从 spring 异常处理程序读取 httprequest 内容

我正在使用 Spring 的@ExceptionHandler注释来捕获我的控制器中的异常。

有些请求将 POST 数据作为写入请求正文的纯 XML 字符串，我想读取该数据以记录异常。 问题是，当我在异常处理程序中请求输入流并尝试从中读取时，流返回-1（空）。

异常处理程序签名是：

@ExceptionHandler(Throwable.class)
public ModelAndView exception(HttpServletRequest request, HttpServletResponse response, HttpSession session, Throwable arff)

有什么想法吗？有没有办法访问请求正文？

我的控制器：

@Controller
@RequestMapping("/user/**")
public class UserController {

    static final Logger LOG = LoggerFactory.getLogger(UserController.class);

    @Autowired
    IUserService userService;


    @RequestMapping("/user")
    public ModelAndView getCurrent() {
        return new ModelAndView("user","response", userService.getCurrent());
    }

    @RequestMapping("/user/firstLogin")
    public ModelAndView firstLogin(HttpSession session) {
        userService.logUser(session.getId());
        userService.setOriginalAuthority();
        return new ModelAndView("user","response", userService.getCurrent());
    }


    @RequestMapping("/user/login/failure")
    public ModelAndView loginFailed() {
        LOG.debug("loginFailed()");
        Status status = new Status(-1,"Bad login");
        return new ModelAndView("/user/login/failure", "response",status);
    }

    @RequestMapping("/user/login/unauthorized")
    public ModelAndView unauthorized() {
        LOG.debug("unauthorized()");
        Status status = new Status(-1,"Unauthorized.Please login first.");
        return new ModelAndView("/user/login/unauthorized","response",status);
    }

    @RequestMapping("/user/logout/success")
    public ModelAndView logoutSuccess() {
        LOG.debug("logout()");
        Status status = new Status(0,"Successful logout");
        return new ModelAndView("/user/logout/success", "response",status);

    }

    @RequestMapping(value = "/user/{id}", method = RequestMethod.POST)
    public ModelAndView create(@RequestBody UserDTO userDTO, @PathVariable("id") Long id) {
        return new ModelAndView("user", "response", userService.create(userDTO, id));
    }

    @RequestMapping(value = "/user/{id}", method = RequestMethod.GET)
    public ModelAndView getUserById(@PathVariable("id") Long id) {
        return new ModelAndView("user", "response", userService.getUserById(id));
    }

    @RequestMapping(value = "/user/update/{id}", method = RequestMethod.POST)
    public ModelAndView update(@RequestBody UserDTO userDTO, @PathVariable("id") Long id) {
        return new ModelAndView("user", "response", userService.update(userDTO, id));
    }

    @RequestMapping(value = "/user/all", method = RequestMethod.GET)
    public ModelAndView list() {
        return new ModelAndView("user", "response", userService.list());
    }

    @RequestMapping(value = "/user/allowedAccounts", method = RequestMethod.GET)
    public ModelAndView getAllowedAccounts() {
        return new ModelAndView("user", "response", userService.getAllowedAccounts());
    }

    @RequestMapping(value = "/user/changeAccount/{accountId}", method = RequestMethod.GET)
    public ModelAndView changeAccount(@PathVariable("accountId") Long accountId) {
        Status st = userService.changeAccount(accountId);
        if (st.code != -1) {
            return getCurrent();
        }
        else {
            return new ModelAndView("user", "response", st);
        }
    }
    /*
    @RequestMapping(value = "/user/logout", method = RequestMethod.GET)
    public void perLogout(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        userService.setOriginalAuthority();
        response.sendRedirect("/marketplace/user/logout/spring");
    }
     */

    @ExceptionHandler(Throwable.class)
public ModelAndView exception(HttpServletRequest request, HttpServletResponse response, HttpSession session, Throwable arff) {
    Status st = new Status();
    try {
        Writer writer = new StringWriter();
        byte[] buffer = new byte[1024];

        //Reader reader2 = new BufferedReader(new InputStreamReader(request.getInputStream()));
        InputStream reader = request.getInputStream();
        int n;
        while ((n = reader.read(buffer)) != -1) {
            writer.toString();

