Merge pull request onlyliuxin#30 from chaoswang/master

更新四次作业博客

group06/263050006/article.txt

@@ -1,2 +1,12 @@
-CPU、内存、硬盘、指令以及他们之间的关系
-https://zhuanlan.zhihu.com/p/25442061
+第一次作业博客：
+CPU、内存、硬盘、指令以及他们之间的关系
+https://zhuanlan.zhihu.com/p/25442061
+第二次作业博客：
+为什么32位处理器只能配4G内存
+https://zhuanlan.zhihu.com/p/26174778
+第三次作业博客：
+报文和帧
+https://zhuanlan.zhihu.com/p/26175504
+第四次作业博客：
+依赖注入通俗解释
+https://zhuanlan.zhihu.com/p/26176550

group06/263050006/pom.xml

@@ -0,0 +1,63 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>com.github.chaoswang</groupId>
+  <artifactId>coding2017</artifactId>
+  <version>0.0.1-SNAPSHOT</version>
+  <name>coding2017</name>
+  <description>coding2017</description>
+  <build>
+    <sourceDirectory>coding2017/group06/263050006/src/main/java</sourceDirectory>
+    <testSourceDirectory>coding2017/group06/263050006/src/test/java</testSourceDirectory>
+    <resources>
+      <resource>
+        <directory>coding2017/group06/263050006/src/main/java</directory>
+        <excludes>
+          <exclude>**/*.java</exclude>
+        </excludes>
+      </resource>
+    </resources>
+    <plugins>
+      <plugin>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>3.3</version>
+        <configuration>
+          <source>1.8</source>
+          <target>1.8</target>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+
+   <dependencies>
+
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.12</version>
+      <scope>test</scope>
+    </dependency>
+
+    <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 -->
+	<dependency>
+	    <groupId>org.apache.commons</groupId>
+	    <artifactId>commons-lang3</artifactId>
+	    <version>3.5</version>
+	</dependency>
+
+    <!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
+	<dependency>
+	    <groupId>commons-io</groupId>
+	    <artifactId>commons-io</artifactId>
+	    <version>2.5</version>
+	</dependency>
+
+    <!-- https://mvnrepository.com/artifact/jdom/jdom -->
+	<dependency>
+	    <groupId>jdom</groupId>
+	    <artifactId>jdom</artifactId>
+	    <version>1.1</version>
+	</dependency>
+
+
+  </dependencies>
+</project>

group06/263050006/src/main/java/com/github/chaoswang/learning/java/downloader/impl/ConnectionImpl.java

@@ -40,7 +40,8 @@ public byte[] read(int startPos, int endPos) throws IOException {
         ByteArrayOutputStream bos = new ByteArrayOutputStream();    
 		int len = 0;    
 		int hasRead = 0;
-        while((len < currentSectionLength) && ((hasRead = is.read(buffer)) != -1)) {    
+        while((len < currentSectionLength) && ((hasRead = is.read(buffer)) != -1)) { 
+        	System.out.println(buffer.length);
             bos.write(buffer, 0, hasRead);  
             len += hasRead;
         }    

group06/263050006/src/main/java/com/github/chaoswang/learning/java/jvm/attr/AttributeInfo.java

@@ -0,0 +1,19 @@
+package com.github.chaoswang.learning.java.jvm.attr;
+
+public abstract class AttributeInfo {
+	public static final String CODE = "Code";
+	public static final String CONST_VALUE = "ConstantValue";
+	public static final String EXCEPTIONS = "Exceptions";
+	public static final String LINE_NUM_TABLE = "LineNumberTable";
+	public static final String LOCAL_VAR_TABLE = "LocalVariableTable";
+	public static final String STACK_MAP_TABLE = "StackMapTable";
+	int attrNameIndex;
+	int attrLen;
+
+	public AttributeInfo(int attrNameIndex, int attrLen) {
+
+		this.attrNameIndex = attrNameIndex;
+		this.attrLen = attrLen;
+	}
+
+}

group06/263050006/src/main/java/com/github/chaoswang/learning/java/jvm/attr/CodeAttr.java

@@ -0,0 +1,50 @@
+package com.github.chaoswang.learning.java.jvm.attr;
+
+import com.github.chaoswang.learning.java.jvm.clz.ClassFile;
+import com.github.chaoswang.learning.java.jvm.loader.ByteCodeIterator;
+
+public class CodeAttr extends AttributeInfo {
+	private int maxStack ;
+	private int maxLocals ;
+	private int codeLen ;
+	private String code;
+	public String getCode() {
+		return code;
+	}
+
+	//private ByteCodeCommand[] cmds ;
+	//public ByteCodeCommand[] getCmds() {
+	//	return cmds;
+	//}
+	private LineNumberTable lineNumTable;
+	private LocalVariableTable localVarTable;
+	private StackMapTable stackMapTable;
+
+	public CodeAttr(int attrNameIndex, int attrLen, int maxStack, int maxLocals, int codeLen,String code /*ByteCodeCommand[] cmds*/) {
+		super(attrNameIndex, attrLen);
+		this.maxStack = maxStack;
+		this.maxLocals = maxLocals;
+		this.codeLen = codeLen;
+		this.code = code;
+		//this.cmds = cmds;
+	}
+
+	public void setLineNumberTable(LineNumberTable t) {
+		this.lineNumTable = t;
+	}
+
+	public void setLocalVariableTable(LocalVariableTable t) {
+		this.localVarTable = t;		
+	}
+
+	public static CodeAttr parse(ClassFile clzFile, ByteCodeIterator iter){
+
+
+		return null;
+	}
+	private void setStackMapTable(StackMapTable t) {
+		this.stackMapTable = t;
+
+	}
+
+}

group06/263050006/src/main/java/com/github/chaoswang/learning/java/jvm/attr/LineNumberTable.java

