如何在 playframework 中自动修剪请求参数 [英] How to trim request parameters automatically in playframework

问题描述

Play 会将请求参数分配给动作参数，例如:

Play will assign the parameters from request to action parameters, like:

public static void createArticle(String title, String content) {
}

但它不会修剪它们，所以我们通常在动作中使用这样的代码:

But it won't trim them, so we usually to such code in the actions:

public static void createArticle(String title, String content) {
    if(title!=null) title = title.trim();
    if(content!=null) content = content.trim();
}

有没有办法让播放自动修剪它们?

Is there any way to let play trim them automatically?

推荐答案

有多种方法可以使用自定义绑定器实现此目的.一种方法是这样的:

There are multiple ways to achive this with custom binders. One way of doing would be this:

• 在修剪字符串的某处定义一个自定义的活页夹

• 使用 @As(binder=TrimmedString.class)

public class Application extends Controller {

    public static class TrimmedString implements TypeBinder<String> {
        @Override
        public Object bind(String name, Annotation[] annotations, String value, Class actualClass, Type genericType) throws Exception {
            if(value != null) {
                value = value.trim();
            }
            return value;
        }
    }

    public static void index(
            @As(binder=TrimmedString.class) String s1,
            @As(binder=TrimmedString.class) String s2,
            @As(binder=TrimmedString.class) String s3) {
        render(s1, s2, s3);
    }
}

如果这对你来说太冗长了，只需使用 @Global 绑定器来检查自定义的 @Trim 或 @As('trimmed') 注释.TypeBinder 已经有所有可用的注释，所以这应该很容易实现.

If this is too verbose for you, simply use a @Global binder for String which checks for a custom @Trim or @As('trimmed') annotation. The TypeBinder already has all annotations available so this should be very easy to implement.

所有这些都可以在自定义绑定下的文档中找到.

All this can be found in the documentation under custom binding.

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