Spring MVC - 重定向后保留请求参数 [英] Spring MVC - keep request parameters after redirect

问题描述

我有一种情况，我的前端开发人员想要为每个链接添加几个参数。他需要那些作为链接指向的视图中的参数。

I have a situation here where my frontend developer wants to add several parameters to every link. He needs those as parameters in the view where the link points to.

每个 @Controller 方法只返回字符串。这由标准的viewresolver支持，使用所述String作为viewname：

Each @Controller method will return Strings only. This is backed by a standard viewresolver using said String as viewname:

<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"
        p:prefix="/WEB-INF/jsp/" p:suffix=".jsp" />

每当Controller返回重定向时：但是，来自原始请求的请求参数被删除，他无法在.jsp

Whenever the Controller returns a redirect: however, the request parameters from the original request are dropped and he can not access them in the .jsp

是否有任何简洁的方法来确保即使在 redirect：'ing，url参数出现在被重定向到的视图中？

Is there any neat way to ensure that even after redirect:'ing, the url parameters are present in the view which was redirected to?

推荐答案

由于Bozho建议的解决方案对我的需求不太满意，我写了一个过滤器，它完全符合我的要求。不确定在将来的情况下是否会出现任何问题，但在此之前，请随意使用我的实施：

Since the solutions suggested by Bozho where not quite satisfactory for my needs, I wrote a filter which does exactly what I want. Not sure if any problems might occur in future cases but until then, feel free to use my implementation:

/**
*
* @author Lennart Koester (University of Innsbruck, 2012)
*/
@Service
public class RedirectFilter implements Filter {

@Override
public void init(FilterConfig filterConfig) throws ServletException {
}

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

    String queryString = ((HttpServletRequest) request).getQueryString();
    if (queryString != null) {
        RedirectAwareResponseWrapper res = new RedirectAwareResponseWrapper((HttpServletResponse) response);
        chain.doFilter(request, res);
        if (res.isRedirected()) {
            ((HttpServletResponse) response).sendRedirect(res.getLocation() + "?" + queryString);
        }
    } else {
        chain.doFilter(request, response);
    }
}

@Override
public void destroy() {
}

class RedirectAwareResponseWrapper extends HttpServletResponseWrapper {

    private boolean redirected = false;
    private String location;

    public RedirectAwareResponseWrapper(HttpServletResponse response) {
        super(response);
    }

    @Override
    public void sendRedirect(String location) throws IOException {
        redirected = true;
        this.location = location;
        //IMPORTANT: don't call super() here
    }

    public boolean isRedirected() {
        return redirected;
    }

    public String getLocation() {
        return location;
    }

}
}

这篇关于Spring MVC - 重定向后保留请求参数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！