Ajax 图片上传 和 后台处理

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，导入js .

<script type="text/javascript"
    src="${pageContext.request.contextPath}/cmsui/javascript/jquery.js"></script>
<script type="text/javascript"
    src="${pageContext.request.contextPath}/cmsui/ui/jquery.form.js"></script>

HTML form 表单

<form id="imgfilesupload" action="file_imgFileUpload.action"
                    method="post" enctype="multipart/form-data" isclick="0">
                    <input type="file" name="file" dataType="Require" msg="请选择视频封面图片" />
                    <button id="imgsSubmit" type="button" class="button">上传</button>
                </form>

JS代码

       $("#imgsSubmit").click(function() {
             var tf = Validator.Validate($("#imgfilesupload")[0], 2);
             if (tf != true) {
                    return;
                }
            
             $(this).attr("disabled","disabled");
                $("#imgfilesupload").ajaxSubmit({
                    success : function(result) {
                        var num = result.replace(/<[^>]+>/g, "");
                        var msg = "成功！";
                        var isclick = "1";
                        if (num == "0") {
                            msg = "失败！";
                            isclick = "0";
                        } else if (num == "-1") {
                            msg = "图片格式不正确！";
                            isclick = "0";
                        }
                        top.Dialog.alerts("提示", msg, function() {
                            $("#imgurl").val(num);
                            $("#videoimg").attr("src",num);
                            $("#imgfilesupload").attr("isclick", isclick);
                        });
                    }

                } );
        });

Action:  

    private File file; // 上传的文件
    private String fileFileName; // 文件名称
    private String fileContentType; // 文件类型
    private String oldimgurl; // 上传返回结果
    private String oldvideourl; // 上传返回结果
    
    private final FileUploadServie fs = new FileUploadServie();


    public void imgFileUpload() throws IOException {
            boolean  tf = super.checkImg(fileFileName);
            if(tf==false)
                super.setAjaxData("-1");
            
             String newurl ;
            if (fileFileName != null && !"".equals(fileFileName)) {
                newurl = fs.fileWriteRead("Images", file, fileFileName);
                if(oldimgurl!=null)
                     fs.removeFile(oldimgurl);
                
                super.setAjaxData(newurl);
            } else {
                super.setAjaxData("-1");
            }
    
        }

调用的类：

package www.pdwy.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;

public class FileUploadServie {
    //工程绝对路径
    private final String ServerPath = ServletActionContext.getServletContext().getRealPath("");
    //上传文件的绝对路径
    private String FileInSerPath = null;
    //上传文件的文件名字
    private String fileName = null;
    //存数据库使用相对定位
    private String xdurl=null;

    /*
     * 文件上传 *
     */

    public String fileWriteRead(String folders, File sfile, String imagefileName)
            throws IOException {
        
        String foldersInSerPath = ServerPath +"\\"+ folders;     
        // 创建File 对象
        try {
            File efile = null;

            efile = new File(foldersInSerPath);
            // 判断目录图片文件夹是否存在
            if (!efile.exists()) {
                // 不存在进行创建
                efile.mkdirs();
            }
            // 获取文件后缀名
            String sufName = imagefileName.substring(imagefileName
                    .lastIndexOf("."));
            // 获取当前系统时间
            String fname = "" + System.currentTimeMillis();
            // 重新命名文件名字
            // 判断文件是否存在
            int i = 0;
            do {
                if (i == 0) {
                    fileName =  fname + sufName;
                 
                } else {
                    fileName =  fname + "(" + i + ")" + sufName;
                    
                }
                FileInSerPath = foldersInSerPath +"\\"+ fileName;
                xdurl =folders+"/"+fileName;
                efile = new File(FileInSerPath);
                i++;
            } while (efile.exists() == true);

            // 实例化输入输出流进行准备
            InputStream is = new FileInputStream(sfile);
            OutputStream os = new FileOutputStream(efile);
            int temp = 0;
            int len=0;
            byte b[] = new byte[1024*10];
            
            while((temp = is.read())!=-1){
                b[len] = (byte) temp;
                len++;         
                if(len==1024*10){
                    os.write(b, 0, len);
                    os.flush();
                    len=0;
                }        
            }
            
            if(temp==-1){
                
                os.write(b, 0, len);
                os.flush();
                len=0;
            }
            // 删除缓存
            sfile.delete();
            is.close();
            os.close();
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("文件上传失败");
            return "-1";
        }
        return xdurl;
    }

    /**
     * 文件下载 type:-1 下载出错 -2：文件不存在 0：下载成功
     * 
     * @throws UnsupportedEncodingException
     */

    public int FileDown(String path, String type, String name)
            throws UnsupportedEncodingException {
        InputStream is = null;
        OutputStream os = null;
        path = ServletActionContext.getServletContext().getRealPath("") + "\\"
                + path;

        // 判断文件在不在
        File SerFile = new File(path);
        if (!SerFile.exists())
            return -2;
        // 文件存在进行下步处理

        // 获取后缀名
        String sufName = path.substring(path.lastIndexOf("."));
        // 定义文件名
        String fileName = name + sufName;
        // 输入流实例化
        try {
            is = new FileInputStream(SerFile);
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return -1;
        }
        HttpServletResponse response = ServletActionContext.getResponse();
        // 设置响应类型
        response.setContentType(type);
        // 输出流实例化
        try {
            os = response.getOutputStream();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return -1;
        }
        // 设置下载文件名

        response.addHeader("Content-Disposition", "attachment;filename="
                + new String(fileName.getBytes(), "iso-8859-1"));
        // 设置下载文件大小
        response.addHeader("Content-Length", "" + SerFile.length());

        int i = 0;
        byte[] b = new byte[1024 * 8];

        try {

            while ((i = is.read(b)) > 0) {
                os.write(b, 0, i);
            }

        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return -1;
        }
        try {
            is.close();

            os.flush();
            os.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return 0;

    }

    // 删除文件
    public boolean removeFile(String path) {
        
        
        File f = null;
        try{
        if(path==null){
             f = new File(FileInSerPath);
        }else{
            //转换符号
             
            String jdPath =ServerPath+"\\"+ path.replaceAll("/","\\\\");
            f = new File(jdPath);
            
        }
        
            // 判断文件是否存在 存在的话进行删除，否则不删除
                if (f.exists()) {
                    f.delete();
                     System.out.println("删除图片");
                }
             
        }catch(Exception e){
            e.printStackTrace();
            return false;
        }
        
        return true;
    }

}

转载于:https://my.oschina.net/yangcaoling/blog/294939