用struts2实现的文件上传与下载

package action; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import javax.servlet.ServletContext; import org.apache.struts2.ServletActionContext; public class UploadAction { private File file; private String fileFileName; private String fileContentType; public String getFileContentType() { return fileContentType; } public void setFileContentType(String fileContentType) { this.fileContentType = fileContentType; } public String getFileFileName() { return fileFileName; } public void setFileFileName(String fileFileName) { this.fileFileName = fileFileName; } public File getFile() { return file; } public void setFile(File file) { this.file = file; } public String execute() throws Exception{ // if(file!=null) System.out.println("----------------"); // System.out.println(file.getName()); // System.out.println(file.getAbsolutePath()); // System.out.println(file.getCanonicalPath()); System.out.println("*****************"); System.out.println(fileFileName); System.out.println(fileContentType); BufferedInputStream bis=new BufferedInputStream(new FileInputStream(file)); //获得应用路径 ServletContext ctx=ServletActionContext.getServletContext(); System.out.println("realPath:"+ctx.getRealPath("upload")); File f=new File(ctx.getRealPath("upload"),fileFileName); BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream(f)); int b=-1; byte[] buffer=new byte[1024]; while((b=bis.read(buffer, 0, 1024))!=-1){ bos.write(buffer, 0, b); } if(bos!=null) bos.close(); if(bis!=null) bis.close(); return "success"; } }