mybatis修改xml文件不重啟服務方法

package com.st.tks.utils.mybatis;

import com.google.common.collect.Sets;
import org.apache.commons.lang3.StringUtils;
import org.apache.ibatis.builder.xml.XMLMapperBuilder;
import org.apache.ibatis.executor.ErrorContext;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.SqlSessionFactory;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.core.NestedIOException;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.stereotype.Component;
import org.springframework.util.ClassUtils;

import javax.annotation.PostConstruct;
import java.io.;
import java.lang.reflect.Field;
import java.util.;

@Component
public class MapperRefresh implements ApplicationContextAware {

private static org.slf4j.Logger log = LoggerFactory.getLogger(MapperRefresh.class.getName());
private static String filename = "/conf/mybatis-refresh.properties";
private static Properties prop = new Properties();

private ApplicationContext applicationContext ;

private static boolean enabled;         // 是否啟用Mapper刷新線程功能
private static boolean refresh;         // 刷新啟用后，是否啟動了刷新線程

private Set<String> location;         // Mapper實際資源路徑

private Resource[] mapperLocations;     // Mapper資源路徑
private Configuration configuration;        // MyBatis配置對象

private Long beforeTime = 0L;           // 上一次刷新時間
private static int delaySeconds;        // 延遲刷新秒數
private static int sleepSeconds;        // 休眠時間
private static String mappingPath;      // xml文件夾匹配字符串，需要根據需要修改

private static final String XML_RESOURCE_PATTERN = "**/*.xml";
private String basePackage = "/mybatis";

static {

    try {
        prop.load(MapperRefresh.class.getResourceAsStream(filename));
    } catch (Exception e) {
        log.error("Load mybatis-refresh “"+filename+"” file error.");
    }

    enabled = "true".equalsIgnoreCase(getPropString("enabled"));

    delaySeconds = getPropInt("delaySeconds");
    sleepSeconds = getPropInt("sleepSeconds");
    mappingPath = getPropString("mappingPath");

    delaySeconds = delaySeconds == 0 ? 50 : delaySeconds;
    sleepSeconds = sleepSeconds == 0 ? 3 : sleepSeconds;
    mappingPath = StringUtils.isBlank(mappingPath) ? "mappings" : mappingPath;

    log.debug("[enabled] " + enabled);
    log.debug("[delaySeconds] " + delaySeconds);
    log.debug("[sleepSeconds] " + sleepSeconds);
    log.debug("[mappingPath] " + mappingPath);
}

@PostConstruct
public void start() throws IOException {
    SqlSessionFactory factory = applicationContext.getBean(SqlSessionFactory.class);
    Configuration configuration = factory.getConfiguration();
    this.configuration = configuration ;
    mapperLocations = getResource(basePackage, XML_RESOURCE_PATTERN);
    exeTask();
}

public static boolean isRefresh() {
    return refresh;
}

public void exeTask() {

    beforeTime = System.currentTimeMillis();

    log.debug("[location] " + location);
    log.debug("[configuration] " + configuration);

    if (enabled) {
        // 啟動刷新線程
        final MapperRefresh runnable = this;
        new Thread(new Runnable() {
            @Override
            public void run() {

                if (location == null){
                    location = Sets.newHashSet();
                    log.debug("MapperLocation's length:" + mapperLocations.length);
                    for (Resource mapperLocation : mapperLocations) {
                        String s = mapperLocation.toString().replaceAll("\\\\", "/");
                        s = s.substring("file [".length(), s.lastIndexOf(mappingPath) + mappingPath.length());
                        if (!location.contains(s)) {
                            location.add(s);
                            log.debug("Location:" + s);
                        }
                    }
                    log.debug("Locarion's size:" + location.size());
                }

                try {
                    Thread.sleep(delaySeconds * 1000);
                } catch (InterruptedException e2) {
                    e2.printStackTrace();
                }
                refresh = true;

                log.info("========= Enabled refresh mybatis mapper =========");

                while (true) {
                    try {
                        for (String s : location) {
                            runnable.refresh(s, beforeTime);
                        }
                    } catch (Exception e1) {
                        e1.printStackTrace();
                    }
                    try {
                        Thread.sleep(sleepSeconds * 1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }

                }
            }
        }, "MyBatis-Mapper-Refresh").start();
    }
}

/**
 * 執行刷新
 * @param filePath 刷新目錄
 * @param beforeTime 上次刷新時間
 * @throws NestedIOException 解析異常
 * @throws FileNotFoundException 文件未找到
 * @author ThinkGem
 */
@SuppressWarnings({ "rawtypes", "unchecked" })
private void refresh(String filePath, Long beforeTime) throws Exception {

    // 本次刷新時間
    Long refrehTime = System.currentTimeMillis();

    // 獲取需要刷新的Mapper文件列表
    List<File> fileList = this.getRefreshFile(new File(filePath), beforeTime);
    if (fileList.size() > 0) {
        log.debug("Refresh file: " + fileList.size());
    }
    for (int i = 0; i < fileList.size(); i++) {
        InputStream inputStream = new FileInputStream(fileList.get(i));
        String resource = fileList.get(i).getAbsolutePath();
        try {

