struts2学习笔记七（第7讲.Struts2的输入校验续二）

程序员文章站 2022-05-28 15:53:17

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[b][size=xx-large]Struts2的输入校验续二[/size][/b]
[b]主要介绍[color=red]addActionError[/color]的用法：[/b]
一、修改com.test.action下的RegisterAction.java类（把addFieldError改成addActionError）：


package com.test.action;

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

import com.opensymphony.xwork2.ActionSupport;

public class RegisterAction 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;
	}

	@Override
	public String execute() throws Exception {

		return SUCCESS;
	}

	@Override
	public void validate() {

		if(null == username || username.length() < 6 || username.length() > 10){
			this.addActionError("username invalid");
		}
		if(null == password || password.length() <6 || password.length() > 10){
			this.addActionError("password invalid");
		}
		else if(null == repassword || repassword.length() < 6 || repassword.length() > 10){
			this.addActionError("repassword invalid");
		}
		else if(!password.equals(repassword)){
			this.addFieldError("password", "two passwords not the same");
		}
		if(age <= 0 || age > 150){
			this.addActionError("age should be between 1 and 150");
		}
//		if(null == birthday){
//			this.addFieldError("birthday", "birthday invalid");
//		}
//		if(null == graduation){
//			this.addFieldError("graduation", "graduation invalid");
//		}
		if(null != birthday && null != graduation){
			Calendar c1 = Calendar.getInstance();
			c1.setTime(birthday);

			Calendar c2 = Calendar.getInstance();
			c2.setTime(graduation);

			if(!c1.before(c2)){
				this.addActionError("birthday should be before graduation");
			}
		}
	}
}

[color=red]struts2标签能自动的显示错误信息，但是只局限于addFieldError级别的，当使用addActionError的时候就不能自动的显示错误的提示信息了。[/color]
二、需要在标签页面register2.jsp里面添加一个标签<s:actionerror/>：


 <body>

  	<s:actionerror cssStyle="color:red"/>

    <s:form action="register">

    	<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>

  </body>

结果如下：

[img]http://dl.iteye.com/upload/attachment/388767/80a47a11-468e-345f-a58f-42b3600e45ee.jpg[/img]

当年龄输入的为字母型的字符串时，验证如下图：

[img]http://dl.iteye.com/upload/attachment/388775/48d2a030-1f47-317d-90f3-d9f46a053b0f.jpg[/img]

会出现验证重复的现象：
三、要修改注册页面register.jsp的标签格式：


  <body>

  	<table align="center" width="40%">
		<tr>
			<td>
				<s:actionerror cssStyle="color:red"/>
			</td>
		</tr>
	</table>

    <s:form action="register" theme="simple">
    	<table align="center" width="40%" border="1">
    		<tr>
    			<td>username
    			</td>
    			<td>
    				<s:textfield name="username" label="username"></s:textfield>
    			</td>
    		</tr>
    		<tr><td>password</td>
    			<td>
    				<s:password name="password" label="password"></s:password>
    			</td>
    		</tr>	
    		<tr><td>repassword</td>
    			<td>
    				<s:password name="repassword" label="repassword"></s:password>
    			</td>
    		</tr>
    		<tr><td>age</td>
    			<td>
    				<s:textfield name="age" label="age"></s:textfield>
    			</td>
    		</tr>
    		<tr><td>birthday</td>
    			<td>
    				<s:textfield name="birthday" label="birthday"></s:textfield>
    			</td>
    		</tr>
    		<tr><td>graduation</td>
    			<td>
    				<s:textfield name="graduation" label="graduation"></s:textfield>
    			</td>
    		</tr>
    		<tr><td><s:submit value=" submit "></s:submit></td>
    			<td>
    				<s:reset value=" reset "></s:reset>
    			</td>
    		</tr>
    	</table>	
    </s:form>

  </body>

效果如下图所示：

[img]http://dl.iteye.com/upload/attachment/388790/f8bd1e06-521f-3b09-8cc8-b05954ac1650.jpg[/img]
[color=red]问题：当页面出现多个form表单时，如何用不同的方法来进行验证？[/color]
四、修改struts.xml中RegisterAction的配置，添加一个method属性，指定acton要执行的方法abc：


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

五、在RegisterAction中创建Action要执行的abc方法：


public String abc() throws Exception {

		System.out.println("abc method invoked");
		return SUCCESS;
	}

[color=red]问题：当在RegisterAction类中有多个的表单的action需要验证该怎么办？[/color]
六、在struts.xml中添加一个需要用到xyz方法的Action：


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

	<action name="zly" class="com.test.action.RegisterAction" method="xyz">
		<result name="success">/success.jsp</result>
		<result name="input">/register2.jsp</result>
	</action>

七、在RegisterAction类中创建对应的action验证方法：


public String abc() throws Exception {

		System.out.println("abc() method invoked");
		return SUCCESS;
	}

	public void validateAbc(){

		System.out.println("validateAbc() invoked");
	}

控制台输出效果：

[img]http://dl.iteye.com/upload/attachment/388801/ea43fe52-5be4-368c-b455-435eb112279b.jpg[/img]
[color=red]说明：[/color]在RegisterAction中如果自定义了验证的方法如validateAbc(),但是同样会执行validate验证的方法，这是不科学的，所以可以不重写validate方法，但是execute方法有没有验证了，所以validate方法可以写成validateExexute()方法。

struts2学习笔记七（第7讲.Struts2的输入校验续二）

struts2学习笔记九（第9讲.Struts2的校验框架续）

struts2学习笔记四（第4讲.Struts2的类型转换续）

struts2学习笔记八（第8讲.Struts2的校验框架）

struts2学习笔记六（第6讲.Struts2的输入校验续一）

struts2学习笔记二（第2讲.Struts2入门与配置续）