Struts上传图片到数据库并显示到页面的详细步骤.docVIP

Struts2实现文件上传，并显示。第一、实现JSP $html_title 监测点位注册 监测点编号:* 监测点名称:* 监测点类型:* 监测类型:* 监测点经度:* 监测点纬度:* 监测点照片: 监测点描述: 400) this.value=this.value.substr(0,400) 第二、Action具体实现 Action内添加如下字段。 private File upload; private String uploadContentType; private String uploadFileName;/接受依赖注入的属性 private String savePath;/接受依赖注入的方法 public void setSavePath(String value) this.savePath = value; / private String getSavePath() throws Exception / return ServletActionContext.getRequest().getRealPath(savePath);/ public void setUpload(File upload) this.upload = upload; public void setUploadContentType(String uploadContentType) this.uploadContentType = uploadContentType; public void setUploadFileName(String uploadFileName) this.uploadFileName = uploadFileName; public File getUpload() return (this.upload); public String getUploadContentType() return (this.uploadContentType); public String getUploadFileName() return (this.uploadFileName); 将流存入数据库 BeanUtils.populate(uis, BeanUtils.describe(userinfo); uis.setRqDate(new java.util.Date();/ System.out.println(sdfdsfdsfdsfs:+uis.getRqImage().toString();/ System.out.println(sdfdsfdsfdsfs:+userinfo.getUpload(); if(userinfo.getUpload()!=null) /设置图片 FileInputStream fis = new FileInputStream(userinfo.getUpload(); byte buffer = new bytefis.available(); fis.read(buffer); uis.setRqImage(buffer);/ byte s =uis.getRqImage();/ for(int i=0; is.length; i+)/ System.out.print(si);/ if(userinfo.getRadializationQualityService().save(uis)!=null) userinfo.setInfoStr(监测点注册成功!,index.action?action=/manager/county_user/stakeout_dot_manage/stakeout_manage); return succeed; else userinfo.setInfoStr(监测点注册失败,index.action?action=/manager/county_user/stakeout_dot_manage/stakeout_manage); return error; 第三、从数据库中读出图片public String showStakeout(StakeoutAction userinfo) System.out.println(UserInfoCounty showStakeout); try AbstractRadializationQuality ui = userinfo.getRadializationQualityService().findById(userinfo.getId(); if(ui=null) userinfo.setInfoStr(没找到你选择监测点!,userInfoCounty_searchStakeout.action); return error; /BeanUtils.populate(userinfo, BeanUtils.describe(ui); BeanUtils.copyProperties(userinfo,ui); userinfo.setRqDate(ui.getRqDate();/这里将图片流存入Sessionuserinfo.getSession().put(SES_StakeoutImage, userinfo.getRqImage(); /设置显示 用户信息 AbstractUserInfo au = (AbstractUserInfo)userinfo.getUserInfoService().findUserInfoId(ui.getRqUser(); if(au!=null) userinfo.setShowUserName(au.getUiName(); userinfo.setShowUiId(au.getUiId(); return /manager/county_user/stakeout_dot_manage/stakeout_show; catch(Exception e) e.printStackTrace(); userinfo.setInfoStr(系统错误请联系管理员!,userInfoCounty_searchStakeout.action); return error; 第四、Servlet从Session中读出图片package com.radialization.servlet;import java.io.IOException;import javax.servlet.ServletConfig;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class StakeoutImage extends HttpServlet private static final long serialVersionUID = -7862035188698463539L;public void init(ServletConfig conf) throws ServletException super.init(conf);public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException byte image = (byte)req.getSession().getAttribute(SES_StakeoutImage); java.io.OutputStream out = null; byte bytes = null; if(image!=null) java.io.ByteArrayInputStream bi = new java.io.ByteArrayInputStream(image); /二进制输出流 res.setContentType( multipart/form-data ); /得到输出流 out = res.getOutputStream(); /从输入流读取数据到输出流 bytes = new byte 1024 ; while ( -1 != bi.read( bytes ) ) out.write( bytes ); /强制刷新输出流 out.flush(); public void doPost(HttpServletRequest req, HttpSer