java 枚举 下拉框_枚举enum在velocity模板语言中的应用-下拉菜单

1. velocity模板vm页面

#if("add" == $flag)

#foreach($elem in $languageEnum)

$elem.name

#end

#else

#foreach($elem in $languageEnum)

#set($temp=0);

#foreach($arr in $languageArray)

#if($arr == $elem.id)

#set($temp=1);break;

#end

#end

#if($temp==1)

$elem.name

#else

$elem.name

#end

#end

#end

2. controller中Java代码

//增加页面代码处理

@RequestMapping("toAdd")

public String toAdd(Model model) {

model.addAttribute("flag", "add");

model.addAttribute("languageEnum",LanguageEnum.values());

return "apps/appsAdd";

}

//去修改页面代码处理

String languages = appsDetail.getLanguages();

String[] languageArray = {} ;

if(!"".equals(languages)){

languages = languages.substring(0, languages.length() - 1);

languageArray = languages.split(",");

}

model.addAttribute("languageArray", languageArray);

3. 枚举enum实例

package com.wxsk.app.constant;

public enum LanguageEnum {

CHINESE(1, "中文"),

ENGLISH(2, "英文");

// 成员变量

private Integer id;

private String name;

LanguageEnum(Integer id, String name) {

this.id = id;

this.name = name;

}

public Integer getId() {

return this.id;

}

public String getName() {

return this.name;

}

public static LanguageEnum get(int id) {

LanguageEnum[] elements = LanguageEnum.values();

for (int i = 0; i < elements.length; i++) {

if (elements[i].getId() == id) {

return elements[i];

}

}

return null;

}

public static void main(String[] args) {

System.out.println(LanguageEnum.get(1));

}

}

4. 枚举转化为集合

@RequestMapping("queryLanguageList")

public @ResponseBody String queryLanguageList(HttpServletRequest request){

LanguageEnum[] languageEnum = LanguageEnum.values() ;

List languageList = new ArrayList() ;

for(int i=0;i

Language language = new Language();

language.setId(languageEnum[i].getId());

language.setName(languageEnum[i].getName());

languageList.add(language);

}

return getJSONStr(languageList);

}