MyBatis自定义类型转换器实现加解密

/**自定义typeHandler<br/> 
* 1 插入数据库， 加密 
* 2 查询，解密 
* @author Administrator 
* 
*/ 
public class CryptTypeHandler implements TypeHandler<CryptType> { 
public CryptType getResult(ResultSet rs, String columnName) throws SQLException { 
String value=""; 
CryptType v=new CryptType(value); 
value=rs.getString(columnName); 
if(value!=null){ 
value=decrypt(value.toString()); 
v.setValue(value); 
} 
return v; 
} 
public CryptType getResult(ResultSet rs, int columnIndex) throws SQLException { 
String value=""; 
CryptType v=new CryptType(value); 
value =rs.getString(columnIndex); 
if(value!=null){ 
v.setValue(value); 
} 
return v; 
} 
public CryptType getResult(CallableStatement cs, int columnIndex) throws SQLException { 
String value=""; 
CryptType v=new CryptType(); 
value =cs.getString(columnIndex); 
if(value!=null){ 
v.setValue(value); 
} 
return v; 
} 
public void setParameter(PreparedStatement ps, int i, CryptType parameter, JdbcType arg3) throws SQLException { 
String value=""; 
if(parameter!=null && parameter.toString()!=null){ 
value=encrypt(parameter.toString()); 
} 
ps.setString(i, value.toString()); 
} 
/**插入数据库 
* @param value 
* @return 
*/ 
private String encrypt(String value) { 
value=CryptUtils.encrypt(value); 
return value; 
} 
/** 从数据库读出 
* @param value 
* @return 
*/ 
private String decrypt(String value){ 
value=CryptUtils.decrypt(value); 
return value; 
} 
}

import java.io.Serializable; 
/** 
* 自定义类型 
* 定义为该类型的实体属性会走CryptTypeHandler.java做加解密处理 
* 
* @author yy 
* 
*/ 
public class MyString implements Serializable, CharSequence, Comparable<String>{ 
private static final long serialVersionUID = 1L; 
private String value; 
public MyString (){ 
} 
public CryptType(String value){ 
this.value=value; 
} 
public String getValue() { 
return value; 
} 
public void setValue(String value) { 
this.value = value; 
} 
public int compareTo(String arg0) { 
// TODO Auto-generated method stub 
return 0; 
} 
public char charAt(int arg0) { 
// TODO Auto-generated method stub 
return 0; 
} 
public int length() { 
// TODO Auto-generated method stub 
return 0; 
} 
public CharSequence subSequence(int arg0, int arg1) { 
// TODO Auto-generated method stub 
return null; 
} 
@Override 
public String toString() { 
return value; 
} 
} 

<!-- 自定义类型 --> 
<typeHandlers> 
<typeHandler javaType="com.***.MyString" handler="com.***.MyTypeHandler"/> 
</typeHandlers>

public class LoanEnterprise{ 
private MyString name; 
//注意： 
//如果页面有查询条件也被加密时，mybatis sql中的条件判断会无法匹配，暂时的一种解决办法是在 
public CryptType getName() { 
if(name!=null && name.getValue().equals("")){ 
return null; 
}else { 
return name; 
} 
} 
public void setName(CryptType name) { 
this.name = name; 
} 
}