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servlet文件上传2——复合表单提交(数据获取和文件上传)

时间:2017-08-14 20:13:23      阅读:300      评论:0      收藏:0      [点我收藏+]

标签:time   vax   技术分享   单词   bean   nts   格式   dispatch   logs   

上传文件时表单enctype属性必须要更改为<enctype=‘multipart/form-data‘>;采用post提交表单,元素需要有name属性;

利用第三方jar包(commons-fileupload-1.2.1.jar   commons-io-1.3.2.jar )进行普通数据获取和文件上传;普通文本需要用getString("编码格式")方法获取,否则汉字会出现乱码,最开始我一直用的getString()获取,发现传到数据的数据全是乱码,查看流浪器的里面的请求和响应全是正常的,百度了半天也没找到真正的解决方法,无意间发现第三方包里面的FileItem还有一个重载的getString(String  args)方法,但是不晓得参数传什么;后来发现这个getString(String  args)方法会抛一个

UnsupportedEncodingException异常,英语也不好,百度单词的意思吧,什么不支持的编码异常,到此终于发现这个是设置编码的方法;
所以呢,写方法;写类;写变量;写参数时,能让人见文知意是多么重要;要是这个方法直接这样写的getString(String  charset)一看就知道是设置编码格式的方法了把。

 

添加商品的Servlet:

package ni.jun.yang.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import ni.jun.yang.service.KindService;


@WebServlet("/AddGoodsServlet")
public class AddGoodsServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;       
    
    public AddGoodsServlet() {      
    }

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		//响应编码格式
		response.setCharacterEncoding("utf-8");		
		PrintWriter out = response.getWriter();
		//遍历类型的集合,得到下拉框选项
		List<String> list = new ArrayList<>();
		String sql = "Select * from kind";
		list = new KindService().select(sql);
		out.println("<html><head><meta charset=‘utf-8‘><title>添加商品</title>");
		out.println("</head>");
		out.println("<body>");
		//上传文件的提交方式
		out.println("<form action=‘AddResultServlet‘ method=‘post‘ enctype=‘multipart/form-data‘>");
		out.println("<table>");
		
		out.println("<tr>");
		out.println("<td>名称:</td>");
		out.println("<td><input type=‘text‘ name=‘mingzi‘></td>");
		out.println("</tr>");
		
		out.println("<tr>");
		out.println("<td></td>");
		out.println("<td><input type=‘file‘ name=‘filename‘></td>");
		out.println("</tr>");
		
		out.println("<tr>");
		out.println("<td>介绍:</td>");
		out.println("<td><input type=‘text‘ name=‘jieshao‘></td>");
		out.println("</tr>");
		
		out.println("<tr>");
		out.println("<td>售价:</td>");
		out.println("<td><input type=‘text‘ name=‘shoujia‘></td>");
		out.println("</tr>");
		
		out.println("<tr>");
		out.println("<td>分类:</td>");
		out.println("<td>");
		out.println("<select name=‘fenlei‘>");
		//遍历类型的集合,得到下拉框选项
		for (int i = 0;i<list.size();i++) {
			out.println("<option value="+(i+1)+">");
			out.println(list.get(i));
			out.println("</option>");
		}
		out.println("</select>");
		out.println("</td>");
		out.println("</tr>");
		
		out.println("<tr>");
		out.println("<td> </td>");
		out.println("<td><input type=‘submit‘ value=‘添加‘></td>");
		out.println("</tr>");
		out.println("</table>");
		out.println("</form>");
		out.println("</body>");
		out.println("</html>");
		
	}	
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {		
		doGet(request, response);
	}
}

  处理提交数据的Servlet:

package ni.jun.yang.servlet;

import java.io.File;
import java.io.IOException;
import java.util.Date;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
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.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import ni.jun.yang.bean.Goods;
import ni.jun.yang.service.GoodsService;


@WebServlet("/AddResultServlet")
public class AddResultServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    public AddResultServlet() {
        
    }	
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");

		DiskFileItemFactory factory = new DiskFileItemFactory();
		factory.setSizeThreshold(1024*1024*5);
		ServletFileUpload upload = new ServletFileUpload(factory);
		List<FileItem> fileItems = null;
		Goods goods = new Goods();
		try {
			//请求数据返回FileItem类型的数组
			 fileItems = upload.parseRequest(request);
		} catch (FileUploadException e) {
			
			e.printStackTrace();
		}
		//上传的文件存放路径
		String path = getServletContext().getRealPath("/image");
		File f = new File(path);
		//没有此路径就创建
		if(!f.exists()){
			f.mkdirs();
        }
		//遍历请求数据的集合进行数据的获取和文件的上传
		for (FileItem x : fileItems) {
        	try {
				uploading(x, goods, path);
			} catch (Exception e) {
				
				e.printStackTrace();
			}
        }
		//普通数据存入数据库,页面跳转
		if(new GoodsService().add(goods)){
			request.getRequestDispatcher("success.html").forward(request, response);
		}else{
			response.sendRedirect("lose.html");
		}
		
	}
	/**
	 * 数据的获取和文件上传
	 * @param fileItem   
	 * @param goods			待添加的商品
	 * @param path			上传的路径
	 * @throws Exception
	 */
	private void uploading (FileItem fileItem,Goods goods,String path) throws Exception{
		//普通文本数据    
		//只能获取字符串,其他的数据需要通过包装类的方法转化得到
		if(fileItem.isFormField()){
			if(fileItem.getFieldName().equals("mingzi")){
				//获取普通的文本数据利用getString("utf-8"),设置编码格式。否则会出现汉字乱码
				goods.setName(fileItem.getString("utf-8"));
				
			}else if(fileItem.getFieldName().equals("jieshao")){
				goods.setExplain(fileItem.getString("utf-8"));

			}else if(fileItem.getFieldName().equals("shoujia")){
				//字符串转Double
				goods.setPrice(Double.parseDouble(fileItem.getString()));

			}else if(fileItem.getFieldName().equals("fenlei")){
				String type = fileItem.getString();
				goods.setType(Integer.parseInt(type));

			}
		}else{
			// 文件类型
			String fileName = fileItem.getName();
//			System.out.println(fileName);
			//设置上传的文件名字,利用时间返回毫秒数,保证上传的文件不重名
			String path1 = new Date().getTime()+"_"+fileName;
			String fileName2= path+"\\"+ path1;
			File file = new File(fileName2);
			//数据只存放文件名字
			goods.setPhoto(path1);
//			System.out.println(fileName2);
			try {
				fileItem.write(file);
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
	
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		doGet(request, response);
	}

}

  效果图:

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 完整项目网盘地址:http://pan.baidu.com/s/1boWm05T         密码:blqh 

servlet文件上传2——复合表单提交(数据获取和文件上传)

标签:time   vax   技术分享   单词   bean   nts   格式   dispatch   logs   

原文地址:http://www.cnblogs.com/nijunyang/p/7359608.html

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