先上POM表明环境：

<project><properties><!-- spring版本号 --><spring.version>4.0.8.RELEASE</spring.version><!-- junit版本号 --><junit.version>4.10</junit.version><!-- mybatis版本号 --><mybatis.version>3.2.8</mybatis.version><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding></properties><dependencies><!-- 添加Spring依赖 --><dependency><groupId>org.springframework</groupId><artifactId>spring-core</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context-support</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-aop</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-aspects</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-tx</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-web</artifactId><version>${spring.version}</version></dependency><!--spring-aop依赖 --><dependency><groupId>org.aspectj</groupId><artifactId>aspectjweaver</artifactId><version>1.8.2</version></dependency><!--单元测试依赖 --><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>${junit.version}</version><scope>test</scope></dependency><!--spring单元测试依赖 --><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>${spring.version}</version><scope>test</scope></dependency><!--mybatis依赖 --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>${mybatis.version}</version></dependency><!-- mybatis/spring包 --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>1.2.2</version></dependency><!-- mysql驱动包 --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.34</version></dependency><!-- javaee-api包 注意和项目使用的JDK版本对应 --><dependency><groupId>javax</groupId><artifactId>javaee-api</artifactId><version>7.0</version><scope>provided</scope></dependency><!-- javaee-web-api包 注意和项目使用的JDK版本对应 --><dependency><groupId>javax</groupId><artifactId>javaee-web-api</artifactId><version>7.0</version><scope>provided</scope></dependency><!-- JSP标准标签库 --><dependency><groupId>jstl</groupId><artifactId>jstl</artifactId><version>1.2</version></dependency><!-- quartz定时任务插件 --><dependency><groupId>org.quartz-scheduler</groupId><artifactId>quartz</artifactId><version>1.8.6</version></dependency><!-- 瓜娃子 --><dependency><groupId>com.google.guava</groupId><artifactId>guava</artifactId><version>18.0</version></dependency><!-- HTTP请求工具类 --><dependency><groupId>org.apache.httpcomponents</groupId><artifactId>httpclient</artifactId><version>4.5.2</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.35</version></dependency><dependency><groupId>commons-lang</groupId><artifactId>commons-lang</artifactId><version>2.6</version></dependency><!-- *****************************日志相关的组件 ***************************** --><!-- slf4j核心包 --><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-api</artifactId><version>1.7.13</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>jcl-over-slf4j</artifactId><version>1.7.13</version><scope>runtime</scope></dependency><!--核心log4j2jar包 --><dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-api</artifactId><version>2.4.1</version></dependency><dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-core</artifactId><version>2.4.1</version></dependency><!--用于与slf4j保持桥接 --><dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-slf4j-impl</artifactId><version>2.4.1</version></dependency><!--web工程需要包含log4j-web，非web工程不需要 --><dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-web</artifactId><version>2.4.1</version><scope>runtime</scope></dependency><!--需要使用log4j2的AsyncLogger需要包含disruptor --><dependency><groupId>com.lmax</groupId><artifactId>disruptor</artifactId><version>3.2.0</version></dependency><!-- *****************************日志相关的结束 ***************************** --><!-- excel工具类 --><dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>3.17</version></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>3.17</version></dependency><!--alibaba druid数据库连接池 --><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.0.11</version></dependency><!--分页插件 --><dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper</artifactId><version>5.0.0</version></dependency></dependencies><build><plugins><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-resources-plugin</artifactId><version>2.6</version></plugin><!-- compiler插件, 设定JDK版本 --><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><version>3.1</version><configuration><source>1.8</source><target>1.8</target><showWarnings>true</showWarnings></configuration></plugin><!-- war打包插件, 设定war包名称不带版本号 --><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-war-plugin</artifactId><version>2.4</version><configuration><warName>${project.artifactId}</warName></configuration></plugin><plugin><groupId>org.apache.tomcat.maven</groupId><artifactId>tomcat7-maven-plugin</artifactId><version>2.2</version></plugin></plugins></build></project>

乱码的问题就在于少了一个bean，把这个bean加上就好了，重要事情说三遍：

这个bean一定要加在springMVC配置文件的最前面！

这个bean一定要加在springMVC配置文件的最前面！！

这个bean一定要加在springMVC配置文件的最前面！！！

如下：

<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"><property name="messageConverters"><list><bean class="org.springframework.http.converter.StringHttpMessageConverter"><property name="supportedMediaTypes"><list><value>text/plain;charset=utf-8</value><value>text/html;charset=UTF-8</value></list></property></bean></list></property>
</bean>

就OK了