前言

有个项目需要使用java程序读取海康威视的相机图片。相机通过以太网连接服务器，部署在服务器上的java程序将相机拍摄的画面保存在指定路径下。
海康威视提供了sdk开发包，可以在官网中下载，windows和linux系统都有。但是开发包中给出的示例代码，无法满足实际需要，所以还需要对代码进行二次开发。
在进行二次开发时，官网并未提供java语言的开发手册，示例代码中也并未提供详细注释，所以我只能在阅读示例代码时，按照自己的理解添加一些注释。

客户端创建虚拟相机

实体相机已经还回去了，所以这里用MVS客户端创建一个虚拟相机，测试代码。

设置相机名字

示例代码

我这里只需要对保存照片的代码进行修改。
以下是官网提供的保存照片的代码
我在示例代码中对一些方法做了注释

保存图片程序

/***************************************************************************************************
 * @file      SaveImage.java
 * @breif     Use functions provided in MvCameraControlWrapper.jar to save image as JPEG。
 * @author    zhanglei72
 * @date      2020/02/10
 *
 * @warning  
 * @version   V1.0.0  2020/02/10 Create this file
 * @since     2020/02/10
 **************************************************************************************************/

import java.io.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Scanner;

import MvCameraControlWrapper.*;
import static MvCameraControlWrapper.MvCameraControl.*;
import static MvCameraControlWrapper.MvCameraControlDefines.*;

public class SaveImage
{
	/**
	* 打印连接的设备信息
	* 如果是通过以太网连接的相机，则会输出ip、名称等内容
	* 如果是通过usb连接的相机，则会输出相机名称
	*/
    private static void printDeviceInfo(MV_CC_DEVICE_INFO stDeviceInfo) 
    {
        if (null == stDeviceInfo) {
            System.out.println("stDeviceInfo is null");
            return;
        }
        
        if (stDeviceInfo.transportLayerType == MV_GIGE_DEVICE) {
            System.out.println("\tCurrentIp:       " + stDeviceInfo.gigEInfo.currentIp);
            System.out.println("\tModel:           " + stDeviceInfo.gigEInfo.modelName);
            System.out.println("\tUserDefinedName: " + stDeviceInfo.gigEInfo.userDefinedName);
        } else if (stDeviceInfo.transportLayerType == MV_USB_DEVICE) {
            System.out.println("\tUserDefinedName: " + stDeviceInfo.usb3VInfo.userDefinedName);
            System.out.println("\tSerial Number:   " + stDeviceInfo.usb3VInfo.serialNumber);
            System.out.println("\tDevice Number:   " + stDeviceInfo.usb3VInfo.deviceNumber);
        } else {
            System.err.print("Device is not supported! \n");
        }

        System.out.println("\tAccessible:      "
            + MvCameraControl.MV_CC_IsDeviceAccessible(stDeviceInfo, MV_ACCESS_Exclusive));
        System.out.println("");
    }

    private static void printFrameInfo(MV_FRAME_OUT_INFO stFrameInfo)
    {
        if (null == stFrameInfo)
        {
            System.err.println("stFrameInfo is null");
            return;
        }
        
        StringBuilder frameInfo = new StringBuilder("");
        frameInfo.append(("\tFrameNum[" + stFrameInfo.frameNum + "]"));
        frameInfo.append("\tWidth[" + stFrameInfo.width + "]");
        frameInfo.append("\tHeight[" + stFrameInfo.height + "]");
        frameInfo.append(String.format("\tPixelType[%#x]", stFrameInfo.pixelType.getnValue()));

