文件上传小例子:
问题:
前提:response.setContentType(“text/html;charset=UTF-8”);
request.setCharacterEncoding(“UTF-8”);
利用servletFileUpload.parseRequest(request)解析了之后,输出的普通表单项的值有中文乱码问题。
解决方法:
fileItem.getString(“UTF-8”):注意UTF-8的问题
public class UploadServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
request.setCharacterEncoding("UTF-8");
// 创建工厂
DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory();
// 创建解析器
ServletFileUpload servletFileUpload = new ServletFileUpload(diskFileItemFactory);
try {
// 解析request,包含普通表单项和文件表单项
List<FileItem> fileItems = servletFileUpload.parseRequest(request);
for (FileItem fileItem : fileItems) {
// isFormField()判断是否为普通表单项
if (fileItem.isFormField()) {
// getFieldName()获取表单名
String fieldName = fileItem.getFieldName();
if (fieldName.equals("username")) {
// 获取表单项的value,注意"UTF-8"
fileItem.getString("UTF-8");
response.getWriter().print("用户名:" + fileItem.getString("UTF-8") + "<br/>");
}
} else {
String fieldName = fileItem.getFieldName();
// 获取文件表单项的文件名getName()
String fileName = fileItem.getName();
if (fileName == null || fileName.isEmpty()) {
// 说明没有上传文件,处理...
}
String savePath = this.getServletContext().getRealPath("/WEB-INF/uploads");
File file = new File(savePath, fileName);
// 上传文件到服务器
fileItem.write(file);
response.getWriter().print("表单名:" + fieldName + "文件名:" + fileName + "<br/>");
response.getWriter().print("文件大小: " + fileItem.getSize() + "<br/>");
response.getWriter().print("文件类型: " + fileItem.getContentType() + "<br/>");
}
}
} catch (FileUploadException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
}