Struts2处理结果类型

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

2、ERROR：表示Action执行失败，返回到错误处理视图；

3、NONE：表示Action正确的执行完成，但是不返回任何视图；

4、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；

5、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。

项目实例：

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>com.ray</groupId><artifactId>struts2Test</artifactId><packaging>war</packaging><version>1.0-SNAPSHOT</version><name>struts2Test Maven Webapp</name><url>http://maven.apache.org</url><dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>3.8.1</version><scope>test</scope></dependency><!-- https://mvnrepository.com/artifact/org.apache.struts/struts2-core --><dependency><groupId>org.apache.struts</groupId><artifactId>struts2-core</artifactId><version>2.5.16</version></dependency></dependencies><build><finalName>struts2Test</finalName></build></project>

3、web.xml

<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/javaeehttp://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"version="3.0" metadata-complete="true"><display-name>Archetype Created Web Application</display-name><!-- 过滤所有请求交给Struts2处理 --><filter><filter-name>struts2</filter-name><filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class><!--action后缀（方法二）--><!--<init-param>--><!--<param-name>struts.action.extension</param-name>--><!--<param-value>ray</param-value>--><!--</init-param>--></filter><filter-mapping><filter-name>struts2</filter-name><url-pattern>/*</url-pattern></filter-mapping></web-app>

4、UserAction.java

package com.ray.action;import com.opensymphony.xwork2.ActionSupport;/*** Created by Ray on 2018/3/26 0026.**/
public class UserAction extends ActionSupport {private String username;private int age;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;}public String save(){return SUCCESS;}@Overridepublic void validate() {if(username == null || "".equals(username)){this.addFieldError("username","用户名不能为空");}}
}

5、eighth-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="com.ray.action.UserAction" method="save"><result>/loginSuccess.jsp</result><result name="input">/user.jsp</result></action></package><constant name="struts.custom.i18n.resources" value="messageResource"/>
</struts>

6、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><!-- action后缀（方法一） --><!--<constant name="struts.action.extension" value="ra"/>--><package name="default" namespace="/" extends="struts-default"><!-- 默认action --><default-action-ref name="404"/><action name="404"><result>/404.jsp</result></action><action name="helloWorld" class="com.ray.action.HelloWorldAction"><result name="success">/success.jsp</result></action></package><include file="second-struts.xml"/><include file="third-struts.xml"/><include file="fourth-struts.xml"/><include file="seventh-struts.xml"/><include file="eighth-struts.xml"/>
</struts>

7、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

8、user.jsp

<%@ taglib prefix="s" uri="/struts-tags" %>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %>
<%String path = request.getContextPath();String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head><base href="<%=basePath%>"><title>用户信息</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"><meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body><s:form action="user" method="POST"><s:textfield label="姓名：" name="username"/><s:fielderror fieldName="username"/><br><s:textfield label="年龄：" name="age"/><s:fielderror fieldName="age"/><br><s:submit label="提交"/></s:form>
</body>
</html>

9、loginSuccess.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %>
<%String path = request.getContextPath();String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head><base href="<%=basePath%>"><title成功页面</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"><meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body>保存成功！
</body>
</html>

10、页面效果

ok!