图片的上传java代码 图片的上传java代码怎么用

java上传图片

/**

*

*/

package net.hlj.chOA.action;

import java.io.File;

import java.io.UnsupportedEncodingException;

import java.sql.SQLException;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.Iterator;

import java.util.List;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import net.hlj.chOA.dao.DangAnDao;

import net.hlj.chOA.dao.LogDao;

import net.hlj.chOA.dao.ZiYuanDao;

import net.hlj.chOA.model.DangAn;

import net.hlj.chOA.model.User;

import net.hlj.chOA.model.ZiYuan;

import net.hlj.chOA.util.GetId;

import org.apache.commons.fileupload.FileItem;

import org.apache.commons.fileupload.FileUploadException;

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

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

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

import org.apache.struts.actions.DispatchAction;

/**

* @author lcy

*

*/

public class ZiYuanAction extends DispatchAction {

public ActionForward addZiYuan(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response) {

String title = "";

String fileupload="";

SimpleDateFormat fmt = new SimpleDateFormat("yyMMddhhssmmSSS");

Date now = new Date();

String date = fmt.format(now);

String filePath = request.getSession().getServletContext().getRealPath(

"/");

String uploadPath = filePath + "upload\\uploadZiYuan\\";

String tempPath = filePath + "upload\\uploadZiYuan\\" + "uploadTemp";

String suffix = null;

if (!new File(uploadPath).isDirectory()) {

new File(uploadPath).mkdirs();

}

DiskFileItemFactory factory = new DiskFileItemFactory();

factory.setSizeThreshold(4194304);// 设置初始化内存，如果上传的文件超过该大小，将不保存到内存，而且硬盘中(单位：byte)

File fileTemp = new File(tempPath);// 建立临时目录

fileTemp.mkdir();

factory.setRepository(fileTemp);

ServletFileUpload upload = new ServletFileUpload(factory);

upload.setSizeMax(4194304);// 设置客户端最大上传，-1为无限大（单位：byte）

try {

ListFileItem items = upload.parseRequest(request);

IteratorFileItem i = items.iterator();

String[] rightType = {".gif", ".jpeg", ".doc", ".xls",

".pdf", ".txt", ".rar" };

while (i.hasNext()) {

FileItem fi = (FileItem) i.next();

if (fi.isFormField()) {

try {

if (fi.getFieldName().equals("title")) {

title = fi.getString("UTF-8");

}

} catch (UnsupportedEncodingException e) {

log.error(e.getMessage(), e);

}

} else {

String fileName = fi.getName();

int l = fileName.length();

if (!fileName.equals("")) {

int pos = fileName.lastIndexOf(".");

// suffix = fileName.substring(l - 4, l);

suffix = fileName.substring(pos, l);

boolean result = false;

String ext = fileName.substring(fileName

.lastIndexOf("."));

for (int j = 0; j rightType.length; j++) {

if (ext.toLowerCase().equals(rightType[j])) {

result = true;

break;

}

}

if (!result) {

request.setAttribute("error", "上传文件类型有误！");

return mapping.findForward("addZiyuan");

}

// if (!suffix.equalsIgnoreCase(".jpg")

// !suffix.equalsIgnoreCase(".gif")

// !suffix.equalsIgnoreCase(".png")

// !suffix.equalsIgnoreCase(".bmp")) {

// request.setAttribute("message", "上传文件类型有误！");

// return mapping.findForward("danganList");

// }

if (fileName != null) {

File savedFile = new File(uploadPath, date + suffix);

try {

fi.write(savedFile);

fileupload = "upload/uploadZiYuan/" + date

+ suffix;

} catch (Exception e) {

log.error(e.getMessage(), e);

}

}

}

}

}

} catch (FileUploadException e) {

log.error(e.getMessage(), e);

}

ZiYuan zy=new ZiYuan();

zy.setTitle(title);

zy.setUpload(fileupload);

