图片与Base64相互转换

此文出自：http://izbl.blog.163.com/blog/static/18286533320127305177140/

C#与java通用

最近研究手机图片上传至网站服务器功能，搜索了下，使用下面代码实现，记录

服务器端web service写图片转换方法,将上传的字符串转换为图片保存至服务器网站目录下

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/// <summary>
/// 手机用户上传景区图片接口
/// </summary>
/// <param name="scenicid">景区id</param>
/// <param name="Base64String">图片Base64字符串</param>
/// <param name="picname">图片名称</param>
/// <param name="content">图片说明</param>
/// <returns>0成功 -1失败</returns>
[WebMethod]
public int InsScenicPic(string scenicid, string Base64String, string picname, string content)
{
S_HDM_PICTURE sInfo = new S_HDM_PICTURE();
ClsScenic cls = new ClsScenic();
string pname = DateTime.Now.ToString("yyyyMMddHHmmss");
string picurl = "D:/wwwroot/LCTravel/wwwroot/upload/scenic/PhoneAdd/" + pname;
Base64StringToImage(picurl, Base64String);

sInfo.picclass = "5";
sInfo.picurl = "/upload/scenic/PhoneAdd/" + pname + ".jpg";
sInfo.picname = picname;
sInfo.createby = "";
sInfo.upload = "1";
sInfo.picsclass = "2";
sInfo.piccontent = content;
sInfo.hotelid = scenicid;

int iReturn = cls.InsertScenicPictureInfo(ref sInfo);

return iReturn;
}

/// <summary>
/// base64编码的文本转为图片
/// </summary>
/// <param name="txtFileName">保存的路径加文件名</param>
/// <param name="inputStr">要转换的文本</param>
private void Base64StringToImage(string txtFileName, string inputStr)
{
try
{
//FileStream ifs = new FileStream(txtFileName, FileMode.Open, FileAccess.Read);
//StreamReader sr = new StreamReader(ifs);

//  String inputStr = sr.ReadToEnd();
byte[] arr = Convert.FromBase64String(inputStr);
MemoryStream ms = new MemoryStream(arr);
Bitmap bmp = new Bitmap(ms);

bmp.Save(txtFileName + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
//bmp.Save(txtFileName + ".bmp", ImageFormat.Bmp);
//bmp.Save(txtFileName + ".gif", ImageFormat.Gif);
//bmp.Save(txtFileName + ".png", ImageFormat.Png);
ms.Close();
//sr.Close();
//ifs.Close();
//this.pictureBox1.Image = bmp;

}
catch (Exception ex)
{

}
}

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手机客户端代码
java图片转换全代码:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace WindowsFormsApplication1
{
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}
//图片 转为    base64编码的文本
private void button1_Click(object sender, EventArgs e)
{
OpenFileDialog dlg = new OpenFileDialog();
dlg.Title = "选择要转换的图片";
dlg.Filter = "Image files (*.jpg;*.bmp;*.gif)|*.jpg*.jpeg;*.gif;*.bmp|AllFiles (*.*)|*.*";
if (DialogResult.OK == dlg.ShowDialog())
{
ImgToBase64String(dlg.FileName);
}
}
//base64编码的文本转为图片
private void button2_Click(object sender, EventArgs e)
{
OpenFileDialog dlg = new OpenFileDialog();
dlg.Title = "选择要转换的base64编码的文本";
dlg.Filter = "txt files|*.txt";
if (DialogResult.OK == dlg.ShowDialog())
{
Base64StringToImage(dlg.FileName);
}
}

//图片 转为    base64编码的文本
private void ImgToBase64String(string Imagefilename)
{
try
{
Bitmap bmp = new Bitmap(Imagefilename);
this.pictureBox1.Image = bmp;
FileStream fs = new FileStream(Imagefilename + ".txt", FileMode.Create);
StreamWriter sw = new StreamWriter(fs);

MemoryStream ms = new MemoryStream();
bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
byte[] arr = new byte[ms.Length];
ms.Position = 0;
ms.Read(arr, 0, (int)ms.Length);
ms.Close();
String strbaser64 = Convert.ToBase64String(arr);
sw.Write(strbaser64);

sw.Close();
fs.Close();
MessageBox.Show("转换成功!");
}
catch (Exception ex)
{
MessageBox.Show("ImgToBase64String 转换失败\nException:" + ex.Message);
}
}

//base64编码的文本转为    图片
private void Base64StringToImage(string txtFileName)
{
try
{
FileStream ifs = new FileStream(txtFileName, FileMode.Open, FileAccess.Read);
StreamReader sr = new StreamReader(ifs);

String inputStr = sr.ReadToEnd();
byte[] arr = Convert.FromBase64String(inputStr);
MemoryStream ms = new MemoryStream(arr);
Bitmap bmp = new Bitmap(ms);

bmp.Save(txtFileName + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
//bmp.Save(txtFileName + ".bmp", ImageFormat.Bmp);
//bmp.Save(txtFileName + ".gif", ImageFormat.Gif);
//bmp.Save(txtFileName + ".png", ImageFormat.Png);
ms.Close();
sr.Close();
ifs.Close();
this.pictureBox1.Image = bmp;
MessageBox.Show("转换成功！");
}
catch (Exception ex)
{
MessageBox.Show("Base64StringToImage 转换失败\nException：" + ex.Message);
}
}
}
}

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