struts1.2一些知识

struts1.2包括相关文件：

struts-config.xml 接收action通过mapping传过来的forward，并通过对应的forward转向不同的页面

Action 处理程序 action可以继承Action，也可以继承DispatchAction

FormBean 用于把封装form表单中的数据

struts1.2工作流程

1，含输入页面，也就是form表单

首先访问form表单页，把form表单页提交到相应的action里，然后在action里通过对应FormBean把form强制转换然后用FormBean接收，

然后把formbean传到相应方法里，然后通过return mapping.findForward("");转到struts-config.xml里对应的forward，然后转向页面，

例如：

1，struts-config.xml文件如下：

<?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="wordsForm" type="com.company.form.WordsForm" />
  </form-beans>

  <global-exceptions />
  <global-forwards />
  <action-mappings >
     <action
      attribute="wordsForm"
      name="wordsForm"
      path="/words"
      scope="request"
      parameter="method"
      type="com.company.action.WordsAction">
      <forward name="words" path="/form.jsp" />
    </action>

  </action-mappings>
  <message-resources parameter="com.company.struts.ApplicationResources" />
</struts-config>

在struts-config.xml文件里一个action对应一个formBean

2，WordsForm.java文件如下：

package com.company.form;

import java.util.Date;

import org.apache.struts.action.ActionForm;

public class WordsForm extends ActionForm  {

	private static final long serialVersionUID = -686042683660710968L;
	private Integer id;
	private String name;
	private String content;
	private Date postTime;
	private String email;
	
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getContent() {
		return content;
	}
	public void setContent(String content) {
		this.content = content;
	}
	public Date getPostTime() {
		return postTime;
	}
	public void setPostTime(Date postTime) {
		this.postTime = postTime;
	}
	
}

3,WordsDao.java接口类

public interface WordsDao {	
	public void insertSave(WordsForm wordsForm);  //更新和插入	
}

4，WordsDaoImp.java对应的方法

public class WordsDaoImp extends DB implements WordsDao {

@Override

public void insertSave(WordsForm wordsForm) {
		String sql = "";
		if (wordsForm.getId() != null) {
			sql = "update words set name=?,content=?,postTime=?,email=? where id=?";
			this.update(
					sql,
					new Object[] { wordsForm.getName(),
							wordsForm.getContent(), new Date(),
							wordsForm.getId(),wordsForm.getEmail()});
		} else {
			sql = "insert into words(name,content,id,postTime,email) values(?,?,?,?,?)";
			this.insert(sql,
					new Object[] { wordsForm.getName(),
							wordsForm.getContent(), wordsForm.getId(),
							new Date(),wordsForm.getEmail() });
		}
	}

5，WordsAction.java类

package com.company.action;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;

import com.company.dao.WordsDao;
import com.company.dao.imp.WordsDaoImp;;
import com.company.form.WordsForm;

public class WordsAction extends DispatchAction {
	WordsDao wordsDao = new WordsDaoImp();	
	//添加留言
	public ActionForward insertWord(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		request.setCharacterEncoding("utf-8");
		WordsForm wordsForm = (WordsForm)form;  //用WordsForm强制转换form表单
		wordsDao.insertSave(wordsForm);    //把wordsForm添加到对应方法里
		return mapping.findForward("words");  //转向对应mapping中的forward
	}
}

6，输入页，form表单页 form.jsp文件如下：

	<form action="words.do?method=insertWord" id="form" method="post">
	<table width="398">
	  <tr>																				<td height="25" align="left" valign="top">
     <input name="name" id="name" type="text" value="您的称呼:" onBlur="if (value ==''){value='您的称呼:'}">
		</td>
	  </tr>																			  <tr>																			        <td height="25" align="left" valign="top">
     <input name="email" id="email" type="text"onfocus="if (value =='您的邮箱:'){value =''}" onBlur="if (value ==''){value='您的邮箱:'}">
	        </td>
	  </tr>				
          <tr>
		<td>
 <textarea name="content" id="content" overflow:auto" onfocus="if (value =='请输入内容:'){value =''}" onBlur="if (value ==''){value='请输入内容:'}"></textarea></td> </tr></table></form>

然后访问form表单页就可以运行了
2，不含form表单页的流程：
其实大致都是一样的，只不过直接要访问action地址，然后直接处理，比如你要输出内容直接在action里处理，然后用request.setAttribute("name",调用方法);把name传到页面上，然后在相应的页面上用bean标签或者logic标签直接输出就可以了
如果需要把id传值到相应页面上然后访问，那么就要通过超链接里把id传过去
例如：<a href="dongtai.do?method=dongtai&id=<bean:write name="dongtai" property="id" />"><bean:write name="dongtai" property="title" /> </a>
就可以把id传到相应的页面上，然后在action里用String id= request.getParameter("id");接收，然后把id传到相应的方法里，然后就可以了！