如何在Spring Boot中启用CORS-不工作[重复]

Question

null

我的代码

控制器

@RestController
public class DbController {

    @Autowired
    private IDAO conn;

    @CrossOrigin
    @GetMapping("/foo")
    public List<Foo> getFoo() {
        return conn.getFooFromDao();
    }
}

刀

    @Repository
    public class DaoImpl implements IDAO {

    @Autowired
    private JdbcTemplate temp;

    public List<Foo> getFooFromDao() {

        List<Foo> data = new ArrayList<>();

        String sql = "SELECT fooName FROM BigFoo ORDER BY fooName ASC;";

        data.addAll(temp.query(sql, new BeanPropertyRowMapper(BigFoo.class)));
        return data;
    }
}

getFoo() {
    return this.http.get("localhost:8080/foo");
  }

我正在使用HttpClient从导入{HttpClient}从“@angull/common/http”；

我还通过将URL复制粘贴到我的浏览器中来验证URL在该服务方法中是否有效。它确实会返回JSON，这省略了错误URL或错误的可能性。

Answer 1

把你的交叉原点放在控制器层本身

@RestController
@CrossOrigin(origins = "*")
public class DbController {

    @Autowired
    private IDAO conn;

    @GetMapping("/foo")
    public List<Foo> getFoo() {
        return conn.getFooFromDao();
    }
}

这是spring推荐的直接解决方案，您也可以定义一个过滤器，它将允许所有响应的来源交叉

@Component
public class SimpleCORSFilter implements Filter {

private final Logger log = LoggerFactory.getLogger(SimpleCORSFilter.class);

public SimpleCORSFilter() {
    log.info("SimpleCORSFilter init");
}

@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {

    HttpServletRequest request = (HttpServletRequest) req;
    HttpServletResponse response = (HttpServletResponse) res;

    response.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));
    response.setHeader("Access-Control-Allow-Credentials", "true");
    response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
    response.setHeader("Access-Control-Max-Age", "3600");
    response.setHeader("Access-Control-Allow-Headers", "Content-Type, Accept, X-Requested-With, remember-me");

    chain.doFilter(req, res);
}

  @Override
  public void init(FilterConfig filterConfig) {}

  @Override
  public void destroy() {}

}

您还需要知道，您在代码快照中没有提到协议http或https，您还没有发送GET请求，当您开始订阅它时，该请求将被发送，如下所示

getFoo() {
    return this.http.get("http://localhost:8080/foo");
}

getFoo().subscribe(resp -> { // your logic });

// or directly inside getFoo() like this 
getFoo() {
    return this.http.get("http://localhost:8080/foo")
    .subscribe(resp -> { // your logic });
}