        }
        String retval = writer.toString();
        retval = "";
        } catch (IOException e) {

            e.printStackTrace();
        }

        return new ModelAndView("profile", "response", st);
    }
}

谢谢

我已经尝试过你的代码，当你从异常处理程序中读取时，我发现了一些错误InputStream:

Writer writer = new StringWriter();
byte[] buffer = new byte[1024];

//Reader reader2 = new BufferedReader(new InputStreamReader(request.getInputStream()));
InputStream reader = request.getInputStream();
int n;
while ((n = reader.read(buffer)) != -1) {
    writer.toString();

}
String retval = writer.toString();
retval = "";

我已将您的代码替换为以下代码：

BufferedReader reader = new BufferedReader(new   InputStreamReader(request.getInputStream()));
String line = "";
StringBuilder stringBuilder = new StringBuilder();
while ( (line=reader.readLine()) != null ) {
    stringBuilder.append(line).append("\n");
}

String retval = stringBuilder.toString();

然后我就可以读取InputStream在异常处理程序中，它有效！ 如果您仍然无法阅读InputStream，我建议您检查如何将 xml 数据 POST 到请求正文。 您应该考虑到您可以食用Inputstream每个请求只能调用一次，因此我建议您检查是否有其他调用getInputStream()。如果你必须调用它两次或更多次，你应该编写一个自定义的HttpServletRequestWrapper像这样复制请求正文，以便您可以多次阅读。

UPDATE
您的评论帮助我重现了该问题。你使用了注解@RequestBody，所以确实没有调用getInputStream()，但 Spring 调用它来检索请求的正文。看看班级org.springframework.web.bind.annotation.support.HandlerMethodInvoker: 如果你使用@RequestBody这个类调用resolveRequestBody方法等等……最后你就看不下去了InputStream从你的ServletRequest。如果您仍想同时使用两者@RequestBody and getInputStream()在您自己的方法中，您必须将请求包装到自定义HttpServletRequestWrapper复制请求正文，以便您可以多次手动读取它。 这是我的包装：

public class CustomHttpServletRequestWrapper extends HttpServletRequestWrapper {

    private static final Logger logger = Logger.getLogger(CustomHttpServletRequestWrapper.class);
    private final String body;

    public CustomHttpServletRequestWrapper(HttpServletRequest request) {
        super(request);

        StringBuilder stringBuilder = new StringBuilder();
        BufferedReader bufferedReader = null;

        try {
            InputStream inputStream = request.getInputStream();
            if (inputStream != null) {
                bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                String line = "";
                while ((line = bufferedReader.readLine()) != null) {
                    stringBuilder.append(line).append("\n");
                }
            } else {
                stringBuilder.append("");
            }
        } catch (IOException ex) {
            logger.error("Error reading the request body...");
        } finally {
            if (bufferedReader != null) {
                try {
                    bufferedReader.close();
                } catch (IOException ex) {
                    logger.error("Error closing bufferedReader...");
                }
            }
        }

        body = stringBuilder.toString();
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        final StringReader reader = new StringReader(body);
        ServletInputStream inputStream = new ServletInputStream() {
            public int read() throws IOException {
                return reader.read();
            }
        };
        return inputStream;
    }
}

那么你应该写一个简单的Filter包装请求：

public class MyFilter implements Filter {

    public void init(FilterConfig fc) throws ServletException {

    }

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        chain.doFilter(new CustomHttpServletRequestWrapper((HttpServletRequest)request), response);

    }

    public void destroy() {

    }

}

最后，您必须在 web.xml 中配置过滤器：

<filter>     
    <filter-name>MyFilter</filter-name>   
    <filter-class>test.MyFilter</filter-class>  
</filter> 
<filter-mapping>   
    <filter-name>MyFilter</filter-name>   
    <url-pattern>/*</url-pattern>   
</filter-mapping>

您只能为真正需要它的控制器触发过滤器，因此您应该根据您的需要更改 url-pattern。

如果您仅在一个控制器中需要此功能，则还可以在通过以下方式收到请求正文时在该控制器中复制请求正文：@RequestBody注解。