SpringBoot解决ajax跨域问题

From: https://www.jianshu.com/p/e57ed1ee3070

利用注解的方式解决AJAX请求跨域问题

一、第一种方式:

1、编写一个支持跨域请求的 Configuration

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;/*** 处理AJAX请求跨域的问题* @author Levin* @time 2017-07-13*/
@Configuration
public class CorsConfig extends WebMvcConfigurerAdapter {static final String ORIGINS[] = new String[] { "GET", "POST", "PUT", "DELETE" };@Overridepublic void addCorsMappings(CorsRegistry registry) {registry.addMapping("/**").allowedOrigins("*").allowCredentials(true).allowedMethods(ORIGINS).maxAge(3600);}
}

2、HTTP请求接口

@RestController
public class HelloController {@AutowiredHelloService helloService;@GetMapping(value = "/test", produces = MediaType.APPLICATION_JSON_UTF8_VALUE)public String query() {return "hello";}
}

二、第二种方式（推荐）

PS：第一种存在一个问题，当服务器抛出 500 的时候依旧存在跨域问题

@SpringBootApplication
@ComponentScan
@EnableDiscoveryClient
public class ManagementApplication {public static void main(String[] args) {SpringApplication.run(ManagementApplication.class, args);}private CorsConfiguration buildConfig() {CorsConfiguration corsConfiguration = new CorsConfiguration();corsConfiguration.addAllowedOrigin("*");corsConfiguration.addAllowedHeader("*");corsConfiguration.addAllowedMethod("*");corsConfiguration.addExposedHeader(HttpHeaderConStant.X_TOTAL_COUNT);return corsConfiguration;}/*** 跨域过滤器** @return*/@Beanpublic CorsFilter corsFilter() {UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();source.registerCorsConfiguration("/**", buildConfig()); // 4return new CorsFilter(source);}
}

2、index.html

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>跨域请求</title>
<script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){$("button").click(function(){$.ajax({url:"http://localhost:8080/test",success:function(result){$("#p1").html(result);}});});
});
</script>
</head>
<body><p width="500px" height="100px" id="p1"></p>
<button>获取其他内容</button>
</body>
</html>

三、第三种方式，编写Filter过滤器

package com.cci.market.common.filter;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.HttpServletResponse;import org.springframework.stereotype.Component;/*** 处理跨域问题* @author MR.ZHENG* @date 2016/08/08**/
@Component
public class OriginFilter implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest req, ServletResponse res,FilterChain chain) throws IOException, ServletException {HttpServletResponse response = (HttpServletResponse) res;response.setHeader("Access-Control-Allow-Origin", "*");response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE,PUT");response.setHeader("Access-Control-Max-Age", "3600");response.setHeader("Access-Control-Allow-Headers", "x-requested-with");chain.doFilter(req, res);}@Overridepublic void destroy() {// TODO Auto-generated method stub}}

四、Nginx跨域配置

Nginx跨域也比较简单，只需添加以下配置即可。

location / {proxy_pass http://localhost:8080;if ($request_method = 'OPTIONS') {add_header 'Access-Control-Allow-Origin' '*';add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range,Token';add_header 'Access-Control-Max-Age' 1728000;add_header 'Content-Type' 'text/plain; charset=utf-8';add_header 'Content-Length' 0;return 204;}if ($request_method = 'POST') {add_header 'Access-Control-Allow-Origin' '*';add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range,Token';add_header 'Access-Control-Expose-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range,Token';}if ($request_method = 'GET') {add_header 'Access-Control-Allow-Origin' '*';add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range,Token';add_header 'Access-Control-Expose-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range,Token';}
}

其中：add_header 'Access-Control-Expose-Headers' 务必加上你请求时所带的header。例如本例中的“Token”，其实是前端传给后端过来的。如果记不得也没有关系，浏览器的调试器会有详细说明。

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