在jsp里上传图片很少用上述方式存储到数据库中，一般是将图片上传到服务器项目目录文件夹中，然后数据库中保存该图片文件的地址，如/item/upload/images/我上传的图片.jpg
servlet里面有一个request.getPart()方法，通过这个文件可以获得图片，前提是你的servlet版本必须是3.0以上+tomcat7，具体参考以下@WebServlet("/articleManage")
@MultipartConfig(maxFileSize = 1024 * 1024 * 10)
// 最大10MB
public class ArticleManage extends HttpServlet {
private static final long serialVersionUID = 1L
public ArticleManage() {
super()
}
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8")
doPost(request, response)
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String method = request.getParameter("method")
if (method != null) {
if (method.equals("add")) {
addArticle(request, response)
}
}
private void addArticle(HttpServletRequest request,
HttpServletResponse response) {
ArticleService service = new ArticleServiceImpl()
ArticleTypeService typeService=new ArticleTypeServiceImpl()
String content = null
String email = null
String tag = null
String type=null
try {
email = request.getParameter("email")
content = request.getParameter("content")
tag = request.getParameter("tag")
type=request.getParameter("type")
Part img = request.getPart("img")
String imgName = null
if (img != null) {
// 设置文件路径，写到硬盘
String head = img.getHeader("content-disposition")
int index = head.lastIndexOf("=") + 2
imgName = head.substring(index, head.length() - 1)// 上传文件时的文件名
imgName.lastIndexOf(".")
String suffix = imgName.substring(imgName.lastIndexOf("."))// 文件后缀
if (!suffix.equals(".jpeg") &&!suffix.equals(".jpg")
&&!suffix.equals(".png") &&!suffix.equals(".gif")
&&!suffix.equals(".bmp")) {
System.out.println("innn******************")
// 非法文件
request.setAttribute("content", content)
request.setAttribute("email", email)
request.setAttribute("tag", tag)
request.setAttribute("type", type)
request.setAttribute("errorinfo",
"*您上传的文件不合法，只能上后缀为jpg,bmp,png,gif,jpeg的图片")
request.getRequestDispatcher("add.jsp").forward(request,
response)// 重新导航到表单页
return
}
imgName = System.currentTimeMillis() + suffix
img.write(this.getServletContext().getRealPath("/image/upload")
+ File.separator + imgName)// 写到硬盘
}
Article msg = new Article()
msg.setContent(content)
msg.setImg("image/upload/" + imgName)
msg.setEmail(email)
msg.setKeyWord(tag)
msg.setType(typeService.querySingle(Integer.parseInt(type)))
// 从session中取User
User user = (User) request.getSession().getAttribute("user")
msg.setUser(user)
service.addMsg(msg)
response.setCharacterEncoding("utf-8")
response.setContentType("text/html")
response.getWriter()
.write("<html !DOCTYPE html><body><div style='marginautofont-weight:bold'><span style='font-size17px'>投稿成功</span>两秒后跳转到首页...</body></html>")
response.setHeader("refresh", "2url=index.jsp")
} catch (Exception e) {
e.printStackTrace()
request.setAttribute("content", content)
request.setAttribute("email", email)
request.setAttribute("tag", tag)
request.setAttribute("type", type)
request.setAttribute("errorinfo", "投稿失败,请检查上传文件的大小，不能大于10MB")
try {
request.getRequestDispatcher("add.jsp").forward(request,
response)
} catch (ServletException | IOException e1) {
e1.printStackTrace()
}
return
} finally {
try {
service.closeConnResources()
} catch (SQLException e) {
e.printStackTrace()
}
}
}
这是我前几天写的，有问题再问我
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