问题：在mysql中存储base64，因为太长，基本就是几百K，所以用longBlob

描述：在mysql中，LongBlob、blob算是二进制流文件了，所以用普通的数据格式是不行的，这里用TypeHandler解决，有其他觉得方案欢迎在下方留言

解决：

Handler代码

import org.apache.ibatis.type.BaseTypeHandler;import org.apache.ibatis.type.JdbcType;import java.io.ByteArrayInputStream;import java.io.UnsupportedEncodingException;import java.sql.*;public class MyBlobTypeHandler extends BaseTypeHandler
     
       {    // 指定字符集      private static final String DEFAULT_CHARSET = "utf-8";    @Override    public void setNonNullParameter(PreparedStatement ps, int i, String parameter, JdbcType jdbcType) throws SQLException {        ByteArrayInputStream bis;        try {            // 把String转化成byte流              bis = new ByteArrayInputStream(parameter.getBytes(DEFAULT_CHARSET));        } catch (UnsupportedEncodingException e) {            throw new RuntimeException("Blob Encoding Error!");        }        ps.setBinaryStream(i, bis, parameter.length());    }    @Override    public String getNullableResult(ResultSet rs, String columnName) throws SQLException {        return getResult(rs.getBlob(columnName));    }    @Override    public String getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {        return getResult(cs.getBlob(columnIndex));    }    @Override    public String getNullableResult(ResultSet rs, int columnName) throws SQLException {        return getResult(rs.getBlob(columnName));    }    private String getResult(Blob blob) throws SQLException {        byte[] returnValue = null;        if (null != blob) {            returnValue = blob.getBytes(1, (int) blob.length());        }        try {            // 把byte转化成string            if (null != returnValue) {                return new String(returnValue, DEFAULT_CHARSET);            }        } catch (UnsupportedEncodingException e) {            throw new RuntimeException("Blob Encoding Error!");        }        return null;    }}
     

mybatis XML代码