struts类型转换的一种简便方法

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开发web网站，必然要涉及到类型转换，用struts2框架来开发的话，其中有很多相关方法，核心的一个思想就是将页面中需要提交的内容封装到一个类，然后由某个action调用。根据这个思想，将其中的一个方法的代码粘贴出来：

1 先定义一个javabean 即一个用户类，就两个字段，username和password。

public class User {
   private String username;
   private String password;

   public User(){}
   public User(String username, String password) {

       this.username = username;
       this.password = password;
   }

   public String getUsername() {
       return username;
   }

   public void setUsername(String username) {
       this.username = username;
   }

   public String getPassword() {
       return password;
   }

   public void setPassword(String password) {
       this.password = password;
   }

}

2 创建一个action，处理页面表单元素

public class LoginAction extends ActionSupport {

   private User user;

   public User getUser() {
       return user;
   }
   public void setUser(User user) {
       this.user = user;
   }
   @Override
   public String execute() throws Exception {
        System.out.println(user.getUsername());
        System.out.println(user.getPassword());
       return "success";
   }

}

3创建一个两个jsp,分别是index.jsp和success.jsp

index.jsp如下

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>

<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">

    <title>My JSP 'index.jsp' starting page</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">
   
</head>

<body>
    <s:form action="Login">
    
    <s:textfield name="user.username" label="名字"></s:textfield>
    <s:password name="user.password" label="密码"></s:password>
    <s:submit value="提交"></s:submit>
     </s:form>
</body>
</html>
备注：其中user.username的user字段要和action中的user名字相同，还有这里用到struts标签，这样就会自动调用username和password的set方法，进而封装。

success.jsp 显示效果

4.最后一步配置struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
   <package name="test" extends="struts-default">
      <action name="Login" class="com.action.LoginAction">
       <result name="success">/success.jsp</result>
       <result name="input">/index.jsp</result>
      </action>
   </package>
</struts>