文件上传和下载

文件上传

文件上传的两个jar

<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3.1</version>
</dependency>

<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.4</version>
</dependency>

Upload.jsp

<%--文件上传--%>
<form action="user/upload" method="post" enctype="multipart/form-data">
<input type="file" name="upload"/><br>
<button type="submit">上传</button>
</form>

Struts.xml


<action name="upload" class="cn.xcq.entity.Action1" method="upload">
<result>/success.jsp</result>
</action>

public class Action1 {

    private File upload;
    private String uploadFileName;
    private String uploadContentType;

/*文件上传*/
public String upload(){

    //文件上传路径
    String path="g:/FileUploader";
    String realPath=path+File.separatorChar+uploadFileName;

    try {
        FileUtils.copyFile(upload,new File(realPath));
    } catch (IOException e) {
        e.printStackTrace();
    }

    return "success";

}

public File getUpload() {
        return upload;
    }

    public void setUpload(File upload) {
        this.upload = upload;
    }

    public String getUploadFileName() {
        return uploadFileName;
    }

    public void setUploadFileName(String uploadFileName) {
        this.uploadFileName = uploadFileName;
    }

    public String getUploadContentType() {
        return uploadContentType;
    }

    public void setUploadContentType(String uploadContentType) {
        this.uploadContentType = uploadContentType;
    }
}

在Action中使用了三个属性封装文件信息

File类型的XXX属性，与表单的File控件的name属性一样，用于封装File控件对应的文件内容

String类型的xxxFileName属性，该属性名称由前面的File类型属性和FileName组合，是固定的语法，是封装File控件对应文件的文件名

String类型的XXXContentType属性，同样由xxx属性和ContentType组合而成，是固定语法，封装File控件对应文件的文件类型

文件下载

Index.jsp

<form action="user/download" method="post">
<input type="text" name="inputPath">
<button type="submit">下载</button>
</form>

Struts.xml


<action name="download" class="cn.xcq.entity.DownLoad" method="download">
    <result name="success" type="stream">
        <param name="contentDisposition">attachment;filename=${fileName}</param>
    </result>
</action>

DownLoad

public class DownLoad {

    //读取下载文件的目录
    private String inputPath;

    //下载文件的文件名
    private String fileName;

    //读取下载文件的输入流
    private InputStream inputStream;

    //下载文件的类型
    private String conetntType;

    public String download(){
        try {
            inputStream=new FileInputStream(inputPath);
            //获取文件明
            fileName= inputPath.substring(inputPath.lastIndexOf("\")+1);
            //解决中文乱码问题
            try {
                fileName= URLEncoder.encode(fileName,"UTF-8");
            } catch (Exception e) {
                e.printStackTrace();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "success";
    }

    public String getInputPath() {
        return inputPath;
    }

    public void setInputPath(String inputPath) {
        this.inputPath = inputPath;
    }

    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;
    }

    public String getConetntType() {
        return conetntType;
    }

    public void setConetntType(String conetntType) {
        this.conetntType = conetntType;
    }
}

Name属性值要一致