        System.out.println(frameInfo.toString());
    }

	/**
	* 保存图片到本地
	* 这个方法中主要是设置了文件保存的路径
	*/
    public static void saveDataToFile(byte[] dataToSave, int dataSize, String fileName)
    {
        OutputStream os = null;

        try
        {
            // Create directory
            File tempFile = new File("dat");
            if (!tempFile.exists()) 
            {
                tempFile.mkdirs();
            }

            os = new FileOutputStream(tempFile.getPath() + File.separator + fileName);
            os.write(dataToSave, 0, dataSize);
            System.out.println("SaveImage succeed.");
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
        finally
        {
            // Close file stream
            try 
            {
                os.close();
            } 
            catch (IOException e) 
            {
                e.printStackTrace();
            }
        }
    }
    
    /**
    * 当有多个相机连接但程序只能保存一台相机拍摄的照片
    * 所以需要通过此方法输入相机索引号
    */
    public static int chooseCamera(ArrayList<MV_CC_DEVICE_INFO> stDeviceList)
    {
        if (null == stDeviceList)
        {
            return -1;
        }
        
        // Choose a device to operate
        int camIndex = -1;
        Scanner scanner = new Scanner(System.in);

        while (true)
        {
            try
            {
            	/*
            	* 手动输入
            	*/
                System.out.print("Please input camera index (-1 to quit):");
                camIndex = scanner.nextInt();
                if ((camIndex >= 0 && camIndex < stDeviceList.size()) || -1 == camIndex)
                {
                    break;
                }
                else
                {
                    System.out.println("Input error: " + camIndex);
                }
            }
            catch (Exception e)
            {
                e.printStackTrace();
                camIndex = -1;
                break;
            }
        }
        scanner.close();

        if (-1 == camIndex)
        {
            System.out.println("Bye.");
            return camIndex;
        }

        if (0 <= camIndex && stDeviceList.size() > camIndex)
        {
            if (MV_GIGE_DEVICE == stDeviceList.get(camIndex).transportLayerType)
            {
                System.out.println("Connect to camera[" + camIndex + "]: " + stDeviceList.get(camIndex).gigEInfo.userDefinedName);
            }
            else if (MV_USB_DEVICE == stDeviceList.get(camIndex).transportLayerType)
            {
                System.out.println("Connect to camera[" + camIndex + "]: " + stDeviceList.get(camIndex).usb3VInfo.userDefinedName);
            }
            else
            {
                System.out.println("Device is not supported.");
            }
        }
        else
        {
            System.out.println("Invalid index " + camIndex);
            camIndex = -1;
        }

        return camIndex;
    }

	/**
	* 主方法
	* 保存照片的代码在这里
	*/
    public static void main(String[] args)
    {
        int nRet = MV_OK;
        int camIndex = -1;
        Handle hCamera = null;
        ArrayList<MV_CC_DEVICE_INFO> stDeviceList;

        do
        {
            System.out.println("SDK Version " + MvCameraControl.MV_CC_GetSDKVersion());

            // Enuerate GigE and USB devices 
            try
            {
                stDeviceList = MV_CC_EnumDevices(MV_GIGE_DEVICE | MV_USB_DEVICE);
                if (0 >= stDeviceList.size())
                {
                    System.out.println("No devices found!");
                    break;
                }
                int i = 0;
                for (MV_CC_DEVICE_INFO stDeviceInfo : stDeviceList)
                {
                    System.out.println("[camera " + (i++) + "]");
                    printDeviceInfo(stDeviceInfo);
                }
            }
            catch (CameraControlException e)
            {
                System.err.println("Enumrate devices failed!" + e.toString());
                e.printStackTrace();
                break;
            }

            // choose camera
            camIndex = chooseCamera(stDeviceList);
            if (camIndex == -1)
            {
                break;
            }

            // Create handle
            try
            {
                hCamera = MvCameraControl.MV_CC_CreateHandle(stDeviceList.get(camIndex));
            }
            catch (CameraControlException e)
            {
                System.err.println("Create handle failed!" + e.toString());
                e.printStackTrace();
                hCamera = null;
                break;
            }

            // Open device
            nRet = MvCameraControl.MV_CC_OpenDevice(hCamera);
            if (MV_OK != nRet)
            {
                System.err.printf("Connect to camera failed, errcode: [%#x]\n", nRet);
                break;
            }

