场景:数据库为mysql该字段的类型blob。
在从数据库读取时是保存内容全部为乱码,最后在网上找到一种好的解决方法。
可以在读出内容后自己写代码去转换
1、写一个转换类,在指定结果类型时给需要转换的字段指定装换类(PS:持久层使用了mybatis)
import java.io.ByteArrayInputStream; import java.io.UnsupportedEncodingException; import java.sql.Blob; import java.sql.CallableStatement; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import org.apache.ibatis.type.BaseTypeHandler; import org.apache.ibatis.type.JdbcType; public class MyBlobTypeHandler extends BaseTypeHandler<String> { //###指定字符集 private static final String DEFAULT_CHARSET = "utf-8"; 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 { Blob blob = (Blob) rs.getBlob(columnName); byte[] returnValue = null; if (null != blob) { returnValue = blob.getBytes(1, (int) blob.length()); } try { //###把byte转化成string return new String(returnValue, DEFAULT_CHARSET); } catch (UnsupportedEncodingException e) { throw new RuntimeException("Blob Encoding Error!"); } } public String getNullableResult(CallableStatement cs, int columnIndex) throws SQLException { Blob blob = (Blob) cs.getBlob(columnIndex); byte[] returnValue = null; if (null != blob) { returnValue = blob.getBytes(1, (int) blob.length()); } try { return new String(returnValue, DEFAULT_CHARSET); } catch (UnsupportedEncodingException e) { throw new RuntimeException("Blob Encoding Error!"); } } @Override public String getNullableResult(ResultSet rs, int columnIndex) throws SQLException { // TODO Auto-generated method stub return null; } }
2、在mybatis配置文件中指定
<result column="settlementContent" property="settlementContent" typeHandler="cn.xxx.utils.MyBlobTypeHandler"/>
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