[Spring] Mapping among jsp, controller and DB

// === @ModelAttribute ===
@ReuestMapping(value=...)
public String m(
    @ModelAttribute(ATTRIBUTE_MODEL) MyObject myObject) {
    
    // 若 MyObject 前有宣告 @ModelAttribute(ATTRIBUTE_MODEL)
    // 會受 prepare() 中對 MyObject o 操作的影響
    // 若沒有宣告 則仍單純是 form bean

}

@ModelAttribute(ATTRIBUTE_MODEL)
public Object prepare() {
    // 進入 m() 前會先經過這裡
    MyObject o = new MyObject();
    return o;
}


// === URL Mapping ===
@RequestMapping(value = URL_MAPPING, method = RequestMethod.POST)
public String m(
    @RequestParam(value = ATTRIBUTE_ID, required = true) BigDecimal id) {
    // 除了 RequestMapping 中的 value 要 mapping 到以外
    // 若 RequestParam 中 required = true，request 中也必須帶有此 attribute
}


// === Mapping enum object to DB ===
// DB 內儲存的是 NAME1
// @Enumerated 便會儲存 MyObject 所對應的 name
@Enumerated (EnumType.STRING)
public MyObject getMyObject() {}

enum MyObject {
    NAME1("value1");
}


// DB 內儲存的是 DB_VALUE
// 從 DB 取出後 可藉 valueOfCode 取得相對應 MyObject
enum MyObject {
    NAME1("DB_VALUE");

    private static volatile Map<String, MyObject> registry = new HashMap<String, MyObject>();

    // Use DB_VALUE be the key of Map
    // put value to Map and use key to get MyObject
    public static MyObject valueOfCode (String code) {
        if(0 == registry.size())  {
             synchronized ( registry) {
                 if(0 == registry.size())  {
                     for(MyObject o: MyObject.values())  {
                         registry.put(o. code, o);
                     }
                 }
              }
        }
            return registry.get(code);
        }
    }

[Apache] Directory setting

httpd.conf

Alias /virtualUrl /RealUrl


    AllowOverride None
    Options None
    Order allow,deny
    Allow from all