            // Make sure that trigger mode is off
            /*
            * 设置相机的触发器开关 Off On
            */
            nRet = MvCameraControl.MV_CC_SetEnumValueByString(hCamera, "TriggerMode", "Off");
            if (MV_OK != nRet)
            {
                System.err.printf("SetTriggerMode failed, errcode: [%#x]\n", nRet);
                break;
            }

            // Get payload size
            MVCC_INTVALUE stParam = new MVCC_INTVALUE();
            nRet = MvCameraControl.MV_CC_GetIntValue(hCamera, "PayloadSize", stParam);
            if (MV_OK != nRet)
            {
                System.err.printf("Get PayloadSize fail, errcode: [%#x]\n", nRet);
                break;
            }

            // Start grabbing
            nRet = MvCameraControl.MV_CC_StartGrabbing(hCamera);
            if (MV_OK != nRet)
            {
                System.err.printf("Start Grabbing fail, errcode: [%#x]\n", nRet);
                break;
            }

            // Get one frame
            MV_FRAME_OUT_INFO stImageInfo = new MV_FRAME_OUT_INFO();
            byte[] pData = new byte[(int)stParam.curValue];
            nRet = MvCameraControl.MV_CC_GetOneFrameTimeout(hCamera, pData, stImageInfo, 1000);
            if (MV_OK != nRet)
            {
                System.err.printf("GetOneFrameTimeout fail, errcode:[%#x]\n", nRet);
                break;
            }

            System.out.println("GetOneFrame: ");
            printFrameInfo(stImageInfo);
            int imageLen = stImageInfo.width * stImageInfo.height * 3;    // Every RGB pixel takes 3 bytes
            byte[] imageBuffer = new byte[imageLen];

            // Call MV_CC_SaveImage to save image as JPEG
            MV_SAVE_IMAGE_PARAM stSaveParam = new MV_SAVE_IMAGE_PARAM();
            stSaveParam.width = stImageInfo.width;                                  // image width
            stSaveParam.height = stImageInfo.height;                                // image height
            stSaveParam.data = pData;                                               // image data
            stSaveParam.dataLen = stImageInfo.frameLen;                             // image data length
            stSaveParam.pixelType = stImageInfo.pixelType;                          // image pixel format
            stSaveParam.imageBuffer = imageBuffer;                                  // output image buffer
            stSaveParam.imageType = MV_SAVE_IAMGE_TYPE.MV_Image_Jpeg;               // output image pixel format
            stSaveParam.methodValue = 0;                                            // Interpolation method that converts Bayer format to RGB24.  0-Neareast 1-double linear 2-Hamilton
            stSaveParam.jpgQuality = 60;                                            // JPG endoding quality(50-99]

            nRet = MvCameraControl.MV_CC_SaveImage(hCamera, stSaveParam);
            if (MV_OK != nRet)
            {
                System.err.printf("SaveImage fail, errcode: [%#x]\n", nRet);
                break;
            }

            // Save buffer content to file
            /*
            * 将照片保存在本地，且在这里指定文件的名称
            */
            saveDataToFile(imageBuffer, stSaveParam.imageLen, "SaveImage.jpeg");

            // Stop grabbing
            nRet = MvCameraControl.MV_CC_StopGrabbing(hCamera);
            if (MV_OK != nRet)
            {
                System.err.printf("StopGrabbing fail, errcode: [%#x]\n", nRet);
                break;
            }
        } while (false);

        if (null != hCamera)
        {
            // Destroy handle
            nRet = MvCameraControl.MV_CC_DestroyHandle(hCamera);
            if (MV_OK != nRet) {
                System.err.printf("DestroyHandle failed, errcode: [%#x]\n", nRet);
            }
        }
    }
}

