Java实现的图片上传工具类完整实例

本文实例讲述了java实现的图片上传工具类。分享给大家供大家参考，具体如下：

package com.gcloud.common;
import javax.imageio.imageio;
import java.awt.image.bufferedimage;
import java.io.*;
/**
 * 图片上传工具类
 * created by charlin on 2017/9/10.
 */
public class uploadimageutil {
  private string filetype;
  private long maxsize;
  private long width;
  private long height;
  public uploadimageutil() { }
  public uploadimageutil(string filetype, long maxsize, long width, long height) {
    this.filetype = filetype;
    this.maxsize = maxsize;
    this.width = width;
    this.height = height;
  }
  /**
   * 检查上传图像大小
   *
   * @param upload
   * @param uploadfilename
   * @param uploadcontenttype
   * @return
   */
  public string checkuploadimage(file upload, string uploadfilename, string uploadcontenttype) {
    try {
      if (filetype != null) {
        string[] filetypes = filetype.split(",");
        int count = 0;
        for (int i = 0; i < filetypes.length; i++) {
          if (uploadcontenttype.equals(filetypes[i])) {
            count++;
            continue;
          }
        }
        if (count == 0) {
          return "您上传的文件类型不对!";
        }
      }
      bufferedimage bi = imageio.read(upload);
      int w = bi.getwidth();
      int h = bi.getheight();
      if (w > width || h > height) {
        return "上传照片宽度和高度不符合要求";
      }
      if (upload.length() > maxsize) {
        return "上传照片过大";
      }
    } catch (ioexception e) {
      e.printstacktrace();
    }
    return null;
  }
  /**
   * 图片上传
   *
   * @param upload
   * @param uploadfilename
   * @param path
   * @return
   * @throws exception
   */
  public void uploadimage(file upload, string uploadfilename, string path) throws exception {
    inputstream is = null;
    outputstream os = null;
    try {
      is = new fileinputstream(upload);
      file f = new file(path);
      if (!f.exists()) f.mkdirs();
      os = new fileoutputstream(path + "/" + uploadfilename);
      byte buffer[] = new byte[1024];
      int count = 0;
      int flag = 0;
      while ((count = is.read(buffer)) > 0) {
        os.write(buffer, 0, count);
      }
    } catch (filenotfoundexception e) {
    } catch (ioexception e) {
      file f = new file(path + "/" + uploadfilename);
      if (f.exists()) {
        f.delete();
      }
    } finally {
      try {
        os.close();
        is.close();
      } catch (ioexception ioe) {
      }
    }
  }
  /**
   * 清除文件
   * @param path
   */
  public void clear(string path) {
    file file = new file(path);
    if (file.isfile() && file.exists()) {
      file.delete();
    }
  }
  public string getfiletype() {
    return filetype;
  }
  public void setfiletype(string filetype) {
    this.filetype = filetype;
  }
  public long getmaxsize() {
    return maxsize;
  }
  public void setmaxsize(long maxsize) {
    this.maxsize = maxsize;
  }
  public long getwidth() {
    return width;
  }
  public void setwidth(long width) {
    this.width = width;
  }
  public long getheight() {
    return height;
  }
  public void setheight(long height) {
    this.height = height;
  }
}

更多java相关内容感兴趣的读者可查看本站专题：《java图片操作技巧汇总》、《java日期与时间操作技巧汇总》、《java操作dom节点技巧总结》、《java文件与目录操作技巧汇总》及《java数据结构与算法教程》。

希望本文所述对大家java程序设计有所帮助。