java服務端允許跨域請求

1. 編寫自定義過濾器，對於跨域的請求進行過濾，然後設置header使其支持跨域請求

package com.demo.cxf.restful.filter;

import java.io.IOException;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

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;

public class CORSFilter implements Filter{

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

    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
            throws IOException, ServletException {
      //設置跨域請求
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) res;
        String[] allowDomains = {"http://runapi.showdoc.cc"};
        Set allowOrigins = new HashSet(Arrays.asList(allowDomains));
        String originHeads = request.getHeader("origin");
        if(allowOrigins.contains(originHeads)){
            response.setHeader("Access-Control-Allow-Origin", originHeads);
            response.setHeader("Access-Control-Allow-Methods", "POST,GET,OPTIONS,DELETE,HEAD,PUT,PATCH");
            response.setHeader("Access-Control-Max-Age", "36000");
            response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, Connection, User-Agent, Cookie");
            response.setHeader("Access-Control-Allow-Credentials","true");
        }
        chain.doFilter(req, response);
    }

    @Override
    public void init(FilterConfig arg0) throws ServletException {
        // TODO Auto-generated method stub
        
    }



}

2. 編輯web.xml，配置自定義過濾器

<!-- 設置允許跨域  視情況而定是否需要支持跨域-->
	<filter>
		<filter-name>CORSFilter</filter-name>
		<filter-class>com.demo.cxf.restful.filter.CORSFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>CORSFilter</filter-name>
		<url-pattern>/service/*</url-pattern>
	</filter-mapping>