自定义标签-自定义注解

标签：

首先是4个自定义注解类
StaticResourceType.java

public enum StaticResourceType {
    LESS,CSS,JS
}

StaticResource.java

@Target({ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface StaticResource {
    StaticResourceType type();
    String path();
    DependencyResource[] dependencies() default {};
}

StaticResources.java

@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface StaticResources {
    StaticResource[] value();
}

DependencyResource.java

@Target({ElementType.PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
public @interface DependencyResource {
    StaticResourceType type();
    String path();
}

所有标签的父类

BaseProperty.java

public class BaseProperty extends TagSupport{

    // 按钮的id
    protected String id;
    // 按钮的name
    protected String name;
    // 按钮的class
    protected String htmlClass;
    // 按钮的样式
    protected String style;
    // 按钮上面的名字
    protected String href;
    protected String type;
    // 按钮不可用
    protected String disabled;
    // 传进来的参数，是link就传url进来。是action 就传action进来。
    protected String parames;
    // 按钮上面的名字
    protected String value;
    // 打开页面的类型
    protected String target;
    // 类型非为三种 link submit button reset
    protected String btntype;




    // 事件
    protected String onclick;
    protected String ondblclick;
    protected String onmouseover;
    protected String onmouseout;
    protected String onmousedown;
    protected String onmouseup;
    protected String onmousemove;
    protected String onkeydown;
    protected String onkeyup;
    protected String onkeypress;
    protected String onfocus;
    protected String onblur;
    protected String onchange;
    protected String onselect;


    @Override
    public void setPageContext(PageContext pageContext) {
        this.pageContext = pageContext;
        List<Class<?>> classes=(List<Class<?>>)pageContext.getAttribute("allTag");
        if(classes==null){
            classes = new ArrayList<Class<?>>();
        }
        classes.add(this.getClass());
        pageContext.setAttribute("allTag", classes);
    }
}
自定义的button标签

ButtonTag.java

@StaticResources(
        {
                @StaticResource(path = "resources/css/index3.less", type = StaticResourceType.LESS, dependencies = {
                        @DependencyResource(path="resources/css/7.js",type = StaticResourceType.JS),
                        @DependencyResource(path="resources/css/8.js",type = StaticResourceType.JS),
                        @DependencyResource(path="resources/css/9.js",type = StaticResourceType.CSS)
                }),@StaticResource(path = "resources/css/index4.less", type = StaticResourceType.LESS, dependencies = {
                @DependencyResource(path="resources/css/10.js",type = StaticResourceType.JS),
                @DependencyResource(path="resources/css/11.js",type = StaticResourceType.JS),
                @DependencyResource(path="resources/css/12.js",type = StaticResourceType.CSS)
        })
        }
)
public class ButtonTag extends BaseProperty {

    @Override  
    public int doStartTag() throws JspException {

        StringBuilder builder = new StringBuilder();  
        builder.append("<input ");
        if ((btntype != null) && (btntype.equals("submit"))) {
            builder.append("type=‘submit‘ ");
        } else if ((btntype != null) && (btntype.equals("button"))) {
            builder.append("type=‘button‘  ");
        } else if ((btntype != null) && (btntype.equals("reset"))) {
            builder.append("type=‘reset‘ ");
        } else {
            if (StringUtil.isEmpty(target)) {
                target = "_self";
            }
            builder.append("type=‘button‘ onclick=\"javascript:window.open(\‘" + parames + "\‘,\‘" + target + "\‘);\"");
        }
        builder.append("value =‘" + value + "‘ ");
        if (!StringUtil.isEmpty(id)) {
            builder.append("id=‘" + id + "‘  ");
        }
        if (!StringUtil.isEmpty(name)) {
            builder.append("name=‘" + name + "‘  ");
        }
        if (!StringUtil.isEmpty(disabled)) {
            if (!disabled.equals("false")) {
                builder.append("disabled=‘" + disabled + "‘  ");
            }
        }
        if (!StringUtil.isEmpty(onclick)) {
            builder.append("onclick=‘" + onclick + "‘  ");
        }

        if (!StringUtil.isEmpty(style)) {
            builder.append("style =‘" + style + "‘ ");
        }else{
            if (!StringUtil.isEmpty(htmlClass)) {
                builder.append("class=‘" + htmlClass + "‘ ");
            } else {
                builder.append("class =‘selectBtn‘");
            }
        }

        builder.append(" />");  
  
        try {  
            pageContext.getOut().write(builder.toString());  
        } catch (Throwable cause) {  
            throw new RuntimeException("自定义按钮标签出错", cause);  
        }  
        return SKIP_BODY;  
    }


}

ResourceTag标签用于结束，并输入依赖的js或者css

public class ResourceTag extends TagSupport{
   @Override
   public int doStartTag() throws JspException {
      try {
         ServletRequest request=pageContext.getRequest();
         String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+"/";
         List<Class<?>> classes = (List<Class<?>>) pageContext.getAttribute("allTag");
         JspWriter out = this.pageContext.getOut();
         LinkedList<String> pathListLink=new LinkedList<>();
         for (Class<?> clazz : classes) {
            StaticResources annotation = clazz.getAnnotation(StaticResources.class);
            StaticResource[] staticResourceArry=annotation.value();
            for(StaticResource staticResource:staticResourceArry){
               String path=staticResource.path();
               StaticResourceType staticResourceType=staticResource.type();
               DependencyResource[] dependencyResourcesArry=staticResource.dependencies();
               for(DependencyResource dependencyResource :dependencyResourcesArry){
                  StaticResourceType depType=dependencyResource.type();
                  String depPath=dependencyResource.path();
                  addStyle(depType,pathListLink,depPath,basePath);

