如何将 ResponseEntity 写到 HttpServletResponse？例

java spring

2022-09-01 21:13:21

如何将ResponserEntity写到HttpServletResponse（因为它使@ResponseBody）？

例如，我有身份验证成功处理程序：

@Override
public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response, Authentication authentication) throws IOException, ServletException {
    Map responseMap = new HashMap();
    responseMap.put("user", "my_user_name");
    ResponseEntity responseEntity = new ResponseEntity(response, HttpStatus.OK);
}

如果使用 MappingJackson2HttpMessageConverter，我会遇到错误：“无法写入内容：未处于非阻塞模式。

法典：

HttpOutputMessage outputMessage = new ServletServerHttpResponse(response);
messageConverter.write(responseEntity, null, outputMessage);

使用 HttpServletResponse 实现处理程序的最佳实践是什么？

答案 1

您可以使用自定义响应对象，使用 Jackson 的 ObjectMapper 将其转换为 JSON 字符串，然后将结果写入请求。

例

我的响应对象.java

private String user;

public String getUser() {
    return user;
}

public void setUser(String user) {
    this.user = user;
}

MyAuthenticationSuccessHandler.java

@Override
public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response, Authentication authentication) throws IOException, ServletException {
    MyResponseObject responseObj = new MyResponseObject();
    responseObj.setUser("my_user_name");

    String json = new ObjectMapper().writeValueAsString(responseObj);

    httpServletResponse.setStatus(HttpStatus.OK.value());
    httpServletResponse.getWriter().write(json);
    httpServletResponse.flushBuffer();
}

答案 2

基于andrearro88的答案，我制作了这个通用函数来复制一个：ResponseEntityHttpServletResponse

public static void populateResponse(ResponseEntity<String> responseEntity, HttpServletResponse servletResponse)
        throws IOException {
    for (Map.Entry<String, List<String>> header : responseEntity.getHeaders().entrySet()) {
        String chave = header.getKey();
        for (String valor : header.getValue()) {
            servletResponse.addHeader(chave, valor);                
        }
    }

    servletResponse.setStatus(responseEntity.getStatusCodeValue());
    servletResponse.getWriter().write(responseEntity.getBody());
}