servlet文件上傳2——復合表單提交（數據獲取和文件上傳）
阿新 • • 發佈：2017-08-14
import bmi util 3.2 utf false ons quest pat
上傳文件時表單enctype屬性必須要更改為<enctype=‘multipart/form-data‘>；采用post提交表單，元素需要有name屬性；
利用第三方jar包（commons-fileupload-1.2.1.jar commons-io-1.3.2.jar ）進行普通數據獲取和文件上傳；普通文本需要用getString（"編碼格式"）方法獲取，否則漢字會出現亂碼，最開始我一直用的getString（）獲取，發現傳到數據的數據全是亂碼，查看流浪器的裏面的請求和響應全是正常的，百度了半天也沒找到真正的解決方法，無意間發現第三方包裏面的FileItem還有一個重載的getString（String args）方法，但是不曉得參數傳什麽；後來發現這個getString（String args）方法會拋一個
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 {
//響應編碼格式
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();
//遍歷類型的集合，得到下拉框選項
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>");
//上傳文件的提交方式
out.println("<form action=‘AddResultServlet‘ method=‘post‘ enctype=‘multipart/form-data‘>");
out.println("<table>");
out.println("<tr>");
out.println("<td>名稱：</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>介紹：</td>");
out.println("<td><input type=‘text‘ name=‘jieshao‘></td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td>售價：</td>");
out.println("<td><input type=‘text‘ name=‘shoujia‘></td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td>分類：</td>");
out.println("<td>");
out.println("<select name=‘fenlei‘>");
//遍歷類型的集合，得到下拉框選項
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);
}
}
處理提交數據的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 {
//請求數據返回FileItem類型的數組
fileItems = upload.parseRequest(request);
} catch (FileUploadException e) {
e.printStackTrace();
}
//上傳的文件存放路徑
String path = getServletContext().getRealPath("/image");
File f = new File(path);
//沒有此路徑就創建
if(!f.exists()){
f.mkdirs();
}
//遍歷請求數據的集合進行數據的獲取和文件的上傳
for (FileItem x : fileItems) {
try {
uploading(x, goods, path);
} catch (Exception e) {
e.printStackTrace();
}
}
//普通數據存入數據庫，頁面跳轉
if(new GoodsService().add(goods)){
request.getRequestDispatcher("success.html").forward(request, response);
}else{
response.sendRedirect("lose.html");
}
}
/**
* 數據的獲取和文件上傳
* @param fileItem
* @param goods 待添加的商品
* @param path 上傳的路徑
* @throws Exception
*/
private void uploading (FileItem fileItem,Goods goods,String path) throws Exception{
//普通文本數據
//只能獲取字符串，其他的數據需要通過包裝類的方法轉化得到
if(fileItem.isFormField()){
if(fileItem.getFieldName().equals("mingzi")){
//獲取普通的文本數據利用getString("utf-8")，設置編碼格式。否則會出現漢字亂碼
goods.setName(fileItem.getString("utf-8"));
}else if(fileItem.getFieldName().equals("jieshao")){
goods.setExplain(fileItem.getString("utf-8"));
}else if(fileItem.getFieldName().equals("shoujia")){
//字符串轉Double
goods.setPrice(Double.parseDouble(fileItem.getString()));
}else if(fileItem.getFieldName().equals("fenlei")){
String type = fileItem.getString();
goods.setType(Integer.parseInt(type));
}
}else{
// 文件類型
String fileName = fileItem.getName();
// System.out.println(fileName);
//設置上傳的文件名字，利用時間返回毫秒數，保證上傳的文件不重名
String path1 = new Date().getTime()+"_"+fileName;
String fileName2= path+"\\"+ path1;
File file = new File(fileName2);
//數據只存放文件名字
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);
}
}
效果圖：
完整項目網盤地址：http://pan.baidu.com/s/1boWm05T 密碼：blqh
servlet文件上傳2——復合表單提交（數據獲取和文件上傳）