SpringMVC 做請求參數的類型轉換

一.簡單轉換-Spring自帶的轉換Editor

以接收Date類型爲例:

        @RequestMapping("/testFunc")
public String testFunc(String name,Date now){
System.out.println(name);
System.out.println(now);
return "welcome";
}

@InitBinder   //參數綁定註解
public void convert(WebDataBinder dataBinder){    //這裏以Date類型爲例,convert是自定義方法,此方法可封裝於父類控制器中
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");//自定義格式
dataBinder.registerCustomEditor(Date.class, new CustomDateEditor(sdf, false));

}

二.複雜轉換-自定義轉換,自己編寫Editor

   (這裏實現將接收到的參數拼接+"轉換了"的功能,以String類型爲例)

 1.自定義Editor類

    public class MyEditor extends PropertyEditorSupport { //繼承PropertyEditorSupport 

@Override
public String getAsText() {
return getValue().toString();
}

@Override
public void setAsText(String text) throws IllegalArgumentException {//String類型
setValue(text+"轉換了");

}

}

2.註冊

        @InitBinder
public void convert(WebDataBinder dataBinder){
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
dataBinder.registerCustomEditor(Date.class, new CustomDateEditor(sdf, false));
dataBinder.registerCustomEditor(String.class, new MyEditor());
}