修改maven一更新jre就变成1.5版本

<build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.1</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

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

<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="         http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">  
  <!--本地仓库。该值表示构建系统本地仓库的路径。其默认值为~/.m2/repository。 -->  
  <localRepository>E:\softs\maven\repository</localRepository> 
  <!--Maven是否需要和用户交互以获得输入。如果Maven需要和用户交互以获得输入，则设置成true，反之则应为false。默认为true。  
 <interactiveMode>true</interactiveMode>  
 -->
<mirrors>
    <mirror>
      <id>alimaven</id>
      <name>aliyun maven</name>
      <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
      <mirrorOf>central</mirrorOf>        
    </mirror>
  </mirrors>
        

  <profiles> 
  <profile>
                <id>jdk-1.6</id>
            
                <activation>
                    <jdk>1.6</jdk>
                </activation>
            
                <repositories>
                    <repository>
                        <id>nexus</id>
                        <name>local private nexus</name>
                        <url>http://maven.oschina.net/content/groups/public/</url>
                        <releases>
                            <enabled>true</enabled>
                        </releases>
                        <snapshots>
                            <enabled>false</enabled>
                        </snapshots>
                    </repository>
                </repositories>
                <pluginRepositories>
                    <pluginRepository>
                        <id>nexus</id>
                        <name>local private nexus</name>
                        <url>http://maven.oschina.net/content/groups/public/</url>
                        <releases>
                            <enabled>true</enabled>
                        </releases>
                        <snapshots>
                            <enabled>false</enabled>
                        </snapshots>
                    </pluginRepository>
                </pluginRepositories>
            </profile>
  </profiles>  
  <!-- -->  
  <activeProfiles> 
    <activeProfile>nexus</activeProfile> 
  </activeProfiles> 
</settings>