Struts2（6）：Struts2的输入校验2

Struts2类型转换与输入校验

最新推荐文章于 2022-04-24 13:50:01 发布

原创最新推荐文章于 2022-04-24 13:50:01 发布 · 95 阅读

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#JSP #Struts #SQL #框架 #XML

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遇到类型转换错误的时候（也就是说不能进行类型转换），struts2框架自动生成一条错误信息，并且将该错误信息放到addFieldError里面

类型转换与输入校验的流程

1. 首先Struts2对客户端传来的数据进行类型转换

2. 类型转换完毕后再进行输入校验

3. 如果类型转换和输入校验都没有错误发生，那么进入execute方法（调用商业逻辑）

注意：如果类型转换不成功，也同样要进行输入校验

1，新建一个register2.jsp

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%@ taglib prefix="s" uri="/struts-tags" %>

<html>
  <body>
  	<table>
  		<s:fielderror/>
  		<s:form action ="register2">
	  		<s:textfield name="username" label="username"></s:textfield>
	  		<s:password name="password" label="password"></s:password>
	  		<s:password name="repassword" label="repassword"></s:password>
	  		<s:textfield name="age" label="age"></s:textfield>
	  		<s:textfield name="birthday" label="birthday"></s:textfield>
	  		<s:textfield name="graduation" label="graduation"></s:textfield>
	  		<s:submit value="submit"></s:submit>
  		</s:form>
  	</table>
  </body>
</html>

2，struts.xml配置如下

<action name="register2" class="com.test.action.RegisterAction2">
	<result name="success">/success.jsp</result>
	<result name="input">/register2.jsp</result>	
</action>

3，RegisterAction.java，在validate方法中进行校验，注意这里是addActionError

package com.test.action;

import java.sql.Date;
import java.util.Calendar;

import com.opensymphony.xwork2.ActionSupport;

public class RegisterAction2 extends ActionSupport {
	
	private String username;
	private String password;
	private String repassword;
	private int age;
	private Date birthday;
	private Date graduation;
	
	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;
	}
	public String getRepassword() {
		return repassword;
	}
	public void setRepassword(String repassword) {
		this.repassword = repassword;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public Date getBirthday() {
		return birthday;
	}
	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}
	public Date getGraduation() {
		return graduation;
	}
	public void setGraduation(Date graduation) {
		this.graduation = graduation;
	}
	public String execute() throws Exception {
		System.out.println("execute.....");
		return SUCCESS;
	}
	public void validate() {
		System.out.println("validate .......");
		if(age < 0){
			this.addActionError( "your age is error.action error");
		}
		if(null == username || username.equals("")){
			this.addActionError("please input your username ,action error");
		}
		if(null == password || null == repassword || !password.equals(repassword)){
			this.addActionError("your password is invalid ,action error");
		}
		if(null != birthday && null != graduation){
			Calendar c1 =Calendar.getInstance();
			c1.setTime(birthday);
			Calendar c2 =Calendar.getInstance();
			c2.setTime(graduation);
			if(c1.after(c2)){
				this.addActionError("birthday should be before graduation");
			}
		}
	}
	
	
}

4，可以在action中指定方法，如

<action name="register2" class="com.test.action.RegisterAction2" method="abc">
	<result name="success">/success.jsp</result>
	<result name="input">/register2.jsp</result>	
</action>

在程序执行到RegisterAction2时，会去执行abc方法，不再去执行execute,但会继续调用validate方法进行输入校验。也可以为abc编写专用的校验方法validateAbc,注意：执行完专用的validateAbc后，struts2仍然会执行validate方法，如果想不执行，可以将validate改名为validateExecute。那么只有在执行execute时，才会执行validateExecute。