struts2实现对指定方法添加输入校验功能并格式化错误信息显示位置

骑猪看日落 2022-05-23 10:52 131阅读 0赞

#### 【例】添加用户 ####

#### 1.创建addUser.jsp ####

<form action="Manager!user_add" method="post">		
    			<table>
    				<tr>
    					<td>用户名:</td>
    					<td><input type="text" name="user.username" value="<s:property value="user.username"/>"></td>
    					<td><font color="red">*<s:property value="fieldErrors.username[0]" /> </font></td>
    				</tr>
    				<tr>
    					<td>密码:</td>
    					<td><input type="password" name="user.password" value="<s:property value="user.password"/>"></td>
    					<td><font color="red">*<s:property value="fieldErrors.password[0]" /> </font></td>
    				</tr>
    				<tr>
    				<td>姓名:</td>
    					<td><input type="text" name="user.name" value="<s:property value="user.name"/>"></td>
    					<td><font color="red">*<s:property value="fieldErrors.name[0]" /> </font></td>
    				</tr>
    				<tr>
    					<td>性别:</td>
    					<td>
    					<input type="radio" name="user.sex" value="男" checked="checked">男
    					<input type="radio" name="user.sex" value="女">女
    					</td>					
    				</tr>
    				<tr>
    					<td>出生日期:</td>
    					<td><input type="date" name="user.birthday" value="<s:property value="user.birthday"/>"></td>
    					<td><font color="red">*<s:property value="fieldErrors.birthday[0]" /> </font></td>
    				</tr>
    				<tr>
    					<td>Email:</td>
    					<td><input type="text" name="user.email" value="<s:property value="user.email"/>"></td>
    				</tr>
    				<tr>
    					<td>地址:</td>
    					<td><input type="text" name="user.address" value="<s:property value="user.address"/>"></td>
    				</tr>
    				<tr>
    					<td></td>
    					<td><input type="submit" value="添加"></td>
    				</tr>				
    			</table>
    			<font color="red"><p>注意: *为必填信息。</p></font>
    			</form>

#### 2.创建Action ####

package com.mxl.actions;
    import java.util.List;
    import javax.servlet.http.HttpServletRequest;
    import org.apache.struts2.ServletActionContext;
    import com.mxl.dao.UserDao;
    import com.mxl.models.User;
    import com.opensymphony.xwork2.ActionContext;
    import com.opensymphony.xwork2.ActionSupport;
    public class UserManager extends ActionSupport {
    	private User user;	
    	private List<User>users;
    	private UserDao userDao=new UserDao();
    	private boolean flag;
    	private HttpServletRequest request;
    	public void validateUser_add() {
    		if(user.getUsername()==null||user.getUsername().length()<=0){
    			this.addFieldError("username", "请输入用户名");  
    		}
    		if(user.getPassword()==null||user.getPassword().length()<=0){
    			this.addFieldError("password", "请输入密码");  
    		}
    		if(user.getName()==null||user.getName().length()<=0){
    			this.addFieldError("name", "请输入姓名");  
    		}
    		if(user.getBirthday()==null){
    			this.addFieldError("birthday", "请输入出生日期");  
    		}
    	}
    	public String user_add(){
    		request=ServletActionContext.getRequest();
    		String sex=request.getParameter("user.sex");
    		user.setSex(sex);
    		flag=userDao.insertUser(user);
    		if(flag==true){
    			ActionContext.getContext().put("message", "添加成功");
    			return SUCCESS;
    		}else{
    			ActionContext.getContext().put("message", "添加失败");
    			return INPUT;
    		}
    	}
    	public List<User> getUsers() {
    		return users;
    	}
    	public void setUsers(List<User> users) {
    		this.users = users;
    	}	
    	public User getUser() {
    		return user;
    	}
    	public void setUser(User user) {
    		this.user = user;
    	}
    }

#### 3.配置struts.xml ####

<action name="Manager" class="com.mxl.actions.UserManager" >			
    			<result>/right.jsp</result>
    			<result name="input">/addUser.jsp</result>					
    		</action>

#### 运行效果： ####

![20180607143031282][]

[20180607143031282]: /images/20220523/1ef4185f7cc94187be2704bf2f4c47ab.png