With the development of the computer technology and the Internet

the application of databases is developing rapidly. However

in the field of computer applications where everything is being continuously optimized

upgraded

and integrated

it is hard to reuse data in a heterogeneous environment.This forms information islands. Based on XML

which is the carrier of heterogeneous data for data exchange

adopting the J2EE and Dom4j technology

we solve the problem of data exchange for relational databases in a heterogeneous environment effectively. By guaranteeing integrity

we provide users with a flexible and low overhead method for heterogeneous data management.