ZiYuanDao zyDao=new ZiYuanDao();

try {

zyDao.addZiYuan(zy, this.servlet.getServletContext());

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

LogDao lDao=new LogDao();

//删除操做添加日志 isDel 0是增加，1是删除，2是修改,3是审批

User user1 =(User)request.getSession().getAttribute("userBean");

String ip=request.getLocalAddr();

int id=GetId.getId("ziyuan", this.servlet.getServletContext());

try {

lDao.addLogMe("ziyuan", id , ip, user1.getName(), user1.getId(), 0, this.servlet.getServletContext());

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return mapping.findForward("ziyuanList");

}

public ActionForward deleteZiYuan(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response) {

String[] ids= request.getParameterValues("id");

ZiYuanDao zyDao=new ZiYuanDao();

LogDao lDao=new LogDao();

for(int i=0;iids.length;i++){

try {

zyDao.deleteZiYuan(Integer.parseInt(ids[i]), this.servlet.getServletContext());

} catch (NumberFormatException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

User user =(User)request.getSession().getAttribute("userBean");

String ip=request.getLocalAddr();

try {

lDao.addLogMe("tbl_users",Integer.parseInt(ids[i]), ip, user.getName(), user.getId(), 1, this.servlet.getServletContext());

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

return mapping.findForward("ziyuanList");

}

public ActionForward updateZiYuan(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response) throws NumberFormatException, SQLException {

String id="";

String title = "";

String fileupload="";

SimpleDateFormat fmt = new SimpleDateFormat("yyMMddhhssmmSSS");

Date now = new Date();

String date = fmt.format(now);

String filePath = request.getSession().getServletContext().getRealPath(

"/");

String uploadPath = filePath + "upload\\uploadZiYuan\\";

String tempPath = filePath + "upload\\uploadZiYuan\\" + "uploadTemp";

String suffix = null;

if (!new File(uploadPath).isDirectory()) {

new File(uploadPath).mkdirs();

}

DiskFileItemFactory factory = new DiskFileItemFactory();

factory.setSizeThreshold(4194304);// 设置初始化内存，如果上传的文件超过该大小，将不保存到内存，而且硬盘中(单位：byte)

File fileTemp = new File(tempPath);// 建立临时目录

fileTemp.mkdir();

factory.setRepository(fileTemp);

ServletFileUpload upload = new ServletFileUpload(factory);

upload.setSizeMax(4194304);// 设置客户端最大上传，-1为无限大（单位：byte）

try {

ListFileItem items = upload.parseRequest(request);

IteratorFileItem i = items.iterator();

String[] rightType = {".gif", ".jpeg", ".doc", ".xls",

".pdf", ".txt", ".rar" };

while (i.hasNext()) {

FileItem fi = (FileItem) i.next();

if (fi.isFormField()) {

try {

if (fi.getFieldName().equals("title")) {

title = fi.getString("UTF-8");

}

if (fi.getFieldName().equals("id")) {

id = fi.getString("UTF-8");

}

} catch (UnsupportedEncodingException e) {

log.error(e.getMessage(), e);

}

} else {

String fileName = fi.getName();

int l = fileName.length();

if (!fileName.equals("")) {

int pos = fileName.lastIndexOf(".");

// suffix = fileName.substring(l - 4, l);

suffix = fileName.substring(pos, l);

boolean result = false;

String ext = fileName.substring(fileName

.lastIndexOf("."));

for (int j = 0; j rightType.length; j++) {

if (ext.toLowerCase().equals(rightType[j])) {

result = true;

break;

}

}

if (!result) {

request.setAttribute("error", "上传文件类型有误！");

request.setAttribute("id", id);

return mapping.findForward("selectZiyuan");

}

// if (!suffix.equalsIgnoreCase(".jpg")

// !suffix.equalsIgnoreCase(".gif")

// !suffix.equalsIgnoreCase(".png")

