javaSpringMVC上传文件（图片、文档、视频）及在线浏览
servlet上传文件：https://blog.csdn.net/baidu_35468322/article/details/88871675
上传（jsp）：
上传（controller）：
/**
* 添加
* @param file
* @param request
* @return
* @throws Exception
*/
@RequestMapping(value="/saveCK")
public ModelAndView saveCK(@RequestParam MultipartFile file,HttpServletRequest request) throws Exception{
if(!Jurisdiction.buttonJurisdiction(ckUrl, "save")){return null;} //校验权限
ModelAndView mv = this.getModelAndView();
PageData pd = new PageData();
pd=this.getPageData();
pd.put("CK_ID", this.get32UUID());
pd.put("TP_ID", request.getParameter("tp_id"));
pd.put("CK_TITLE", request.getParameter("ck_title"));
pd.put("CK_BLURB", request.getParameter("ck_blurb"));
pd.put("CK_ATTACH_TYPE", request.getParameter("ck_attach_type"));
//图片、视频、文档的路径
String url="";
// 文件保存路径
if("0".equals(pd.getString("CK_ATTACH_TYPE"))){
//图片
url = "/images/";
}else if("1".equals(pd.getString("CK_ATTACH_TYPE"))){
//视频
url = "/video/";
}else if("2".equals(pd.getString("CK_ATTACH_TYPE"))){
//文档
url = "/document/";
}
pd.put("CK_BELONG", request.getParameter("ck_belong")); //0--案例知识 1--教学素材
//获取当前登录人
HttpSession session = getRequest().getSession();
User user = (User)session.getAttribute(Const.SESSION_USER);
//如果是学生则添加的时候为无 如果是老师 则显示老师name
//通过用户Id获取角色Id 从而得出角色名称
pd.put("ROLE_ID", user.getROLE_ID());
if(roleService.findObjectById(pd).getString("ROLE_NAME").equals("学生")){
pd.put("USER_ID", "");
pd.put("AUDIT_TIME", "无");
pd.put("AUDIT_STATE", "2"); //还要判断 如果是学生则需要审核 如果是老师 则不需要审核
}else{
pd.put("USER_ID", user.getUSER_ID());
pd.put("AUDIT_TIME", ContractController.getTime());
pd.put("AUDIT_STATE", "0"); //还要判断 如果是学生则需要审核 如果是老师 则不需要审核
}
pd.put("CK_STATE", request.getParameter("ck_state"));
if("".equals(request.getParameter("remarks"))){
pd.put("REMARKS", "无");
}else{
pd.put("REMARKS", request.getParameter("remarks"));
}
pd.put("CREATE_BY", user.getNAME());
pd.put("CREATION_DATE", ContractController.getTime());
pd.put("LAST_UPDATE_DATE", ContractController.getTime());
pd.put("TEMP1", "");
pd.put("TEMP2", "");
pd.put("TEMP3", "");
System.out.println("pd-->"+pd);
//获取文件名
String fileName = file.getOriginalFilename();
//文件扩展名
String extName = fileName.substring(fileName.lastIndexOf("."));
String newName = this.get32UUID()+extName;
System.out.println("file.getOriginalFilename()"+file.getOriginalFilename());
pd.put("CK_ATTACH_PATH", "knowledge/"+url+newName);
// 判断文件是否为空
if (!file.isEmpty()) {
try {
String filePath = request.getSession().getServletContext().getRealPath("uploadFiles/knowledge")+url+newName;
System.out.println("filePath-->"+filePath);
// 转存文件
file.transferTo(new File(filePath));
} catch (Exception e) {
e.printStackTrace();
}
}
caseKnowledgeService.saveCK(pd);
mv.addObject("CK_BELONG", request.getParameter("ck_belong"));
mv.addObject("msg","success");
mv.setViewName("save_result");
//mv.setViewName("redirect:list.do?CK_BELONG="+request.getParameter("ck_belong"));
return mv;
}删除：
/**
* 删除
* @return
* @throws Exception
*/
@RequestMapping(value="/deleteCK")
public ModelAndView deleteCK(HttpServletRequest request) throws Exception{
if(!Jurisdiction.buttonJurisdiction(ckUrl, "del")){return null;} //校验权限
ModelAndView mv=this.getModelAndView();
PageData pd=this.getPageData();
PageData caseKnow = caseKnowledgeService.findById(pd);
//System.out.println("**********"+request.getSession().getServletContext().getRealPath("uploadFiles/"+caseKnow.getString("CK_ATTACH_PATH")));
File file = new File(request.getSession().getServletContext().getRealPath("uploadFiles/"+caseKnow.getString("CK_ATTACH_PATH")));
if (!file.isDirectory()) {//如果文件没有被销毁，则删除
file.delete();
}
caseKnowledgeService.deleteCK(pd);
mv.addObject("msg","success");
mv.addObject("CK_BELONG", pd.getString("CK_BELONG"));
mv.setViewName("save_result");
return mv;
}在线预览（controller）：
/**
* 查看附件
* @return
* @throws Exception
*/
@RequestMapping(value="/view")
public ModelAndView view(HttpServletRequest request) throws Exception{
if(!Jurisdiction.buttonJurisdiction(ckUrl, "cha")){return null;} //校验权限
ModelAndView mv = this.getModelAndView();
PageData pd = new PageData();
pd = this.getPageData();
System.out.println("pd-->"+pd);
pd=caseKnowledgeService.findById(pd);
//判断路径是否存在
File file = new File(request.getSession().getServletContext().getRealPath("uploadFiles/"+pd.getString("CK_ATTACH_PATH")));
if(!file.exists()) { //如果不存在
pd.put("path", "hasnotPath");
}
mv.addObject("pd", pd);
mv.setViewName("knowledge/caseKnowledge/ck_view");
return mv;
}在线预览（jsp）：
文件找不到了！