struts hello world (html:error/)

最新推荐文章于 2024-09-01 13:52:27 发布

最新推荐文章于 2024-09-01 13:52:27 发布 · 124 阅读

文章标签：

#HTML #Struts #Apache #Bean #Servlet

本文介绍了一个使用Struts框架的示例应用，包括web.xml配置、Struts-config.xml配置文件详解，以及BookAction和BookForm的具体实现过程。通过示例展示了表单验证、错误消息展示等功能。

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web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.5" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee   http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
    <init-param>
      <param-name>config</param-name>
      <param-value>/WEB-INF/struts-config.xml</param-value>
    </init-param>
    <init-param>
      <param-name>debug</param-name>
      <param-value>3</param-value>
    </init-param>
    <init-param>
      <param-name>detail</param-name>
      <param-value>3</param-value>
    </init-param>
    <load-on-startup>0</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>action</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

Struts-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd">

<struts-config>
	<data-sources />
	<form-beans>
    <form-bean name="bookForm" type="example.form.BookForm" />

	</form-beans>

	<global-exceptions />
	<global-forwards />
	<action-mappings>
    <action
      attribute="bookForm"
      input="/book/book.jsp"
      name="bookForm"
      path="/book"
      scope="request"
      type="example.action.BookAction" >
      <forward name="success" path="/book/success.jsp" />
      <forward name="home" path="/book/book.jsp" />
    </action>




	</action-mappings>

	<message-resources parameter="book.ApplicationResources" />
</struts-config>

book/books.jsp

<%@ page language="java" pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean"%>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html"%>

<html>
	<head>
		<title>JSP for BookForm form</title>
	</head>
	<body>
		<html:errors header="errors.header" footer="errors.footer"
			prefix="errors.prefix" suffix="errors.suffix" />
		<html:form action="/book">
			id : <html:text property="id" />
			<html:errors property="id" />
			<br />
			name : <html:text property="name" />
			<html:errors property="name" />
			<br />
			pwd : <html:password property="pwd" />
			<html:errors property="pwd" />
			<br />
			pwd2 : <html:password property="pwd2" />
			<html:errors property="pwd2" />
			<br />
			<html:submit />
			<html:cancel />
		</html:form>
	</body>
</html>

book/success.jsp

<%@ page language="java" pageEncoding="ISO-8859-1"%>

<%@ 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-tiles" prefix="tiles" %>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html:html lang="true">
  <head>
    <html:base />
    
    <title>success.jsp</title>

	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
    <bean:write name="book" property="id" scope="request"/>
    <bean:write name="book" property="name" scope="request"/>
    <bean:write name="book" property="pwd" scope="request"/>
    <bean:write name="book" property="pwd2" scope="request"/>
  </body>
</html:html>

book/ApplicationResources.properties

bookForm.id.required=id is required
bookForm.name.required=name is required
bookForm.pwd.required=pwd is required
bookForm.pwd2.required=pwd2 is required
errors.header=
errors.footer=
errors.prefix=<font color="red">*
errors.suffix=</font>

book/Utils.java

package book;

public class Utils {
	public static boolean isEmpty(String msg) {
		if (msg == null || msg.equals("")) {
			return true;
		} else {
			return false;
		}
	}
}

example.action.BookAction.java

/*
 * Generated by MyEclipse Struts
 * Template path: templates/java/JavaClass.vtl
 */
package example.action;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessages;

import example.form.BookForm;

/**
 * MyEclipse Struts Creation date: 10-07-2008
 * 
 * XDoclet definition:
 * 
 * @struts.action path="/book" name="bookForm" input="/book/book.jsp"
 *                scope="request" validate="true"
 */
public class BookAction extends Action {
	/*
	 * Generated Methods
	 */

	/**
	 * Method execute
	 * 
	 * @param mapping
	 * @param form
	 * @param request
	 * @param response
	 * @return ActionForward
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		BookForm bookForm = (BookForm) form;
		ActionMessages errors = bookForm.validate(mapping, request);
		if (!errors.isEmpty()) {
			saveMessages(request, errors);
			return mapping.findForward("home");
		}
		request.setAttribute("book", bookForm);
		return mapping.findForward("success");
	}
}

example.form.BookForm.java

package example.form;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;

import book.Utils;

public class BookForm extends ActionForm {

	private static final long serialVersionUID = 1L;

	private String id;
	private String name;
	private String pwd;
	private String pwd2;

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getPwd() {
		return pwd;
	}

	public void setPwd(String pwd) {
		this.pwd = pwd;
	}

	public String getPwd2() {
		return pwd2;
	}

	public void setPwd2(String pwd2) {
		this.pwd2 = pwd2;
	}

	@Override
	public void reset(ActionMapping mapping, HttpServletRequest request) {
		this.id = null;
		this.name = null;
		this.pwd = null;
		this.pwd2 = null;
	}

	@Override
	public ActionErrors validate(ActionMapping mapping,
			HttpServletRequest request) {
		ActionErrors errors = new ActionErrors();
		if (Utils.isEmpty(this.id)) {
			errors.add("id", new ActionMessage("bookForm.id.required"));
		}
		if (Utils.isEmpty(this.name)) {
			errors.add("name", new ActionMessage("bookForm.name.required"));
		}
		if (Utils.isEmpty(this.pwd)) {
			errors.add("pwd", new ActionMessage("bookForm.pwd.required"));
		}
		if (Utils.isEmpty(this.pwd2)) {
			errors.add("pwd2", new ActionMessage("bookForm.pwd2.required"));
		}
		return errors;
	}

}

html:errors注意点：

1.<html:errors/>

2.saveErrors()

3.资源文件