// !suffix.equalsIgnoreCase(".bmp")) {

// request.setAttribute("message", "上传文件类型有误！");

// return mapping.findForward("danganList");

// }

if (fileName != null) {

File savedFile = new File(uploadPath, date + suffix);

try {

fi.write(savedFile);

fileupload = "upload/uploadZiYuan/" + date

+ suffix;

} catch (Exception e) {

log.error(e.getMessage(), e);

}

}

}else{

//这里写如果用户没有重写添加附件则保持原来的附件

ZiYuanDao zyDao = new ZiYuanDao();

ZiYuan zy=(ZiYuan)zyDao.selectZiYuanById(Integer.parseInt(id), this.servlet.getServletContext()).get(0);

fileupload=zy.getUpload();

}

}

}

} catch (FileUploadException e) {

log.error(e.getMessage(), e);

}

ZiYuan zy=new ZiYuan();

zy.setId(Integer.parseInt(id));

zy.setTitle(title);

zy.setUpload(fileupload);

ZiYuanDao zyDao=new ZiYuanDao();

try {

zyDao.updateZiYuan(zy, this.servlet.getServletContext());

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

LogDao lDao=new LogDao();

//删除操做添加日志 isDel 0是增加，1是删除，2是修改,3是审批

User user1 =(User)request.getSession().getAttribute("userBean");

String ip=request.getLocalAddr();

try {

lDao.addLogMe("ziyuan", Integer.parseInt(id) , ip, user1.getName(), user1.getId(), 2, this.servlet.getServletContext());

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return mapping.findForward("ziyuanList");

}

}

相关问答

Q1: java实现图片上传至服务器并显示，如何做？希望要具体的代码实现

很简单。

可以手写IO读写（有点麻烦）。

怕麻烦的话使用FileUpload组件 在servlet里doPost嵌入一下代码

public void doPost(HttpServletRequest request,HttpServletResponse response)

throws ServletException,IOException{

response.setContentType("text/html;charset=gb2312");

PrintWriter out=response.getWriter();

//设置保存上传文件的目录

String uploadDir =getServletContext().getRealPath("/up");

System.out.println(uploadDir);

if (uploadDir == null)

{

out.println("无法访问存储目录！");

return;

}

//根据路径创建一个文件

File fUploadDir = new File(uploadDir);

if(!fUploadDir.exists()){

if(!fUploadDir.mkdir())//如果UP目录不存在 创建一个 不能创建输出...

{

out.println("无法创建存储目录!");

return;

}

}

if (!DiskFileUpload.isMultipartContent(request))

{

out.println("只能处理multipart/form-data类型的数据!");

return ;

}

DiskFileUpload fu = new DiskFileUpload();

//最多上传200M数据

fu.setSizeMax(1024 * 1024 * 200);

//超过1M的字段数据采用临时文件缓存

fu.setSizeThreshold(1024 * 1024);

//采用默认的临时文件存储位置

//fu.setRepositoryPath(...);

//设置上传的普通字段的名称和文件字段的文件名所采用的字符集编码

fu.setHeaderEncoding("gb2312");

//得到所有表单字段对象的集合

List fileItems = null;

try

{

fileItems = fu.parseRequest(request);//解析request对象中上传的文件

}

catch (FileUploadException e)

{

out.println("解析数据时出现如下问题：");

e.printStackTrace(out);

return;

}

//处理每个表单字段

Iterator i = fileItems.iterator();

while (i.hasNext())

{

FileItem fi = (FileItem) i.next();

if (fi.isFormField()){

String content = fi.getString("GB2312");

String fieldName = fi.getFieldName();

request.setAttribute(fieldName,content);

}else{

try

{

String pathSrc = fi.getName();

if(pathSrc.trim().equals("")){

continue;

}

int start = pathSrc.lastIndexOf('\\');

String fileName = pathSrc.substring(start + 1);

