package servlets;

/**

*

* 此类用于处理编辑器图片上传功能

* 在处理有中文的url请求时没用

* 这个问题以后再来讨论

*

*/

import java.io.File;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Iterator;

import java.util.List;

import java.util.UUID;

import javax.servlet.ServletContext;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

@SuppressWarnings("serial")

public class ImageUploadServlet extends HttpServlet{

@SuppressWarnings("rawtypes")

@Override

protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

//生成文件标识

resp.setContentType("text/html;charset=utf-8");

ServletContext sc=this.getServletContext();

String tempFile="/temp";

String filePath="/images/tiezi";

tempFile=sc.getRealPath(tempFile);

filePath=sc.getRealPath(filePath);

PrintWriter out=resp.getWriter();

try {

DiskFileItemFactory df=new DiskFileItemFactory();

//设置向硬盘写数据时所用的缓冲区的大小

df.setSizeThreshold(4*1024); //4K

//设置临时目录

df.setRepository(new File(tempFile));

//创建一个上传器

ServletFileUpload sf=new ServletFileUpload(df);

sf.setSizeMax(4*1024*1024);

List items=sf.parseRequest(req);

Iterator iter=items.iterator();

String filename=null;

while(iter.hasNext()){

FileItem item=(FileItem)iter.next();

if(item.isFormField()){

processFormField(item);

}else{

filename=processUploadFile(item,filePath);

}

}

if(filename==null)return;

out.print("{\"url\":\"tiezi/"+filename+"\",state:\"SUCCESS\"}");

}catch(Exception e){

e.printStackTrace();

}

}

//这个方法用于出来表单域

@SuppressWarnings("unused")

private void processFormField(FileItem item){

String name=item.getFieldName();

String value=item.getString();

}

//这个方法用于处理文件域

private String processUploadFile(FileItem item,String filePath){

String fileName=item.getName();

System.out.println(fileName);

int index=fileName.lastIndexOf("\\");

fileName=fileName.substring(index+1,fileName.length());

long fileSize=item.getSize();

if(fileName.equals("")&&fileSize==0){

return null;

}

UUID uid=UUID.randomUUID();

String fileid=uid.toString();

File uploadFile=new File(filePath+"/"+fileid);

try {

item.write(uploadFile);

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return fileid;

}

}