解决like %的问题

src/main/java/com/diagbot/config/mybatisLike/AbstractLikeSqlConverter.java

@@ -0,0 +1,223 @@
+package com.diagbot.config.mybatisLike;
+
+import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.lang3.StringUtils;
+
+import java.beans.IntrospectionException;
+import java.beans.PropertyDescriptor;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.Set;
+
+
+/**
+ * @Description: 包含like的SQL语句转义模板
+ * @author: gaodm
+ * @time: 2020/11/2 16:05
+ */
+@Slf4j
+public abstract class AbstractLikeSqlConverter<T> {
+
+    /**
+     * SQL语句like使用关键字%
+     */
+    private final static String LIKE_SQL_KEY = "%";
+
+    /**
+     * SQL语句需要转义的关键字
+     */
+    private final static String[] ESCAPE_CHAR = new String[] { LIKE_SQL_KEY, "_", "\\" };
+
+    /**
+     * mybatis-plus中like的SQL语句样式
+     */
+    private final static String MYBATIS_PLUS_LIKE_SQL = " like ?";
+
+    /**
+     * mybatis-plus中参数前缀
+     */
+    private final static String MYBATIS_PLUS_WRAPPER_PREFIX = "ew.paramNameValuePairs.";
+
+    /**
+     * mybatis-plus中参数键
+     */
+    final static String MYBATIS_PLUS_WRAPPER_KEY = "ew";
+
+    /**
+     * mybatis-plus中参数分隔符
+     */
+    final static String MYBATIS_PLUS_WRAPPER_SEPARATOR = ".";
+
+    /**
+     * mybatis-plus中参数分隔符替换器
+     */
+    final static String MYBATIS_PLUS_WRAPPER_SEPARATOR_REGEX = "\\.";
+
+    /**
+     * 已经替换过的标记
+     */
+    final static String REPLACED_LIKE_KEYWORD_MARK = "replaced.keyword";
+
+    /**
+     * 转义特殊字符
+     *
+     * @param sql       SQL语句
+     * @param fields    字段列表
+     * @param parameter 参数对象
+     */
+    public void convert(String sql, Set<String> fields, T parameter) {
+        for (String field : fields) {
+            if (this.hasMybatisPlusLikeSql(sql)) {
+                if (this.hasWrapper(field)) {
+                    // 第一种情况：在业务层进行条件构造产生的模糊查询关键字,使用QueryWrapper,LambdaQueryWrapper
+                    this.transferWrapper(field, parameter);
+                } else {
+                    // 第二种情况：未使用条件构造器，但是在service层进行了查询关键字与模糊查询符`%`手动拼接
+                    this.transferSelf(field, parameter);
+                }
+            } else {
+                // 第三种情况：在Mapper类的注解SQL中进行了模糊查询的拼接
+                this.transferSplice(field, parameter);
+            }
+        }
+    }
+
+    /**
+     * 转义条件构造的特殊字符
+     * 在业务层进行条件构造产生的模糊查询关键字,使用QueryWrapper,LambdaQueryWrapper
+     *
+     * @param field     字段名称
+     * @param parameter 参数对象
+     */
+    public abstract void transferWrapper(String field, T parameter);
+
+    /**
+     * 转义自定义条件拼接的特殊字符
+     * 未使用条件构造器，但是在service层进行了查询关键字与模糊查询符`%`手动拼接
+     *
+     * @param field     字段名称
+     * @param parameter 参数对象
+     */
+    public abstract void transferSelf(String field, T parameter);
+
+    /**
+     * 转义自定义条件拼接的特殊字符
+     * 在Mapper类的注解SQL中进行了模糊查询的拼接
+     *
+     * @param field     字段名称
+     * @param parameter 参数对象
+     */
+    public abstract void transferSplice(String field, T parameter);
+
+    /**
+     * 转义通配符
+     *
