JAVA 调用shell脚本

最新推荐文章于 2021-01-26 15:15:01 发布

原创最新推荐文章于 2021-01-26 15:15:01 发布 · 615 阅读

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CC 4.0 BY-SA版权

文章标签：

#shell #java #command #string #output #stream

本文介绍如何使用Java执行命令并读取输出，包括无参数命令、带参数命令及参数包含空格的情况；演示了如何从命令中获取输入流并逐字符处理输出；最后展示了如何向命令发送输入。

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1：Reading Output from a Command.

try {
        // Execute a command without arguments
        String command = "ls";
        Process child = Runtime.getRuntime().exec(command);

        // Execute a command with an argument
        command = "ls /tmp";
        child = Runtime.getRuntime().exec(command);
    } catch (IOException e) {
    }
If an argument contain spaces, it is necessary to use the overload that requires the command and its arguments to be supplied in an array:

    try {
        // Execute a command with an argument that contains a space
        String[] commands = new String[]{"grep", "hello world", "/tmp/f.txt"};
        commands = new String[]{"grep", "hello world", "c://Documents and Settings//f.txt"};
        Process child = Runtime.getRuntime().exec(commands);
    } catch (IOException e) {
    }
2：Reading Output from a Command

try {
        // Execute command
        String command = "ls";
        Process child = Runtime.getRuntime().exec(command);
    
        // Get the input stream and read from it
        InputStream in = child.getInputStream();
        int c;
        while ((c = in.read()) != -1) {
            process((char)c);
        }
        in.close();
    } catch (IOException e) {
    }
3：Sending Input to a Command

try {
        // Execute command
        String command = "cat";
        Process child = Runtime.getRuntime().exec(command);
    
        // Get output stream to write from it
        OutputStream out = child.getOutputStream();
    
        out.write("some text".getBytes());
        out.close();
    } catch (IOException e) {
    }