java链码的编写很容易，如下2个：pom以及java代码：
<?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 "> <modelVersion>4.0.0</modelVersion> <groupId>mckay</groupId> <artifactId>test1</artifactId> <version>1.0-SNAPSHOT</version> <dependencies> <dependency> <groupId>org.hyperledger.fabric-chaincode-java</groupId> <artifactId>fabric-chaincode-shim</artifactId> <version>1.4.4</version> <exclusions> <exclusion> <groupId>com.github.everit-org.json-schema</groupId> <artifactId>org.everit.json.schema</artifactId> </exclusion> </exclusions> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.1</version> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-shade-plugin</artifactId> <version>3.1.0</version> <executions> <execution> <phase>package</phase> <goals> <goal>shade</goal> </goals> <configuration> <finalName>chaincode</finalName> <transformers> <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer"> <mainClass>tech.test1.MyChaincode</mainClass> </transformer> </transformers> <filters> <filter> <!-- filter out signature files from signed dependencies, else repackaging fails with security ex --> <artifact>*:*</artifact> <excludes> <exclude>META-INF/*.SF</exclude> <exclude>META-INF/*.DSA</exclude> <exclude>META-INF/*.RSA</exclude> </excludes> </filter> </filters> </configuration> </execution> </executions> </plugin> </plugins> </build> </project>