struts文件上传和显示

1，文件上传

 

在jsp中：

<form action="uploadFile.action" method="post" enctype="multipart/form-data">

<input type="file" name="file"/>
<input type="submit" value="上传"/>
</from>

 在上传的action中

private File file;
	private String fileFileName;
	private String fileContentType;

	public String uploadFile() throws IOException{
		String path = ServletActionContext.getServletContext().getRealPath("/upload");
		InputStream input = new FileInputStream(file);
		OutputStream out = new FileOutputStream(new File(path+fileFileName));
                 //上传的文件所放位置
		byte[] buffer = new byte[1024];
		int len =-1;
		while((len=input.read(buffer))!= -1){
			out.write(buffer, 0, len);
		}
		
		out.flush();
		out.close();
		input.close();
		return "success";
	}

 注意：上面的全局变量前面必须和JSP里面的input标签里面的file的name属性相同。

<input type="file" name="file"/>

private File file;
private String fileFileName;
private String fileContentType;

以上就是上传的action代码了。

2，显示的代码

 

在action里面：

public String xianshi() throws IOException{
		//显示也就是相当于下载显示。
		String path = ServletActionContext.getServletContext().getRealPath("/upload");
		InputStream input = new FileInputStream(new File(path+fileFileName));
		OutputStream out = response.getOutputStream();
		byte[] buffer = new byte[1024];
		int len =-1;
		while((len=input.read(buffer)) != -1){
			out.write(buffer,0,len);
			
		}
		out.flush();
		out.close();
		input.close();
		return null;
	}