+     * @param before 待转义字符串
+     * @return 转义后字符串
+     */
+    String escapeChar(String before) {
+        if (StringUtils.isNotBlank(before)) {
+            before = before.replaceAll("\\\\", "\\\\\\\\");
+            before = before.replaceAll("_", "\\\\_");
+            before = before.replaceAll("%", "\\\\%");
+        }
+        return before;
+    }
+
+    /**
+     * 是否包含需要转义的字符
+     *
+     * @param obj 待判断的对象
+     * @return true/false
+     */
+    boolean hasEscapeChar(Object obj) {
+        if (!(obj instanceof String)) {
+            return false;
+        }
+        return this.hasEscapeChar((String) obj);
+    }
+
+    /**
+     * 处理对象like问题
+     *
+     * @param field     对象字段
+     * @param parameter 对象
+     */
+    void resolveObj(String field, Object parameter) {
+        if (parameter == null || StringUtils.isBlank(field)) {
+            return;
+        }
+        try {
+            PropertyDescriptor descriptor = new PropertyDescriptor(field, parameter.getClass());
+            Method readMethod = descriptor.getReadMethod();
+            Object param = readMethod.invoke(parameter);
+            if (this.hasEscapeChar(param)) {
+                Method setMethod = descriptor.getWriteMethod();
+                setMethod.invoke(parameter, this.escapeChar(param.toString()));
+            } else if (this.cascade(field)) {
+                int index = field.indexOf(MYBATIS_PLUS_WRAPPER_SEPARATOR) + 1;
+                this.resolveObj(field.substring(index), param);
+            }
+        } catch (IntrospectionException | IllegalAccessException | InvocationTargetException e) {
+            log.error("反射 {} 的 {} get/set方法出现异常", parameter, field, e);
+        }
+    }
+
+    /**
+     * 判断是否是级联属性
+     *
+     * @param field 字段名
+     * @return true/false
+     */
+    boolean cascade(String field) {
+        if (StringUtils.isBlank(field)) {
+            return false;
+        }
+        return field.contains(MYBATIS_PLUS_WRAPPER_SEPARATOR) && !this.hasWrapper(field);
+    }
+
+    /**
+     * 是否包含mybatis-plus的包含like的SQL语句格式
+     *
+     * @param sql 完整SQL语句
+     * @return true/false
+     */
+    private boolean hasMybatisPlusLikeSql(String sql) {
+        if (StringUtils.isBlank(sql)) {
+            return false;
+        }
+        return sql.toLowerCase().contains(MYBATIS_PLUS_LIKE_SQL);
+    }
+
+    /**
+     * 判断是否使用mybatis-plus条件构造器
+     *
+     * @param field 字段
+     * @return true/false
+     */
+    private boolean hasWrapper(String field) {
+        if (StringUtils.isBlank(field)) {
+            return false;
+        }
+        return field.contains(MYBATIS_PLUS_WRAPPER_PREFIX);
+    }
+
+    /**
+     * 判断字符串是否含有需要转义的字符
+     *
+     * @param str 待判断的字符串
+     * @return true/false
+     */
+    private boolean hasEscapeChar(String str) {
+        if (StringUtils.isBlank(str)) {
+            return false;
+        }
+        for (String s : ESCAPE_CHAR) {
+            if (str.contains(s)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+}

