Struts2框架（二）

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    "http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>

    <package name="config" namespace="/user" extends="struts-default" abstract="false">
        
        <!-- 
        <action name="login" class="cn.itcast.a_config.UserAction" method="login">
            <result name="success">/index.jsp</result>            
        </action>
        <action name="register" class="cn.itcast.a_config.UserAction" method="register">
            <result name="success">/index.jsp</result>            
        </action>
         -->        
         
         <!-- 使用通配符优化上面的步骤 -->
         <!-- http://localhost:8080/struts02/user_login -->
         <action name="user_*" class="cn.itcast.a_config.UserAction" method="{1}">
            <result name="{1}">/{1}.jsp</result>            
        </action>
        
    </package>    
    
</struts>

指定默认编码集，作用于HttpServletRequest的setCharacterEncoding方法和freemarker、velocity的输出。
<constant name="struts.i18n.encoding" value="UTF-8"/>

自定义后缀修改常量
<constant name="struts.action.extension" value="do"/>

设置浏览器是否缓存静态内容，默认值为true（生产环境下使用），开发阶段最好关闭。
<constant name="struts.configuration.xml.reload" value="true"/>

开发模式下使用，这样可以打印出更详细的错误信息
<constant name="struts.devMode" value="true"/>

默认的视图主题
<constant name="struts.ui.theme" value="simple"/>

与spring集成时，指定由spring负责action对象的创建
<constant name="struts.objectFactory" value="spring"/>

该属性设置Struts2是否支持动态方法调用，该属性的默认值是true。如果需要关闭动态方法的调用，则可设置该属性为false。
<constant name="struts.enable.DynamicMethodInvocation" value="false"/>

上传文件的大小限制
<constant name="struts.multipart.maxSize" value="10701096"/>

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    "http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>

    <package name="config2" namespace="/" extends="struts-default">
    
        <!-- 动态方法调用: http://locahost:8080/struts02/user!login -->
        <action name="user" class="cn.yly.UserAction">
            <result name="success">/index.jsp</result>            
        </action>
        
    </package>    
    
</struts>

                <!-- 配置全局跳转视图 -->
        <global-results>
            <result name="success">/index.jsp</result>
        </global-results>            

<!-- 配置各项默认值 -->
         <!-- 
              name  只配置了访问路径名称
              class 默认执行的action在struts-default有配置
                      <default-class-ref class="com.opensymphony.xwork2.ActionSupport" />
              method  默认为execute
              默认的方法execute返回值为success,对应的页面去全局视图找。
              
          -->
         <action name="test"></action>

<!-- 什么情况不配置class？ 即处理的aciton -->
        <!-- 答案： 当只是需要跳转到WEB-INF下资源的时候。 -->
         <action name="test2">
             <result name="success">/WEB-INF/index.jsp</result>
         </action>

// 1. 请求数据封装； 2. 调用Service处理业务逻辑，拿到结果数据
        
        // 3. 数据保存到域中
        
        
        // Struts中对数据操作，方式1： 直接拿到ServletApi, 执行操作
        HttpServletRequest request = ServletActionContext.getRequest();
        HttpSession session = request.getSession();
        ServletContext application = ServletActionContext.getServletContext();
        // 操作
        request.setAttribute("request_data", "request_data1");
        session.setAttribute("session_data", "session_data1");
        application.setAttribute("application_data", "application_data1");

// 【推荐：解耦的方式实现对数据的操作】
        // Struts中对数据操作，方式2： 通过ActionContext类 
        ActionContext ac = ActionContext.getContext();
        // 得到Struts对HttpServletRequest对象进行了封装，封装为一个map
        // 拿到表示request对象的map
         Map<String,Object> request =  ac.getContextMap(); 
         // 拿到表示session对象的map
         Map<String, Object> session = ac.getSession();
         // 拿到表示servletContext对象的map
         Map<String, Object> application = ac.getApplication();
         
         // 数据
         request.put("request_data", "request_data1_actionContext");
        session.put("session_data", "session_data1_actionContext");
        application.put("application_data", "application_data1_actionContext");

/**
 * 数据处理, 方式3： 实现接口的方法
 * @author Jie.Yuan
 *
 */
public class DataAction extends ActionSupport implements RequestAware, SessionAware, ApplicationAware{
    
    private Map<String, Object> request;
    private Map<String, Object> session;
    private Map<String, Object> application;
    
    // struts运行时候，会把代表request的map对象注入
    @Override
    public void setRequest(Map<String, Object> request) {
        this.request = request;
    }
    
    // 注入session
    @Override
    public void setSession(Map<String, Object> session) {
        this.session = session;
    }
    
    // 注入application
    @Override
    public void setApplication(Map<String, Object> application) {
        this.application = application;
    }


    @Override
    public String execute() throws Exception {
        
         // 数据
         request.put("request_data", "request_data1_actionAware");
        session.put("session_data", "session_data1_actionAware");
        application.put("application_data", "application_data1_actionAware");        
        return SUCCESS;
    }

