来自spring boot rest控制器的JSON响应重复

Question

我试图用Spring boot 1.5.9.RELEASE来构建一个rest api，却被这个问题卡住了。对apiendpoint的post请求工作得很好，但是当到达get请求时，结果会重复。应用程序对get请求产生的响应是

{"data":["Administrator"]}{"data":["Administrator"]}

关联的请求映射类代码

@RequestMapping("/get")
    public ResponseEntity getAllRoles()throws Exception{

        List<Roles> roles = rolesService.getRoles();
        Set<String> roleNames = new HashSet<>();
        for(Roles r : roles)
            roleNames.add(r.getRoleName());
        return new ResponseEntity(new Response(roleNames), HttpStatus.OK);
    }

响应类

public class Response<T> {

    private T data;

    public Response() {}

    public Response(T data) {
            this.data = data;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }
}

对如何解决这个问题有什么想法吗？预先感谢

Answer 1

您正在创建响应两次，请在下面使用

RequestMapping("/get")
    public ResponseEntity<?> getAllRoles()throws Exception{

        List<Roles> roles = rolesService.getRoles();
        Set<String> roleNames = new HashSet<>();
        for(Roles r : roles)
            roleNames.add(r.getRoleName());
        return new ResponseEntity<Object>(roleNames, HttpStatus.OK);
    }