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 = \u5e74\u9f84\u8f93\u5165\u683c\u5f0f\u6709\u8bef
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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