File pathDest = new File(uploadDir, fileName);

fi.write(pathDest);

String fieldName = fi.getFieldName();

request.setAttribute(fieldName, fileName);

}catch (Exception e){

out.println("存储文件时出现如下问题：");

e.printStackTrace(out);

return;

}

finally //总是立即删除保存表单字段内容的临时文件

{

fi.delete();

}

}

}

注意 JSP页面的form要加enctype="multipart/form-data" 属性， 提交的时候要向服务器说明一下 此页面包含文件。

如果 还是麻烦，干脆使用Struts 的上传组件 他对FileUpload又做了封装，使用起来更傻瓜化，很容易掌握。

-----------------------------

以上回答，如有不明白可以联系我。

Q2: 解释一下这段JAVA 关于图片上传的代码

private File file;

private String fileFileName;

private String picture;

//都有getter 和 setter

InputStream is = new FileInputStream(file);

//引入一个IO流的输入流

String root = ServletActionContext.getRequest()

.getRealPath("/bookpicture");

//通过REQUEST来得到相对地址图片的上传java代码，并在后面加上/bookpicture

File f = new File(root, this.getFileFileName());

//定义一个FILE文件图片的上传java代码，第一个参数是文件的路径图片的上传java代码，第二个是文件的名字

picture="."+"\\"+"bookpicture"+"\\"+this.getFileFileName();

//为PICTURE字符串赋值图片的上传java代码，/地址/文件名

System.out.println

("======picture====="+picture);

//从控制台输出Picture

OutputStream os = new FileOutputStream(f);

//第一个文件的输出流

byte[] buffer = new byte[1024];

//定义一个bufer的字符串图片的上传java代码，长度为1024

int len = 0;

while ((len = is.read(buffer)) 0) {

//如果从制定文件中读取到的信息为结束就继续循环

os.write(buffer, 0, len);

//将文件读出的内容写入到指定的文件中

}

Q3: 怎么用Java实现图片上传

下面这是servlet图片的上传java代码的内容：

package demo;

import java.io.File;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.List;

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.ProgressListener;

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

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

public class DemoServlet extends HttpServlet {

private static final String UPLOAD_DIRECTORY = "upload";

private static final int MEMORY_THRESHOLD = 1024 * 1024 * 3; // 3MB

private static final int MAX_FILE_SIZE = 1024 * 1024 * 40; // 40MB

private static final int MAX_REQUEST_SIZE = 1024 * 1024 * 50; // 50MB

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

DiskFileItemFactory factory=new DiskFileItemFactory();

ServletFileUpload sfu=new ServletFileUpload(factory);

sfu.setHeaderEncoding("UTF-8");

sfu.setProgressListener(new ProgressListener() {

public void update(long pBytesRead, long pContentLength, int pItems) {

System.out.println("文件大小为："+pContentLength+",当前已处理："+pBytesRead);

}

});

//判断提交上来的数据是否是上传表单的数据

if(!ServletFileUpload.isMultipartContent(request)){

PrintWriter writer= response.getWriter();

writer.println("Error:表单必须包含 enctype=multipart/form-data");

writer.flush();

return;

}

factory.setSizeThreshold(MEMORY_THRESHOLD);

//设置临时储存目录

factory.setRepository(new File(System.getProperty("java.io.tmpdir")));

//设置最大文件上传值

sfu.setFileSizeMax(MAX_FILE_SIZE);

//设置最大请求值（包含文件和表单数据）

sfu.setSizeMax(MAX_REQUEST_SIZE);

String uploadpath=getServletContext().getRealPath("./")+ File.separator+UPLOAD_DIRECTORY;

File file=new File(uploadpath);

if(!file.exists()){

file.mkdir();

}

try {

ListFileItem formItems = sfu.parseRequest(request);

if(formItems!=nullformItems.size()0){

for(FileItem item:formItems){

if(!item.isFormField()){

String fileName=new File(item.getName()).getName();

