前后端分离ssm配置跨域

前后端分离开发需要跨域，之前只会pringboot跨域，只需要一个配置类即可，下面记录一下ssm的配置

### 三个文件需要添加配置


## SimpleCORSFilter.java实现Filte

```

public class SimpleCORSFilter 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", "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(isCrossStr);

}

```

## dispatcher-servlet.xml(springMVC的配置文件)

```

<!-- 接口跨域配置-->

<mvc:cors>

<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>

```

## web.xml

```

<!-- 跨域请求 -->

<filter>

<filter-name>SimpleCORSFilter</filter-name>

<filter-class>com.maxcore.config.SimpleCORSFilter</filter-class>

<init-param>

<param-name>IsCross</param-name>

<param-value>true</param-value>

</init-param>

</filter>

<filter-mapping>

<filter-name>SimpleCORSFilter</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

```

## 完毕

>[github](https://github.com/pbw123/)