Struts2之下载

下载页面

<%@ 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>Insert title here</title>
</head>
<body>
<a href="download.action?FileName=Java.pdf">下载</a>
</body>
</html>

struts.xml配置

<?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>
<!-- 开启开发者模式 -->
<constant name="struts.devMode" value="true"></constant>
<package name="jiangwenwen" namespace="/" extends="struts-default">
    <action name="download" class="cn.jiangwenwen.action.DownLoadAction" method="download">
        <result name="success" type="stream">
            <param name="contentDisposition">
                attachment;filename="${fileName}"
            </param>
            <param name="contentLength">
                ${fileSize}
            </param>
            <param name="contentType">
                ${contentType}
            </param>
            
        </result>
    </action>
</package>
</struts>

Action类

public class DownLoadAction extends ActionSupport{
    
    private String contentType;
    
    private String FileName;
    
    private InputStream inputStream;
    
    private long fileSize;
    
    public String download() throws FileNotFoundException {
        
        
        String rootpath = ServletActionContext.getServletContext().getRealPath("/");
        
        System.out.println(rootpath);
        
        System.out.println(FileName);
        
        File file = new File(rootpath+"/download/"+FileName);
        
        fileSize = file.length();
        
        inputStream = new FileInputStream(file);
        
        return SUCCESS;
        
        
    
    }

    public String getContentType() {
        return contentType;
    }

    public void setContentType(String contentType) {
        this.contentType = contentType;
    }

    public String getFileName() {
        return FileName;
    }

    public void setFileName(String fileName) {
        FileName = fileName;
    }



    public InputStream getInputStream() {
        return inputStream;
    }

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

    public long getFileSize() {
        return fileSize;
    }

    public void setFileSize(long fileSize) {
        this.fileSize = fileSize;
    }
    
}

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