由于项目需求在上传头像是需要使用异步上传文件，在上传的过程中需要对文件进行校验：规则如下：宽度和高 度大于200，宽高比要小于2，大小小于2M。
我这里使用的是
AjaxFileUploader
这个组件，服务器使用Struts处理文件。实例：
这里需要引入两个js文件：jQuery、ajaxfileUpload
js文件：
后台处理程序：UploadPhotoAction.Java
return userPhoto;
}
public void setUserPhoto(File userPhoto) {
this.userPhoto = userPhoto;
}
public String getUserPhotoContentType() {
return userPhotoContentType;
}
public void setUserPhotoContentType(String userPhotoContentType) {
this.userPhotoContentType = userPhotoContentType;
}
public String getUserPhotoFileName() {
return userPhotoFileName;
}
public void setUserPhotoFileName(String userPhotoFileName) {
this.userPhotoFileName = userPhotoFileName;
}
/**
-
用户上传图像
*/
public void uploadPhoto(){
try {
HttpServletResponse response = (HttpServletResponse) ActionContext.getContext().get(ServletActionContext.HTTP_RESPONSE);
response.setCharacterEncoding("UTF-8");FileInputStream fis1 = new FileInputStream(getUserPhoto()); //保存文件
FileInputStream fis2 = new FileInputStream(getUserPhoto()); //判断文件
int i = this.checkImage(fis2);
if(i==1){
response.getWriter().print("1");
}
else if(i==2){
response.getWriter().print("2");
}
else if(i==3){
response.getWriter().print("3");
}
else { //文件正确、上传
//得到文件名
String photoName = getPhotoName(getUserPhotoFileName());FileOutputStream fos = new FileOutputStream(getSavePath()+"\"+photoName);
byte[] buffer = new byte[1024];
int len = 0;
while ((len = fis1.read(buffer))>0) {
fos.write(buffer,len);
}
//处理文件路径,便于在前台显示
String imagPathString = dealPath(getSavePath()+"\"+photoName);
response.getWriter().print(imagPathString);}
}
catch (IOException e) {
e.printstacktrace();
}
}
/**
- 重新命名头像名称:用户编号+头像后缀
*/
public String getPhotoName(String photoName){
//获取用户
HttpServletRequest request = (HttpServletRequest) ActionContext.getContext().get(ServletActionContext.HTTP_Request);
UserBean userBean = (UserBean) request.getSession().getAttribute("userBean");
//<a href="https://www.jb51.cc/tag/huoqu/" target="_blank" class="keywords">获取</a><a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>的后缀
String[] strings = photoName.split("\\.");
String hz = strings[1];
//构建<a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>名
String fileName = userBean.getUserId()+"."+hz;
return fileName; }
/**
- 获取上传路径
*/
public String getSavePath(){
return ServletActionContext.getServletContext().getRealPath("upload/photos");
}
/**
- 判断上传的头像是否合法
- 规则：宽度和高度大于200、宽高比小于2、大小小于2M
- 宽度或者高度<200 返回1
- 宽高比>2 返回2
- 大小大于2M 返回 3
- 正确 返回 0
/
public int checkImage(FileInputStream fis){
try {
BufferedImage image = ImageIO.read(fis);
double width = image.getWidth();
double height = image.getHeight();
if(width<200||height<200){
return 1;
}
else if(width/height>2){
return 2;
}
else if(fis.available()/(10241024)>2){
return 3;
}
else {
return 0;
}
} catch (IOException e) {
e.printstacktrace();
}
return 1;
}
/**
- 处理头像路径
*/
public String dealPath(String path){
String[] strings = path.split("\\");
String string2 = "/";
for (int i = strings.length-4; i < strings.length; i++) {
if(i==strings.length-1){
string2 = string2+strings[i];
}
else {
string2 = string2+strings[i]+"/";
}
}
return string2; }
}
