一、简单表单验证示例
structs.xml配置
<struts>
<package name="validate" namespace="/validate" extends="struts-default" >
<action name="ValidateDemo" class="cn.hjp.validate.ValidateDemo">
<result name="success" type="dispatcher" >/validate/index.jsp</result>
<result name="input" type="dispatcher" >/validate/index.jsp</result>
</action>
</package>
</struts>
前端index页面部分代码：fielderror显示错误信息，如果前端页面HTML标签是使用的structs2标签构成，则可以不使用fielderror标签也能显示，如下面注释中代码
<%@ taglib prefix="s" uri="/struts-tags" %>
<!--
<body>
<s:form action="ValidateDemo" namespace="/validate" >
<s:textfield name="name" label="用户名" ></s:textfield>
<s:submit value="提交" ></s:submit>
</s:form>
</body>
-->
<body>
<form action="/struts2-demo/validate/ValidateDemo.action" method="post" >
<input type="text" name="name" /><input type="submit" value="提交"/>
</form>
<s:fielderror fieldName="name" />
</body>
验证判断代码写在validate方法中
public class ValidateDemo extends ActionSupport {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String execute() throws Exception {
// TODO Auto-generated method stub
System.out.println(this.toString());
return SUCCESS;
}
@Override
public void validate() {
// TODO Auto-generated method stub
if (this.name == null || this.name.equals("")) {
addFieldError("name", "姓名不能为空");
}
}
}
时间： 2024-08-30 03:24:03