利用注解的方式解决AJAX请求跨域问题

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1.编写一个支持跨域请求的 Configuration

- 第一种方式

- CorsConfig.java

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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

- HelloController.java

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

- 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

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@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);
 }
}

- index.html

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<!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>
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