SpringMVC支持跨域请求

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.****.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){

    ……  　　

    ……

}

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