运行结果

程序启动后，在控制台输出可连接的所有相机，用户输入相机索引号连接指定相机。[Camera 0]表示索引号为0。然后相机自动进行拍摄。

修改需求

通过运行程序，发现直接使用示例代码，无法满足实际使用需求。无法做到，图片保存名称不重复、图片保存路径无法自定义、需要用户手动输入相机索引号、对于指定日期以前的旧照片删除等等。

二次开发

首先记录对核心代码的修改内容，然后再将所有代码都列出来。
我这里使用了Springboot框架，为的是通过application.yml文件配置路径等数量，另外使用maven架构，方便打包。

SaveImage为核心代码类
FileUtil用来删除过期照片
ApplicationYml用来读取yml文件中的配置

引入外部包

在进行二次开发前，还需要引入官网提供的下载包。

创建lib文件夹，将jar放入后，右击，Add as library。
在pom.xml文件中引入依赖

    <dependencies>
        <dependency>
            <groupId>com.hzx.testmaven34hikvision</groupId>
            <artifactId>MvCameraControlWrapper</artifactId>
            <version>1.0</version>
            <scope>system</scope>
            <systemPath>${project.basedir}/lib/MvCameraControlWrapper.jar</systemPath>
        </dependency>
    </dependencies>
<build>
                <plugins>
                    <plugin>
                        <groupId>org.springframework.boot</groupId>
                        <artifactId>spring-boot-maven-plugin</artifactId>
                        <version>2.3.0.RELEASE</version>
                        <configuration>
                            <fork>true</fork>
                            <includeSystemScope>true</includeSystemScope>
                        </configuration>
                    </plugin>
                     <plugin>
                        <groupId>org.apache.maven.plugins</groupId>
                        <artifactId>maven-surefire-plugin</artifactId>
                        <configuration>
                            <skip>true</skip>
                        </configuration>
                    </plugin>
                </plugins>
</build>

对SaveImage.java文件进行修改

这里先对照着示例代码，将修改的地方列举出来。全部代码后面给出。
示例代码中一些无关紧要的输出内容，在二次开发时注释掉了，这里就不再详细说明。
修改的地方，通过注释标出

保存图片saveDataToFile方法

    public static void saveDataToFile(byte[] dataToSave, int dataSize, String fileName,String savePath) {
        OutputStream os = null;

        try {
            // Create directory
           	/*
           	* savePath参数为图片保存路径，在调用方法时通过参数传入
           	*/
            File tempFile = new File(savePath);
            if (!tempFile.exists()) {
                tempFile.mkdirs();
            }

            os = new FileOutputStream(tempFile.getPath() + File.separator + fileName);
            os.write(dataToSave, 0, dataSize);
            /*
            * 图片保存成功后，输出当前时间
            */
            System.out.println("--- " + sfTime.format(new Date()) + " Save Image succeed ---");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // Close file stream
            try {
                os.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

选择相机chooseCamera方法

    public static int chooseCamera(ArrayList<MV_CC_DEVICE_INFO> stDeviceList,int camIndex) {
        if (null == stDeviceList) {
            return -1;
        }

        // Choose a device to operate
        //int camIndex = -1;
        Scanner scanner = new Scanner(System.in);
		
        while (true) {
            try {
                /*
                * 原本需要用户输入的camIndex（相机索引），修改为调用方法时传参
                * 实际值从yml文件中获取
                */
                //System.out.print("Please input camera index (-1 to quit):");
                //camIndex = scanner.nextInt();
                //camIndex = 1;
                
                if ((camIndex >= 0 && camIndex < stDeviceList.size()) || -1 == camIndex) {
                    // System.out.println("自动连接 [camera 0]");
                    break;
                } else {
                    System.out.println("Input error: " + camIndex);
                    camIndex=-1;
                    break;
                }
            } catch (Exception e) {
                e.printStackTrace();
                camIndex = -1;
                break;
            }
        }
        scanner.close();
        
