自定义分页标签步骤

Posted 2021-01-14 yunshao

1.引架包

<!--javaee，处理自定义标签-->
    <dependency>
      <groupId>javax</groupId>
      <artifactId>javaee-api</artifactId>
      <version>7.0</version>
      <scope>provided</scope>
    </dependency>

2.在WEB-INF中创建.tld.文件，加入需引用的属性

<?xml version="1.0" encoding="UTF-8" ?>
<taglib>
    <tlib-version>1.1</tlib-version>
    <jsp-version>2.0</jsp-version>
    <short-name>fy</short-name>
    <uri>http://java.sun.com/jsp/fenye/fy</uri>

    <tag>
        <name>fy</name>
        <tag-class>com.ly.util.FeiyeUtil</tag-class>
        <body-content>empty</body-content>//标签之间的内容为空
        <attribute>
            <name>url</name>
            <required>true</required>//必须的
            <type>java.lang.String</type>//类型
            <rtexprvalue>true</rtexprvalue>//支持EL表达式
        </attribute>
        <attribute>
            <name>pageinfo</name>
            <type>com.github.pagehelper.PageInfo</type>
            <rtexprvalue>true</rtexprvalue>
        </attribute>
    </tag>
</taglib>

3.创建工具处理类extends SimpleTagSupport

public class FenyeUtil extends SimpleTagSupport {

    private String url;//请求地址
    private PageInfo pageInfo;//保存分页所需的数据

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public PageInfo getPageInfo() {
        return pageInfo;
    }

    public void setPageInfo(PageInfo pageInfo) {
        this.pageInfo = pageInfo;
    }

    @Override
    public void doTag() throws JspException, IOException {
        JspWriter out=this.getJspContext().getOut();
        StringBuffer stringBuffer=new StringBuffer();
        stringBuffer.append("<a href=‘"+url+"&index=1&size="+pageInfo.getPageSize()+"‘>首页</a>");
        stringBuffer.append("<a href=‘"+url+"&index="+(pageInfo.getPrePage()==0?1:pageInfo.getPrePage())+"&size="+pageInfo.getPageSize()+"‘>上一页</a>");
        stringBuffer.append("<a href=‘"+url+"&index="+(pageInfo.getNextPage()==0?pageInfo.getPages():pageInfo.getNextPage())+"&size="+pageInfo.getPageSize()+"‘>下一页</a>");
        stringBuffer.append("<a href=‘"+url+"&index="+pageInfo.getPages()+"&size="+pageInfo.getPageSize()+"‘>尾页</a>");
        stringBuffer.append("共"+pageInfo.getTotal()+"条");

        out.print(stringBuffer.toString());



    }
}