Android 从WebServer 获取PDF转图片

Web服务器通过接口
讲PDF转化为图片，并保存在目录下，Android
可以直接访问web目录下图片内容
 
 
参考:android从网络中获得一张图片，并显示在屏幕上
c#或ASP.NET把PDF轉換為圖片源碼  

/////需要添加引用Ghostscript.NET.dll，另一个dll放入bin内（需要两个dll Ghostscript.NET.dll，gsdll32.dll)

 

 

 

ASP.NET WebServer程序

public int PDFToImage(string file, int dpi)
{
int i = 0;
foreach (string d in Directory.GetFileSystemEntries(System.Web.HttpContext.Current.Server.MapPath("\\" + "CntImg")))
{
if (File.Exists(d))
{
FileInfo fi = new FileInfo(d);
if (fi.Attributes.ToString().IndexOf("ReadOnly") != -1)
fi.Attributes = FileAttributes.Normal;
File.Delete(d);//直接删除其中的文件
}
}
string[] strimg;
string path = Path.GetDirectoryName(System.Web.HttpRuntime.BinDirectory);
Ghostscript.NET.Rasterizer.GhostscriptRasterizer rasterizer = null;
Ghostscript.NET.GhostscriptVersionInfo vesion = new Ghostscript.NET.GhostscriptVersionInfo(new System.Version(0, 0, 0), path + @"\gsdll32.dll", string.Empty, Ghostscript.NET.GhostscriptLicense.GPL);

using (rasterizer = new Ghostscript.NET.Rasterizer.GhostscriptRasterizer())
{
rasterizer.Open(file, vesion, false);
int count = rasterizer.PageCount;
strimg = new string[count];
for (i = 0; i < count; i++)
{
string pageFilePath = Path.Combine(System.Web.HttpContext.Current.Server.MapPath("\\" + "CntImg"), i.ToString() + ".jpg");
if (File.Exists(pageFilePath))
{
File.Delete(pageFilePath);
}
System.Drawing.Image img = rasterizer.GetPage(dpi, dpi, i + 1);
img.Save(pageFilePath, System.Drawing.Imaging.ImageFormat.Jpeg);
// strimg[i] = System.Convert.ToBase64String(Returnbyte(pageFilePath));
}
rasterizer.Close();
}
return i;
}
private byte[] Returnbyte(string strpath)
{
//以二进制方式读文件
FileStream fsMyfile = new FileStream(strpath, FileMode.OpenOrCreate, FileAccess.Read);
//创建一个二进制数据流读入器，和打开的文件关联
BinaryReader brMyfile = new BinaryReader(fsMyfile);
//把文件指针重新定位到文件的开始
brMyfile.BaseStream.Seek(0, SeekOrigin.Begin);
byte[] bytes = brMyfile.ReadBytes(Convert.ToInt32(fsMyfile.Length.ToString()));
//关闭以上的new的各个对象
brMyfile.Close();
return bytes;
}

Android端口代码

package com.bottle.stockmanage;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class GetImageStream {

public static byte[] getImage(String path) throws IOException {
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
conn.setRequestMethod("GET"); //设置请求方法为GET
conn.setReadTimeout(5*1000); //设置请求过时时间为5秒
InputStream inputStream = conn.getInputStream(); //通过输入流获得图片数据
byte[] data = StreamTool.readInputStream(inputStream);//获得图片的二进制数据
return data;

}

}

package com.bottle.stockmanage;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class StreamTool {
public static byte[] readInputStream(InputStream inputStream) throws IOException {
byte[] buffer = new byte[1024];
int len = 0;
ByteArrayOutputStream bos = new ByteArrayOutputStream();
while((len = inputStream.read(buffer)) != -1) {
bos.write(buffer, 0, len);
}
bos.close();
return bos.toByteArray();

}

}