use command cli to parse args

src/com/gabongao/jvm/Cmd.java

@@ -0,0 +1,119 @@
+package com.gabongao.jvm;
+
+import org.apache.commons.cli.*;
+
+/**
+ * 　　　　　　　　┏┓　　　┏┓+ +
+ * 　　　　　　　┏┛┻━━━┛┻┓ + +
+ * 　　　　　　　┃　　　　　　　┃
+ * 　　　　　　　┃　　　━　　　┃ ++ + + +
+ * 　　　　　　 ████━████ ┃+
+ * 　　　　　　　┃　　　　　　　┃ +
+ * 　　　　　　　┃　　　┻　　　┃
+ * 　　　　　　　┃　　　　　　　┃ + +
+ * 　　　　　　　┗━┓　　　┏━┛
+ * 　　　　　　　　　┃　　　┃
+ * 　　　　　　　　　┃　　　┃ + + + +
+ * 　　　　　　　　　┃　　　┃　　　　Code is far away from bug with the animal protecting
+ * 　　　　　　　　　┃　　　┃ + 　　　　神兽保佑,代码无bug
+ * 　　　　　　　　　┃　　　┃
+ * 　　　　　　　　　┃　　　┃　　+
+ * 　　　　　　　　　┃　 　　┗━━━┓ + +
+ * 　　　　　　　　　┃ 　　　　　　　┣┓
+ * 　　　　　　　　　┃ 　　　　　　　┏┛
+ * 　　　　　　　　　┗┓┓┏━┳┓┏┛ + + + +
+ * 　　　　　　　　　　┃┫┫　┃┫┫
+ * 　　　　　　　　　　┗┻┛　┗┻┛+ + + +
+ * Created by Imgaojp on 2017/2/16.
+ */
+public class Cmd {
+
+    boolean helpFlag = false;
+    boolean versionFlag = false;
+    String cpOption = "";
+    String className = "";
+    String[] args;
+
+    /**
+     * getter
+     *
+     * @return
+     */
+    public boolean isHelpFlag() {
+        return helpFlag;
+    }
+
+    public boolean isVersionFlag() {
+        return versionFlag;
+    }
+
+    public String getCpOption() {
+        return cpOption;
+    }
+
+    public String getClassName() {
+        return className;
+    }
+
+    public String[] getArgs() {
+        return args;
+    }
+
+    /**
+     * reset properties
+     */
+    public void reset() {
+        this.helpFlag = false;
+        this.versionFlag = false;
+        this.cpOption = "";
+        this.className = "";
+        this.args = null;
+    }
+
+    /**
+     * ParseCmd
+     *
+     * @param args
+     * @throws Exception
+     */
+    public void parseCmd(String[] args) throws Exception {
+        CommandLineParser parser = new BasicParser();
+        Options options = new Options();
+        options.addOption("version", false, "print version and exit");
+        options.addOption("?", "help", false, "print help message");
+        options.addOption("cp", "classpath", true, "classpath");
+        CommandLine commandLine = parser.parse(options, args);
+        if (commandLine.hasOption("help") || commandLine.hasOption("?")) {
+            this.helpFlag = true;
+        }
+        if (commandLine.hasOption("version")) {
+            this.versionFlag = true;
+        }
+
+        if (commandLine.hasOption("cp") || commandLine.hasOption("classpath")) {
+            if (commandLine.hasOption("cp")) {
+                this.cpOption = commandLine.getOptionValue("cp");
+            } else {
+                this.cpOption = commandLine.getOptionValue("classpath");
+            }
+        }
+        String[] commandLineArgs = commandLine.getArgs();
+        if (commandLineArgs.length > 0) {
+            this.className = commandLineArgs[0];
+        }
+        if (commandLineArgs.length > 1) {
+            this.args = new String[commandLineArgs.length - 1];
+            System.arraycopy(commandLineArgs, 1, this.args, 0, commandLineArgs.length - 1);
+        }
+    }
+
+    /**
+     * 打印帮助
+     *
+     * @param args
+     */
+    public static void printUsage(String[] args) {
+        System.out.println("Usage: java [-options] class [args...]\n");
+    }
+
+}

