使用 Spring 3.0.4 启用 Cors

Question

我正在使用 Java Spring 3.0.4（由于某些要求而无法升级），并且我需要启用 Cors 以便我的前端能够与后端对话。

我的后端是一个运行在以下位置的角度应用程序：http://localhost:4200/home

我尝试了以下方法但没有成功：

public static final String CREDENTIALS_NAME = "Access-Control-Allow-Credentials";
public static final String ORIGIN_NAME = "Access-Control-Allow-Origin";
public static final String METHODS_NAME = "Access-Control-Allow-Methods";
public static final String HEADERS_NAME = "Access-Control-Allow-Headers";
public static final String MAX_AGE_NAME = "Access-Control-Max-Age";

@PreAuthorize("hasRole('ADMIN')")
@RequestMapping(value="/data", method=RequestMethod.GET)
public void serverSide(Model model,  HttpServletRequest request, HttpServletResponse response) throws IOException{

    response.setContentType("application/json");
    response.setHeader("Cache-Control", "no-store");

    response.setHeader(CREDENTIALS_NAME, "true");
    response.setHeader(ORIGIN_NAME, "http://localhost:4200");
    response.setHeader(METHODS_NAME, "GET, OPTIONS, POST, PUT, DELETE");
    response.setHeader(HEADERS_NAME, "Origin, X-Requested-With, Content-Type, Accept");
    response.setHeader(MAX_AGE_NAME, "3600");

    PrintWriter out = response.getWriter();

    out.print("TEST!!");
}       

Answer 1

您可以扩展Filter接口。

public class CORSFilter implements Filter {

  @Override
  public void init(FilterConfig filterConfig) throws ServletException {

  }

  @Override
  public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
      HttpServletResponse httpResponse = (HttpServletResponse) response;
      httpResponse.addHeader("Access-Control-Allow-Origin", "*");
      httpResponse.addHeader("Access-Control-Allow-Methods", "POST, GET, PUT, UPDATE, OPTIONS");
      httpResponse.setHeader("Access-Control-Allow-Headers", "X-Requested-With, X-Auth-Token");       chain.doFilter(request, response);
  }

  @Override
  public void destroy() {

  }
}

然后你需要注册过滤器web.xml

<filter>
    <filter-name>cors</filter-name>
    <filter-class>com.yourpackage.CORSFilter</filter-class>
</filter>

<filter-mapping>
    <filter-name>cors</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>