將圖片上傳
1.添加使用jar包， jspSmartUpload.jar，並導包；
2.創建jsp頁面，注意必須是“post”方式提交，form標籤中一定要添加enctype=”multipart/form-data”
<body>
<form action="<%=request.getContextPath()%>/UpServlet" method="post" enctype="multipart/form-data">
<p><input type="file" name="file1"></p>
<p><input type="file" name="file2"></p>
<p><input type="file" name="file3"></p>
<p><input type="file" name="file4"></p>
<p><input type="submit" value="上傳"></p>
</form>
</body>3.添加servlet
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1）創建SmartUpload對象，
SmartUpload su=new SmartUpload();
//以及初始化initialize(getServletConfig(), request, response);
su.initialize(getServletConfig(), request, response);
//2）設置上傳限制（文件的大小，類型）
su.setMaxFileSize(1024*1024*9);
su.setAllowedFilesList("jpg,png,gif");
//3）調用SmartUpload對象的 upload()
try {
su.upload();
} catch (SmartUploadException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//4）設置上傳路徑
String path=this.getServletContext().getRealPath("images");
File file=new File(path);
if(!file.exists()) {
file.mkdir();//創建文件夾
}
//5）讀取上傳文件的個數，開始單個文件的主傳
int count=su.getFiles().getCount();
List<String> urls=new ArrayList<>();
for (int i = 0; i < count; i++) {
/*5.1）讀取本次上傳的文件
5.2）判斷文件的大小，如果爲0則越過
5.3）改文件名
5.4）調用文件對象的 saveAs()方法
5.5）數據庫處理*/
com.jspsmart.upload.File file1=su.getFiles().getFile(i);
if(file1.getSize()==0) {
continue;
}
String filename=file1.getFileName();
try {
file1.saveAs(path+"/"+filename);
urls.add("images/"+filename);//要添加相對路徑
} catch (SmartUploadException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
request.setAttribute("urls", urls);
request.getRequestDispatcher("success.jsp").forward(request, response);
//6）修改跳轉路徑 結束
//7）處理異常，完成跳轉
}跳轉至success.jsp中顯示
<body>
<c:forEach items="${urls }" var="url">
<img alt="" src="${url }"><br>
</c:forEach>
</body>關於下載
在WebContent中建個文件夾，裏面存放要下載的內容
jsp頁面
<body>
<a href="<%=request.getContextPath()%>/DownServlet">下載</a>
</body>servlet
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
/*創建SmartUpload對象，初始化
獲得文件路徑
su.setContentDisposition(null);
調用下載方法downloadFile(下載的文件的路徑);*/
SmartUpload su=new SmartUpload();
su.initialize(getServletConfig(), request, response);
String path=this.getServletContext().getRealPath("down/[Java參考文檔]JDK_API_1_6_zh_CN.CHM");
su.setContentDisposition(null);//禁止在瀏覽器中打開
try {
su.downloadFile(path);
} catch (SmartUploadException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}