进行多次测试后发现是因为没有正常退出进程,以及完全读取掉流数据,和关闭流导致的问题。
在多次优化后,建立如下封装类:
ProcessModel.java
- import java.io.BufferedReader;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.InputStreamReader;
- import java.io.OutputStream;
- /**
- * Create By Qiujuer
- * 2014-07-26
- * <p/>
- * 执行命令行语句静态方法封装
- */
- public class ProcessModel {
- //换行符
- private static final String BREAK_LINE;
- //执行退出命令
- private static final byte[] COMMAND_EXIT;
- //错误缓冲
- private static byte[] BUFFER;
- /**
- * 静态变量初始化
- */
- static {
- BREAK_LINE = "\n";
- COMMAND_EXIT = "\nexit\n".getBytes();
- BUFFER = new byte[32];
- }
- /**
- * 执行命令
- *
- * @param params 命令参数
- * <pre> eg: "/system/bin/ping", "-c", "4", "-s", "100","www.qiujuer.net"</pre>
- * @return 执行结果
- */
- public static String execute(String... params) {
- Process process = null;
- StringBuilder sbReader = null;
- BufferedReader bReader = null;
- InputStreamReader isReader = null;
- InputStream in = null;
- InputStream err = null;
- OutputStream out = null;
- try {
- process = new ProcessBuilder()
- .command(params)
- .start();
- out = process.getOutputStream();
- in = process.getInputStream();
- err = process.getErrorStream();
- out.write(COMMAND_EXIT);
- out.flush();
- process.waitFor();
- isReader = new InputStreamReader(in);
- bReader = new BufferedReader(isReader);
- String s;
- if ((s = bReader.readLine()) != null) {
- sbReader = new StringBuilder();
- sbReader.append(s);
- sbReader.append(BREAK_LINE);
- while ((s = bReader.readLine()) != null) {
- sbReader.append(s);
- sbReader.append(BREAK_LINE);
- }
- }
- while ((err.read(BUFFER)) > 0) {
- }
- } catch (IOException e) {
- e.printStackTrace();
- } catch (Exception e) {
- e.printStackTrace();
- } finally {
- closeAllStream(out, err, in, isReader, bReader);
- if (process != null) {
- processDestroy(process);
- process = null;
- }
- }
- if (sbReader == null)
- return null;
- else
- return sbReader.toString();
- }
- /**
- * 关闭所有流
- *
- * @param out 输出流
- * @param err 错误流
- * @param in 输入流
- * @param isReader 输入流封装
- * @param bReader 输入流封装
- */
- private static void closeAllStream(OutputStream out, InputStream err, InputStream in, InputStreamReader isReader, BufferedReader bReader) {
- if (out != null)
- try {
- out.close();
- } catch (IOException e) {
- e.printStackTrace();
- }
- if (err != null)
- try {
- err.close();
- } catch (IOException e) {
- e.printStackTrace();
- }
- if (in != null)
- try {
- in.close();
- } catch (IOException e) {
- e.printStackTrace();
- }
- if (isReader != null)
- try {
- isReader.close();
- } catch (IOException e) {
- e.printStackTrace();
- }
- if (bReader != null)
- try {
- bReader.close();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- /**
- * 通过Android底层实现进程关闭
- *
- * @param process 进程
- */
- private static void killProcess(Process process) {
- int pid = getProcessId(process);
- if (pid != 0) {
- try {
- //android kill process
- android.os.Process.killProcess(pid);
- } catch (Exception e) {
- try {
- process.destroy();
- } catch (Exception ex) {
- }
- }
- }
- }
- /**
- * 获取进程的ID
- *
- * @param process 进程
- * @return
- */
- private static int getProcessId(Process process) {
- String str = process.toString();
- try {
- int i = str.indexOf("=") + 1;
- int j = str.indexOf("]");
- strstr = str.substring(i, j);
- return Integer.parseInt(str);
- } catch (Exception e) {
- return 0;
- }
- }
- /**
- * 销毁进程
- *
- * @param process 进程
- */
- private static void processDestroy(Process process) {
- if (process != null) {
- try {
- //判断是否正常退出
- if (process.exitValue() != 0) {
- killProcess(process);
- }
- } catch (IllegalThreadStateException e) {
- killProcess(process);
- }
- }
- }
- }
在进行批量压力测试到达125643个线程的时候都没有出现此问题;特此分享给大家
本文链接:http://blog.csdn.net/qiujuer/article/details/38142273