src/test/com/gabongao/jvm/CmdTest.java

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+package test.com.gabongao.jvm; 
+
+import com.gabongao.jvm.Cmd;
+import org.junit.Test;
+import org.junit.Before; 
+import org.junit.After;
+import junit.framework.*;
+
+import java.util.Arrays;
+
+/** 
+* Cmd Tester. 
+* 
+* @author <Authors name> 
+* @since <pre>¶þÔÂ 17, 2017</pre> 
+* @version 1.0 
+*/ 
+public class CmdTest extends TestCase {
+
+@Before
+public void before() throws Exception { 
+} 
+
+@After
+public void after() throws Exception { 
+} 
+
+/** 
+* 
+* Method: parseCmd(String[] args) 
+* 
+*/ 
+@Test
+public void testParseCmd() throws Exception { 
+//TODO: Test goes here...
+    Cmd cmd = new Cmd();
+    cmd.parseCmd(new String[]{"-cp","classpath1","MyApp"});
+    assertEquals("classpath1",cmd.getCpOption());
+    assertEquals("MyApp",cmd.getClassName());
+    cmd.reset();
+
+    cmd.parseCmd(new String[]{"-version","MyApp","classpath1","args2"});
+    assertEquals(false,cmd.isHelpFlag());
+    assertEquals(true,cmd.isVersionFlag());
+    assertEquals("MyApp",cmd.getClassName());
+    assertEquals(true, Arrays.asList(new String[]{"classpath1", "args2"}).equals(Arrays.asList(cmd.getArgs())));
+    assertEquals("",cmd.getCpOption());
+    cmd.reset();
+
+    cmd.parseCmd(new String[]{"-help","MyApp","classpath1","args2"});
+    assertEquals("",cmd.getCpOption());
+    assertEquals(true,cmd.isHelpFlag());
+    assertEquals(false,cmd.isVersionFlag());
+    assertEquals(true, Arrays.asList(new String[]{"classpath1", "args2"}).equals(Arrays.asList(cmd.getArgs())));
+    assertEquals("MyApp",cmd.getClassName());
+    cmd.reset();
+
+    cmd.parseCmd(new String[]{"-?","MyApp","classpath1","args2"});
+    assertEquals("",cmd.getCpOption());
+    assertEquals(true,cmd.isHelpFlag());
+    assertEquals(false,cmd.isVersionFlag());
+    assertEquals(true, Arrays.asList(new String[]{"classpath1", "args2"}).equals(Arrays.asList(cmd.getArgs())));
+    assertEquals("MyApp",cmd.getClassName());
+    cmd.reset();
+
+
+    cmd.parseCmd(new String[]{"-classpath","classpath1","MyApp","args1","args2"});
+    assertEquals("classpath1",cmd.getCpOption());
+    assertEquals(false,cmd.isHelpFlag());
+    assertEquals(false,cmd.isVersionFlag());
+    assertEquals(true, Arrays.asList(new String[]{"args1", "args2"}).equals(Arrays.asList(cmd.getArgs())));
+    assertEquals("MyApp",cmd.getClassName());
+    cmd.reset();
+
+    cmd.parseCmd(new String[]{"-classpath","classpath1","MyApp","args1","args2","-version"});
+    assertEquals("classpath1",cmd.getCpOption());
+    assertEquals(false,cmd.isHelpFlag());
+    assertEquals(true,cmd.isVersionFlag());
+    assertEquals(true, Arrays.asList(new String[]{"args1", "args2"}).equals(Arrays.asList(cmd.getArgs())));
+    assertEquals("MyApp",cmd.getClassName());
+    cmd.reset();
+
+
+    cmd.parseCmd(new String[]{"-classpath","classpath1","-version","MyApp","args1","args2"});
+    assertEquals("classpath1",cmd.getCpOption());
+    assertEquals(false,cmd.isHelpFlag());
+    assertEquals(true,cmd.isVersionFlag());
+    assertEquals(true, Arrays.asList(new String[]{"args1", "args2"}).equals(Arrays.asList(cmd.getArgs())));
+    assertEquals("MyApp",cmd.getClassName());
+    cmd.reset();
+
+    cmd.parseCmd(new String[]{"-classpath","classpath1","MyApp","-version","args1","args2"});
+    assertEquals("classpath1",cmd.getCpOption());
+    assertEquals(false,cmd.isHelpFlag());
+    assertEquals(true,cmd.isVersionFlag());
+    assertEquals(true, Arrays.asList(new String[]{"args1", "args2"}).equals(Arrays.asList(cmd.getArgs())));
+    assertEquals("MyApp",cmd.getClassName());
+    cmd.reset();
+
+}
+
+/** 
+* 
+* Method: printUsage(String[] args) 
+* 
+*/ 
+@Test
+public void testPrintUsage() throws Exception { 
+//TODO: Test goes here... 
+} 
+
+
+}