java文件上传处理代码说明
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUpload;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.RequestContext;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.servlet.ServletRequestContext;
?
public class SaveToServer extends HttpServlet{
?public void doGet(HttpServletRequest request,HttpServletResponse response){
??this.doPost(request, response);
?}
?
?public void doPost(HttpServletRequest request, HttpServletResponse response)
?? throws ServletException, IOException {
????????request.setCharacterEncoding("utf-8");
? //这里对request进行封装，RequestContext提供了对request多个访问方法
? RequestContext requestContext = new ServletRequestContext(request);
? //判断表单是否是Multipart类型的。这里可以直接对request进行判断，不过已经以前的用法了
? if (FileUpload.isMultipartContent(requestContext)) {
?? DiskFileItemFactory factory = new DiskFileItemFactory();
??
?? // 设置文件的缓存路径
???
????? String path=request.getRealPath("/upload");//保存的默认路径,注意在Tomecate底下的
????? File? d = new File(path);
????? //或保存在D盘下的temp folder
??????//File d = new File("D:/temp");
????? if(!d.exists()){
?????? d.mkdirs();
????? }
?? factory.setRepository(d);
?? ServletFileUpload upload = new ServletFileUpload(factory);
?? //设置上传文件大小的上限，-1表示无上限
?? upload.setSizeMax(-1);
?? List items = new ArrayList();
?? try {
??? //上传文件，并解析出所有的表单字段，包括普通字段和文件字段
??? //注意item集合里面放的是提交的所有东西 包括username,password不仅仅是文件
??? items = upload.parseRequest(request);
?? } catch (FileUploadException e1) {
??? System.out.println("上传发生异常" + e1.getMessage());
?? }
??
?? //下面对每个字段进行处理，分普通字段和文件字段
?? Iterator it = items.iterator();
?? while (it.hasNext()) {
??? FileItem fileItem = (FileItem) it.next();
???
??? //如果是普通字段
??? if (fileItem.isFormField()) {//判断不是文件类型
???? System.out.println("文本框的name属性:"
?????? + fileItem.getFieldName() //取字段的名字
?????? + "\n文件名:"
?????? + fileItem.getName()
?????? + "\n上传的文件路径:"
?????? + new String(fileItem.getString().getBytes(
???????? "iso8859-1"), "utf-8"));
??? } else {//是文件类型
???? System.out.println("文本框的name属性:"
?????? + fileItem.getFieldName() + "\n文件名:"
?????? + fileItem.getName() + "\n是否在内存中:" //只适用于返回文件类型的名字
?????? + fileItem.isInMemory() + "\n文件类型:"
?????? + fileItem.getContentType() + "\n文件大小:"
?????? + fileItem.getSize());
????
???? //保存文件，其实就是把缓存里的数据写到目标路径下
???? if (fileItem.getName() != null && fileItem.getSize() != 0) {
????? File fullFile = new File(fileItem.getName());
????? File newFile = new File("D:\\upload"+ fullFile.getName());//想换成webroot下的upload路径。。。。。。。。。。。
????? try {
?????? fileItem.write(newFile);
????? } catch (Exception e) {
?????? e.printStackTrace();
????? }
???? } else {
????? System.out.println("文件没有选择 或 文件内容为空");
???? }
??? }
??
??? System.out.println("=============================================");
?? }
? }
}
?
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