java - spring工程引入ModelAndView 类报错，can not resolve ?

Question

写一个maven+spring的demo程序，但是引入ModelAndView类时报错，无法解析，导入其他类就没有问题，不知道错在哪里？

Answer 1

Let’s see if the situation is similar. I have imported: import com.alibaba.fastjson.JSON;I keep reporting errors, but the class file does not have a red xx:

I just modified the compiled jdk version of Maven. It seems that your jdk version has not been modified either:

<build>
    <plugins>
        <!-- Compiler 插件, 设定JDK版本 -->
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.5.1</version>
            <configuration>
                <source>1.7</source>
                <target>1.7</target>
                <showWarnings>true</showWarnings>
            </configuration>
        </plugin>
    </plugins>
</build>