I have a new environment, and I'm trying to make a simple java project in IntelliJ containing a ScoreCalculator.java class that will import com.google.gson. This should be simple but there's something I'm missing.
I made a fresh maven project (including this dependency in pom.xml), and when I try javac ScoreCalculator.java
I get: error: package com.google.gson.stream does not exist
Reading around, I found the jar file where this son-2.8.6.jar file lives (inside my .m2 directory), and I updated my CLASSPATH to be that folder path:
Dianes-MBP:java dkaplan$ echo $CLASSPATH
/Users/dkaplan/.m2/repository/com/google/code/gson/gson/2.8.6
My pom file has:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>mightier-maven</artifactId>
<version>1.0-SNAPSHOT</version>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>7</source>
<target>7</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.6</version>
</dependency>
</dependencies>
</project>
My little test program so far has nothing but the imports I'll need:
import java.io.File;
import java.io.FileReader;
import java.nio.file.Path;
import com.google.gson.*;
import com.google.gson.stream.JsonReader;
public class ScoreCalculator {
public static void main(String args[]){
System.out.println("Hello world");
}
}
The directory setup looks like this:
But when I try compiling this way I get the error:
Dianes-MBP:java dkaplan$ javac ScoreCalculator.java
ScoreCalculator.java:5: error: package com.google.gson.stream does not exist
import com.google.gson.stream.JsonReader;
^
ScoreCalculator.java:4: error: package com.google.gson does not exist
import com.google.gson.*;
^
2 errors
Note: I also tried the same thing with a fresh Gradle project in IntelliJ and I get the same error from the same command, so I'm thinking there's some setup (or directory organization?) piece I'm missing here.
What else should I do/check?
从 MacOS 中ScoreCalculator.java
所在的目录执行这些命令。
javac -cp /Users/dkaplan/.m2/repository/com/google/code/gson/gson/2.8.6/gson-2.8.6.jar ScoreCalculator.java
java -cp /Users/dkaplan/.m2/repository/com/google/code/gson/gson/2.8.6/gson-2.8.6.jar ScoreCalculator
use this dependency
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>20090211</version>
</dependency>
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