));
		}
		response.addHeader("Access-Control-Allow-Origin", originHeader);
		response.addHeader("Access-Control-Allow-Methods", supportedMethods);
		response.addHeader("Access-Control-Allow-Headers", requestHeaders);
		response.addHeader("Access-Control-Max-Age", supportedMaxAge);
		response.addHeader("Access-Control-Allow-Credentials", "true");
		response.addHeader("X-Content-Type-Options", "nosniff");
        if (!"OPTIONS".equals(request.getMethod())) {
			filterChain.doFilter(request, response);
		}
        
        if(this.logger.isDebugEnabled()) {    
            this.logger.debug("CorsRequestFilter end.");    
        }		
     }
}

web.xml文件添加：

<!-- 跨域支持 -->
    <filter>
      <filter-name>corsFilter</filter-name>
      <filter-class>com.sh.common.filter.CorsRequestFilter</filter-class>
      <init-param>  
          <param-name>supportedMethods</param-name>
          <param-value>GET, POST, HEAD, PUT, DELETE</param-value>
      </init-param>  
      <init-param>  
          <param-name>supportedMaxAge</param-name>
          <param-value>2000</param-value>
      </init-param>       
    </filter>
    <filter-mapping>
      <filter-name>corsFilter</filter-name>
       <url-pattern>/*</url-pattern>
    </filter-mapping>