@@ -0,0 +1,45 @@
+package com.github.chaoswang.learning.java.jvm.attr;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.github.chaoswang.learning.java.jvm.loader.ByteCodeIterator;
+
+public class LineNumberTable extends AttributeInfo {
+	List<LineNumberItem> items = new ArrayList<LineNumberItem>();
+
+	private static class LineNumberItem {
+		int startPC;
+		int lineNum;
+
+		public int getStartPC() {
+			return startPC;
+		}
+
+		public void setStartPC(int startPC) {
+			this.startPC = startPC;
+		}
+
+		public int getLineNum() {
+			return lineNum;
+		}
+
+		public void setLineNum(int lineNum) {
+			this.lineNum = lineNum;
+		}
+	}
+
+	public void addLineNumberItem(LineNumberItem item) {
+		this.items.add(item);
+	}
+
+	public LineNumberTable(int attrNameIndex, int attrLen) {
+		super(attrNameIndex, attrLen);
+
+	}
+
+	public static LineNumberTable parse(ByteCodeIterator iter) {
+
+		return null;
+	}
+}

group06/263050006/src/main/java/com/github/chaoswang/learning/java/jvm/attr/LocalVariableItem.java

@@ -0,0 +1,49 @@
+package com.github.chaoswang.learning.java.jvm.attr;
+
+public class LocalVariableItem {
+	private int startPC;
+	private int length;
+	private int nameIndex;
+	private int descIndex;
+	private int index;
+
+	public int getStartPC() {
+		return startPC;
+	}
+
+	public void setStartPC(int startPC) {
+		this.startPC = startPC;
+	}
+
+	public int getLength() {
+		return length;
+	}
+
+	public void setLength(int length) {
+		this.length = length;
+	}
+
+	public int getNameIndex() {
+		return nameIndex;
+	}
+
+	public void setNameIndex(int nameIndex) {
+		this.nameIndex = nameIndex;
+	}
+
+	public int getDescIndex() {
+		return descIndex;
+	}
+
+	public void setDescIndex(int descIndex) {
+		this.descIndex = descIndex;
+	}
+
+	public int getIndex() {
+		return index;
+	}
+
+	public void setIndex(int index) {
+		this.index = index;
+	}
+}

group06/263050006/src/main/java/com/github/chaoswang/learning/java/jvm/attr/LocalVariableTable.java

@@ -0,0 +1,23 @@
+package com.github.chaoswang.learning.java.jvm.attr;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.github.chaoswang.learning.java.jvm.loader.ByteCodeIterator;
+
+public class LocalVariableTable extends AttributeInfo{
+
+	List<LocalVariableItem> items = new ArrayList<LocalVariableItem>();
+
+	public LocalVariableTable(int attrNameIndex, int attrLen) {
+		super(attrNameIndex, attrLen);		
+	}
+
+	public static LocalVariableTable parse(ByteCodeIterator iter){
+
+		return null;
+	}
+	private void addLocalVariableItem(LocalVariableItem item) {
+		this.items.add(item);		
+	}
+}

group06/263050006/src/main/java/com/github/chaoswang/learning/java/jvm/attr/StackMapTable.java

@@ -0,0 +1,29 @@
+package com.github.chaoswang.learning.java.jvm.attr;
+
+import com.github.chaoswang.learning.java.jvm.loader.ByteCodeIterator;
+
+public class StackMapTable extends AttributeInfo{
+
+	private String originalCode;
+
+	public StackMapTable(int attrNameIndex, int attrLen) {
+		super(attrNameIndex, attrLen);		
+	}
+
+	public static StackMapTable parse(ByteCodeIterator iter){
+		int index = iter.nextU2ToInt();
+		int len = iter.nextU4ToInt();
+		StackMapTable t = new StackMapTable(index,len);
+
+		//后面的StackMapTable太过复杂， 不再处理， 只把原始的代码读进来保存
+		String code = iter.nextUxToHexString(len);
+		t.setOriginalCode(code);
+
+		return t;
+	}
+
+	private void setOriginalCode(String code) {
+		this.originalCode = code;
+
+	}
+}

group06/263050006/src/main/java/com/github/chaoswang/learning/java/jvm/clz/AccessFlag.java

@@ -0,0 +1,26 @@
+package com.github.chaoswang.learning.java.jvm.clz;
+
+public class AccessFlag {
+	private int flagValue;
+
+	public AccessFlag(int value) {
+		this.flagValue = value;
+	}
+
+	public int getFlagValue() {
+		return flagValue;
+	}
+
+	public void setFlagValue(int flag) {
+		this.flagValue = flag;
+	}
+
+	public boolean isPublicClass() {
+		return (this.flagValue & 0x0001) != 0;
+	}
+
+	public boolean isFinalClass() {
+		return (this.flagValue & 0x0010) != 0;
+	}
+
+}