Java实现一个简易的区块链（二）

学习目标：

实现二中主要对交易数据类型进行修改，包括交易数据链由String类型到对象数组类型；链的结构也进行了调整，除此之外，新增了交易的对象，目前项目已经实现总体数据结构，可以将几笔交易加入到交易池，节点进行挖矿，并将节点添加到链上。还在准备将数字签名算法secp256k1引入到该项目中，实现转账交易的功能。

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源代码

• maven中的pom文件

<?xml version="1.0" encoding="UTF-8"?>

<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>org.example</groupId>
  <artifactId>lambda</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>lambda Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>io.mateu</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.11.97</version>
    </dependency>


    <!-- https://mvnrepository.com/artifact/com.github.houbb/junitperf -->
    <dependency>
      <groupId>com.github.houbb</groupId>
      <artifactId>junitperf</artifactId>
      <version>2.0.0</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/commons-codec/commons-codec -->
    <dependency>
      <groupId>commons-codec</groupId>
      <artifactId>commons-codec</artifactId>
      <version>1.14</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.2.76</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.bouncycastle/bcprov-jdk15on -->
    <dependency>
      <groupId>org.bouncycastle</groupId>
      <artifactId>bcprov-jdk15on</artifactId>
      <version>1.68</version>
    </dependency>



  </dependencies>

  <build>
    <finalName>lambda</finalName>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.1.0</version>
        </plugin>
        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <v