Spring MVC 跨域

在写Spring MVC项目的时候，有时候会出现跨域访问的问题，下面介绍一种解决跨域访问问题的方法。
1.建立CorsFilter类，并实现Filter接口

package cn.edu.bupt.springmvc.web.config;

import javax.servlet.*;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * TODO:
 *
 * @author: 林贻民
 * @date: 2017.10.25
 * @Description: 允许跨域访问
 */
public class CorsFilter implements Filter {

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

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletResponse httpResponse = (HttpServletResponse) servletResponse;
        httpResponse.addHeader("Access-Control-Allow-Origin", "*");
        httpResponse.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
        httpResponse.setHeader("Access-Control-Allow-Methods", "GET, PUT, DELETE, POST");
        filterChain.doFilter(servletRequest, servletResponse);
    }

    @Override
    public void destroy() {
    }
}

2.在web.xml中添加filter

<!-- 支持跨域 -->
    <filter>
        <filter-name>CorsFilter</filter-name>
        <filter-class>cn.edu.bupt.springmvc.web.config.CorsFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>CorsFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

这样就可以解决跨域问题了。