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  • Struts2学习九----------处理结果类型(input)

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    Struts2处理结果类型

      - SUCCESS:Action正确的执行完成,返回相应的视图,success是name属性的默认值

      - ERROR:表示Action执行失败,返回到错误处理视图

      - NONE:表示Action正确的执行完成,但是不返回任何视图

      - LOGIN:Action因为用户没有登录的原因没有正确执行,将返回登录视图,要求用户进行登录验证

      - INPUT:Action执行,需要从前端页面获取参数,input就是代表这个参数输入的界面,一般应用中会对这些参数进行验证,如果验证没有通过,将自动返回该视图

    实例:

    1.项目结构

    2.pom.xml

    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
      
    	<modelVersion>4.0.0</modelVersion>
    	
    	<groupId>org.struts</groupId>
    	<artifactId>Struts2-INPUT</artifactId>
    	<packaging>war</packaging>
    	<version>0.0.1-SNAPSHOT</version>
    	<name>Struts2-INPUT Maven Webapp</name>
    	<url>http://maven.apache.org</url>
    	
    	<properties>
    		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    		<struts.version>2.5.10</struts.version>
    	</properties>
    	
    	<dependencies>
    		<!-- junit -->
    		<dependency>
    			<groupId>junit</groupId>
    			<artifactId>junit</artifactId>
    			<version>4.12</version>
    			<scope>test</scope>
    		</dependency>
    		<!-- Struts2 -->
    		<dependency>
    		    <groupId>org.apache.struts</groupId>
    		    <artifactId>struts2-core</artifactId>
    		    <version>${struts.version}</version>
    		</dependency>
    	</dependencies>
      
    	<build>
    		<finalName>Struts2-INPUT</finalName>
    	</build>
    	
    </project>
    

    3.web.xml

    <?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns="http://java.sun.com/xml/ns/javaee"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
                          http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
      version="3.0">
      
      	<welcome-file-list>
      		<welcome-file>user.jsp</welcome-file>
      	</welcome-file-list>
      
      	<!-- struts2过滤器 -->
      	<filter>
      		<filter-name>struts2</filter-name>
      		<filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>
      	</filter>
      	<filter-mapping>
      		<filter-name>struts2</filter-name>
      		<url-pattern>/*</url-pattern>
      	</filter-mapping>
      
    </web-app>
    

    4.UserAction.java

    package org.struts.action;
    
    import com.opensymphony.xwork2.ActionSupport;
    
    public class UserAction extends ActionSupport {
    
    	private static final long serialVersionUID = 1L;
    	
    	private String username;
    	private int age;
    	
    	public String save() {
    
    		return SUCCESS;
    		
    	}
    	
    	@Override
    	public void validate() {
    		
    		if (username == null || "".equals(username)) {
    			this.addFieldError("username", "用户名不能为空");
    		}
    		
    	}
    
    	public String getUsername() {
    		return username;
    	}
    
    	public void setUsername(String username) {
    		this.username = username;
    	}
    
    	public int getAge() {
    		return age;
    	}
    
    	public void setAge(int age) {
    		this.age = age;
    	}
    
    }
    

    5.struts.xml

    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE struts PUBLIC
            "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
            "http://struts.apache.org/dtds/struts-2.5.dtd">
    <struts>
    	
    	<package name="default" extends="struts-default" namespace="/">
    		
    		<action name="user" class="org.struts.action.UserAction" method="save">
    			<result>/success.jsp</result>
    			<result name="input">/user.jsp</result>
    		</action>
    		
    	</package>
    	
    	<constant name="struts.custom.i18n.resources" value="messageResource"></constant>
    	
    </struts>
    

    6.messageResource.properties

    # 方式一:统一指定类型转换失败的错误提示信息 {0}表示输入框的name值
    #xwork.default.invalid.fieldvalue={0} failure
    # 方式二:单独指定某个输入框类型转换失败的提示信息,中文需转换为对应的ASCII码,否则页面会乱码
    invalid.fieldvalue.age = u5e74u9f84u8f93u5165u683cu5f0fu6709u8bef

    7.user.jsp

    <%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <%@ taglib prefix="s" uri="/struts-tags" %>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>用户信息</title>
    </head>
    <body>
    	<form action="user" method="post">
    		姓名:<input type="text" name="username"/><s:fielderror fieldName="username"/><br/>
    		年龄:<input type="text" name="age"/><s:fielderror fieldName="age"/><br/>
    		<input type="submit" value="提交"/>
    		<input type="reset" value="重置"/>
    	</form>
    </body>
    </html>
    

    8.success.jsp

    <%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>成功页面</title>
    </head>
    <body>
    	保存成功了...
    </body>
    </html>
    

    9.效果预览

    10.格式转换失败

      在action中的validate方法中可以对页面属性进行校验,但是无法进行格式转换失败这样的校验(比如age的类型是int,但是前端页面输入abc),此时页面会提示内置的错误提示

      

      此时可以通过在struts.xml中指定<constant name="struts.custom.i18n.resources" value="messageResource">进行配置,修改提示信息

      具体配置可以查看messageResource.properties中的注释

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  • 原文地址:https://www.cnblogs.com/jinjiyese153/p/6899847.html
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