SpringMVC请求参数转换
我可以使用 SpringMVC 中的属性编辑器对请求参数进行自定义转换。例如，要将请求参数转换为下面的 Foo 实例，
public class Foo {
private val;
public Foo(String val) {
this.val = val;
}
public getVal() {
return val;
}
}
我可以定义一个属性编辑器
public class FooPropertyEditor extends PropertyEditorSupport {
void setAsText(String paramValue) {
value = new Foo(paramValue);
}
public String getAsText() {
return ((Foo) value).getVal();
}
}
并注册它以执行从 String 到 Foo 的转换
public class CustomEditorRegistrar implements PropertyEditorRegistrar {
public void registerCustomEditors(PropertyEditorRegistry reg) {
reg.registerCustomEditor(Foo.class, new FooPropertyEditor());
}
}
是否可以使用属性编辑器来转换 multi -值参数，例如
foo=foo1&foo=foo2&foo=foo3
List。假设我已经编写了一个适当的属性编辑器 FooListPropertyEditor，我认为我无法使用以下方法注册它：
public void registerCustomEditors(PropertyEditorRegistry reg) {
reg.registerCustomEditor(List<Foo>.class, new FooListPropertyEditor());
}
因为 AFAIK List 不是有效的语法
I can use property editors in SpringMVC to do custom conversion of a request parameter. For example to convert a request parameter to an instance of Foo below
public class Foo {
private val;
public Foo(String val) {
this.val = val;
}
public getVal() {
return val;
}
}
I can define a property editor
public class FooPropertyEditor extends PropertyEditorSupport {
void setAsText(String paramValue) {
value = new Foo(paramValue);
}
public String getAsText() {
return ((Foo) value).getVal();
}
}
and register this to perform conversion from a String to a Foo
public class CustomEditorRegistrar implements PropertyEditorRegistrar {
public void registerCustomEditors(PropertyEditorRegistry reg) {
reg.registerCustomEditor(Foo.class, new FooPropertyEditor());
}
}
Is it possible to use a property editor to convert a multi-valued parameter such as
foo=foo1&foo=foo2&foo=foo3
to a List<Foo>. Assuming I've already written an appropriate property editor FooListPropertyEditor, I don't think I can register it using:
public void registerCustomEditors(PropertyEditorRegistry reg) {
reg.registerCustomEditor(List<Foo>.class, new FooListPropertyEditor());
}
Because AFAIK List<Foo>.class is not valid syntax
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看看org.springframework.beans.propertyeditors.CustomCollectionEditor
take a look at org.springframework.beans.propertyeditors.CustomCollectionEditor