String filePath=uploadpath+File.separator+fileName;

File storeFile=new File(filePath);

System.out.println(filePath);

item.write(storeFile);

request.setAttribute("message", "文件上传成功！");

}

}

}

} catch (Exception e) {

request.setAttribute("message", "错误信息："+e.getMessage());

}

getServletContext().getRequestDispatcher("/demo.jsp").forward(request, response);

}

}

下面是jsp的内容图片的上传java代码，jsp放到webapp下图片的上传java代码，如果想放到WEB-INF下就把servlet里转发的路径改一下：

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

pageEncoding="UTF-8"%

!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" ""

html

head

meta http-equiv="Content-Type" content="text/html; charset=UTF-8"

titleInsert title here/title

/head

body

form action="demo.do" enctype="multipart/form-data" method="post"

input type="file" name="file1" /

%

String message = (String) request.getAttribute("message");

%

%=message%

input type="submit" value="提交"/

/form

/body

/html

这段代码可以实现普通的文件上传图片的上传java代码，有大小限制，上传普通的图片肯定没问题，别的一些小的文件也能传

Q4: java怎样上传图片(写个例子谢谢);

我有一段上传图片的代码，并且可以根据实际，按月或按天等，生成存放图片的文件夹

首先在JSP上放一个FILE的标签这些我都不说了，你也一定明白，我直接把处理过程给你发过去

我把其中存到数据库中的内容删除了，你改一下就能用

/**

*

* 上传图片

* @param servlet

* @param request

* @param response

* @return

* @throws Exception

*/

//这里我是同步上传的，你随意

public synchronized String importPic(HttpServlet servlet, HttpServletRequest request,HttpServletResponse response) throws Exception {

SimpleDate()Format formatDate() = new SimpleDate()Format("yyyyMM");

Date nowtime=new Date();

String formatnowtime=formatDate.format(nowtime);

File root = new File(request.getRealPath("/")+"uploadfile/images/"+formatnowtime+"/"); //应保证在根目录中有此目录的存在 如果没有，下面则上创建新的文件夹

if(!root.isDirectory())

{

System.out.println("创建新文件夹成功"+formatnowtime);

root.mkdir();

}

int returnflag = 0;

SmartUpload mySmartUpload =new SmartUpload();

int file_size_max=1024000;

String ext="";

String url="uploadfile/images/"+formatnowtime+"/";

// 只允许上载此类文件

try{

// 初始化

mySmartUpload.initialize(servlet.getServletConfig(),request,response);

mySmartUpload.setAllowedFilesList("jpg,gif,bmp,jpeg,png,JPG");

// 上载文件

mySmartUpload.upload();

} catch (Exception e){

response.sendRedirect()//返回页面

}

com.jspsmart.upload.File myFile = mySmartUpload.getFiles().getFile(0);

if (myFile.isMissing()){ //没有选择图片做提示！

returnflag = 3;

}else{

String myFileName=myFile.getFileName(); //取得上载的文件的文件名

ext= myFile.getFileExt(); //取得后缀名

if(ext.equals("jpg")||ext.equals("gif")||ext.equals("bmp")||ext.equals("jpeg")||ext.equals("png")||ext.equals("JPG")){ //jpeg,png不能上传!)

int file_size=myFile.getSize(); //取得文件的大小

String saveurl="";

if(file_sizefile_size_max){

try{

//我上面说到，把操作数据库的代友删除了，这里就应该是判断，你的图片是不是已经存在了，存在要怎么处理，不存在要怎么处了，就是你的事了 }

//更改文件名，取得当前上传时间的毫秒数值

Calendar calendar = Calendar.getInstance();

//String filename = String.valueOf(calendar.getTimeInMillis());

String did = contractBean.getMaxSeq("MULTIMEDIA_SEQ");

String filename = did;

String flag = "0";

String path = request.getRealPath("/")+url;

