struts2的简单实例

package actions; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.InputStream; import com.opensymphony.xwork2.ActionSupport; public class UploadAction extends ActionSupport { private File upload; //封装上传文件域的属性 private String uploadContentType; //封装上传文件类型的属性 private String uploadFileName; //封装上传文件名的属性 private String filename; //封装上传文件新文件名的属性 private String uploadPath; //封装上传文件保存在服务器的路径,通过struts.xml中的参数设置 private String result; public File getUpload() { return upload; } public void setUpload(File upload) { this.upload = upload; } public String getUploadContentType() { return uploadContentType; } public void setUploadContentType(String uploadContentType) { this.uploadContentType = uploadContentType; } public String getUploadFileName() { return uploadFileName; } public void setUploadFileName(String uploadFileName) { this.uploadFileName = uploadFileName; } public String getFilename() { return filename; } public void setFilename(String filename) { this.filename = filename; } public String getUploadPath() { return uploadPath; } public void setUploadPath(String uploadPath) { this.uploadPath = uploadPath; } public String getResult() { return result; } public void setResult(String result) { this.result = result; } /** * @return */ public String execute() throws Exception{ String fn = ""; //如果新文件名未输入，则使用上传文件的文件名作为服务器保存的文件名 if(filename.equals("")){ fn = uploadPath + uploadFileName; } else{ fn = uploadPath + filename; } // 如果服务器存在同名的文件，则输出提示信息 if(new File(fn).exists()){ result = "该文件已经存在，请为文件指定一个新的文件名"; } else{ FileOutputStream fos = new FileOutputStream(fn); InputStream is = new FileInputStream(upload); byte[] buffer = new byte[8192]; //每次读8K字节 int count = 0; while((count = is.read(buffer)) > 0){ fos.write(buffer, 0, count); } fos.close(); is.close(); result = "文件上传成功"; } return "result"; } }