}

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title></title>
</head>
<body>
<form action="${pageContext.request.contextPath}/fileUploadAction" method="post" enctype="multipart/form-data">
    用户名：<input type="text" name="userName"/><br/>
    文件：<input type="file" name="file1"/><br/>
    <input type="submit" value="提交"/>
</form>
</body>
</html>

package com.yly;

import com.opensymphony.xwork2.ActionSupport;
import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;

import java.io.File;


public class UploadAction extends ActionSupport {
    private File file1;
    private String file1FileName;
    private String file1ContentType;

    public File getFile1() {
        return file1;
    }

    public void setFile1(File file1) {
        this.file1 = file1;
    }

    public String getFile1FileName() {
        return file1FileName;
    }

    public void setFile1FileName(String file1FileName) {
        this.file1FileName = file1FileName;
    }

    public String getFile1ContentType() {
        return file1ContentType;
    }

    public void setFile1ContentType(String file1ContentType) {
        this.file1ContentType = file1ContentType;
    }

    @Override
    public String execute() throws Exception {
        //获取上传的目录的路径
        String path = ServletActionContext.getServletContext().getRealPath("/upload");
        File file = new File(path, file1FileName);
        FileUtils.copyFile(file1, file);
        return "success";
    }
}

<!-- 注意： action 的名称不能用关键字"fileUpload" -->
        <action name="fileUploadAction" class="cn.itcast.e_fileupload.FileUpload">
        
            <!-- 限制运行上传的文件的类型 -->
            <interceptor-ref name="defaultStack">
                
                <!-- 限制运行的文件的扩展名 -->
                <param name="fileUpload.allowedExtensions">txt,jpg,jar</param>
                
                <!-- 限制运行的类型   【与上面同时使用，取交集】
                <param name="fileUpload.allowedTypes">text/plain</param>
                -->
                
            </interceptor-ref>
            
            <result name="success">/e/success.jsp</result>
            
            <!-- 配置错误视图 -->
            <result name="input">/e/error.jsp</result>
        </action>

package com.yly;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.dispatcher.RequestMap;

import java.io.File;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

/**
 * 文件下载
 * 1.显示所有要下载文件的列表
 * 2.文件下载
 */
public class DownAction extends ActionSupport {
    /**
     * 显示所有要下载的文件列表
     *
     * @return
     * @throws Exception
     */
    public String list() throws Exception {
        //得到upload目录
        String path = ServletActionContext.getServletContext().getRealPath("/upload");
        //目录对象
        File file = new File(path);
        //得到所有要下载的文件的文件名
        String[] fileNames = file.list();
        //保存
        ActionContext ac = ActionContext.getContext();
        RequestMap requestMap = (RequestMap) ac.get("request");
        requestMap.put("fileNames", fileNames);
        return "list";
    }

    //1.获取要下载文件的文件名
    private String fileName;

    public void setFileName(String fileName) {
        //处理传入的参数中文问题（get提交）
        try {
            fileName = new String(fileName.getBytes("ISO8859-1"), "UTF-8");
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e);
        }
        //把处理好的文件名赋值
        this.fileName = fileName;
    }

    /**
     * 2.文件下载提交的业务方法（在struts.xml中配置返回stream）
     *
     * @return
     * @throws Exception
     */
    public String down() throws Exception {

        return "download";
    }

    //3.返回文件流的方法
    public InputStream getAttrInputStream() {
        return ServletActionContext.getServletContext().getResourceAsStream("/upload/" + fileName);
    }

    //4.下载显示的文件名（浏览器显示的文件名）
    public String getDownFileName() {
        //需要进行中文编码
        try {
            fileName = URLEncoder.encode(fileName, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e);
        }
        return fileName;
    }
}

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
        "http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
    <package name="upload" extends="struts-default">
        <action name="fileUploadAction" class="com.yly.UploadAction" method="execute">
            <result name="success">/index.jsp</result>
        </action>

        <action name="down_*" class="com.yly.DownAction" method="{1}">
            <result name="list">/list.jsp</result>

            <result name="download" type="stream">
                <!-- 运行下载的文件类型：指定为所有的二进制文件类型 -->
                <param name="contentType">application/octet-stream</param>

                <!-- 对应的是Action中的属性：返回流的属性【其实就是getAttrInputStream()】 -->
                <param name="inputName">attrInputStream</param>

                <!-- 下载头，包括：浏览器显示的文件名 -->
                <param name="contentDisposition">attachment;filename=${downFileName}</param>

                <!-- 缓冲区大小设置 -->
                <param name="bufferSize">1024</param>
            </result>
        </action>
    </package>
</struts>

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>下载列表</title>
</head>
<body>
<table border="1">
    <tr>
        <th>编号</th>
        <th>文件名</th>
        <th>操作</th>
    </tr>
    <c:forEach var="fileName" items="${fileNames}" varStatus="vs">
        <tr>
            <td>${vs.count}</td>
            <td>${fileName}</td>
            <td>
                <c:url var="url" value="down_down">
                    <c:param name="fileName" value="${fileName}"></c:param>
                </c:url>
                <a href="${url}">下载</a>
            </td>
        </tr>
    </c:forEach>
</table>
</body>
</html>