小案例：struts1.3利用nested标签使用POJO-白红宇

小案例：struts1.3利用nested标签使用POJO

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发布时间：2019-06-27

本文共 3038 字，大约阅读时间需要 10 分钟。

其中的关键就是这个POJO是你自己去new一个，struts是不会帮你创建的！参考http://luohua.iteye.com/blog/39976

表单页

<%@ page language="java" contentType="text/html; charset=GBK"    pageEncoding="GBK"%><%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %><%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %><%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %><%@ taglib uri="http://struts.apache.org/tags-nested" prefix="nested" %>
     Insert title here    
          
     
              INFO:
      
      
            
      
                       姓名：
       
       
                年龄：

ActionForm

public class UseBeanForm extends ActionForm {        private Person person = new Person(); // You must initialize this bean by yourself!!!    private String info;    public String getInfo() {        return info;    }    public Person getPerson() {        return person;    }    public void setInfo(String info) {        this.info = info;    }    public void setPerson(Person person) {        this.person = person;    }    @Override    public ActionErrors validate(ActionMapping mapping,            HttpServletRequest request) {        ActionErrors errors = new ActionErrors();        if (info == null || info.trim().length() == 0) {            errors.add("emptycontent", new ActionMessage("jwid.c14.section14dot5.emptyconent"));        }        if (person == null || person.getName().trim().length() == 0 || person.getAge() <= 0) {            errors.add("emptycontent", new ActionMessage("jwid.c14.section14dot5.emptyconent"));        }        return errors;    }}

Action

public class UseBeanAction extends Action {    @Override    public ActionForward execute(ActionMapping mapping, ActionForm form,            HttpServletRequest request, HttpServletResponse response)            throws Exception {        UseBeanForm useBeanForm = (UseBeanForm)form;        String info = useBeanForm.getInfo();        if (info.length() > 5) {            return mapping.findForward("infoMore");        } else {            return mapping.findForward("infoLess");        }    }}

结果页1 info_less.jsp

<%@ page language="java" contentType="text/html; charset=GBK"    pageEncoding="GBK"%><%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %><%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %><%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>
     Insert title here    info.length <= 5
    ${requestScope.info }
    ${requestScope.person.name }
    ${requestScope.person.age }

结果页2 info_more.jsp

<%@ page language="java" contentType="text/html; charset=GBK"    pageEncoding="GBK"%><%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %><%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %><%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>
     Insert title here    info.length > 5
    ${requestScope.info }
    ${requestScope.person.name }
    ${requestScope.person.age }

struts-config.xml