方法一：@CrossOrigin注解的方法，只能作用在一个Controller层
直接在Controller类或方法前加上@CrossOrigin注解即可允许所有ip跨域访问
加在Controller类上表示该Controller的所有方法都支持跨域
加在Controller中的方法上表示仅该方法支持跨域
@CrossOrigin // 允许所有ip跨域 @CrossOrigin(origins = "192.168.0.1") //只允许指定ip跨域方法二：在SpringMVC配置文件spring-context.xml中配置跨域请求
<!-- 接口跨域配置 --> <mvc:cors> <!-- allowed-methods="*" --> <!-- 表示所有请求都有效 --> <mvc:mapping path="/**" allowed-origins="*" allowed-methods="POST, GET, OPTIONS, DELETE, PUT" allowed-headers="Content-Type, Access-Control-Allow-Headers, Authorization, X-Requested-With" allow-credentials="true" /> </mvc:cors>方法三：使用cors-filter包配置跨域
1、引入pom.xml依赖
<!-- cors-filter包：配置跨域 --> <dependency> <groupId>com.thetransactioncompany</groupId> <artifactId>cors-filter</artifactId> <version>2.5</version> </dependency>2、在web.xml文件中注册Filter跨域过滤器
<!-- 配置跨域过滤器 --> <filter> <filter-name>CORS</filter-name> <filter-class>com.thetransactioncompany.cors.CORSFilter</filter-class> <init-param> <param-name>cors.allowOrigin</param-name> <param-value>*</param-value> </init-param> <init-param> <param-name>cors.supportedMethods</param-name> <!-- <param-value>*</param-value> --> <!-- 表示所有请求都有效 --> <param-value>GET, POST, HEAD, PUT, DELETE</param-value> </init-param> <init-param> <param-name>cors.supportedHeaders</param-name> <param-value>Accept, Origin, X-Requested-With, Content-Type, Last-Modified</param-value> </init-param> <init-param> <param-name>cors.exposedHeaders</param-name> <param-value>Set-Cookie</param-value> </init-param> <init-param> <param-name>cors.supportsCredentials</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>CORS</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>方法四：自己写CrossingFilter跨域过滤器
1、写CrossingFilter过滤器类，实现(Interfaces)本地Apache Tomcat的Filter接口
package com.pmsapi.filter; 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.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class CrossingFilter implements Filter { private boolean isCross = false; @Override public void destroy() { isCross = false; } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { if (isCross) { HttpServletRequest httpServletRequest = (HttpServletRequest) request; HttpServletResponse httpServletResponse = (HttpServletResponse) response; System.out.println("拦截请求: " + httpServletRequest.getServletPath()); httpServletResponse.setHeader("Access-Control-Allow-Origin", "*"); // httpServletResponse.setHeader("Access-Control-Allow-Methods", "*"); // 表示所有请求都有效 httpServletResponse.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE"); httpServletResponse.setHeader("Access-Control-Max-Age", "0"); httpServletResponse.setHeader("Access-Control-Allow-Headers", "Origin, No-Cache, X-Requested-With, If-Modified-Since, Pragma, Last-Modified, Cache-Control, Expires, Content-Type, X-E4M-With,userId,token"); httpServletResponse.setHeader("Access-Control-Allow-Credentials", "true"); httpServletResponse.setHeader("XDomainRequestAllowed", "1"); } chain.doFilter(request, response); } @Override public void init(FilterConfig filterConfig) throws ServletException { String isCrossStr = filterConfig.getInitParameter("IsCross"); isCross = isCrossStr.equals("true") ? true : false; System.out.println("跨域开启状态：" + isCrossStr); } }2、在web.xml文件中注册CrossingFilter过滤器
<!-- 配置跨域过滤器 --> <filter> <filter-name>CrossingFilter</filter-name> <filter-class>com.pmsapi.filter.CrossingFilter</filter-class> <init-param> <param-name>IsCross</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>CrossingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
