Merge pull request #33 from szlele/master

3月26日作业

group10/595128841/src/main/java/org/le/d/ClassFileLoader.java

@@ -0,0 +1,69 @@
+package org.le.d;
+
+import java.io.DataInputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FilenameFilter;
+import java.util.ArrayList;
+import java.util.List;
+
+
+
+public class ClassFileLoader {
+
+	private List<String> clzPaths = new ArrayList<String>();
+
+	public byte[] readBinaryCode(String className) {
+		File file = null;
+		final String classAllName = className.replace(".", File.separator) + ".class";
+		for(String path : clzPaths){
+			File filePath = new File(path);
+			if(filePath.isDirectory()){
+				File[] fileList = filePath.listFiles(new FilenameFilter(){
+					@Override
+					public boolean accept(File dir, String name) {
+						String filePath = dir.getPath()+File.separator+name;
+						return filePath.contains(classAllName);
+					}
+				});
+				if(fileList.length > 0){
+					file = fileList[0];
+					break;
+				}
+			}
+		}
+		if(file != null){
+			try (
+					DataInputStream in = new DataInputStream(new FileInputStream(file));
+					){
+				byte[] buf = new byte[(int) file.length()];
+				in.readFully(buf);
+				return buf;
+			} catch (Exception e) {
+				e.printStackTrace();
+			}
+		}
+		return null;	
+
+
+	}
+
+	public void addClassPath(String path) {
+		clzPaths.add(path);
+	}
+
+
+
+	public String getClassPath(){
+		StringBuilder str = new StringBuilder();
+		for(String s : clzPaths){
+			str.append(';').append(s);
+		}
+		return str.length() > 0 ?str.substring(1):"";
+	}
+
+
+
+
+
+}

group10/595128841/src/main/java/org/le/d/ClassFileloaderTest.java

@@ -0,0 +1,87 @@
+package org.le.d;
+
+import org.junit.After;
+import  org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+
+public class ClassFileloaderTest {
+
+
+	static String path1 = "C:\\work\\workspace\\coding2017\\coding2017\\group10\\595128841\\src\\main\\java\\org\\le\\d";
+	static String path2 = "C:\\temp";
+
+
+
+	@Before
+	public void setUp() throws Exception {		 
+	}
+
+	@After
+	public void tearDown() throws Exception {
+	}
+
+	@Test
+	public void testClassPath(){		
+
+		ClassFileLoader loader = new ClassFileLoader();
+		loader.addClassPath(path1);
+		loader.addClassPath(path2);
+
+		String clzPath = loader.getClassPath();
+
+		Assert.assertEquals(path1+";"+path2,clzPath);
+
+	}
+
+	@Test
+	public void testClassFileLength() {		
+
+		ClassFileLoader loader = new ClassFileLoader();
+		loader.addClassPath(path1);
+
+		String className = "org.le.d.EmployeeV1";
+
+		byte[] byteCodes = loader.readBinaryCode(className);
+
+		// 注意：这个字节数可能和你的JVM版本有关系， 你可以看看编译好的类到底有多大
+		Assert.assertEquals(801, byteCodes.length);
+
+	}
+
+
+    @Test	
+	public void testMagicNumber(){
+    	ClassFileLoader loader = new ClassFileLoader();
+		loader.addClassPath(path1);
+		String className = "org.le.d.EmployeeV1";
+		byte[] byteCodes = loader.readBinaryCode(className);
+		byte[] codes = new byte[]{byteCodes[0],byteCodes[1],byteCodes[2],byteCodes[3]};
+
+
+		String acctualValue = this.byteToHexString(codes);
+
+		Assert.assertEquals("cafebabe", acctualValue);
+	}
+
+
+
+
+
+
+	private String byteToHexString(byte[] codes ){
+		StringBuffer buffer = new StringBuffer();
+		for(int i=0;i<codes.length;i++){
+			byte b = codes[i];
+			int value = b & 0xFF;
+			String strHex = Integer.toHexString(value);
+			if(strHex.length()< 2){
+				strHex = "0" + strHex;
+			}		
+			buffer.append(strHex);
+		}
+		return buffer.toString();
+	}
+
+}

group10/595128841/src/main/java/org/le/d/EmployeeV1.java

@@ -0,0 +1,28 @@
+package org.le.d;
+
+public class EmployeeV1 {
+
+
+	private String name;
+    private int age;
+
+    public EmployeeV1(String name, int age) {
+        this.name = name;
+        this.age = age;        
+    }    
+
+    public void setName(String name) {
+        this.name = name;
+    }
+    public void setAge(int age){
+    	this.age = age;
+    }
+    public void sayHello() {        
+    	System.out.println("Hello , this is class Employee ");    	
+    }
+    public static void main(String[] args){
+    	EmployeeV1 p = new EmployeeV1("Andy",29);
+    	p.sayHello();    
+
+    }
+}

group10/595128841/src/main/java/org/le/d/LRUMap.java

@@ -0,0 +1,25 @@
+/**
+ * 
+ */
+package org.le.d;
+
+import java.util.LinkedHashMap;
+/**
+ * @author yue
+ * @time 2017年4月5日
+ */
+public class LRUMap<K,V> extends LinkedHashMap<K, V>{
+
+	private static final long serialVersionUID = -4435712528205829896L;
+	private int maxElements;
+
+	public LRUMap(int maxElements){
+		super(maxElements, 0.75F, true);
+		this.maxElements = maxElements;
+	}
+
+	@Override
+	protected boolean removeEldestEntry(java.util.Map.Entry<K, V> eldest) {
+		return size() > this.maxElements;
+	}
+}