Struts2上传下载

 

struts2 实现文件上传和下载

标签： struts2upload上传下载

2014-01-13 17:29 2900人阅读 评论(2) 收藏 举报

 分类：

WEB开发（12） 

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目录(?)[+]

 

项目目录：

web.xml：主要是配好struts2

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    id="WebApp_ID" version="3.0">
    <display-name>uploadTest</display-name>

    <!-- struts2配置 -->
    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>

</web-app>

struts.xml：配好上传下载的两个action。 

<?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>

    <constant name="struts.devMode" value="true" />

    <package name="default" namespace="/" extends="struts-default">

        <!-- 上传 -->
        <action name="uploadAction" class="upload.UploadAction">
            <result>index.jsp</result>
            <result name="input">index.jsp</result>

            <interceptor-ref name="fileUpload">
                <!-- 不写下面两个参数为允许所有大小所有类型的文件的上传 -->
                <param name="maximumSize">1024000</param>
                <param name="allowedTypes">
                    application/msword,image/jpeg
                </param>
            </interceptor-ref>
            <interceptor-ref name="defaultStack" />

        </action>

        <!-- 下载 -->
        <action name="downloadAction" class="upload.DownloadAction">
            <result type="stream">
                <!-- 文件类型 —— application/octet-stream 表示无限制 -->
                <param name="contentType">application/octet-stream</param>
                <!-- 流对象名 —— 去找Action中的getInputStream方法 -->
                <param name="inputName">inputStream</param>
                <!-- 文件名 —— 将调用该Action中的getFileName方法 -->
                <param name="contentDisposition">attachment;filename="${fileName}"</param>
                <param name="bufferSize">4096</param>
            </result>
        </action>
    </package>

</struts>

UploadAction.java

package upload;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport {
    private static final long serialVersionUID = 1L;

    private File myFile;//上传的文件，对应表单的file的name属性
    private String myFileContentType;//文件类型，xxxContentType，xxx对应表单file的name属性
    private String myFileFileName;

    @Override
    public String execute() throws Exception {
        if (myFile == null) {
            this.addFieldError("file", "文件不能为空，请选择");
            return INPUT;
        } else {
            InputStream is = new FileInputStream(this.getMyFile());
            OutputStream os = new FileOutputStream(new File("F:/", this.getMyFileFileName()));
            byte[] buf = new byte[1024];
            int length = 0;
            while ((length = is.read(buf)) > 0) {
                os.write(buf, 0, length);
            }
            is.close();
            os.close();
        }
        return SUCCESS;
    }

    public File getMyFile() {
        return myFile;
    }

    public void setMyFile(File myFile) {
        this.myFile = myFile;
    }

    public String getMyFileContentType() {
        return myFileContentType;
    }

    public void setMyFileContentType(String myFileContentType) {
        this.myFileContentType = myFileContentType;
    }

    public String getMyFileFileName() {
        return myFileFileName;
    }

    public void setMyFileFileName(String myFileFileName) {
        this.myFileFileName = myFileFileName;
    }

}

DownloadAction.java

package upload;

import java.io.InputStream;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class DownloadAction extends ActionSupport {
    private static final long serialVersionUID = 1L;

    private String fileName;//要下载的文件名
    private InputStream inputStream;

    @Override
    public String execute() throws Exception {
        inputStream = ServletActionContext.getServletContext().getResourceAsStream("/" + fileName);
        return SUCCESS;
    }

    public String getFileName() {
        return fileName;
    }

    public void setFileName(String fileName) {
        this.fileName = fileName;
    }

    public InputStream getInputStream() {
        return inputStream;
    }

    public void setInputStream(InputStream inputStream) {
        this.inputStream = inputStream;
    }
}

index.jsp:访问：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s" %>

<!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>Insert title here</title>
</head>
<body>

    <!-- 上传 -->
    <s:form action="uploadAction" enctype="multipart/form-data" method="post">
        <s:file name="myFile"></s:file>
        <s:submit />
    </s:form>

    <!-- 下载 -->
    <a href="downloadAction?fileName=index.jsp">下载index.jsp文件</a>

</body>
</html>