SpringBoot解决ajax跨域问题的方法

SpringBoot解决ajax跨域，供大家参考，具体内容如下

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" };
  @Override
  public void addCorsMappings(CorsRegistry registry) {
    registry.addMapping("/**").allowedOrigins("*").allowCredentials(true).allowedMethods(ORIGINS)
        .maxAge(3600);
  }
}

2、HTTP请求接口

@RestController
public class HelloController {

  @Autowired
  HelloService 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
   */
  @Bean
  public CorsFilter corsFilter() {
    UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
    source.registerCorsConfiguration("/**", buildConfig()); // 4
    return 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 {

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

  }

  @Override
  public 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);
  }

  @Override
  public 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。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持呐喊教程。

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