src/main/java/com/diagbot/config/mybatisLike/MapLikeSqlConverter.java

@@ -0,0 +1,79 @@
+package com.diagbot.config.mybatisLike;
+
+import com.baomidou.mybatisplus.core.conditions.AbstractWrapper;
+
+import java.util.Map;
+import java.util.Objects;
+
+/**
+ * @Description: 参数对象为Map的转换器
+ * @author: gaodm
+ * @time: 2020/11/2 16:07
+ */
+public class MapLikeSqlConverter extends AbstractLikeSqlConverter<Map> {
+
+    @Override
+    public void transferWrapper(String field, Map parameter) {
+        AbstractWrapper wrapper = (AbstractWrapper) parameter.get(MYBATIS_PLUS_WRAPPER_KEY);
+        parameter = wrapper.getParamNameValuePairs();
+        String[] keys = field.split(MYBATIS_PLUS_WRAPPER_SEPARATOR_REGEX);
+        // ew.paramNameValuePairs.param1，截取字符串之后，获取第三个，即为参数名
+        String paramName = keys[2];
+        String mapKey = String.format("%s.%s", REPLACED_LIKE_KEYWORD_MARK, paramName);
+        if (parameter.containsKey(mapKey) && Objects.equals(parameter.get(mapKey), true)) {
+            return;
+        }
+        if (this.cascade(field)) {
+            this.resolveCascadeObj(field, parameter);
+        } else {
+            Object param = parameter.get(paramName);
+            if (this.hasEscapeChar(param)) {
+                String paramStr = param.toString();
+                parameter.put(keys[2], String.format("%%%s%%", this.escapeChar(paramStr.substring(1, paramStr.length() - 1))));
+            }
+        }
+        parameter.put(mapKey, true);
+    }
+
+    @Override
+    public void transferSelf(String field, Map parameter) {
+        if (this.cascade(field)) {
+            this.resolveCascadeObj(field, parameter);
+            return;
+        }
+        Object param = parameter.get(field);
+        if (this.hasEscapeChar(param)) {
+            String paramStr = param.toString();
+            parameter.put(field, String.format("%%%s%%", this.escapeChar(paramStr.substring(1, paramStr.length() - 1))));
+        }
+    }
+
+    @Override
+    public void transferSplice(String field, Map parameter) {
+        if (this.cascade(field)) {
+            this.resolveCascadeObj(field, parameter);
+            return;
+        }
+        Object param = parameter.get(field);
+        if (this.hasEscapeChar(param)) {
+            parameter.put(field, this.escapeChar(param.toString()));
+        }
+    }
+
+    /**
+     * 处理级联属性
+     *
+     * @param field     级联字段名
+     * @param parameter 参数Map对象
+     */
+    private void resolveCascadeObj(String field, Map parameter) {
+        int index = field.indexOf(MYBATIS_PLUS_WRAPPER_SEPARATOR);
+        Object param = parameter.get(field.substring(0, index));
+        if (param == null) {
+            return;
+        }
+        this.resolveObj(field.substring(index + 1), param);
+    }
+
+}
+

