Java 在struts 2.3中上载之前预览图像
我想使用struts2上传数据库中的文件,但问题是我想在同一页面上选择照片时显示照片 图像将显示程序的这些部分 index.jspJava 在struts 2.3中上载之前预览图像,java,mysql,struts2,Java,Mysql,Struts2,我想使用struts2上传数据库中的文件,但问题是我想在同一页面上选择照片时显示照片 图像将显示程序的这些部分 index.jsp <s:form action="UploadAction.action" enctype="multipart/form-data"> <s:textfield name="ename" required="true" label="Emp Name" /> <s:file name="photo" label="
<s:form action="UploadAction.action" enctype="multipart/form-data">
<s:textfield name="ename" required="true" label="Emp Name" />
<s:file name="photo" label="Photo" required="true" />
<s:submit value="U P L O A D" />
</s:form>
Photo.java
public class Photo extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String empno = request.getParameter("e");
try {
ResultSet rs = com.db.Admin.getPhoto(empno);
if (rs.next()) {
Blob ph = (Blob) rs.getBlob(1);
byte data[] = ph.getBytes(1, (int) ph.length());
ServletOutputStream out = response.getOutputStream();
out.write(data);
}
} catch (Exception e) {
e.getMessage();
}
}
}
Admin.java
public static String addemp(String ename, String photo) {
try {
CallableStatement cs = connect().prepareCall("{call addEmp(?,?,?)}");
cs.setString(1, ename);
FileInputStream r = new FileInputStream(photo);
cs.setBinaryStream(2, r);
cs.registerOutParameter(3, Types.VARCHAR);
cs.execute();
return cs.getString(3);
} catch (Exception e) {
return e.getMessage();
}
}
public static ResultSet getData() throws Exception {
return connect().prepareCall("{call getData()}").executeQuery();
}
public static ResultSet getPhoto(String empno) throws Exception {
CallableStatement cs = connect().prepareCall("{call getPhoto(?)}");
cs.setString(1, empno);
return cs.executeQuery();
}
}这应该通过一些javascript代码来完成
<img id="imagePlaceHolder" alt="your image" width="100" height="100" />
<s:file name="photo" label="Photo" required="true"
onchange="document.getElementById('imagePlaceHolder').src = window.URL.createObjectURL(this.files[0])"
/>
您可以在找到更多解决方案,我想onchange应该在file元素上,而不是在textfield上one@AndreaLigios修正,谢谢:)
<img id="imagePlaceHolder" alt="your image" width="100" height="100" />
<s:file name="photo" label="Photo" required="true"
onchange="document.getElementById('imagePlaceHolder').src = window.URL.createObjectURL(this.files[0])"
/>