在java中上传图片代码 javaweb实现图片上传

用Java写上传文件（图片）？

首先希望我的回答能给你带来帮助

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首先写一个上传类

public class products_shang_chuang {

public static boolean GOTO(String paht,FormFile file)

{

boolean bool =false;

int betered = 0;

byte[] buufer = new byte [2042];

if(file.getFileSize()0file.getFileSize()500000)

{

try {

InputStream in = file.getInputStream();//写入文件

OutputStream out = new FileOutputStream(paht);

while((betered=in.read(buufer, 0, 2042))!=-1)

{

out.write(buufer, 0, betered);//将文件写入服务器

}

in.close();

out.close();

bool = true;

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

bool = false;

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

bool = false;

e.printStackTrace();

}

}

return bool;

}

public static boolean delete_file(String path)

{

File file = new File(path);

boolean bool = false;

if(file.isFile())

{

System.out.println("文件存在");

bool = file.delete();

}

return bool;

}

}

这个类主要是上传和删除图片的类

那么下来直接调用就可以了 通过页面往action中提交数据

if(form instanceof Products_addForm)//如果form是FilesForm

{

String engding = request.getCharacterEncoding();

if((engding != null) (engding.equalsIgnoreCase("utf-8")))

{

response.setContentType("text/html; charset=gb2312");//如果没有指定编码，编码格式为gb2312

}

FormFile file = products_addForm.getFiles();

inpa = Huoqu_weiyi_biaoshi.getUniqueId();

String path = request.getRealPath("/guanliyuan/ji_zhu_products_img/"+(inpa+file.getFileName()));

System.out.println(path);

String name = file.getFileName();

inpa = "/guanliyuan/ji_zhu_products_img/"+inpa+file.getFileName();

bool = products_shang_chuang.GOTO(path, file);

}

这样就把图片上传上去了 仔细看看 批量上传和这个一样只是需要做一点点的改动而已

有什么不明白的可以联系我Q号：549726411

java 求jsp上传图片到服务器代码

提交页面表单

form action="up.jsp" enctype="multipart/form-data" method="post"

input type="file" name="file"

input type="submit" value="确定"

/form

上传页面up.jsp

%@page import="java.io.FileWriter"%

%@ page language="java" contentType="text/html; charset=UTF-8"

import="java.io.*"

pageEncoding="UTF-8"%

%

/**

协议头四行内容

45 -----------------------------7de231211204c4

80 Content-Disposition: form-data; name="file"; filename="xx.txt"

26 Content-Type: text/plain

2

标记文件结尾

-----------------------------7de231211204c4--

**/

ServletInputStream sin = request.getInputStream();

byte[] buffer = new byte[1024 * 8];

int length = 0, row = 0;

String mark = "";

String filename = "";

while ((length = sin.readLine(buffer, 0, buffer.length)) 0) {

out.println(length + " " + new String(buffer, 0, length, "UTF-8") + "br");

String s = new String(buffer, 0, length, "UTF-8");

if (row == 0)

mark = s.trim();

else if (s.indexOf("filename=") 0) {

int end = s.lastIndexOf("\"");

int start = s.substring(0, end).lastIndexOf("\"");

filename = s.substring(start + 1, end);

} else if ("".equals(s.trim()))

break;

row ++;

}

out.println("filename: " + filename + "br");

filename = request.getRealPath("/") + "../" + filename;

FileOutputStream fout = new FileOutputStream(filename);

while ((length = sin.readLine(buffer, 0, buffer.length)) 0) {

String s = new String(buffer, 0, length);

if (s.startsWith(mark))

break;

fout.write(buffer, 0, length);

}

fout.flush();

fout.close();

File f = new File(filename);

out.println(f.exists());

out.println(f.getAbsolutePath());

%

app怎么上传图片到java后台？java后台处理的具体代码是怎么写的？

使用一些已有的组件帮助我们实现这种上传功能。常用的上传组件：Apache的CommonsFileUploadJavaZoom的UploadBeanjspSmartUpload以下，以FileUpload为例讲解1、在jsp端要注意enctype="multipart/form-data"然后只需要放置一个file控件，并执行submit操作即可2、web端核心代码如下：publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{request.setCharacterEncoding("UTF-8");DiskFileItemFactoryfactory=newDiskFileItemFactory();ServletFileUploadupload=newServletFileUpload(factory);try{Listitems=upload.parseRequest(request);Iteratoritr=items.iterator();while(itr.hasNext()){FileItemitem=(FileItem)itr.next();if(item.isFormField()){System.out.println("表单参数名:"+item.getFieldName()+"，表单参数值:"+item.getString("UTF-8"));}else{if(item.getName()!=null!item.getName().equals("")){System.out.println("上传文件的大小:"+item.getSize());System.out.println("上传文件的类型:"+item.getContentType());System.out.println("上传文件的名称:"+item.getName());FiletempFile=newFile(item.getName());Filefile=newFile(sc.getRealPath("/")+savePath,tempFile.getName());item.write(file);request.setAttribute("upload.message","上传文件成功！");}else{request.setAttribute("upload.message","没有选择上传文件！");}}}}catch(FileUploadExceptione){e.printStackTrace();}catch(Exceptione){e.printStackTrace();request.setAttribute("upload.message","上传文件失败！");}request.getRequestDispatcher("/uploadResult.jsp").forward(request,response);}