String ename = myFile.getFileExt();

//.toLowerCase()转换大小写

saveurl=request.getRealPath("/")+url;

saveurl+=filename+"."+ext; //保存路径

myFile.saveAs(saveurl,mySmartUpload.SAVE_PHYSICAL);

//将图片信息插入到数据库中

// ------上传完成，开始生成缩略图-----

java.io.File file = new java.io.File(saveurl); //读入刚才上传的文件

String newurl=request.getRealPath("/")+url+filename+"_min."+ext; //新的缩略图保存地址

Image src = javax.imageio.ImageIO.read(file); //构造Image对象

float tagsize=200;

int old_w=src.getWidth(null);

int old_h=src.getHeight(null);

int new_w=0;

int new_h=0;

int tempsize;

float tempdouble;

if(old_wold_h){

tempdouble=old_w/tagsize;

}else{

tempdouble=old_h/tagsize;

}

// new_w=Math.round(old_w/tempdouble);

// new_h=Math.round(old_h/tempdouble);//计算新图长宽

new_w=150;

new_h=110;//计算新图长宽

BufferedImage tag = new BufferedImage(new_w,new_h,BufferedImage.TYPE_INT_RGB);

tag.getGraphics().drawImage(src,0,0,new_w,new_h,null); //绘制缩小后的图

FileOutputStream newimage=new FileOutputStream(newurl); //输出到文件流

JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(newimage);

encoder.encode(tag); //近JPEG编码

newimage.close();

returnflag = 1;

}else{

returnflag = 0;

System.out.println("('上传文件大小不能超过"+(file_size_max/1000)+"K');");

}

}else{

returnflag = 2;

}

}

response.sendRedirect();

return "11";

}

Q5: 求JAVA上传图片代码

package com;

import java.io.*;

import javax.servlet.*;

import javax.servlet.http.*;

import javax.servlet.jsp.*;

import com.jspsmart.upload.*;

public class uploadfiles extends HttpServlet

{

public void doGet(HttpServletRequest request,HttpServletResponse response)

throws ServletException,IOException

{

//使用了一个第三方的组件，存放在web-inf/lib下

response.setContentType("text/html;charset=GB2312");

//由于SmartUpload的初始化方法需要pageContext,所以我们在servlet中得到他

//为了得到pageConext要首先得到JspFactory的实例

//通过JspFactory的实例的getPageContext方法得到pageConext的实例

JspFactory jf = null;

//得到JspFactory的实例

jf=JspFactory.getDefaultFactory();

/*

getPageContext(Servlet servlet,

ServletRequest request,

ServletResponse response,

java.lang.String errorPageURL,

boolean needsSession,

int buffer,

boolean autoflush)

*/

PageContext pageContext=jf.getPageContext(this,request,response,null,true,8192,true);

try

{

//实例化SmartUpload

SmartUpload mySmartUpload=new SmartUpload();

//初始化SmartUpload的实例，需要PageContext的实例

mySmartUpload.initialize(pageContext);

//设定最大上传的字节数，其实可以不进行设定，表示上传的文件没有大小限制

//mySmartUpload.setTotalMaxFileSize(10000000);

mySmartUpload.upload();

//下面是单文件上传

//上传的文件以com.jspsmart.upload.File 代表，如果文件名称重复，则进行覆盖

com.jspsmart.upload.File file=mySmartUpload.getFiles().getFile(0);

String upLoadFileName=file.getFileName();

//调用com.jspsmart.upload.File实例的saveas的方法保存文件，此时的文件名即是

//保存到服务器上的文件名

file.saveAs("/upload/"+upLoadFileName);

Request req =

Text t = .....;

t.setUpload(upLoadFileName);

t.set.....(req);

}

catch(SmartUploadException e)

{

System.out.println(e.getMessage());

}

}

protected void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, java.io.IOException

{

doGet(request,response);

}

}

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