java後臺圖片上傳預檢失敗解決方案

 

 

 

1.首先由於服務器端會先發送一個option請求到後臺  在後臺返回一個post給頁面 頁面在處理post請求給接口 

2.先寫一個過濾器, 咱們本身定義一個過濾器

 

 

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裏面配置過濾器

 

<!-- 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.過濾器會自動過濾options請求  而後就能夠直接跨域訪問接口了