一.方法:
二.实例:
1.前端:因为我们用了前后端分离,前端用node服务器,node服务器再用了ajax反向代理请求到我的spring boot 服务器。其中node服务器也用了ajax发出请求所以也存在跨域的问题。具体代码:
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app.all(apiRoot + '/*', proxy('127.0.0.1:' + proxyPort, {
forwardPath: function(req, res) {
console.log('req: ', req, 'res; ', res);
return require('url').parse(req.url).path;
}
}));后台(用的是spring boot 1.3.7.RELEASE) :用了一个filter进行了身份验证同时进行了跨域处理，具体代码:
public class AuthFilter implements Filter {
// @Autowired
//这个不能自动注入servlet和filter是被tomcat管理的
private BaseUserService baseUserService;
private String[] excludePaths;
@Override
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println("initFilter");
//不能在初始化中通过Appliaction Context获取因为这时候还没初始化Application Context
//baseUserService = SpringUtils.getBean("baseUserService", BaseUserService.class);
excludePaths = new String[]{"/api/user/noLogin", "/api/user/tokenError", "/api/user/loginForeground",
"/api/user/loginBackground", "/api/user/inCorrectUserId"};
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
HttpServletRequest httpServletRequest = (HttpServletRequest) request;
HttpServletResponse httpServletResponse = (HttpServletResponse) response;
//这里填写你允许进行跨域的主机ip
httpServletResponse.setHeader("Access-Control-Allow-Origin", "*");
//允许的访问方法
httpServletResponse.setHeader("Access-Control-Allow-Methods", "POST, GET, PUT, OPTIONS, DELETE, PATCH");
//Access-Control-Max-Age 用于 CORS 相关配置的缓存
httpServletResponse.setHeader("Access-Control-Max-Age", "3600");
httpServletResponse.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
String userId = request.getParameter("userId");
String token = request.getParameter("token");
//有token的 `
if (userId != null && token != null) {
try {
Integer id = Integer.parseInt(userId);
if (baseUserService == null)
baseUserService = SpringUtils.getBean("baseUserService", BaseUserService.class);
int status = baseUserService.checkLogin(id, token);
if (status == 1) {
chain.doFilter(request, response);
} else if (status == 0) {
httpServletResponse.sendRedirect("/api/user/tokenError");
} else if (status == -2) {
httpServletResponse.sendRedirect("/api/user/inCorrectUserId");
} else {
httpServletResponse.sendRedirect("/api/user/noLogin");
}
} catch (NumberFormatException exception) {
httpServletResponse.sendRedirect("/api/user/inCorrectUserId");
}
} else {
String path = httpServletRequest.getServletPath();
if (excludePath(path)) {
chain.doFilter(request, response);
} else {
httpServletRequest.getRequestDispatcher("/api/user/noLogin").forward(request, response);
}
}
// ((HttpServletResponse) response).addHeader("Access-Control-Allow-Origin", "*");
// CorsFilter corsFilter=new CorsFilter();
}
private boolean excludePath(String path) {
for (int i = 0; i < excludePaths.length; i++) {
if (path.equals(excludePaths[i]))
return true;
}
return false;
}
@Override
public void destroy() {
System.out.println("destroy method");
}
}
这种方法还适用于servlet中,特别注意的是一定要在filter动作之前加上这句话,也就是在代码的最前面加上这个话。
跨域资源共享 CORS 详解(相关链接)
2.详细请看(点开)
3.具体代码:
package edu.ecnu.yjsy.conf;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
@Configuration
public class CorsConfig extends WebMvcConfigurerAdapter {
@Override
public void addCorsMappings(CorsRegistry registry) {
registry.addMapping("/**")
.allowedOrigins("*")
.allowCredentials(true)
.allowedMethods("GET", "POST", "DELETE", "PUT")
.maxAge(3600);
}
}
这里有个坑spring boot 以前的版本这样设置可以用但是 我用的1.3.7.RELEASE spring boot 不能用,所以用第二种方式是万能的
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