如何在Scala-Play应用中从URL中提取路由变量的值? [英] How do I extract the value of a route variable from the URL in a Scala-Play app?

问题描述

我正在为Play框架编写一个模块.在模块的一部分中，我具有以下代码

I am writing a module for the Play Framework. In part of my module I have the following code

abstract class SecurityFiltering extends GlobalSettings{
  override def onRequestReceived(request: RequestHeader) = {
    play.Logger.debug("onRequestReceived: " + request)
    super.onRequestReceived(request)
  }

  override def doFilter(next: RequestHeader => Handler): (RequestHeader => Handler) = {
    request => {
      play.Logger.debug("doFilter: " + request)
      super.doFilter(next)(request)
    }
  }

  override def onRouteRequest(request: RequestHeader): Option[Handler] = {
    play.Logger.debug("onRouteRequest: " + request)
    super.onRouteRequest(request)
  }
}

在doFilter方法中，我可以确定以下有用的信息

In the doFilter method I am able to determine the following useful information

ROUTE_PATTERN = /x/$name<[^/]+>/$age<[^/]+>
ROUTE_CONTROLLER = controllers.Application
ROUTE_ACTION_METHOD = tester
ROUTE_VERB = GET
path = /x/hello

除此以外，我还需要在QueryString之前 的URL命名部分的值.因此，考虑到我的测试应用程序中的以下路线，我需要检索Name = Pete和Age = 41

What I need in addition to this is the values for the named parts of the URL before the QueryString. So given the following route in my test application I need to retrieve Name=Pete and Age=41

localhost:9000/x/Pete/41

肯定在Play框架中已经有一些代码可以执行此操作，但是我找不到它.有人可以建议我如何实现这一目标，或者指出我是哪个Play类提取这些值的吗?

There is surely some code in the Play Framework which already does this but I am unable to find it. Can someone suggest how I achieve this goal, or point me at which Play class extracts these values?

推荐答案

包models.com.encentral.tattara.web.util;

package models.com.encentral.tattara.web.util;

 import java.util.HashMap;
 import java.util.Map;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;


 public class RouteExtractor {

//something like "/foo/$id<[^/]+>/edit/$james<[^/]+>"
private String routePattern;
private String path;

//something like /$id<[^/]+>
private static final String INDEX_PATTERN = "\\$(.+?)\\<\\[\\^\\/\\]\\+\\>";

public RouteExtractor(String routePattern, String path) {

    this.routePattern = routePattern;
    this.path = path;
}

private Map<Integer, String> extractPositions() {
    Pattern pattern = Pattern.compile(INDEX_PATTERN);
    Matcher matcher = pattern.matcher(this.routePattern);
    Map<Integer, String> results = new HashMap<>();
    int index = 0;
    while (matcher.find()) {
        results.put(index++, matcher.group(1));
    }
    return results;
}

private String replaceRoutePatternWithGroup() {
    Pattern pattern = Pattern.compile(INDEX_PATTERN);
    Matcher matcher = pattern.matcher(this.routePattern);
    return matcher.replaceAll("([^/]+)");
}

public Map<String, String> extract() {
    Pattern pattern = Pattern.compile(this.replaceRoutePatternWithGroup());
    Matcher matcher = pattern.matcher(this.path);
    final Map<String, String> results = new HashMap<>();
    if (matcher.find()) {
        this.extractPositions().entrySet().stream().forEach(s -> {
            results.put(s.getValue(), matcher.group(s.getKey() + 1));
        });
    }
    return results;
}

}

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