JAVA代码执行shell命令 并解析
http://www.2cto.com/kf/201201/117397.html
在Android可能有的系统信息没有直接提供API接口来访问，为了获取系统信息时我们就要在用shell指令来获取信息，这时我们可以在代码中来执行命令 ，这里主要用到ProcessBuilder 这个类.
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代码部分? ：
[java]
package com.yin.system_analysis;?
import java.io.File;?
import java.io.IOException;?
import java.io.InputStream;?
import android.app.Activity;?
import android.os.Bundle;?
import android.util.Log;?
import android.view.View;?
import android.view.View.OnClickListener;?
import android.widget.Button;?
import android.widget.TextView;?
public class MainActivity extends Activity {?
??? private final static String[] ARGS = {"ls","-l"};?
??? private final static String TAG = "com.yin.system";?
??? Button mButton;?
??? TextView myTextView;?
??? public void onCreate(Bundle savedInstanceState) {?
??????? super.onCreate(savedInstanceState);?
??????? setContentView(R.layout.main);?
??????? mButton = (Button) findViewById(R.id.myButton);?
??????? myTextView = (TextView) findViewById(R.id.textView);?
?????????
??????? mButton.setOnClickListener(new OnClickListener() {?
?????????????
??????????? public void onClick(View v) {?
?????????????????
??????????????? myTextView.setText(getResult());?
??????????? }?
??????? });?
??? }?
??? public String getResult(){?
???????? ShellExecute cmdexe = new ShellExecute ( );?
???????? String result="";?
???????? try {?
??????????? result = cmdexe.execute(ARGS, "/");?
??????? } catch (IOException e) {?
??????????? Log.e(TAG, "IOException");?
??????????? e.printStackTrace();?
??????? }?
??????? return result;?
??? }?
??? private class ShellExecute {?
??????? /*
???????? * args[0] : shell 命令? 如"ls" 或"ls -1";
???????? * args[1] : 命令执行路径? 如"/" ;
???????? */?
??????? public String execute ( String [] cmmand,String directory)?
??????? throws IOException {?
??????? String result = "" ;?
??????? try {?
??????? ProcessBuilder builder = new ProcessBuilder(cmmand);?
?????????
??????? if ( directory != null )?
??????? builder.directory ( new File ( directory ) ) ;?
??????? builder.redirectErrorStream (true) ;?
??????? Process process = builder.start ( ) ;?
?????????
??????? //得到命令执行后的结果?
??????? InputStream is = process.getInputStream ( ) ;?
??????? byte[] buffer = new byte[1024] ;?
??????? while ( is.read(buffer) != -1 ) {?
??????? result = result + new String (buffer) ;?
??????? }?
??????? is.close ( ) ;?
??????? } catch ( Exception e ) {?
??????????? e.printStackTrace ( ) ;?
??????? }?
??????? return result ;?
??????? }?
??? }?
}?
