Java Servlet / Jsp图像上传以及表单值

时间:2012-06-26 23:59:02

标签: java image servlets parameters upload

我有一个jsp表单,其中包含有关员工姓名,性别,年龄,电子邮件地址和a的详细信息

1 个答案:

答案 0 :(得分:2)

Servlet 3.0容器具有对多部分数据的标准支持。首先,您应该编写一个HTML页面,该页面将文件输入与其他输入参数一起使用。

<form action="uploadservlet" method="post" enctype="multipart/form-data">
    <input type="text" name="name" />
    <input type="text" name="age" />
    <input type="file" name="photo" />
    <input type="submit" />
</form>

现在编写一个使用Servlet 3.0上传API的UploadServlet。以下是演示API用法的代码。解决servlet处理多部分数据应该使用以下两种方法中的任何一种来定义MultiPartConfig:

    关于Servlet类的
  • @MultiPartConfig注释
  • web.xml, <multipart-config>内添加<servlet>条目。

这是UploadServlet,

@MultipartConfig
 public class UploadServlet extends HttpServlet
 {
   protected void service(HttpServletRequest request, 
       HttpServletResponse responst) throws ServletException, IOException
   {
      Collection<Part> parts = request.getParts();
      if (parts.size() != 3) {
         //can write error page saying all details are not entered
       }

       Part filePart = httpServletRequest.getPart("photo");
       InputStream imageInputStream = filePart.getInputStream();
       //read imageInputStream
       filePart.write("somefiepath");
       //can also write the photo to local storage

       //Read Name, String Type 
       Part namePart = request.getPart("name");
       if(namePart.getSize() > 20){
           //write name cannot exceed 20 chars
       }
       //use nameInputStream if required        
       InputStream nameInputStream = namePart.getInputStream();
       //name , String type can also obtained using Request parameter 
       String nameParameter = request.getParameter("name");

       //Similialrly can read age properties
       Part agePart = request.getPart("age");
       int ageParameter = Integer.parseInt(request.getParameter("age"));



    }

}

如果您没有使用Sevlet 3.0容器,那么您应该完善Apache Commons File Upload。以下是使用Apache Commons文件上传的链接:

<强>参考文献: