第八篇——Struts2的处理结果类型

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/javaee
                      http://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;
    }

    @Override
    public 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!