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  • java后台图片上传预检失败解决方案

    1.首先因为服务器端会先发送一个option请求到后台  在后台返回一个post给页面 页面在处理post请求给接口 

    2.先写一个过滤器, 我们自己定义一个过滤器

    package com.adtime.dsp.web.controller;

    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;

    import org.springframework.stereotype.Component;

    /**
    * Created by kangb on 2016/5/10.
    */

    public class myCORSFilter implements Filter {

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

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
    HttpServletResponse response = (HttpServletResponse) servletResponse;
    String origin = (String) servletRequest.getRemoteHost()+":"+servletRequest.getRemotePort();
    response.setHeader("Access-Control-Allow-Origin", "*");
    response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
    response.setHeader("Access-Control-Max-Age", "3600");
    response.setHeader("Access-Control-Allow-Headers", "x-requested-with,Authorization");
    response.setHeader("Access-Control-Allow-Credentials","true");
    filterChain.doFilter(servletRequest, servletResponse);
    }

    @Override
    public void destroy() {

    }
    }

    3.在web.xml里面配置过滤器

    <!-- options 403 -->
    <filter>
    <filter-name>cors</filter-name>
    <filter-class>com.adtime.dsp.web.controller.myCORSFilter</filter-class>
    </filter>
    <filter-mapping>
    <filter-name>cors</filter-name>
    <url-pattern>/*</url-pattern>
    </filter-mapping>

    4.过滤器会自动过滤options请求  然后就可以直接跨域访问接口了

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  • 原文地址:https://www.cnblogs.com/DarkInNight/p/9321719.html
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