使用mogrify 转化图片格式为RGB

mogrify 下载地址:http://www.imagemagick.org/script/binary-releases.php#windows

cmd执行结果:

 mogrify -colorspace RGB -quality 100 "D:\software\eclipse\workspace2\demo_channel_terminal\src\main\resources\mini.jpg"

说明:最后一个参数是要转化的图片全路径.

 

那么如何使用java 来调用呢?

测试代码:

@Test
	    public void test02()
	    {
	        Process p = null;
	        String []command = null;

	        command = new String[]{"cmd"," /c ","mogrify.exe" ,"-colorspace", "RGB", "-quality" ,"100" ,"\"D:\\software\\eclipse\\workspace2\\demo_channel_terminal\\src\\main\\resources\\mini.jpg\""};//cmd /c is needed
	        BufferedReader reader = null;
	        try
	        {
	            p = Runtime.getRuntime().exec(command, null);//)
	            reader = new BufferedReader(new InputStreamReader(p
	                    .getErrorStream(),"gbk"));
	            StringBuilder sb = new StringBuilder();
	            String readedLine = null;
	            try
	            {
	                while ((readedLine = reader.readLine()) != null)
	                {
	                    sb.append(readedLine);
	                    sb.append("\r\n");
	                }
	            }
	            catch (IOException e)
	            {
	                e.printStackTrace();
	            }
	            finally
	            {
	                try
	                {
	                    reader.close();
	                    p.destroy();
	                }
	                catch (IOException e)
	                {
	                    e.printStackTrace();
	                }
	            }
	            String content = sb.toString();
	            System.out.println(content);
	        }
	        catch (IOException e)
	        {
	            e.printStackTrace();
	        }

	    }

 执行报错:

 'mogrify.exe' 不是内部或外部命令，也不是可运行的程序

或批处理文件。

但是我在命令行里面执行没有问题呀!!!

为什么命令行里面没问题,java调用就有问题呢?

最后找到了原因:java执行本地命令时要指定命令(exe文件)所在路径

String commandFolder="D:\\Program Files\\ImageMagick-6.8.9-Q16\\";

           p = Runtime.getRuntime().exec(command, null,new File(commandFolder/*命令的所在目录*/));//)

           reader = new BufferedReader(new InputStreamReader(p

                   .getErrorStream(),"gbk"));

 

正确的代码如下:

@Test
	    public void test02()
	    {
	        Process p = null;
	        String []command = null;
//	        command = new String[]{"cmd"," /c ","dir"};//cmd /c is needed
	        command = new String[]{"cmd"," /c ","mogrify.exe" ,"-colorspace", "RGB", "-quality" ,"100" ,"\"D:\\software\\eclipse\\workspace2\\demo_channel_terminal\\src\\main\\resources\\mini.jpg\""};//cmd /c is needed
	        BufferedReader reader = null;
	        try
	        {
	        	String commandFolder="D:\\Program Files\\ImageMagick-6.8.9-Q16\\";
	            p = Runtime.getRuntime().exec(command, null,new File(commandFolder/*命令的所在目录*/));//)
	            reader = new BufferedReader(new InputStreamReader(p
	                    .getErrorStream(),"gbk"));
	            StringBuilder sb = new StringBuilder();
	            String readedLine = null;
	            try
	            {
	                while ((readedLine = reader.readLine()) != null)
	                {
	                    sb.append(readedLine);
	                    sb.append("\r\n");
	                }
	            }
	            catch (IOException e)
	            {
	                e.printStackTrace();
	            }
	            finally
	            {
	                try
	                {
	                    reader.close();
	                    p.destroy();
	                }
	                catch (IOException e)
	                {
	                    e.printStackTrace();
	                }
	            }
	            String content = sb.toString();
	            System.out.println(content);
	        }
	        catch (IOException e)
	        {
	            e.printStackTrace();
	        }

	    }

  mogrify网盘下载地址:http://pan.baidu.com/s/1i3vHPOh

安装完成之后目录情况:

 

参考:http://iaiai.iteye.com/blog/1461370

注意:

(1)java 执行dir或ipconfig的命令不需要执行命令所在目录,但是执行用户安装上的exe就必须执行命令所在目录;

(2)java执行操作系统命令时一定要加上"cmd  /c"