使用vscode进行java开发
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在 vscode
上快速开发 java
我们需要先搭建环境,比如 java
, maven
等
注册 oracle
账号用户 jdk
下载
下载 jdk
新建一个目录用于安装 jdk
,将 jdk
解压复制到文件夹内
# username为当前用户
mkdir /home/username/java
设置环境变量
sudo vim /etc/profile
# 将以下内容加到最后
set java environment
JAVA_HOME=/home/username/java/jdk1.8.0_231
JRE_HOME=/home/username/java/jdk1.8.0_231/jre
CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
export JAVA_HOME JRE_HOME CLASS_PATH PATH
让环境变量生效
source /etc/profile
测试
java -version
新建一个目录用户安装 maven
,将文件解压复制到文件夹内
# username 为当前用户
mkdir /home/MuYi086/maven
设置环境变量
sudo vim /etc/profile
# 将以下内容加到最后:注意之前java的export调整了
JAVA_HOME=/home/MuYi086/program/jdk1.8.0_231
JRE_HOME=/home/MuYi086/program/jdk1.8.0_231/jre
CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
MAVEN_HOME=/home/MuYi086/program/maven-3.6.2
PATH=${PATH}:${MAVEN_HOME}/bin
export JAVA_HOME JRE_HOME CLASS_PATH PATH MAVEN_HOME
让环境变量生效
source /etc/profile
测试
mvn -v
安装扩展 Java Extension Pack
和 Spring Boot Extension Pack
配置 maven
# file => Prefernces => settins => 搜索maven
填入配置( java
和 maven
目录及版本自行替换)
{
"workbench.iconTheme": "vscode-icons",
"workbench.startupEditor": "newUntitledFile",
"java.errors.incompleteClasspath.severity": "ignore",
"workbench.colorTheme": "Atom One Dark",
"java.home":"/home/MuYi086/program/jdk1.8.0_231",
"java.configuration.maven.userSettings": "/home/MuYi086/program/maven-3.6.2/conf/settings.xml",
"maven.executable.path": "/home/MuYi086/program/maven-3.6.2/bin/mvn",
"maven.terminal.useJavaHome": true,
"maven.terminal.customEnv": [
{
"environmentVariable": "JAVA_HOME",
"value": "/home/MuYi086/program/jdk1.8.0_231"
}
],
}
View => Command Palette
::: code-group
package com.MuYi086.myapp;
import java.sql.*;
public class App {
static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
static final String url = "jdbc:mysql://localhost:3306/test";
// 数据库的用户名与密码,需要根据自己的设置
static final String user = "MuYi086";
static final String password = "MuYi086";
public static void main( String[] args ) {
Connection conn = null;
Statement stmt = null;
try{
// 注册 JDBC 驱动
Class.forName(JDBC_DRIVER);
// 打开链接
System.out.println("连接数据库...");
conn = DriverManager.getConnection(url, user, password);
// 执行查询
System.out.println(" 实例化Statement对象...");
stmt = conn.createStatement();
String sql;
sql = "SELECT * FROM user";
ResultSet rs = stmt.executeQuery(sql);
// 展开结果集数据库
while(rs.next()){
// 通过字段检索
int height = rs.getInt("height");
String name = rs.getString("name");
System.out.println(String.format("height=%d, name=%s", height, name));
}
// 完成后关闭
rs.close();
stmt.close();
conn.close();
}catch(SQLException se){
// 处理 JDBC 错误
se.printStackTrace();
}catch(Exception e){
// 处理 Class.forName 错误
e.printStackTrace();
}finally{
// 关闭资源
try{
if(stmt!=null) stmt.close();
}catch(SQLException se2){
}// 什么都不做
try{
if(conn!=null) conn.close();
}catch(SQLException se){
se.printStackTrace();
}
}
System.out.println("Goodbye!");
}
}
:::
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