使用servlet过滤器实现跨域功能
1.定义过滤器接口Filter的实现类,实现类中修改respone的头信息,把 “Access-Control-Allow-Origin” 的域名修改问请求方的域名,如下:
package filter;
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.HttpServletResponse;
public class CORSFilter implements Filter {
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, PUT, OPTIONS, DELETE");
response.setHeader("Access-Control-Max-Age", "3600");
response.setHeader("Access-Control-Allow-Headers", "x-requested-with, Content-Type");
response.setHeader("Access-Control-Allow-Credentials", "true");
chain.doFilter(req, res);
}
public void init(FilterConfig filterConfig) {}
public void destroy() {} }
<filter>
<filter-name>CORSFilter</filter-name>
<filter-class>com.exiao.platform.api.supplier.filter.CORSFilter</filter-class>
</filter>
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springboot 服务器端设置允许跨域
package cn.xydata.util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import javax.servlet.*;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
* 跨域过滤器
* @author cjq
* @since 2017年9月26日
*/
@Component
public class CorsFilterUtil implements Filter {
private static final Logger logger = LoggerFactory.getLogger(CorsFilterUtil.class);
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,PUT,OPTIONS,PATCH");
response.setHeader("Access-Control-Max-Age", "3600");
response.setHeader("Access-Control-Allow-Headers", "x-requested-with");
System.out.println("*********************************过滤器被使用**************************");
chain.doFilter(req, res);
}
public void init(FilterConfig filterConfig) {}
public void destroy() {}
}