原本Spring MVC项目添加跨域:
在web.xml文件中配置:
<!-- cors解决跨域访问问题 -->
<filter>
<filter-name>cors</filter-name>
<filter-class>com.wazn.learn.util.SimpleCORSFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>cors</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
工具类代码:
package com.wazn.learn.util;
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.annotation.WebFilter;
import javax.servlet.http.HttpServletResponse;
public class SimpleCORSFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println("SimpleCORSFilter启动!!!===========");
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
HttpServletResponse res = (HttpServletResponse)response;
res.setHeader("Access-Control-Allow-Origin", "*");
res.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
res.setHeader("Access-Control-Max-Age", "3600");
res.setHeader("Access-Control-Allow-Headers", "x-requested-with");
chain.doFilter(request, response);
}
@Override
public void destroy() {
System.out.println("SimpleCORSFilter结束!!!===========");
}
}
这种方法还适用于Servlet中,特别注意的是一定要在Filter动作之前加上这句话,也就是在代码的最前面加上这个话。
这里有个坑,Spring Boot以前的版本这样设置可以用Filter,但是在1.3.7.RELEASE不能用,所以用第二种方式是万能的。
package agriculture_basedata.util;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
@Configuration
public class CorsConfig extends WebMvcConfigurerAdapter {
@Override
public void addCorsMappings(CorsRegistry registry) {
registry.addMapping("/**")
.allowedOrigins("*")
.allowCredentials(true)
.allowedMethods("GET", "POST", "DELETE", "PUT")
.maxAge(3600);
}
}
这个方法是万能的
这里在spring boot项目中应用的,所以没有其他配置文件,复制该代码就好了