		/**
		* 未修改代码省略
		*/
    }

主方法

这里已经不是main方法了，因为使用springboot所以有了StartApplication类

    public static void mainImage(String savePath,Integer deleteDay,int camIndex) {
        int nRet = MV_OK;
        // int camIndex = -1;
        Handle hCamera = null;
        ArrayList<MV_CC_DEVICE_INFO> stDeviceList;
        boolean needConnectDevice = true;

        do {
            // Make sure that trigger mode is off
            /*
            * 设置拍照触发器开关 出发模式需要到mvs客户端中为相机设置
            * 这里需要把MvCameraControl.MV_CC_SetEnumValueByString()方法第三个参数从Off改为On
            */
            nRet = MvCameraControl.MV_CC_SetEnumValueByString(hCamera, "TriggerMode", "On");
            if (MV_OK != nRet) {
                System.err.printf("SetTriggerMode failed, errcode: [%#x]\n", nRet);
                break;
            }

            nRet = MvCameraControl.MV_CC_SaveImage(hCamera, stSaveParam);
            if (MV_OK != nRet) {
                //System.err.printf("SaveImage fail, errcode: [%#x]\n", nRet);
                // System.out.println(sfTime.format(new Date())+" "+ nRet + " No Image Need Save...");
                // break;
                //continue;
            } else {

                // 保存照片的方法 Save buffer content to file
                /**
                * 在这里设置照片的保存路径
                */
                String savePathFull = savePath+ sfSave.format(new Date())+"/"+"camera"+camIndex+"/";
                saveDataToFile(imageBuffer, stSaveParam.imageLen, "SaveImage-" + sfSecond.format(new Date())+ ".jpeg",savePathFull);

                /* 
                * 有新图片保存时，删除X天前保存图片的文件夹
                * X的实际值，通过参数传入
                */
                Calendar calendar = Calendar.getInstance();
                calendar.setTime(new Date());
                // X天前的日期
                calendar.add(Calendar.DATE,(-deleteDay));
                String deleteFile = savePath+sfSave.format(calendar.getTime())+"/";
                FileUtil.deleteAllFile(deleteFile);
            }
        } while (true);
    }

FileUtil类处理过期照片

这里使用递归，删除保存的照片

public class FileUtil {

    public static void deleteAllFile(String dir){
        File dirFile = new File(dir);
        // 判断dir是否是目录且dir是否存在
        if (!dirFile.exists()||(!dirFile.isDirectory())) {
            // System.out.println("目录："+dir+" 不存在");
            return;
        }
        // 删除文件夹中所有的文件，包括子文件夹
        File[] files = dirFile.listFiles();
        for (int i = 0; i < files.length; i++) {
            if (files[i].isFile()) {
                // 如果是文件直接删除
                files[i].delete();
            }else if(files[i].isDirectory()){
                // 如果是目录，则通过递归删除
                deleteAllFile(files[i].getAbsolutePath());
            }
        }
        // 最后删除当前文件夹
        dirFile.delete();
    }
}

启动类与配置文件

application.yml

config-info:
  image: D:/JavaCode/testmaven34hikvision/catch-image/ #图片保存路径
  deleteDay: 3 #删除X天前的图片
  connectCamera: 0 #连接相机编号

通过实体类读取yml

@ConfigurationProperties(prefix = "config-info")
@Component
public class ApplicationYml {
    private String image;
    private String deleteDay;
    private String connectCamera;

    public ApplicationYml() {
    }

    public String getImage() {
        return image;
    }

    public void setImage(String image) {
        this.image = image;
    }

    public String getDeleteDay() {
        return deleteDay;
    }

    public void setDeleteDay(String deleteDay) {
        this.deleteDay = deleteDay;
    }

    public String getConnectCamera() {
        return connectCamera;
    }

    public void setConnectCamera(String connectCamera) {
        this.connectCamera = connectCamera;
    }
}

启动类

@SpringBootApplication
@EnableConfigurationProperties
public class StartImage {

    private static ApplicationYml applicationYml;