src/main/java/com/diagbot/config/mybatisLike/MybatisLikeSqlInterceptor.java

@@ -0,0 +1,160 @@
+package com.diagbot.config.mybatisLike;
+
+import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.ibatis.executor.Executor;
+import org.apache.ibatis.mapping.BoundSql;
+import org.apache.ibatis.mapping.MappedStatement;
+import org.apache.ibatis.plugin.Interceptor;
+import org.apache.ibatis.plugin.Intercepts;
+import org.apache.ibatis.plugin.Invocation;
+import org.apache.ibatis.plugin.Plugin;
+import org.apache.ibatis.plugin.Signature;
+import org.apache.ibatis.session.ResultHandler;
+import org.apache.ibatis.session.RowBounds;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Properties;
+import java.util.Set;
+
+/**
+ * @Description: mybatis/mybatis-plus模糊查询语句特殊字符转义拦截器
+ * @author: gaodm
+ * @time: 2020/11/2 16:04
+ */
+@Intercepts({ @Signature(type = Executor.class, method = "query", args = { MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class }) })
+@Slf4j
+public class MybatisLikeSqlInterceptor implements Interceptor {
+
+    /**
+     * SQL语句like
+     */
+    private final static String SQL_LIKE = " like ";
+
+    /**
+     * SQL语句占位符
+     */
+    private final static String SQL_PLACEHOLDER = "?";
+
+    /**
+     * SQL语句占位符分隔
+     */
+    private final static String SQL_PLACEHOLDER_REGEX = "\\?";
+
+    /**
+     * 所有的转义器
+     */
+    private static Map<Class, AbstractLikeSqlConverter> converterMap = new HashMap<>(4);
+
+    static {
+        converterMap.put(Map.class, new MapLikeSqlConverter());
+        converterMap.put(Object.class, new ObjectLikeSqlConverter());
+    }
+
+    @Override
+    public Object intercept(Invocation invocation) throws Throwable {
+        Object[] args = invocation.getArgs();
+        MappedStatement statement = (MappedStatement) args[0];
+        Object parameterObject = args[1];
+        BoundSql boundSql = statement.getBoundSql(parameterObject);
+        String sql = boundSql.getSql();
+        this.transferLikeSql(sql, parameterObject, boundSql);
+        return invocation.proceed();
+    }
+
+    @Override
+    public Object plugin(Object target) {
+        return Plugin.wrap(target, this);
+    }
+
+    @Override
+    public void setProperties(Properties arg0) {
+
+    }
+
+    /**
+     * 修改包含like的SQL语句
+     *
+     * @param sql             SQL语句
+     * @param parameterObject 参数对象
+     * @param boundSql        绑定SQL对象
+     */
+    private void transferLikeSql(String sql, Object parameterObject, BoundSql boundSql) {
+        if (!isEscape(sql)) {
+            return;
+        }
+        sql = sql.replaceAll(" {2}", " ");
+        // 获取关键字的个数（去重）
+        Set<String> fields = this.getKeyFields(sql, boundSql);
+        if (fields == null) {
+            return;
+        }
+        // 此处可以增强,不止是支持Map对象,Map对象仅用于传入的条件为Map或者使用@Param传入的对象被Mybatis转为的Map
+        AbstractLikeSqlConverter converter;
+        // 对关键字进行特殊字符“清洗”，如果有特殊字符的，在特殊字符前添加转义字符（\）
+        if (parameterObject instanceof Map) {
+            converter = converterMap.get(Map.class);
+        } else {
+            converter = converterMap.get(Object.class);
+        }
+        converter.convert(sql, fields, parameterObject);
+    }
+
+    /**
+     * 是否需要转义
+     *
+     * @param sql SQL语句
+     * @return true/false
+     */
+    private boolean isEscape(String sql) {
+        return this.hasLike(sql) && this.hasPlaceholder(sql);
+    }
+
+    /**
+     * 判断SQL语句中是否含有like关键字
+     *
+     * @param str SQL语句
+     * @return true/false
+     */
+    private boolean hasLike(String str) {
+        if (StringUtils.isBlank(str)) {
+            return false;
+        }
+        return str.toLowerCase().contains(SQL_LIKE);
+    }
+
+    /**
+     * 判断SQL语句中是否包含SQL占位符
+     *
+     * @param str SQL语句
+     * @return true/false
+     */
+    private boolean hasPlaceholder(String str) {
+        if (StringUtils.isBlank(str)) {
+            return false;
+        }
+        return str.toLowerCase().contains(SQL_PLACEHOLDER);
+    }
+
+    /**
+     * 获取需要替换的所有字段集合
+     *
+     * @param sql      完整SQL语句
+     * @param boundSql 绑定的SQL对象
+     * @return 字段集合列表
+     */
+    private Set<String> getKeyFields(String sql, BoundSql boundSql) {
+        String[] params = sql.split(SQL_PLACEHOLDER_REGEX);
+        Set<String> fields = new HashSet<>();
+        for (int i = 0; i < params.length; i++) {
+            if (this.hasLike(params[i])) {
+                String field = boundSql.getParameterMappings().get(i).getProperty();
+                fields.add(field);
+            }
+        }
+        return fields;
+    }
+
+}

src/main/java/com/diagbot/config/mybatisLike/ObjectLikeSqlConverter.java

@@ -0,0 +1,28 @@
+package com.diagbot.config.mybatisLike;
+
+import lombok.extern.slf4j.Slf4j;
+
+/**
+ * @Description: 通用参数的转换器
+ * @author: gaodm
+ * @time: 2020/11/2 16:06
+ */
+@Slf4j
+public class ObjectLikeSqlConverter extends AbstractLikeSqlConverter<Object> {
+
+    @Override
+    public void transferWrapper(String field, Object parameter) {
+        // 尚未发现这种情况
+    }
+
+    @Override
+    public void transferSelf(String field, Object parameter) {
+        // 尚未发现这种情况
+    }
+
+    @Override
+    public void transferSplice(String field, Object parameter) {
+        this.resolveObj(field, parameter);
+    }
+
+}