java上传本地图片到工程目录
java编程，编写一个前端页面，设置一个功能：选择一张本地图片或者视频，然后上传到项目工程创建的一个目录下。但是每次我在前端选了文件，点击上传，到了后端那里，就只剩下一个文件名称了。这个该怎么实现，请教各位大佬指点一二。
文件上传现在有很多插件可以实现。前段时间刚做了一个文件上传，采用的是JSP+Servlet完成上传，用的fileupload插件。我这个同时将文件信息存到了数据库，存数据库的就就注册信息一致。附上源码，希望能够帮助到你。
public class addNewBookServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
// 上传文件存储目录
private static final String UPLOAD_DIRECTORY = "upload";
// 上传配置
private static final int MEMORY_THRESHOLD = 1024 * 1024 * 3; // 3MB
private static final int MAX_FILE_SIZE = 1024 * 1024 * 40; // 40MB
private static final int MAX_REQUEST_SIZE = 1024 * 1024 * 50; // 50MB
/**
* @see HttpServlet#HttpServlet()
*/
public addNewBookServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
if (!ServletFileUpload.isMultipartContent(request)) {
// 如果不是则停止
PrintWriter writer = response.getWriter();
writer.println("Error: 表单必须包含 enctype=multipart/form-data");
writer.flush();
return;
}
response.setContentType("text/html;charset=utf-8");
PrintWriter writer=response.getWriter();
StringBuffer fileStr=new StringBuffer(); //上传的文件名，最后输出用
// 配置上传参数
DiskFileItemFactory factory = new DiskFileItemFactory();
// 设置内存临界值 - 超过后将产生临时文件并存储于临时目录中
factory.setSizeThreshold(MEMORY_THRESHOLD);
// 设置临时存储目录
factory.setRepository(new File(System.getProperty(")));
ServletFileUpload upload = new ServletFileUpload(factory);
// 设置最大文件上传值
upload.setFileSizeMax(MAX_FILE_SIZE);
// 设置最大请求值 (包含文件和表单数据)
upload.setSizeMax(MAX_REQUEST_SIZE);
// 中文处理
upload.setHeaderEncoding("UTF-8");
// 构造临时路径来存储上传的文件
// 这个路径相对当前应用的目录
String uploadPath = LM.toChinese(request.getServletContext().getRealPath("") + LM.toChinese(File.separator + UPLOAD_DIRECTORY));
// 如果目录不存在则创建
File uploadDir = new File(uploadPath);
if (!uploadDir.exists()) {
uploadDir.mkdir();
}
try {
// 解析请求的内容提取文件数据
List<FileItem> formItems = upload.parseRequest(new ServletRequestContext(request));
if (formItems != null && formItems.size() > 0) {
// 迭代表单数据
for (FileItem item : formItems) {
// 处理不在表单中的字段
if (!item.isFormField()) {
String fileName = new File(item.getName()).getName();
String filePath = uploadPath + File.separator + fileName;
String bookname="";
String bookwriter="";
String bookprice="";
Book_message book=new Book_message();
BookImple bookim=new BookImple();
NowTime time=new NowTime();
String ts=time.getDate();
File storeFile = new File(filePath);
HttpSession session=request.getSession();
//String fieldName=item.getFieldName();
Iterator<FileItem> iterator=formItems.iterator();
while(iterator.hasNext()){
FileItem FileItem=iterator.next();
if(FileItem.getFieldName().equals("bookname")){
bookname=LM.toChinese(FileItem.getString());
session.setAttribute("bookname", bookname);
System.out.println("添加书籍名称为："+bookname);
}else if(FileItem.getFieldName().equals("bookwriter")){
bookwriter=LM.toChinese(FileItem.getString());
System.out.println("添加数据作者为："+bookwriter);
session.setAttribute("bookwriter", bookwriter);
}else if(FileItem.getFieldName().equals("bookprice")){
bookprice=FileItem.getString();
}
}
book=bookim.addNewBook(bookname, bookwriter, bookprice,filePath,ts);
// 在控制台输出文件的上传路径
System.out.println(filePath);
System.out.println("文件上传成功");
// 保存文件到硬盘
item.write(storeFile);
request.setAttribute("message","文件上传成功!");
}
}
}
} catch (Exception ex) {
request.setAttribute("message","错误信息: " + ex.getMessage());
}
// 跳转到 message.jsp
request.getServletContext().getRequestDispatcher("/showaddbookmessage").forward(request, response);
}
}
