一、如果项目中使用的SpringMVC4.3.9以下，就需要对该请求配置Filter，设置请求头可支持跨域。使用方法：
--spring cloud zuul支持跨域---：https://blog.csdn.net/XinTeng2012/article/details/84938872
1、web.xml配置
<!-- 跨域问题解决 -->
<filter>
<filter-name>header</filter-name>
<filter-class>com.foriseland.fsoa.pay.filter.HeaderFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>header</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
2、编写Filter拦截请求，添加跨域请求支持
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; /**
* 头部过滤器
* @author
*/
public class HeaderFilter implements Filter{ public void destroy() { } public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest)req;
HttpServletResponse response = (HttpServletResponse) res;
String originHeader = request.getHeader("Origin");
response.setHeader("Access-Control-Allow-Origin", originHeader);
response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
response.setHeader("Access-Control-Max-Age", "0");
response.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");
response.setHeader("Access-Control-Allow-Credentials", "true");
response.setHeader("XDomainRequestAllowed","1");
chain.doFilter(request, response);
} public void init(FilterConfig arg0) throws ServletException { }
}
二、如果项目中使用的SpringMVC4.x以上，那就简单了，从SpringMVC4.x开始，就增加了支持跨域访问。使用方法：
1、某个方法支持跨域访问
在方法上增加@CrossOrigin注解，如下：
@CrossOrigin(origins = "http://domain2.com", maxAge = 3600)
@RestController
@RequestMapping("/account")
public class AccountController { @GetMapping("/{id}")
public Account retrieve(@PathVariable Long id) {
// ...
} @DeleteMapping("/{id}")
public void remove(@PathVariable Long id) {
// ...
}
}
其中@CrossOrigin中的2个参数：
origins ： 允许可访问的域列表
List of allowed origins, e.g. "http://domain1.com".
These values are placed in the Access-Control-Allow-Origin header of both the pre-flight response and the actual response. "*" means that all origins are allowed. If undefined, all origins are allowed.
maxAge：准备响应前的缓存持续的最大时间（以秒为单位）。。
The maximum age (in seconds) of the cache duration for pre-flight responses.
This property controls the value of the Access-Control-Max-Age header in the pre-flight response. Setting this to a reasonable value can reduce the number of pre-flight request/response interactions required by the browser. A negative value means undefined. If undefined, max age is set to 1800 seconds (i.e., 30 minutes).
2、整个Controller都支持跨域访问，在类上面加上注解@CrossOrigin，如下：
@Controller
@CrossOrigin
public class TestController {
……
……
}
3、自定义规则支持全局跨域访问，在spring-mvc.xml文件中配置映射路径，如下：
<mvc:cors>
<mvc:mapping path="/cross/*"/>
</mvc:cors>
如果整个项目所有方法都可以访问，则可以这样配置
<mvc:cors>
<mvc:mapping path="/**"/>
</mvc:cors>
其中* 表示匹配到下一层
** 表示后面不管有多少层，都能匹配。
上面表示有/cross/路径的请求都支持跨域访问，也可以增加其它的，如下：
<mvc:cors>
<mvc:mapping path="/cross/**" allowed-origins="" max-age="2500"/>
<mvc:mapping path="/domain/**"/>
</mvc:cors>
请求路径有/cross/，方法示例如下：
@RequestMapping("/cross/crossDomain")
@ResponseBody
public String crossDomain(HttpServletRequest req, HttpServletResponse res, String name){
……
……
}