后端使用Response出现的跨域问题
今天联调文件下载的接口，由于自己用postman测试一直都没问题，但是在和前端联调的时候前端就会出现如下跨域的报错
@ApiOperation("下载附件")
@PostMapping(value = "/download")
public void downloadFile(@RequestBody List
ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes)RequestContextHolder.getRequestAttributes();
HttpServletResponse response = servletRequestAttributes.getResponse();
FileBinary fileBinary= fileReportApiClient.download(fileId);
byte[] bytes = fileBinary.getData();
try {
// 清空response
// response.reset();
response.setContentType("application/octet-stream;charset=UTF-8");
response.setCharacterEncoding("UTF-8");
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(new Date().getTime() + ".zip", "utf-8"));
OutputStream ouputStream = response.getOutputStream();
ouputStream.write(bytes);
ouputStream.flush();
ouputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
项目的框架本身就是加了跨域处理的
@Configuration
public class CorsConfig {
@Bean
public CorsFilter corsFilter() {
CorsConfiguration config = new CorsConfiguration();
config.addAllowedOriginPattern("*");
config.setAllowCredentials(true);
config.addAllowedMethod("*");
config.addAllowedHeader("*");
UrlBasedCorsConfigurationSource configSource = new UrlBasedCorsConfigurationSource();
configSource.registerCorsConfiguration("/**", config);
return new CorsFilter(configSource);
}
}
但response.reset()的时候把它给重置了，因此就造成前端无法下载并报跨域问题。于是尝试在reset（）下面加上这几行代码，就可以解决跨域问题了。但是由于我已经配置了跨域，就直接把response.reset();去掉就好了
response.addHeader("Access-Control-Allow-Origin", "*");
response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE");
response.addHeader("Access-Control-Allow-Headers", "Content-Type");