java解決請求跨域問題，有以下幾種方法

1.使用攔截器，實現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" , "*" ); //解決跨域訪問報錯

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

   response.setHeader( "Access-Control-Max-Age" , "3600" ); //設置過期時間

   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的形式配置攔截器，可以刪除@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項目多數使用這種方式

 

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;

 

/**

  * 解決跨域問題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) 允許的域,不要寫*，否則cookie就無法使用了

  config.addAllowedOrigin( "*" );

  config.addAllowedHeader( "*" ); // 允許任何頭

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

  //2) 是否發送Cookie信息

  config.setAllowCredentials( true );

  //3) 允許的請求方式

  config.addAllowedMethod( "OPTIONS" );

  config.addAllowedMethod( "HEAD" );

  config.addAllowedMethod( "GET" );

  config.addAllowedMethod( "PUT" );

  config.addAllowedMethod( "POST" );

  config.addAllowedMethod( "DELETE" );

  config.addAllowedMethod( "PATCH" );

  // 4）允許的頭信息

  config.addAllowedHeader( "*" );

 

  // 5)配置有效時長

  config.setMaxAge( 3600 *24L);

 

  //2.添加映射路徑，我們攔截一切請求

  UrlBasedCorsConfigurationSource configSource = new UrlBasedCorsConfigurationSource();

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

 

  //3.返回新的CorsFilter.

  return new CorsFilter(configSource);

  }

}

 

 

另外參考其他的解決方法

https://blog.csdn.net/yue29026/article/details/70860719/

https://blog.csdn.net/sky786905664/article/details/79183856(符合我項目的情況，已使用）

https://cloud.tencent.com/developer/article/1450192