SSM---后端通过过滤器解决接口调用跨域问题

绝地灬酷狼 2023-07-22 10:28 34阅读 0赞

**场景**

**       前后端分离项目，接口调用时存在跨域问题。后端可通过过滤器解决跨域问题。**

**编写过滤器**

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.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    /**
     * DESC :  解决跨域问题的过滤器
     * @author Lonely
     *
     */
    public class crossDomainFilter implements Filter {
    
    	@Override
    	public void init(FilterConfig filterConfig) throws ServletException {}
    
    	@Override
    	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
    			throws IOException, ServletException {
    		try {
    			HttpServletRequest httpRequest = (HttpServletRequest) request;
    			HttpServletResponse httpResponse = (HttpServletResponse) response;
    
    			// 跨域
    			String origin = httpRequest.getHeader("Origin");
    			if (origin == null) {
    				httpResponse.addHeader("Access-Control-Allow-Origin", "*");
    			} else {
    				httpResponse.addHeader("Access-Control-Allow-Origin", origin);
    			}
    			httpResponse.addHeader("Access-Control-Allow-Headers",
    					"Origin, x-requested-with, Content-Type, Accept,X-Cookie");
    			httpResponse.addHeader("Access-Control-Allow-Credentials", "true");
    			httpResponse.addHeader("Access-Control-Allow-Methods", "GET,POST,PUT,OPTIONS,DELETE");
    			if (httpRequest.getMethod().equals("OPTIONS")) {
    				httpResponse.setStatus(HttpServletResponse.SC_OK);
    				return;
    			}
    			chain.doFilter(request, response);
    		} catch (Exception e) {
    			throw e;
    		}
    	}
    
    	@Override
    	public void destroy() {}
    }

**web.xml配置过滤器**

<filter>
        <filter-name>crossDomainFilter</filter-name>
        
        <filter-class>com.ssm.filter.crossDomainFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>crossDomainFilter</filter-name>
        
        <url-pattern>/*</url-pattern>
    </filter-mapping>

**SpringBoot中也是一样的，通过过滤器解决跨域问题**

[SpringBoot整合过滤器][SpringBoot]

[SpringBoot]: https://blog.csdn.net/qq_39115469/article/details/105325768