java解决请求跨域的两种方法

java解决请求跨域问题,有以下两种写法

1.使用拦截器,实现javax.servlet.Filter接口

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;

@WebFilter(filterName="CorsFilter" , urlPatterns="*.do")

public class CorsFilter implements Filter{

@Override

public void destroy() {

}

@Override

public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)

throws IOException, ServletException {

HttpServletResponse response = (HttpServletResponse) resp;

response.setHeader("Access-Control-Allow-Origin", "*"); //解决跨域访问报错

response.setHeader("Access-Control-Allow-Methods", "POST, PUT, GET, OPTIONS, DELETE");

response.setHeader("Access-Control-Max-Age", "3600"); //设置过期时间

response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, client_id, uuid, Authorization");

response.setHeader("Cache-Control", "no-cache, no-store, must-revalidate"); // 支持HTTP 1.1.

response.setHeader("Pragma", "no-cache"); // 支持HTTP 1.0. response.setHeader("Expires", "0");

chain.doFilter(req, resp);

}

@Override

public void init(FilterConfig arg0) throws ServletException {

}

}

如果想用xml的形式配置拦截器,可以删除@WebFilter(filterName="CorsFilter" , urlPatterns="*.do"),然后在web.xml中添加下面的配置

<filter>

<filter-name>CorsFilter</filter-name>

<filter-class>com.huaming.filter.CorsFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>CorsFilter</filter-name>

<url-pattern>*.do</url-pattern>

</filter-mapping>

2.使用注解的形式,配置org.springframework.web.filter.CorsFilter,通常springboot项目多数使用这种方式

import org.springframework.web.filter.CorsFilter;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import org.springframework.web.cors.CorsConfiguration;

import org.springframework.web.cors.UrlBasedCorsConfigurationSource;

/**

* 解决跨域问题springboot所需配置

*/

@Configuration

public class CORSConfiguration {

@Bean

public CorsFilter corsFilter() {

//1.添加CORS配置信息

CorsConfiguration config = new CorsConfiguration();

//1) 允许的域,不要写*,否则cookie就无法使用了

config.addAllowedOrigin("*");

config.addAllowedHeader("*"); // 允许任何头

config.addAllowedMethod("*"); // 允许任何方法(post、get等)

//2) 是否发送Cookie信息

config.setAllowCredentials(true);

//3) 允许的请求方式

config.addAllowedMethod("OPTIONS");

config.addAllowedMethod("HEAD");

config.addAllowedMethod("GET");

config.addAllowedMethod("PUT");

config.addAllowedMethod("POST");

config.addAllowedMethod("DELETE");

config.addAllowedMethod("PATCH");

// 4)允许的头信息

config.addAllowedHeader("*");

// 5)配置有效时长

config.setMaxAge(3600*24L);

//2.添加映射路径,我们拦截一切请求

UrlBasedCorsConfigurationSource configSource = new UrlBasedCorsConfigurationSource();

configSource.registerCorsConfiguration("/**", config);

//3.返回新的CorsFilter.

return new CorsFilter(configSource);

}

}

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