Struts2 上傳文件主要代碼

public File file; //與頁面上的 input file 標簽的name 一樣
 public String name;

/**

上傳文件公共方法
@param url 地址
@param ext 后綴名
@return 上傳成功
*/
public boolean file(String url,String ext) {
response = getResponse();
InputStream input = null;
long time = System.currentTimeMillis();
OutputStream os = null;
try {
System.out.println(name);
SystemParameter systemParameter = (SystemParameter) getRequest()
 .getSession().getServletContext()
 .getAttribute("systemParameter");
String path = systemParameter.getFilePath() + url ;
String houzui = name.substring(name.lastIndexOf("("), name.length());
if (houzui.equals("(空白)")) {
name=name.substring(0, name.indexOf("("));
}
if (name.equals("流程圖")) {
name="liuchen";
}
// 檢查文件是否存在
File f = new File(path, name+ ext);
if (f.exists()) {
System.out.println(f.getAbsolutePath());
System.out.println(f.getName());
String newName = path + name + "old_" + time

ext;

System.out.println(newName);
boolean is = f.renameTo(new File(newName));
if (is == false) {
 f.renameTo(new File(path + name + ext));
return false;
} else {
 // 如果存在，在讀一次改過文件的名字，如果新的名字不存在，就提示上傳失敗
 File file = new File(newName);
 if (!file.exists()) {
  return false;
 }
}
}
input = new FileInputStream(file);
os = new FileOutputStream(f);
byte[] by = new byte[1024];
int length = input.read(by);
while (length != -1) {
os.write(by, 0, length);
length = input.read(by);
}
return true;
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
} finally {
try {
if (input != null)
 input.close();
if (os != null)
 os.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}</pre>