struts2实现文件上传和下载

客官°小女子只卖身不卖艺 2022-09-17 14:17 179阅读 0赞

文件上传内容：![微笑][smile.gif]

在jsp页面form表格如下：

在Action中代码如下：

package cn.itcast.up;
    
    import java.io.FileInputStream;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    import java.io.InputStream;
    import java.io.OutputStream;
    
    import org.apache.struts2.ServletActionContext;
    
    import cn.itcast.formdata.Formdata;
    
    import com.opensymphony.xwork2.ActionSupport;
    import com.opensymphony.xwork2.ModelDriven;
    
    @SuppressWarnings("serial")
    public class OneAction extends ActionSupport implements ModelDriven<Formdata>{
    	
    	private Formdata formdata = new Formdata();
    
    	public Formdata getModel() {
    		return formdata;
    	}
    	
    	public String execute() throws Exception{
    		System.out.println("文件类型："+formdata.getFileFileContenType());
    		
    		String str = ServletActionContext.getServletContext().getRealPath("/up");
    		
    		str = str + "/" + formdata.getFileFileName();
    
    		System.out.println("............"+formdata.getFile());
    	
    		InputStream in = new FileInputStream(formdata.getFile());
    		OutputStream out = new FileOutputStream(str);
    		byte[] b = new byte[1024];
    		int len = 0;
    		while((len=in.read(b))!=-1){
    			out.write(b,0,len);
    		}
    		out.close();
    		in.close();
    
    		return "success";
    	}
    	
    
    }

package cn.itcast.formdata;
    
    import java.io.File;
    
    public class Formdata {
    	
    	private File file;
    	private String fileFileName;
    	private String fileFileContenType;
    	public File getFile() {
    		return file;
    	}
    	public void setFile(File file) {
    		this.file = file;
    	}
    	public String getFileFileName() {
    		return fileFileName;
    	}
    	public void setFileFileName(String fileFileName) {
    		this.fileFileName = fileFileName;
    	}
    	public String getFileFileContenType() {
    		return fileFileContenType;
    	}
    	public void setFileFileContenType(String fileFileContenType) {
    		this.fileFileContenType = fileFileContenType;
    	}
    
    	
    }

在struts.xml文件中配置：

<struts>
     <constant name="struts.action.extension" value="action,do,"/>
     <constant name="struts.i18n.encoding" value="UTF-8"></constant>
     <package name="itcast" extends="struts-default">
         <action name="one" class="cn.itcast.up.OneAction">
            <result name="success">/index.jsp</result>
         </action>       
     </package>
    </struts>

文件下载代码如下：

package cn.itcast.formdata;
    
    import java.io.InputStream;
    import java.net.URLEncoder;
    
    import org.apache.struts2.ServletActionContext;
    
    import com.opensymphony.xwork2.ActionSupport;
    
    @SuppressWarnings("serial")
    public class DownAction extends ActionSupport{
    
    	private String fileName;
    
    	public String getFileName() {
    		return fileName;
    	}
    	public void setFileName(String fileName) {
    		this.fileName = fileName;
    	}
    	public InputStream getFile(){
    		System.err.println("得到 文件对像....");
    		InputStream in = 
    			ServletActionContext.getServletContext()
    			.getResourceAsStream("/up/a.jpg");
    		return in;
    	}
    	public String execute() throws Exception {
    		String ss = "你好.jpg";
    		ss = URLEncoder.encode(ss,"UTF-8");
    		setFileName(ss);
    		System.err.println("execute....");
    		return SUCCESS;
    	}
    }

struts.xml文件配置如下：

<action name="down" class="cn.itcast.down.DownAction">
    			<result type="stream">
    				<param name="contentType">image/jpeg</param>
                       
                                         <param name="inputName">inputStream</param>
    			
    	                            <param name="contentDisposition">attachment;filename=${fileName}</param>
    				<param name="bufferSize">4096</param>
    				
    				<param name="inputName">file</param>
    			</result>
                               <result name="input">/WEB-INF/pages/inputError.jsp</result>
    
    </action>
    
    
    
     
     
    
     
      参考API SteamResult（http://struts.apache.org/2.0.14/struts2-core/apidocs/org/apache/struts2/dispatcher/StreamResult.html），其中
     contentType是内容类型，根据不同文件类型参照MIME标准设置，本例是文本。
     contentDisposition是文件下载的处理方式，包括内联(inline)和附件(attachment)，默认是inline, 使用附件时这样配置：attachment;filename="文件名" 。

[smile.gif]: /images/20220828/a4fc5ad4c9404ea6926105bd59823f1a.png