    @Autowired
    public void setApplicationYml(ApplicationYml applicationYml) {
        this.applicationYml = applicationYml;
    }

    public static void main(String[] args) throws Exception {
        SpringApplication.run(StartImage.class, args);
        System.out.println("image: "+applicationYml.getImage());
        System.out.println("deleteDay: "+applicationYml.getDeleteDay());
        System.out.println("camera: "+applicationYml.getConnectCamera());
        String image = applicationYml.getImage();
        SaveImage.mainImage(image,Integer.valueOf(applicationYml.getDeleteDay()),Integer.valueOf(applicationYml.getConnectCamera()));
    }
}

SaveImage.java类全部代码

public class SaveImage {
    private static SimpleDateFormat sfSecond = new SimpleDateFormat("yyyy-M-d_HH-mm-dd-SSS");

    private static SimpleDateFormat sfTime = new SimpleDateFormat("HH:mm:ss");

    private static SimpleDateFormat sfSave = new SimpleDateFormat("yyyy-M-d");

    private static void printDeviceInfo(MV_CC_DEVICE_INFO stDeviceInfo) {
        if (null == stDeviceInfo) {
            System.out.println("stDeviceInfo is null");
            return;
        }

        if (stDeviceInfo.transportLayerType == MV_GIGE_DEVICE) {
            System.out.println("\tCurrentIp:       " + stDeviceInfo.gigEInfo.currentIp);
            System.out.println("\tModel:           " + stDeviceInfo.gigEInfo.modelName);
            System.out.println("\tUserDefinedName: " + stDeviceInfo.gigEInfo.userDefinedName);
        } else if (stDeviceInfo.transportLayerType == MV_USB_DEVICE) {
            System.out.println("\tUserDefinedName: " + stDeviceInfo.usb3VInfo.userDefinedName);
            System.out.println("\tSerial Number:   " + stDeviceInfo.usb3VInfo.serialNumber);
            System.out.println("\tDevice Number:   " + stDeviceInfo.usb3VInfo.deviceNumber);
        } else {
            System.err.print("Device is not supported! \n");
        }

        System.out.println("\tAccessible:      " + MvCameraControl.MV_CC_IsDeviceAccessible(stDeviceInfo, MV_ACCESS_Exclusive));
        System.out.println("");
    }

    private static void printFrameInfo(MV_FRAME_OUT_INFO stFrameInfo) {
        if (null == stFrameInfo) {
            System.err.println("stFrameInfo is null");
            return;
        }

        StringBuilder frameInfo = new StringBuilder("");
        frameInfo.append(("\tFrameNum[" + stFrameInfo.frameNum + "]"));
        frameInfo.append("\tWidth[" + stFrameInfo.width + "]");
        frameInfo.append("\tHeight[" + stFrameInfo.height + "]");
        frameInfo.append(String.format("\tPixelType[%#x]", stFrameInfo.pixelType.getnValue()));

        // System.out.println(frameInfo.toString());
    }

    public static void saveDataToFile(byte[] dataToSave, int dataSize, String fileName,String savePath) {
        OutputStream os = null;

        try {
            // Create directory
            //File tempFile = new File(imagePathFun());
            File tempFile = new File(savePath);
            if (!tempFile.exists()) {
                tempFile.mkdirs();
            }

            os = new FileOutputStream(tempFile.getPath() + File.separator + fileName);
            os.write(dataToSave, 0, dataSize);
            System.out.println("--- " + sfTime.format(new Date()) + " Save Image succeed ---");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // Close file stream
            try {
                os.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public static int chooseCamera(ArrayList<MV_CC_DEVICE_INFO> stDeviceList,int camIndex) {
        if (null == stDeviceList) {
            return -1;
        }

