解决eclipse+MAVEN提示One or more constraints have not been satisfied.的问题

解决方案：

在pom.xml中添加下面内容即可，同时也可以解决Maven->update project默认jdk的问题

	<profiles>
		<profile>
			<id>jdk-1.7</id>
			<!-- 另外一种激活方式 -->
			<activation>
				<activeByDefault>true</activeByDefault>
				<jdk>1.7</jdk>
			</activation>
			<properties>
				<maven.compiler.source>1.7</maven.compiler.source>
				<maven.compiler.target>1.7</maven.compiler.target>
				<maven.compiler.compilerVersion>1.7</maven.compiler.compilerVersion>
			</properties>
		</profile>
	</profiles>

　　

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