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:

Java代码  

1. @Test  
2.         public void test02()  
3.         {  
4.             Process p = null;  
5.             String []command = null;  
6.   
7.             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  
8.             BufferedReader reader = null;  
9.             try  
10.             {  
11.                 p = Runtime.getRuntime().exec(command, null);//)  
12.                 reader = new BufferedReader(new InputStreamReader(p  
13.                         .getErrorStream(),"gbk"));  
14.                 StringBuilder sb = new StringBuilder();  
15.                 String readedLine = null;  
16.                 try  
17.                 {  
18.                     while ((readedLine = reader.readLine()) != null)  
19.                     {  
20.                         sb.append(readedLine);  
21.                         sb.append("\r\n");  
22.                     }  
23.                 }  
24.                 catch (IOException e)  
25.                 {  
26.                     e.printStackTrace();  
27.                 }  
28.                 finally  
29.                 {  
30.                     try  
31.                     {  
32.                         reader.close();  
33.                         p.destroy();  
34.                     }  
35.                     catch (IOException e)  
36.                     {  
37.                         e.printStackTrace();  
38.                     }  
39.                 }  
40.                 String content = sb.toString();  
41.                 System.out.println(content);  
42.             }  
43.             catch (IOException e)  
44.             {  
45.                 e.printStackTrace();  
46.             }  
47.   
48.         }  

 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:

Java代码  

1. @Test  
2.         public void test02()  
3.         {  
4.             Process p = null;  
5.             String []command = null;  
6. //          command = new String[]{"cmd"," /c ","dir"};//cmd /c is needed  
7.             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  
8.             BufferedReader reader = null;  
9.             try  
10.             {  
11.                 String commandFolder="D:\\Program Files\\ImageMagick-6.8.9-Q16\\";  
12.                 p = Runtime.getRuntime().exec(command, null,new File(commandFolder/*命令的所在目录*/));//)  
13.                 reader = new BufferedReader(new InputStreamReader(p  
14.                         .getErrorStream(),"gbk"));  
15.                 StringBuilder sb = new StringBuilder();  
16.                 String readedLine = null;  
17.                 try  
18.                 {  
19.                     while ((readedLine = reader.readLine()) != null)  
20.                     {  
21.                         sb.append(readedLine);  
22.                         sb.append("\r\n");  
23.                     }  
24.                 }  
25.                 catch (IOException e)  
26.                 {  
27.                     e.printStackTrace();  
28.                 }  
29.                 finally  
30.                 {  
31.                     try  
32.                     {  
33.                         reader.close();  
34.                         p.destroy();  
35.                     }  
36.                     catch (IOException e)  
37.                     {  
38.                         e.printStackTrace();  
39.                     }  
40.                 }  
41.                 String content = sb.toString();  
42.                 System.out.println(content);  
43.             }  
44.             catch (IOException e)  
45.             {  
46.                 e.printStackTrace();  
47.             }  
48.   
49.         }  

  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"