跨域问题（CORS / Access-Control-Allow-Origin）

添加响应头

在被请求资源中添加响应头信息"Access-Control-Allow-Origin：*

过滤器

在本项目中添加如下过滤器：

<span style="color: #008000;">/**</span><span style="color: #008000;">
 * 解决跨域问题
 </span><span style="color: #008000;">*/</span>
<span style="color: #0000ff;">public</span> <span style="color: #0000ff;">class</span> AccessControlAllowOriginFilter <span style="color: #0000ff;">implements</span><span style="color: #000000;"> Filter {
 
    </span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span> doFilter(ServletRequest req, ServletResponse res, FilterChain chain) <span style="color: #0000ff;">throws</span><span style="color: #000000;"> IOException, ServletException {
        HttpServletResponse response </span>=<span style="color: #000000;"> (HttpServletResponse) res;
        response.setHeader(</span>"Access-Control-Allow-Origin", "*"<span style="color: #000000;">);
        response.setHeader(</span>"Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE"<span style="color: #000000;">);
        response.setHeader(</span>"Access-Control-Allow-Credentials", "true"<span style="color: #000000;">);
 
　　　　 chain.doFilter(req, response);
   } 
 
   </span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> init(FilterConfig filterConfig) {
 
   } 
 
   </span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> destroy() {
 
   } 
 
}</span>

注解方式

<code class="hljs python"><span class="hljs-number"><span class="hljs-number"><span class="hljs-keyword"><span class="hljs-keyword">在Spring Boot中拥有大量的注解，针对跨域问题，也提供了对应的注解@CrossOrigin，使用方法如下：<br><br></span></span></span></span></code>

<span style="color: #0000ff;">import</span><span style="color: #000000;"> java.util.HashMap;
 
</span><span style="color: #0000ff;">import</span><span style="color: #000000;"> org.springframework.web.bind.annotation.CrossOrigin;
</span><span style="color: #0000ff;">import</span><span style="color: #000000;"> org.springframework.web.bind.annotation.RequestMapping;
</span><span style="color: #0000ff;">import</span><span style="color: #000000;"> org.springframework.web.bind.annotation.RequestMethod;
</span><span style="color: #0000ff;">import</span><span style="color: #000000;"> org.springframework.web.bind.annotation.RequestParam;
</span><span style="color: #0000ff;">import</span><span style="color: #000000;"> org.springframework.web.bind.annotation.RestController;
 
</span><span style="color: #008000;">/**</span><span style="color: #008000;">
 * </span><span style="color: #808080;">@author</span><span style="color: #008000;"> xcbeyond
 </span><span style="color: #008000;">*/</span><span style="color: #000000;">
@RestController
@RequestMapping(value </span>= "/api", method =<span style="color: #000000;"> RequestMethod.POST)
</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">class</span><span style="color: #000000;"> DemoController {
        
    @CrossOrigin(origins </span>= "*"<span style="color: #000000;">)
    @RequestMapping(value </span>= "/get"<span style="color: #000000;">)
    </span><span style="color: #0000ff;">public</span><span style="color: #000000;"> String get() {
        ……
    }
}</span>

PS:本文转载自：https://blog.csdn.net/xcbeyond/article/details/84453832

跨域问题（CORS / Access-Control-Allow-Origin）

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