        // Choose a device to operate
        //int camIndex = -1;
        Scanner scanner = new Scanner(System.in);

        while (true) {
            try {
                //System.out.print("Please input camera index (-1 to quit):");
                //camIndex = scanner.nextInt();
                //camIndex = 1;
                if ((camIndex >= 0 && camIndex < stDeviceList.size()) || -1 == camIndex) {
                    // System.out.println("自动连接 [camera 0]");
                    break;
                } else {
                    System.out.println("Input error: " + camIndex);
                    camIndex=-1;
                    break;
                }
            } catch (Exception e) {
                e.printStackTrace();
                camIndex = -1;
                break;
            }
        }
        scanner.close();

        if (-1 == camIndex) {
            System.out.println("Bye.");
            return camIndex;
        }

        if (0 <= camIndex && stDeviceList.size() > camIndex) {
            if (MV_GIGE_DEVICE == stDeviceList.get(camIndex).transportLayerType) {
                System.out.println("Connect to camera[" + camIndex + "]: " + stDeviceList.get(camIndex).gigEInfo.userDefinedName);
            } else if (MV_USB_DEVICE == stDeviceList.get(camIndex).transportLayerType) {
                System.out.println("Connect to camera[" + camIndex + "]: " + stDeviceList.get(camIndex).usb3VInfo.userDefinedName);
            } else {
                System.out.println("Device is not supported.");
            }
        } else {
            System.out.println("Invalid index " + camIndex);
            camIndex = -1;
        }

        return camIndex;
    }

    public static void mainImage(String savePath,Integer deleteDay,int camIndex) {
        int nRet = MV_OK;
        // int camIndex = -1;
        Handle hCamera = null;
        ArrayList<MV_CC_DEVICE_INFO> stDeviceList;
        boolean needConnectDevice = true;

        do {

            if (needConnectDevice) {
                System.out.println("SDK Version " + MvCameraControl.MV_CC_GetSDKVersion());
                // Enuerate GigE and USB devices
                try {
                    stDeviceList = MV_CC_EnumDevices(MV_GIGE_DEVICE | MV_USB_DEVICE);
                    if (0 >= stDeviceList.size()) {
                        System.out.println("No devices found!");
                        break;
                    }
                    int i = 0;
                    for (MV_CC_DEVICE_INFO stDeviceInfo : stDeviceList) {
                        System.out.println("[camera " + (i++) + "]");
                        printDeviceInfo(stDeviceInfo);
                    }
                } catch (CameraControlException e) {
                    System.err.println("Enumrate devices failed!" + e.toString());
                    e.printStackTrace();
                    break;
                }

                // choose camera
                camIndex = chooseCamera(stDeviceList,camIndex);
                if (camIndex == -1) {
                    break;
                }

                // Create handle
                try {
                    hCamera = MvCameraControl.MV_CC_CreateHandle(stDeviceList.get(camIndex));
                } catch (CameraControlException e) {
                    System.err.println("Create handle failed!" + e.toString());
                    e.printStackTrace();
                    hCamera = null;
                    break;
                }

                // Open device
                nRet = MvCameraControl.MV_CC_OpenDevice(hCamera);
                if (MV_OK != nRet) {
                    System.err.printf("Connect to camera failed, errcode: [%#x]\n", nRet);
                    break;
                }
                needConnectDevice = false;
            }

            /*
            测试线路选择器
             */

            // Make sure that trigger mode is off
            nRet = MvCameraControl.MV_CC_SetEnumValueByString(hCamera, "TriggerMode", "On");
            if (MV_OK != nRet) {
                System.err.printf("SetTriggerMode failed, errcode: [%#x]\n", nRet);
                break;
            }

            // Get payload size
            MVCC_INTVALUE stParam = new MVCC_INTVALUE();
            nRet = MvCameraControl.MV_CC_GetIntValue(hCamera, "PayloadSize", stParam);
            if (MV_OK != nRet) {
                System.err.printf("Get PayloadSize fail, errcode: [%#x]\n", nRet);
                break;
            }

