报错如图所示：

java.io.FileNotFoundException: E:\SF\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\wtpwebapps\SF\WEB-INF\classes\..\..\uploadFiles\twoDimensionCode\36e14cb4fddb41c8b040ae5ccdb41e00.png (系统找不到指定的路径。)

	at java.io.RandomAccessFile.open(Native Method)

	at java.io.RandomAccessFile.<init>(Unknown Source)

	at javax.imageio.stream.FileImageOutputStream.<init>(Unknown Source)

	at com.sun.imageio.spi.FileImageOutputStreamSpi.createOutputStreamInstance(Unknown Source)

	at javax.imageio.ImageIO.createImageOutputStream(Unknown Source)

	at javax.imageio.ImageIO.write(Unknown Source)

	at com.sys.util.TwoDimensionCode.encoderQRCode(TwoDimensionCode.java:99)

	at com.sys.util.TwoDimensionCode.encoderQRCode(TwoDimensionCode.java:62)

	at com.sys.controller.system.tools.ToolController.createTwoDimensionCode(ToolController.java:169)

	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

	at java.lang.reflect.Method.invoke(Unknown Source)

	at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)

	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)

	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)

	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)

	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)

	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)

	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:938)

	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)

	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)

	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)

	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

	at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)

	at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)

	at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)

	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)

	at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)

	at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)

	at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)

	at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)

	at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)

	at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)

	at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)

	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)

	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)

	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

	at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)

	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)

	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)

	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506)

	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)

	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)

	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:962)

	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)

	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)

	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1115)

	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)

	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)

	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

	at java.lang.Thread.run(Unknown Source)

java.lang.NullPointerException

	at javax.imageio.ImageIO.write(Unknown Source)

	at com.sys.util.TwoDimensionCode.encoderQRCode(TwoDimensionCode.java:99)

	at com.sys.util.TwoDimensionCode.encoderQRCode(TwoDimensionCode.java:62)

	at com.sys.controller.system.tools.ToolController.createTwoDimensionCode(ToolController.java:169)

	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

	at java.lang.reflect.Method.invoke(Unknown Source)

	at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)

	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)

	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)

	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)

	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)

	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)

	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:938)

	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)

	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)

	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)

	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

	at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)

	at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)

	at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)

	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)

	at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)

	at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)

	at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)

	at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)

	at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)

	at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)

	at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)

	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)

	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)

	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

	at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)

	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)

	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)

	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506)

	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)

	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)

	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:962)

	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)

	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)

	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1115)

	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)

	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)

	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

	at java.lang.Thread.run(Unknown Source)

网上推荐解决方法路径，都尝试过，但不适用我的问题：

http://kingxss.iteye.com/blog/1741438

https://blog.csdn.net/jin970505/article/details/78945565

最后，在网上看到以下方法：

https://blog.csdn.net/yqs_love/article/details/51959776

不考虑ImageIO.write是否能自动生成文件，判断文件为空时候先自动创建文件，问题解决！

代码如下：

public static void encoderQRCode(String content, String imgPath, String imgType,

            int size) {

        try {

            BufferedImage bufImg = qRCodeCommon(content, imgType, size);

            File imgFile = new File(imgPath);

            if (!imgFile.exists()) {

                // 先得到文件的上级目录，并创建上级目录，在创建文件

                imgFile.getParentFile().mkdir();

                imgFile.createNewFile();

            }

            // 生成二维码QRCode图片

            ImageIO.write(bufImg, imgType, imgFile);

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

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