使用maven导入jar包

我们都经历过自己写代码时有时就要引用一些第三方的jar包，这个我们都会，但在公司里进行团队开发时，是不允许我们自己导入jar包的，是由项目组长之类的统一导入jar包，我们在这里来了解一下这个过程： a、先创建一个maven工程，在pom.xml中有这样一段代码：

<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/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.jd</groupId> <artifactId>dddmaven</artifactId> <packaging>war</packaging> <version>0.0.1-SNAPSHOT</version> <name>dddmaven Maven Webapp</name> <url>http://maven.apache.org</url> <dependencies> </dependencies> </project>

b、然后我们就在<dependencies></dependencies>中间添加相应的jar包的坐标<dependency></dependency>即可 其中jar包的坐标可以在这个网站上去找Maven Repository:Search/Browse/Explore

在这里写几个常用的jar包的坐标：

Junit:Test测试

<dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency>

Servlet:前端控制器

<dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> <scope>provided</scope> </dependency>

log4j:异常收集

<dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency>

slf4j：

<dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.6.4</version> </dependency>

slf4j-log4j12:

<dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.6.4</version> <scope>test</scope> </dependency>

如果用slf4j-log4j12出现以下情况： 则在pom.xml里插入以下配置：

<dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-nop</artifactId> <version>1.7.2</version> </dependency>

mysql:驱动

<dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.38</version> </dependency>

c、还有就是有些maven工程的版本较低（可能是1.5），可以升级到1.8，也是在pom.xml中最后（</project>之前）添加一些配置信息：

<profiles> <profile> <id>jdk1.8</id> <activation> <activeByDefault>true</activeByDefault> <jdk>1.8</jdk> </activation> <properties> <maven.compiler.source>1.8</maven.compiler.source> <maven.compiler.target>1.8</maven.compiler.target> <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion> </properties> </profile> </profiles>

然后再升级一下就可以了： 或者在<build></build>里加一下东西：

<plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> </plugins>

然后升级maven项目就可以了 补充：

验证码(patchca)：

<!-- https://mvnrepository.com/artifact/net.pusuo/patchca --> <dependency> <groupId>net.pusuo</groupId> <artifactId>patchca</artifactId> <version>0.5.0</version> </dependency>

Gson：

<dependency> <groupId>com.google.code.gson</groupId> <artifactId>gson</artifactId> <version>2.8.4</version> </dependency>

jstl & taglibs：

<dependency> <groupId>jstl</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <dependency> <groupId>taglibs</groupId> <artifactId>standard</artifactId> <version>1.1.2</version> </dependency>

上传文件：

<dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.4</version> </dependency> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.1</version> </dependency>

jsp:

<dependency> <groupId>javax.servlet</groupId> <artifactId>jsp-api</artifactId> <version>2.0</version> <scope>provided</scope> </dependency>

Spring框架：

<!-- spring3 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>3.1.2.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>3.1.2.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>3.1.2.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-expression</artifactId> <version>3.1.2.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>4.3.10.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>4.3.10.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>3.1.2.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-expression</artifactId> <version>3.1.2.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-orm</artifactId> <version>3.1.2.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>3.1.2.RELEASE</version> </dependency>

Jackson（用于将字符串转换成json格式，为了兼顾低版本浏览器）：

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind --> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.6.3</version> </dependency>