servlet用流读取客户机上传的文件

package test;


import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;


import javax.servlet.ServletException;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


import org.json.JSONArray;
import org.json.JSONObject;


import org.apache.commons.fileupload.DiskFileUpload;
import org.apache.commons.fileupload.FileItem;  
import org.apache.commons.fileupload.FileUploadException;  






public class SS extends HttpServlet
{



protected void processRequest(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException
{


String action=request.getParameter("action");

if("test".equals(action))
{
this.testParJson(request,response); 
}
else if("uploadpic".equals(action))
{
testParseimg(request,response);
}

}

//解析上传图片
private void testParseimg(HttpServletRequest request, HttpServletResponse response) throws IOException
{
flowToPic(request,response);
}

//把流转换成图片写到桌面
private void flowToPic(HttpServletRequest request, HttpServletResponse response) throws IOException
{
//临时目录
String temp =request.getSession().getServletContext().getRealPath("/")+"temp"; //在发布的位置新建一个解析文件的目录temp


//上传文件存放目录

String loadpath =request.getSession().getServletContext().getRealPath("/");


DiskFileUpload fu =new DiskFileUpload();

//设置允许用户上传文件大小，单位：字节
fu.setSizeMax(1*1024*1024);

//设置最多只允许在内存中存储的数据，单位：字节
fu.setSizeMax(40960000);

//设置一单文件大小超过getSizeThreshol（）的值时数据存放在硬盘的目录
fu.setRepositoryPath(temp);

//开始读取上传信息
int index =0;
List fileItems =null;
try 
{
fileItems =fu.parseRequest(request);
} 
catch (FileUploadException e) 
{
// TODO Auto-generated catch block
e.printStackTrace();
}
//一次处理每个上传文件
Iterator iter =fileItems.iterator();
while (iter.hasNext())
{

FileItem item = (FileItem) iter.next();  //忽略其他不是文件域的所有表单信息
if(!item.isFormField())
{
//获取上传文件名，包括路径
String name =item.getName();
System.out.println("test file uploadname...."+name);


index++;


File fNew =new File(loadpath+"head",name); //创建真正接收上传文件的目录 head
try 
{
item.write(fNew);

} 
catch (Exception e) 
{

e.printStackTrace();
}
}
else
{
//取出不是文件域的所有表单信息
String filedvalue =item.getString();
//如果包含中文应为：（转为UTF-8编码）
//String filedvalue =new String(item.getString().getBytes(),"UTF-8");

}
}








}




   
 
      //解析普元平台的json串
 private void testParJson(HttpServletRequest request, HttpServletResponse response) 

{

response.setContentType("text/html;charset=GBK");
try 
       {  
 

 
String data = request.getParameter("data"); //打断点查看发送过来的数据形式，可能是json数组形式
JSONArray jsonArr = new JSONArray(data);
 
for(int i=0;i<jsonArr.length();i++)
{
   JSONObject jsonObject  = jsonArr.getJSONObject(i);
   String name=jsonObject.getString("name");
           String age=jsonObject.getString("age");
           String sex=jsonObject.getString("sex");
           System.out.println("测试解析的json字符串:"+name+":"+age+":"+sex);  
}
            
        
         PrintWriter pw=response.getWriter();
         
         pw.write("no");
 pw.flush();
 pw.close();
 
       }
       catch (Exception e) 
       {  
          
       }

}


 
@Override
   protected void doGet(HttpServletRequest request, HttpServletResponse response)
           throws ServletException,
           IOException {
       processRequest(request, response);
   }


   @Override
   protected void doPost(HttpServletRequest request, HttpServletResponse response)
           throws ServletException,
           IOException {
       processRequest(request, response);
   }


   @Override
   public String getServletInfo()
   {
       return "Short description";
   }// </editor-fold>


  
}