文件上传和ajax获取json的小示例

package com.hustner.controllers; import java.io.*; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Random; import javax.servlet.http.HttpServletResponse; import net.sf.json.JSON; import net.sf.json.JSONObject; import org.apache.commons.io.FileUtils; import org.apache.struts2.ServletActionContext; import com.hustner.entity.User; import com.hustner.service.UserService; public class UserAction { private String name; private int sex; private String phone; private File header; private String headerFileName; private UserService userService; private Random random; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getSex() { return sex; } public void setSex(int sex) { this.sex = sex; } public String getPhone() { return phone; } public void setPhone(String phone) { this.phone = phone; } public File getHeader() { return header; } public void setHeader(File header) { this.header = header; } public String getHeaderFileName() { return headerFileName; } public void setHeaderFileName(String headerFileName) { this.headerFileName = headerFileName; } public UserService getUserService() { return userService; } public void setUserService(UserService userService) { this.userService = userService; } public String register(){ String ext = headerFileName.substring(headerFileName.lastIndexOf(".")); if(random==null) random = new Random(System.currentTimeMillis()); String fname=random.nextDouble()+""; fname=fname.substring(fname.indexOf(".")+1)+ext; //保存路径 String path=ServletActionContext.getRequest().getRealPath("")+"\\images\\header\\"+fname; File destFile = new File(path); try { FileUtils.copyFile(header, destFile); User user = new User(name, sex, phone, fname); if(userService.addUser(user)==null) throw new Exception(); ServletActionContext.getRequest().getSession(true).setAttribute("user", user); return "success"; } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); ServletActionContext.getRequest().setAttribute("msg", "保存头像图片出错"); }catch(Exception e){ e.printStackTrace(); ServletActionContext.getRequest().setAttribute("msg", "增加用户信息"); } return "input"; } public String reg(){ ///获取到uuuuuu.jpg中的.jpg String end=headerFileName.substring(headerFileName.indexOf(".")); if(random==null) random=new Random(System.currentTimeMillis()); String fname=random.nextDouble()+""; //保存在数据库的路径 fname=fname.substring(fname.lastIndexOf(".")+1)+end; //保存图片的路径 String path=ServletActionContext.getServletContext().getRealPath("")+"\\images\\header\\"+fname; File file=new File(path); try { FileUtils.copyFile(header, file); User user=new User(name, sex, phone, fname); if(userService.addUser(user)==null){ throw new Exception(); } ServletActionContext.getRequest().getSession(true).setAttribute("user", user); return "success"; } catch (IOException e) { e.printStackTrace(); ServletActionContext.getRequest().setAttribute("msg", "保存头像图片出错"); } catch (Exception e) { e.printStackTrace(); ServletActionContext.getRequest().setAttribute("msg", "增加用户出错"); } /* System.out.println(path); System.out.println(fname); System.out.println(end);*/ return "input"; } public String selectuser(){ System.out.println("执行到了么"); Map<String, Object> request=(Map<String, Object>)ServletActionContext.getContext().get("request"); List<User> users=userService.selectallUser(); System.out.println(users.toString()); if(users==null){ request.put("msg", "加载过程出错"); } request.put("users", users); request.put("count", users.size()); return "success"; } public String selectuser2 () throws IOException{ System.out.println("执行到了么"); Map<String, Object> request=(Map<String, Object>)ServletActionContext.getContext().get("request"); HttpServletResponse response = ServletActionContext.getResponse(); List<User> users=userService.selectallUser(); response.setContentType("text/html"); response.setCharacterEncoding("utf-8"); //创建json的对象 JSONObject json=new JSONObject(); //把对象users累积到key中。也就是相当于在后面添加功能。 json.accumulate("users", users); PrintWriter out = response.getWriter(); //out.println(array.toString()); //把json返回给页面 out.println(json.toString()); for(User user:users){ System.out.println(user.toString()); } System.out.println(json.toString()); //out.println(array.toString()); //输出集合的属性(List,Map) //out.println(json.toString()); //输出一个对象的属性 out.flush(); out.close(); return "success"; } }