               }
               addStyleLast(staticResourceType,pathListLink,path,basePath);
            }

         }
         if (null != pathListLink && pathListLink.size() > 0) {
            StringBuffer buffer = new StringBuffer();
            /*for(Map.Entry<String, String> entry : treeMap.entrySet()) {
               System.out.println(entry.getKey());
               buffer.append(entry.getValue());
            }*/
            for(String str:pathListLink){
               buffer.append(str);
            }
            out.println(buffer.toString());

         }
      } catch (Exception e) {
         e.printStackTrace();
      }
      return SKIP_BODY;
   }

   public void addStyle(StaticResourceType type,LinkedList<String> pathListLink,String path,String basePath){
      boolean isContains=false;
      for(String str:pathListLink){
         if (str.contains(path)){
            isContains=true;
         }
      }

      String currentPath2=getClass().getResource("/").getFile().toString();
      if (!isContains) {
         if (type == StaticResourceType.LESS) {
            String lable = "<link rel=‘stylesheet‘ href=‘" +basePath+ path + "‘ type=‘text/css‘ />";
            pathListLink.add(lable);
         }
         if (type == StaticResourceType.JS) {
            String lable = "<script type=‘text/javascript‘ src=‘" +basePath+ path + "‘></script>";
            pathListLink.add(lable);
         }
         if (type == StaticResourceType.CSS) {
            String lable = "<link rel=‘stylesheet‘ href=‘" +basePath+ path + "‘ type=‘text/css‘ />";
            pathListLink.add(lable);
         }
      }
   }


   public void addStyleLast(StaticResourceType type,LinkedList<String> pathListLink,String path,String basePath){
      boolean isContains=false;
      for(String str:pathListLink){
         if (str.contains(path)){
            isContains=true;
         }
      }

      if (!isContains) {
         if (type == StaticResourceType.LESS) {
            String lable = "<link rel=‘stylesheet‘ href=‘"+basePath+path+ "‘ type=‘text/css‘ />";
            pathListLink.addLast(lable);
         }
         if (type == StaticResourceType.JS) {
            String lable = "<script type=‘text/javascript‘ src=‘"+basePath+ path+ "‘></script>";
            pathListLink.addLast(lable);
         }
         if (type == StaticResourceType.CSS) {
            String lable = "<link rel=‘stylesheet‘ href=‘"+basePath+path+ "‘ type=‘text/css‘ />";
            pathListLink.addLast(lable);
         }
      }

   }



}

声明tld文件（WEB-INF目录下）

<?xml version="1.0" encoding="UTF-8"?>

<taglib xmlns="http://java.sun.com/xml/ns/javaee"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd"
        version="2.1">
    <description>
        标签库信息描述
    </description>
    <tlib-version>1.0</tlib-version>
    <short-name>axx</short-name><!-- 指定标签库默认的前缀名 -->
    <uri>/mytaglib</uri><!-- 定标签库唯一访问表示符 -->

    <!--Resource-->
    <tag>
        <!--指定标签名-->
        <name>resource</name>
        <!--指定标签类文件的全路径-->
        <tag-class>com.aixuexi.tag.model.ResourceTag</tag-class>
        <body-content>empty</body-content><!-- 定标签间的主体(body)内容形式 -->
    </tag>
    <!--button标签-->
    <tag>
        <name>button</name>
        <tag-class>com.aixuexi.tag.model.ButtonTag</tag-class>
        <body-content>JSP</body-content>
        <attribute>
            <name>id</name>
            <rtexprvalue>true</rtexprvalue>
        </attribute>
        <attribute>
            <name>name</name>
            <rtexprvalue>true</rtexprvalue>
        </attribute>
        <attribute>
            <name>btntype</name>
            <required>true</required>
            <rtexprvalue>true</rtexprvalue>
        </attribute>
        <attribute>
            <name>parames</name>
            <rtexprvalue>true</rtexprvalue>
        </attribute>
        <attribute>
            <name>htmlClass</name>
            <rtexprvalue>true</rtexprvalue>
        </attribute>
        <attribute>
            <name>disabled</name>
            <rtexprvalue>true</rtexprvalue>
        </attribute>
        <attribute>
            <name>style</name>
            <rtexprvalue>true</rtexprvalue>
        </attribute>
        <attribute>
            <name>value</name>
            <required>true</required>
            <rtexprvalue>true</rtexprvalue>
        </attribute>
        <attribute>
            <name>target</name>
            <rtexprvalue>true</rtexprvalue>
        </attribute>
        <attribute>
            <name>onclick</name>
            <rtexprvalue>true</rtexprvalue>
        </attribute>
    </tag>

</taglib>
web.xml中配置tld

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
   xmlns="http://java.sun.com/xml/ns/javaee" 
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
   xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
   http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    <welcome-file-list>
        <welcome-file>/index.jsp</welcome-file>
    </welcome-file-list>
  <jsp-config>
    <taglib>
        <taglib-uri>mytaglib</taglib-uri>
        <taglib-location>/WEB-INF/aixuexi.tld</taglib-location>
    </taglib>
  </jsp-config>
  
</web-app>

JSP中页面引用自定义标签

1.<%@ taglib uri="/mytaglib" prefix="axx"%>

2.<axx:button btntype="" value="我是自定义button" disabled="" htmlClass="asdfasdf" ></axx:button>
3.<axx:resource />

自定义标签-自定义注解

标签：

原文地址：http://www.cnblogs.com/jimmy-muyuan/p/5608730.html