            // Start grabbing
            nRet = MvCameraControl.MV_CC_StartGrabbing(hCamera);
            if (MV_OK != nRet) {
                System.err.printf("Start Grabbing fail, errcode: [%#x]\n", nRet);
                break;
            }

            // Get one frame
            MV_FRAME_OUT_INFO stImageInfo = new MV_FRAME_OUT_INFO();
            byte[] pData = new byte[(int) stParam.curValue];
            nRet = MvCameraControl.MV_CC_GetOneFrameTimeout(hCamera, pData, stImageInfo, 1000);
            if (MV_OK != nRet) {
                System.err.printf("GetOneFrameTimeout fail, errcode:[%#x]\n", nRet);
                break;
            }

            // System.out.println("GetOneFrame: ");
            printFrameInfo(stImageInfo);
            int imageLen = stImageInfo.width * stImageInfo.height * 3;    // Every RGB pixel takes 3 bytes
            byte[] imageBuffer = new byte[imageLen];

            // Call MV_CC_SaveImage to save image as JPEG
            MV_SAVE_IMAGE_PARAM stSaveParam = new MV_SAVE_IMAGE_PARAM();
            stSaveParam.width = stImageInfo.width;                                  // image width
            stSaveParam.height = stImageInfo.height;                                // image height
            stSaveParam.data = pData;                                               // image data
            stSaveParam.dataLen = stImageInfo.frameLen;                             // image data length
            stSaveParam.pixelType = stImageInfo.pixelType;                          // image pixel format
            stSaveParam.imageBuffer = imageBuffer;                                  // output image buffer
            stSaveParam.imageType = MV_SAVE_IAMGE_TYPE.MV_Image_Jpeg;               // output image pixel format
            stSaveParam.methodValue = 0;                                            // Interpolation method that converts Bayer format to RGB24.  0-Neareast 1-double linear 2-Hamilton
            stSaveParam.jpgQuality = 60;                                            // JPG endoding quality(50-99]

            nRet = MvCameraControl.MV_CC_SaveImage(hCamera, stSaveParam);
            if (MV_OK != nRet) {
                //System.err.printf("SaveImage fail, errcode: [%#x]\n", nRet);
                // System.out.println(sfTime.format(new Date())+" "+ nRet + " No Image Need Save...");
                // break;
                //continue;
            } else {

                // 保存照片的方法 Save buffer content to file
                String savePathFull = savePath+ sfSave.format(new Date())+"/"+"camera"+camIndex+"/";
                saveDataToFile(imageBuffer, stSaveParam.imageLen, "SaveImage-" + sfSecond.format(new Date())+ ".jpeg",savePathFull);

                // 有新图片保存时，删除X天前保存图片的文件夹
                Calendar calendar = Calendar.getInstance();
                calendar.setTime(new Date());
                // X天前的日期
                calendar.add(Calendar.DATE,(-deleteDay));
                String deleteFile = savePath+sfSave.format(calendar.getTime())+"/";
                FileUtil.deleteAllFile(deleteFile);

            }
            // Stop grabbing
            nRet = MvCameraControl.MV_CC_StopGrabbing(hCamera);
            if (MV_OK != nRet) {
                System.err.printf("StopGrabbing fail, errcode: [%#x]\n", nRet);
                break;
            }


            //            try {
            //                Thread.sleep(1000);
            //            } catch (InterruptedException e) {
            //                e.printStackTrace();
            //            }

        } while (true);

        if (null != hCamera) {
            // Destroy handle
            nRet = MvCameraControl.MV_CC_DestroyHandle(hCamera);
            if (MV_OK != nRet) {
                System.err.printf("DestroyHandle failed, errcode: [%#x]\n", nRet);
            }
        }
    }

    /**
     * 根据年月日计算图片的路径
     * @return
     */
    private static String imagePathFun(){
        SimpleDateFormat sfDate = new SimpleDateFormat("yyyy-M-d");
        return "/home/hello/MVS/catch_image/"+sfDate.format(new Date())+"/";
    }
}

运行结果