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一.方法:
二.實例:
1.前端:因為我們用了前后端分離,前端用node服務器,node服務器再用了ajax反向代理請求到我的spring boot 服務器。其中node服務器也用了ajax發出請求所以也存在跨域的問題。具體代碼:
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;
}
}));
后臺(用的是spring boot 1.3.7.RELEASE) :用了一個filter進行了身份驗證同時進行了跨域處理，具體代碼:
public class AuthFilter implements Filter {
// @Autowired
//這個不能自動注入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");
//不能在初始化中通過Appliaction Context獲取因為這時候還沒初始化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;
//這里填寫你允許進行跨域的主機ip
httpServletResponse.setHeader("Access-Control-Allow-Origin", "*");
//允許的訪問方法
httpServletResponse.setHeader("Access-Control-Allow-Methods", "POST, GET, PUT, OPTIONS, DELETE, PATCH");
//Access-Control-Max-Age 用于 CORS 相關配置的緩存
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");
}
}
這種方法還適用于servlet中,特別注意的是一定要在filter動作之前加上這句話,也就是在代碼的最前面加上這個話。
跨域資源共享 CORS 詳解(相關鏈接)
2.詳細請看(點開)
3.具體代碼:
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);
}
}
這里有個坑spring boot 以前的版本這樣設置可以用但是 我用的1.3.7.RELEASE spring boot 不能用,所以用第二種方式是萬能的
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