            // 清理原有資源，更新為自己的StrictMap方便，增量重新加載
            String[] mapFieldNames = new String[]{
                    "mappedStatements", "caches",
                    "resultMaps", "parameterMaps",
                    "keyGenerators", "sqlFragments"
            };
            for (String fieldName : mapFieldNames){
                Field field = configuration.getClass().getDeclaredField(fieldName);
                field.setAccessible(true);
                Map map = ((Map)field.get(configuration));
                if (!(map instanceof StrictMap)){
                    Map newMap = new StrictMap(StringUtils.capitalize(fieldName) + "collection");
                    for (Object key : map.keySet()){
                        try {
                            newMap.put(key, map.get(key));
                        }catch(IllegalArgumentException ex){
                            newMap.put(key, ex.getMessage());
                        }
                    }
                    field.set(configuration, newMap);
                }
            }

            // 清理已加載的資源標識，方便讓它重新加載。
            Field loadedResourcesField = configuration.getClass().getDeclaredField("loadedResources");
            loadedResourcesField.setAccessible(true);
            Set loadedResourcesSet = ((Set)loadedResourcesField.get(configuration));
            loadedResourcesSet.remove(resource);

            //重新編譯加載資源文件。
            XMLMapperBuilder xmlMapperBuilder = new XMLMapperBuilder(inputStream, configuration,
                    resource, configuration.getSqlFragments());
            xmlMapperBuilder.parse();
        } catch (Exception e) {
            throw new NestedIOException("Failed to parse mapping resource: '" + resource + "'", e);
        } finally {
            ErrorContext.instance().reset();
        }

        if (log.isDebugEnabled()) {
            log.debug("Refresh file: " + fileList.get(i).getAbsolutePath());
            log.debug("Refresh filename: " + fileList.get(i).getName());
        }
    }

    if (fileList.size() > 0) {
        this.beforeTime = refrehTime;
    }
}

/**
 * 獲取需要刷新的文件列表
 * @param dir 目錄
 * @param beforeTime 上次刷新時間
 * @return 刷新文件列表
 */
private List<File> getRefreshFile(File dir, Long beforeTime) {
    List<File> fileList = new ArrayList<File>();

    File[] files = dir.listFiles();
    if (files != null) {
        for (int i = 0; i < files.length; i++) {
            File file = files[i];
            if (file.isDirectory()) {
                fileList.addAll(this.getRefreshFile(file, beforeTime));
            } else if (file.isFile()) {
                if (this.checkFile(file, beforeTime)) {
                    fileList.add(file);
                }
            } else {
                System.out.println("Error file." + file.getName());
            }
        }
    }
    return fileList;
}

/**
 * 判斷文件是否需要刷新
 * @param file 文件
 * @param beforeTime 上次刷新時間
 * @return 需要刷新返回true，否則返回false
 */
private boolean checkFile(File file, Long beforeTime) {
    if (file.lastModified() > beforeTime) {
        return true;
    }
    return false;
}

/**
 * 獲取整數屬性
 * @param key
 * @return
 */
private static int getPropInt(String key) {
    int i = 0;
    try {
        i = Integer.parseInt(getPropString(key));
    } catch (Exception e) {
    }
    return i;
}

/**
 * 獲取字符串屬性
 * @param key
 * @return
 */
private static String getPropString(String key) {
    return prop == null ? null : prop.getProperty(key);
}

@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    this.applicationContext = applicationContext ;
}

/**
 * 重寫 org.apache.ibatis.session.Configuration.StrictMap 類
 * 來自 MyBatis3.4.0版本，修改 put 方法，允許反復 put更新。
 */
public static class StrictMap<V> extends HashMap<String, V> {

    private static final long serialVersionUID = -4950446264854982944L;
    private String name;

    public StrictMap(String name, int initialCapacity, float loadFactor) {
        super(initialCapacity, loadFactor);
        this.name = name;
    }

    public StrictMap(String name, int initialCapacity) {
        super(initialCapacity);
        this.name = name;
    }

    public StrictMap(String name) {
        super();
        this.name = name;
    }

    public StrictMap(String name, Map<String, ? extends V> m) {
        super(m);
        this.name = name;
    }

    @SuppressWarnings("unchecked")
    public V put(String key, V value) {
        // ThinkGem 如果現在狀態為刷新，則刷新(先刪除后添加)
        if (MapperRefresh.isRefresh()) {
            remove(key);
        }
        // ThinkGem end
        if (containsKey(key)) {
            throw new IllegalArgumentException(name + " already contains value for " + key);
        }
        if (key.contains(".")) {
            final String shortKey = getShortName(key);
            if (super.get(shortKey) == null) {
                super.put(shortKey, value);
            } else {
                super.put(shortKey, (V) new Ambiguity(shortKey));
            }
        }
        return super.put(key, value);
    }

    public V get(Object key) {
        V value = super.get(key);
        if (value == null) {
            throw new IllegalArgumentException(name + " does not contain value for " + key);
        }
        if (value instanceof Ambiguity) {
            throw new IllegalArgumentException(((Ambiguity) value).getSubject() + " is ambiguous in " + name
                    + " (try using the full name including the namespace, or rename one of the entries)");
        }
        return value;
    }

    private String getShortName(String key) {
        final String[] keyparts = key.split("\\.");
        return keyparts[keyparts.length - 1];
    }

    protected static class Ambiguity {
        private String subject;

        public Ambiguity(String subject) {
            this.subject = subject;
        }

        public String getSubject() {
            return subject;
        }
    }

}

public Resource[] getResource(String basePackage, String pattern) throws IOException {
    String packageSearchPath = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX
            + ClassUtils.convertClassNameToResourcePath(applicationContext.getEnvironment().resolveRequiredPlaceholders(
            basePackage)) + "/" + pattern;
     ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
    Resource[] resources = resourcePatternResolver.getResources(packageSearchPath);
    return resources;
}

}